The Kynix Components

CR2016 batteries and CR2025 batteries that are round, flat, and look like small silver buttons seem to look the same. Since they all look the same, can they be used universally? This article will answer your questions and show you theirs similarities and differences in some aspects, as well as the interchangeability. CatalogWhat is a CR2016 Battery?What is a CR2025 Battery?CR2016 vs CR2025 FeaturesCR2016 vs CR2025 CapacityCR2016 vs CR2025 VoltageCR2016 vs CR2025 ThicknessCR2016 vs CR2025 RechargeabilityCR2016 vs CR2025 DimensionsCR2016 vs CR2025 Temperature CharacteristicsCR2016 vs CR2025 ApplicationsEquivalents for CR2016 vs CR2025CR2016 vs CR2025 Spec ComparisonCR2016 vs CR2025 InterchangeabilityProduct ManufacturerProduct DatasheetUsing WarningsCR2016 vs CR2025 FAQ What is a CR2016 Battery?The CR2016 is a battery that is useful in many small electronic devices. It works well as a replacement for many brands of watches, along with providing high energy for calculators, PDA devices, medical devices, toys, and more. What is a CR2025 Battery?CR2025 is a coin cell battery. Coin cell batteries like CR2025 have many uses, they are usually used for small portable electronics devices. They are generally of a compact size, 5-25mm in diameter and 1-6mm in height. The name defines the size of the battery as for CR2025, the first two digits are for the diameter and the second for the height or thickness of tenths of mm. Therefore, 20mm is the diameter of CR2025, and 2.5mm is the thickness. CR2016 vs CR2025 FeaturesLightweight, High Voltage and High Energy DensityThe battery voltage is 3V, almost double that of normal alkaline or manganese batteries. This means that the number of batteries required for equipment can be halved for maximum space saving and weight reduction. Excellent Discharge CharacteristicsVoltage characteristics remain stable even for a long period of discharge, greatly improving the reliability of equipment that uses the battery. Such equipment is also maintenance-free (battery replacement is seldom required). Excellent Leakage Resistance The newly developed battery construction and electrolyte ensure maximum leakage resistance over a long span of time. Excellent Long-Term ReliabilityCarefully selected active materials are used for the active material as well as for the electrolyte. These materials are sealed by innovative technology to minimize battery self-discharge. The annual self-discharge rate at room temperature and normal humidity is less than 1% of the nominal capacity. UL Approved PartsCoin Manganese Dioxide Lithium Batteries are approved by UL. (UL1642 File No. MH12566) RoHS Directive / European Directives This product does not contain Mercury(Hg), Cadmium(Cd), nor Lead(Pb), and conforms to EC regulation values. (Directive 2006/66/EC, 2013/56/EU)Battery pack are excluded from RoHS directive (DIRECTIVE 2011/65/EU OF THE EU ROPEAN PARLIAMENT AND OF THE COUNCIL of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment). CR2016 vs CR2025 CapacityThe capacity of a button or coin cell battery indicates the number of charges the coin battery can hold. The higher the capacity of the button battery, the longer the battery will last. The capacity of the battery is dependent on the amount of active material in the button cell. CR2025The CR2025 has a capacity of 165 mAh. This figure is a measure of electric power over time. Most portable electronic devices that use this type of battery require very little electrical power to work. So assuming you’re using this battery on a device that requires 5mA, this battery will last for over 33 hours, that’s over one and a half days. CR2016The CR2016 has a battery capacity of 90 mAh . When you make use of this battery on a device that requires 5 mAh, the battery will last for 18 hours, so less than a day. CR2016 vs CR2025 VoltageThe voltage of a battery simply means how much potential is in the battery. But don’t confuse the voltage of a button battery to mean the measure of energy. CR2025The CR2025 battery has a potential of 3 V. CR2016The CR2016 battery has a potential of 3 V. CR2016 vs CR2025 ThicknessWhat differentiates most button batteries is their thickness or diameter. For a typical CR series battery, you can get the thickness of the battery from the last two digits of the name in a tenth of a millimeter. CR2025The CR2025 battery has a thickness of 2.5 mm. CR2016The Thickness of a CR2016 battery is 1.6 mm. CR2016 vs CR2025 RechargeabilityRecharging a battery is achieved by reversing the flow of current through the cell. CR2016 and CR2025 are both disposable batteries and not a rechargeable battery. CR2016 vs CR2025 DimensionsFollowing shows the diagrams of CR1632 and CR2032  dimensions. CR2016 Dimensions CR2025 Dimensions CR2016 vs CR2025 Temperature CharacteristicsFollowing shows the diagrams of temperature characteristics. CR2016 Temperature Characteristics CR2025 Temperature Characteristics CR2016 vs CR2025 ApplicationsCR2016ApplicationsYou can use these batteries in calculators, digital watches, memory back-up, laser pens, car keys, fitness appliances and medical devices like a clinical thermometer and a tensiometer. Lithium Coin CR2016  has a proven track record for appliances where conventional batteries cannot be used. CR2025ApplicationsFor devices where traditional batteries cannot be used, LITHIUM COIN CR2025  has a proven track record. These batteries are useful for memory back-up, digital watches, calculators, car keys, fitness appliances, laser pens and medical devices like a tensiometer and a clinical thermometer. Equivalents for CR2016 vs CR2025CR2016 Equivalent BatteriesBR2016, CR2016, DL2016, ECR2016, KCR2016, KECR2016, KL2016, and L2016 batteries CR2025 Equivalent BatteriesDL2025 (Duracell), ECR2025 (Energizer), CR2025 (Kodak, Maxell , Rayovac, Sony ) CR2016 vs CR2025 Spec ComparisonProduct codeCR-2025ELCR-2016ELSizeCR2025CR2016TechnologyLithiumLithiumVoltage3V3VDiameter20 mm20 mmWeight2,6 g1,7 gShelf Life10 years10 years CR2016 vs CR2025 InterchangeabilityBoth batteries have the same 20mm diameter and are 3V, so in theory, they are interchangeable. However, they have different thicknesses. The CR2016 is 1.6 mm thick and the CR2025 is 2.5 mm thick. The increased thickness of the CR2025 would prevent it from seating properly and therefore would not be a suitable replacement. Product ManufacturerPanasonic is a leading supplier of batteries offering advanced cell manufacturing and product technologies, superior quality, and one of the broadest lines of primary and rechargeable batteries in the industry. Panasonic's product line includes Lithium coin, Lithium primary cylindrical, Nickel Metal Hydride,  Valve Regulated Lead Acid and Alkaline batteries. Product DatasheetCR2016 DatasheetCR2025 Datasheet Using Warnings(1) Keep out of reach of children. Swallowing may lead to serious injury or death in as little as 2 hours due to chemical burns and potential perforation of the oesophagus. If swallowed, immediately go to a hospital emergency room. Keep in original package until ready to use. Dispose of used batteries immediately.(2) Risk of injury due to fire, explosion or leakage. Do not disassemble, charge, crush or expose to fire or high temperatures. CR2016 vs CR2025 FAQWhat Brand Makes the Best Cr2016 Battery?Now that you understand the features and characteristics of the Cr2016 battery, you might want to stock up for some of your portable devices. Some brands are highly recommended if you need this type of button cell battery. These brands include; Duracell, Energizer, Maxwell, Panasonic, Varta, etc. Each of them promises temperature-resistance with continuous voltage over toys, PDA and Medical Devices. Depending on the brand, the Cr2016 battery lasts between 2 to 3 months. What Brand Makes the Best Cr2025 Battery?If you also need a button cell battery that can withstand excessive temperatures, especially the Cr2025, it shouldn’t be a big deal. A few brands have contributed to small LED lights with this battery, and invested much in packaging design; therefore, it would be great to patronize them. These brands include Duracell, Chao Chuang, Philips Lithium Minicell, GloFX Lithium Button, etc. Depending on the brand, the battery often lasts between 4 to 6 months. Can You Replace Cr2016 with Cr2025 and Vice-Versa?If you are thinking of replacing Cr2016 with Cr2025, it is possible but it has a lower charge compared to the other. On the other hand, the Cr2025 battery has a higher charge and lasts longer as a replacement. On several occasions, it has been confirmed that Cr2016 and Cr2032 can replace the Cr2025 battery. However, when you are trying to do this, you might encounter space limitations. The watch or device involved might not have the space to hold the battery due to its diameter or thickness – Cr2016 is 1.6mm thick, while Cr2025 is 2.5mm thick. What are CR2016 batteries used for?CR2016 lithium coin cell batteries provide excellent performance and their extensive shelf-life makes them ideal for use in a variety of devices: Watch, clock, toys, calculator, RTC (Real Time Clock), memory back-Up power source, keyless entry remotes and remote starters. Is CR2025 the same as CR2032?The obvious difference between the two battery types would be thickness. The CR2032 is 3.2mm thick while the CR2025 is 2.5mm thick. Because the CR2032 is 0.7mm thicker than the CR2025, it has a higher capacity (mAh) to deliver current to the load.

CD4543, a very convenient and easy-to-use 7-segment latch/decoder/driver chip. Where is the CD4543 chip generally used? Maybe you can see the incandescent lamp overhead by looking up. Yes, in our daily life, CD4543 is often used to drive various light-emitting or display items, such as Light-Emitting Diodes (LED), incandescent, gas-discharge, and fluorescent displays. If you are interested in this kind of tiny chip that can bring convenience to our vision, then this blog can give you a better understanding of it.CatalogCD4543 PinoutCD4543 Truth TableCD4543 AdvantagesCD4543 FeaturesCD4543 ApplicationsCD4543 CAD CAE SymbolsCD4543 PackageCD4543 Logic Circuit DiagramCD4543 ParametersCD4543 ManufacturerComponent DatasheetOrdering & QuantityCD4543 Pinout CD4543 Truth Table It can be seen from the truth table that A, B, C, and D are four-digit BCD code input pins. And a, b, c, d, e, f, g are the position codes of the seven segments displayed by seven-segment characters. When BI (Blanking) is 1 (high level), the output is no display state.When BI is 1, LD is 0, the display will not change.When BI is 1, LD is 1, the seven-segment code display output changes according to the BCD code input. At this time, if the DCBA is a code input of 0-9, the output will display 0-9 respectively. If the DCBA is a code input of 10-15, the output will not display. Pin 9 (VDD) and Pin 8 (Vss) are power + and power ground.CD4543 AdvantagesCD4543B differs from the CD4056B in that it has a display blanking capability instead of a level-shifting function and requires only one power supply. When the CD4056B is used in the level shifting mode, two power supplies are required. When the CD4543B is used for LCD applications, a square wave must be applied to the PHASE input and the backplane of the LCD device. For LED applications a logic 1 is required at the PHASE input for common-cathode devices; a logic 0 is required for common-anode devices (see truth table). The CD4543B is supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (M, M96, MT, and NSR suffixes), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).CD4543 FeaturesDisplay blanking of all illegal input combinationsLatch storage of codeCapability of driving two low power TTL loads, two HTL loads, or one low power Schottky load over the full rated-temperature rangePin-for-pin replacement for the CD4056B (with pin 7 tied to VSS)Direct LED driving capability100% tested for quiescent current at 20 VMaximum input current of 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°CNoise margin (full package-temperature range) = 1 V at VDD = 5 V 2 V at VDD = 10 V 2.5 V at VDD = 15 V 5-V, 10-V, and 15-V parametric ratings Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of ’B’ Series CMOS Devices"CD4543 ApplicationsInstrument display driverDashboard display driverComputer/calculator display driverTiming device driver (clocks, watches, timers)CD4543 CAD CAE SymbolsPackagePinsDownloadPDIP (N)16View optionsSO (NS)16View optionsSOIC (D)16View optionsTSSOP (PW)16View optionsCD4543 PackagePDIP (N)16181 mm²19.3 x 9.4SOIC (D)1659 mm²9.9 x 6SOP (NS)1680 mm²10.2 x 7.8TSSOP (PW)1622 mm²4.4 x 5CD4543 Logic Circuit DiagramCD4543 ParametersBits (#)7Channels (#)4Configuration4:7Digital input leakage (Max) (uA)5ESD CDM (kV)0.75ESD HBM (kV)2F @ nom voltage (Max) (MHz)8FunctionDecoder, DemultiplexerICC @ nom voltage (Max) (mA)0.3IOH (Max) (mA)-1.5IOL (Max) (mA)1.5Operating temperature range (C)-55 to 125Product typeStandardRatingCatalogTechnology FamilyCD4000tpd @ nom Voltage (Max) (ns)400VCC (Max) (V)18VCC (Min) (V)3Voltage (Nom) (V)5, 10, 15CD4543 ManufacturerTexas Instruments Inc. (TI)  is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments's focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.Component DatasheetCD4543 Datasheet

I IntroductionThe LM311 devices are single high-speed voltage comparators. The devices are designed to operate from a wide range of power supply voltages, including ±15-V supplies for operational amplifiers and 5-V supplies for logic systems. The output levels are compatible with most TTL and MOS circuits. These comparators are capable of driving lamps or relays and switching voltages up to 50 V at 50 mA. All inputs and outputs can be isolated from the system ground. The outputs can drive loads referenced to ground, VCC+ or VCC−. Offset balancing and strobe capabilities are available, and the outputs can be wire-OR connected. If the strobe is low, the output is in the off state, regardless of the differential input.CatalogI IntroductionII Precautions of LM3112.1 Choose Components Reasonably2.2 Increase Amplitude of Input Signal2.3 Add Filtering Appliances to Output of Comparator2.4 Adopt Lagging TechnologyFAQOrdering & QuantityII Precautions of LM311LM311 is a commonly used linear comparator, which is widely used in comparison and shaping circuits, as is shown in Figure 1. Figure 1. LM311 Circuit DiagramHowever, LM311 often has unexpected problems in the application, that is, the output pulse signal is not as ideal as theoretical analysis. Instead, high-frequency oscillation occurs near the front and back edges of the output pulse, as shown in Figures 2 and 3. Figure 2. High Frequency Oscillation before Output Pulse Figure 3. High Frequency Oscillation after Output PulseWhen the input signal Vi amplitude of the LM311 is smaller and the frequency is lower, the high-frequency oscillation is more serious. This kind of waveform containing high-frequency oscillation cannot be used directly. It will cause misoperation to subsequent circuits, such as frequency measurement. Therefore, this situation must be paid attention to, and try to avoid or eliminate the high-frequency oscillation. The following will give a brief analysis of the causes of oscillations, and at the same time put forward several methods to effectively avoid eliminating oscillations on the basis of experiments.Figure 4. LM311When a high-speed comparator is used for high-speed input signals and low source impedance input signals, the normal output response should be fast and stable. However, when the input signal is a slowly varying signal or a high-impedance signal source (1.0KΩ-10KΩ), the comparator may oscillate suddenly at the comparison threshold point, which is caused by the high gain and wideband of the comparator, and the presence of interference is also one of the direct causes of this oscillation. In application, to avoid this kind of oscillation and instability, careful consideration should be made in advance and overall arrangements should be made. The following will propose several effective methods to avoid and overcome oscillations:2.1 Choose Components ReasonablyReasonably arranging the occurrence of structural oscillations has a lot to do with structural arrangements. The output signal should be far away from the input terminal pin, and should also be far away from the two balanced terminal pins, because the feedback signal sensing or touching any pin may almost cause oscillation. If the comparator uses a resistor at the input, its position and resistance are worth considering. The resistance should be placed near the tube base, and the general resistance value should be less than 10K (or even less), please refer to the corresponding manual when using. The positive and negative power supply should add 0.1μ filter capacitor to filter out the interference of the power supply, and put the capacitor near the pin. The two balanced ends should be properly handled. When not in use, they can be shorted together. For specific use, you can also refer to the relevant manual.2.2 Increase Amplitude of Input SignalThe magnitude of the input signal amplitude is directly related to the oscillation. Experiments show that the smaller the signal amplitude, the lower the frequency, the greater the possibility of oscillation. The following will make a simple analysis of the above conclusions. If there is a zero-crossing comparator, the input signal is Vi=V0sinω0t. The slope of the signal at t=0 is:The amount of voltage change in △t time is: △Vi=K·△t=V0sinω0t, which shows that △Vi is proportional to V0,ω0, that is, the greater the amplitude of the input signal, the higher the frequency of the signal. Then in the △t time, the longer the amplitude change of V is, when dvi/dt is large enough, the input signal will quickly cross the comparison threshold, so as to achieve the purpose of eliminating oscillation. Because the input voltage range of the comparator is generally relatively wide (for example: the voltage input range of the LM311 is ±30V), this method is the most simple and feasible. The experiment proves that as long as the amplitude of the input signal is greater than 0.7V, this design can work reliably in the range of 10Hz ~ 60KHz, continue to increase the voltage amplitude, the working range can be extended to the low frequency end.2.3 Add Filtering Appliances to Output of ComparatorPulling a resistor at the output of the comparator and connecting a capacitor with an appropriate capacity has a significant effect on filtering and reducing oscillation. The capacity of the capacitor should be determined on the basis of the experiment. The capacity of the capacitor should not be too large, otherwise the leading edge of the output pulse will be deteriorated. It was found in the experiment that this negative effect is particularly serious at higher frequencies, and even make the pulse amplitude smaller, so that the counter of the subsequent stage can not work, the situation is shown in Figure 5. Figure 5. Pulse Amplitude at Higher FrequenciesTherefore, this method has certain limitations in the application, and the reasonable choice of capacitance is the key to applying this method. Of course, the deteriorated front can be restored by the 74LS14 with a shaping effect. The negative effect of this method is to shift the original pulse front backward. In this design, capacitance C=0.01μ is taken. Within the range required by the system, the value of the pull-up resistor that the circuit can work reliably cannot be too large. In this design, R=510Ω.2.4 Adopt Lagging TechnologyIn the comparison circuit, when the input signal reaches the comparison level, the comparator should be reversed immediately, but if the measured signal is superimposed with a certain amount of interference, the comparator may oscillate near the comparison level, as shown in the following figure (Figure 6-7).Figure 6. Output of a Common Zero-crossing ComparatorFigure 7. Output with Lag TechnologyThe effective method to overcome the oscillation of the comparator is to use the lag technology, that is, add a small amount of positive feedback to its non-inverting end. The comparison level of the lag comparator is no longer a single level, but has two power levels near the original comparison level. In general, for the circuit in figure 8, the upper comparison level is represented by V+H, and the lower comparison level is represented by V+L.Figure 8. Circuit with Two LevelsThe hysteresis voltage can be adjusted by R1 and R2. As long as △V is selected properly, the oscillation phenomenon of the comparison circuit can be eliminated. Therefore, the anti-interference ability is greatly improved, but the presence of the lag level △V will make the detection sensitivity worse. Therefore, △V should not be too large, usually R1≤R2. For the LM311 comparator, adding 3mv of hysteresis will eliminate the oscillation in the circuit.Therefore, we must consider carefully and treat separately when using LM311. Only in this way can we be handy when using it.FAQWhat are the LM311 devices?Single high-speed voltage comparatorsWhat are the LM311 devices capable of?Driving lamps or relays and switching voltages up to 50 V at 50 mAWhat are available in the LM311 devices?Offset balancing and strobe capabilitiesHow to use LM311?LM311 is a single-channel comparator. When using it, connect the reference voltage and the compared signal voltage to its non-inverting and inverting input terminals (pin 2 and pin 3), and its output is the result of the comparison. If you want the foward output result, pin 7 is connected to the positive power supply and pin 1 is the output. If the result is to be output in reverse, pin 1 is grounded and pin 7 is the open collector output.lm311 and lm393 are both voltage comparators, so what is the difference between them?LM311 is single voltage comparaotor, LM393 is dual voltage copatpr. LM311 has a load current of up to 50MA and a voltage of 40V. It can drive relays with a minimum power supply voltage of 5V.The LM393 load current is 16MA, and the minimum voltage is 2V for a single power supply.What’s the difference between LM311 and LM111?Their functions are the same, and the 1XX series can be used in harsher environments.The 3XX series can only be used in a commercial environment, typically the applicable temperature range of the device.The price of 1xx is much more expensive than 3xx.What does the 5 and 6-pin balance strobes of LM311 mean?The function of balancing the mirror current of the reverse circuit is realized by connecting a potentiometer in the middle. In addition to the balance function, the 6 pin also has a strobe function, and the 6 pin can be grounded through the transistor drive circuit for strobe output.What is the difference between lm311 voltage comparator dual power supply and single power supply?The comparators are all open-collector outputs, without load resistance, they cannot output voltage signals.Dual power supplies can detect signals lower than 0, and single power supplies can only detect signals higher than 0.Can the lm311 comparator be powered by a positive and negative five-volt dual power supply?Of course, LM311 can be powered by ±5V dual power supply. Its requirement for working power supply is that the voltage difference between the positive and negative power supply (or single power supply voltage) is at least 3.5V and the maximum is 30V, as long as it is within this range.

PC817 is an optocoupler. This blog covers PC817 Optocoupler pinout, datasheet, equivalent, features, and other information on how to use and where to use this device.CatalogPC817 PinoutPC817 CircuitPC817 ApplicationsPC817 FeaturesPC817 AdvantagePC817 PackagePC817 ManufacturerPC817 AlternativesPC817 EquivalentsWhere to use PC817How to use PC817How to Safely Long Run PC817 in CircuitPC817 Popularity by RegionPC817 Market Price AnalysisComponent DatasheetFAQPC817 PinoutPin NumberPin NameDescription1AnodeAnode pin of the IR LED. Connected to logic input2CathodeCathode pin of the IR LED. Connected to ground3EmitterEmitter pin of transistor. Connected to Ground4CollectorCollector pin of the Transistor. Provides logical outputPC817 CircuitCircuit DiagramThe circuit design is given below.The circuit is totally simple but the resistance will give it protection at the input in HIGH voltages. The Optocoupler is just a small-sized circuit of infrared receiver and sender but in case of making it with externally by using IR sender and receiver cause many problems.First manually made circuit comes in a larger size, then in case of IR receiving devices the circuit IR sender of auto coupler or receiver could be affected by other IR signals.The closed communication protects it from many things especially from temperature too.The manually made Optocoupler has low voltage operating voltage level as compare to this PC817.Test Circuit for Response TimeTest Circuit for Frequency ResponsePC817 ApplicationsIn protection like electric isolation, PC817 is reliable to use due to its functionality.PC817 is much efficient in switching for microcontrollers. Simple transistors can be used but due to its neglecting the noise factor the optocoupler can be used as switching too.In signal Isolation, the optocoupler is faster and widely used from the previous century.Optocoupler is also used for a basic noise coupling circuit to keep the circuit in use without any disconnectivity.Nowadays IC has the best uses in IoT devices for switching and zero cross. In-Home appliance to control AC load optocoupler gives the pulse of change in frequency which gives the ability to control the AC load at a specific range.For Signal transmission the optocoupler is widely used nowadays.PC817 FeaturesIt comes with 4-pins in two packages, DIP and SMT.The device has an internal protection form of electrical isolation. The protection is for both input and output. It can protect up to HIGH 5KV from electric isolation.The optocoupler can be used with an external resistor with high voltage devices to operate with low voltage devices.The optocoupler can operate with any kind of device with internal interfaces like with TTL device, Microcontrollers and even with HIGH DC voltage with some internal resistors.Optocoupler PC817 comes with internal protection from reverse current. Due to the one-way current flow nature of IR, the PC817 protects the IR from any reverse current.PC817 AdvantagePC817 OptocouplerPC817 is also known as an optocoupler / optoisolator. It consists of Infrared Emitting Diode (IRED). This IRED is coupled to a photo transistor optically and not electrically. It is closed in a four (4) pin package. This package is usually available in two different forms. The first one is wide lead (Pb) spacing option and the second one is SMT gullwing lead form option.PC817 has an internal LED and a photo transistor. The photo transistor's base becomes activate when LED throws light on it. The output obtained can be divided into two formats either common emitter or common collector. But the configuration is mostly common emitter. If the LED does not glow, transistor remains off and hence there will b no output generated by the optocoupler i.e. PC817. PC817 has different feature, e.g. double transfer mold package, current transfer ratio, different CTR ranks available, RoHS comliant, lead (Pb) free etc. Its real-life application includes noise suppression in switching circuits, programmable controllers, signal transmission between circuits having different voltages, signal transmission between different impedance etc.PC817 PackageThrough-Hole [ex.PC817X]SMT Gullwing Lead-Form [ex.PC817XI]Wide Through-Hole Lead-Form [ex.PC817XF]Wide SMT Gullwing Lead-Form [ex.PC817XFP]PC817 ManufacturerSharp Microelectronics of the Americas (SMA) drives innovative LCD, optoelectronics, memory, imager, and RF components to market. The world's leading manufacturers of consumer and business technologies look to SMA for the products, expertise, and worldwide support they need to make their visions a reality. SMA, in Camas, Washington, is the microelectronics sales and marketing division of Sharp Electronics Corporation, a wholly owned subsidiary of Sharp Corporation.PC817 AlternativesThese are the alternative options: 4N25, 6N136, MOC3021, MOC3041, 6N137PC817 EquivalentsThe replacement and equivalent of PC817 optocoupler are PC816, PC123, TLP621, TLP321, TLP421, PC17K1, H11A817, SFH615A, PS2501-1, PS2561-1, PS2571-1, LTV-816, LTV-817(-V), LTV123, LTV-610 K1010, K817P, SFH615AWhere to use PC817If you are going to design an electronic circuit in which there is a chance of voltage spikes or voltage surge which may weak or destroy the components or the circuit then you can use the PC817 optocoupler to isolate the circuit. Moreover it can also be used to remove noise from an electronic signal, isolate DC and low voltage circuits from AC and high voltage circuits. You can also use it where you want to control larger voltage or AC voltage from small any small signal which can be a digital signal or analog.How to use PC817Using PC817 optocoupler is easy, there are four pins shown in the above pinout details. The pin 1 is anode or positive pin of the IR LED should be connected from the output signal of your circuit and pin2 should be connected to the ground. The other part of the circuit which you want to isolate or controlled should be connected with the pin3 (Emitter of the photo transistor) and pin4 (Collector of the photo transistor). The pin3 and pin4 works same as any other normal transistor for example a BJT transistor’s emitter and collector.How to Safely Long Run PC817 in CircuitTo safely long run PC817 optocoupler in your circuit is recommended to always stay below the absolute maximum ratings. Do not drive load more than 50mA, The internal IR LED can be derived same as you drive any other normal LED with a current limiting resistor therefore always use a current limiting resistor at the pin1 of optocoupler which is the IR LED anode or positive pin. Do not operate the device in temperature below -30 centigrade and above 100 centigrade and always store in temperature above -55 centigrade and below 125 centigrade.PC817 Popularity by RegionPC817 Market Price AnalysisComponent DatasheetPC817 DatasheetFAQWhat is PC 817?PC817 is also known as an optocoupler / optoisolator. It consists of Infrared Emitting Diode (IRED). This IRED is coupled to a photo transistor optically and not electrically. It is closed in a four (4) pin package. This package is usually available in two different forms.Why is Optocoupler Used?When used correctly, an Optocoupler can effectively: Remove electrical noise from signals. Isolate low-voltage devices from high-voltage circuits. Allow you to use small digital signals to control larger AC voltages.What is a PC817 Pinout?PC817 Pinout consists of four (4) pins in total, first two are connected with the Infrared Emitting Diode (IRED) while the last two are connected with Photo Transistor.How Does PC817 Work?In PC817 photoisolator IC circuit, the IR receives the noisy signal as a power from the one circuit and passes it to the other part through the IR signal. The other part receives the signal and then performs according to the circuit design.　

IntroductionIn recent years, with the continuous development of new technologies, storage batteries as a power source not only play an important role in transportation (railroad, subway, ship), power generation, communications, aerospace, chemical, traditional automobiles, and other industries. In addition, batteries have also begun to be used in the fields of electric vehicles (EV) and hybrid electric vehicles (HEV) as power sources or power auxiliary power sources.  Do you know what are 2 features of batteries compared with disposable rechargeable batteries? That is multiple recycling and high efficiency and energy saving. When the car is not started, it must rely on the battery to supply power to the starter until it drives the engine to rotate. When the battery voltage is insufficient or the battery is damaged, it is difficult to provide sufficient power, thus causing the engine to fail to run. Therefore, this blog proposes the design of a low-battery alarm system for car batteries based on LM741. In general, when the battery voltage drops to a certain limit, it will send out a reminder. The principle of the reminder is that the circuit judges whether the battery is working normally by installing a sound and light signal alarm system. In this way, we can recharge our car or replace the battery in time.CatalogIntroductionCatalogI Description of LM741II Design of the SystemIII Circuit Design3.1 System Hardware Circuit Design3.2 Reference Power Supply Circuit3.3 Sampling Circuit3.4 Output Circuit3.5 Alarm Principle3.6 Wiring Diagram of the SystemIV Test Results of the SystemFAQOrdering & QuantityI Description of LM741The LM741 series are general-purpose operational amplifiers. It is intended for a wide range of analogue applications. The high gain and wide range of operating voltage provide superior performance in integrator, summing amplifier, and general feedback applications.LM741 has both inverting inputs and non-inverting inputs. When the voltage of the non-inverting input (+) is higher than the voltage of the inverting input (-), the output of the comparator is high. If the voltage at the inverting input (-) is higher than the non-inverting terminal (+), the output is low. The output of the operational amplifier is the product of gain and input voltage.II Design of the SystemThe low battery alarm system is mainly composed of a reference power supply circuit, a sampling circuit, a voltage comparator circuit, and output circuit. The reference power supply circuit consists of a voltage regulator and a current limiting resistor, which is added to the inverting input of the voltage comparator and provides a reference voltage for it. The sampling circuit is composed of two resistors in series to form a series voltage divider, which is used as the input signal of the whole circuit, and a part of the battery voltage is compared with the reference voltage. The voltage comparator circuit judges whether the output is high level or low level by comparing the voltage of the reference power supply circuit and the voltage of the sampling circuit. The output circuit judges whether the light-emitting diode is in the conducting state by the received output voltage from the voltage comparator, thereby giving an alarm signal to indicate the battery power is too low.Figure 1. Structure of the SystemIII Circuit Design3.1 System Hardware Circuit DesignThe hardware circuit of the low battery alarm system is shown in Figure 2. The system mainly includes voltage comparator LM741, resistor, voltage regulator, and LED.Figure 2. Hardware Circuit3.2 Reference Power Supply CircuitThe reference power supply circuit consists of current limiting resistor R2 and voltage regulator VDZ. This system takes the stable voltage of the regulator as the reference voltage of the comparator LM741, and connects it to the inverting input of the LM741. R2 = 100k Ω. The stable voltage is 5V.3.3 Sampling CircuitR1 and R3 are connected in series to form a sampling circuit, which is connected to the in-phase input terminal of LM741. The resistance values of R1 and R3 are equal, taking 100k Ω to form a series partial voltage. The intermediate point is the sampling voltage, that is, taking part of the battery voltage as the detection voltage, i.e. the input voltage.3.4 Output CircuitThe output circuit consists of R4 and LED. R4 = 1K Ω, which can limit the current. According to the voltage value at the output of the voltage comparator to determined whether the LED is on or off.3.5 Alarm PrincipleWhen the battery voltage is higher than 10V, that is, the voltage of sampling circuit exceeds 5V, the input signal voltage is higher than the reference voltage, then LM741 outputs high level, and the output voltage is battery voltage (10 ~ 12V). It can be seen from Figure 4 that the potential of pin 6 is higher than the potential of pin 7. LED do not emit light because of the reverse voltage. This indicates that the battery voltage is normal and the alarm function is not activated. When the battery voltage is lower than 10V and the input signal voltage (<5V) is lower than the reference voltage, the LM741 outputs a low level, that is, the output voltage is zero. At this time, the potential of pin 7 is higher than the potential of pin 6, the LED is turned on due to the forward voltage. And the light indicates that the battery power is too low. The alarm function is activated.3.6 Wiring Diagram of the System Figure 3 shows the wiring structure of low battery alarm system. The automobile battery is connected to the voltage comparison device through the car key switch, and provides power for the automobile circuit load (lighting system, instrument system, etc.) When the battery voltage is normal, the load voltage is normal. And the vehicle can start normally. The instrument system can display and work normally. When the battery voltage is too low, the voltage comparison device will send out a light alarm signal. At the same time, if the power supply voltage can not reach the required voltage level of the system, the corresponding lighting, instrument and other systems will not operate.Figure 3. Wiring Diagram of the SystemIV Test Results of the SystemIt can be seen from table 1 that when the battery voltage is lower than 10V, the alarm indicator is on; when the battery voltage is higher than 10V, the alarm indicator is off. Therefore, the circuit can give an alarm when the battery voltage is lower than 10V, and stop when the battery is recharged to above 10V again. The alarm system does not work when the output voltage of the battery is above 10V. It fully shows that the design scheme of the circuit is correct and feasible.Test Results of the SystemBattery voltage（V）Battery voltage statusAlarm indicator status6.8too lowon8.1lowon9.6lowon10.3 (After charging)normaloff12.8 (After charging)normaloff13.6 (After charging)too hightoffFAQWhat is lm741 op amp?An LM741 operational amplifier is a DC-coupled high gain electronic voltage amplifier. It has only one op-amp inside. An operational amplifier IC is used as a comparator which compares the two signal, the inverting and non-inverting signal.Why Opamp is called 741?The 741 Op Amp IC is a monolithic integrated circuit, comprising of a general purpose Operational Amplifier. It was first manufactured by Fairchild semiconductors in the year 1963. The number 741 indicates that this operational amplifier IC has 7 functional pins, 4 pins capable of taking input and 1 output pin.How does a 741 op amp work?The most common Op-Amp is the 741 and it is used in many circuits. The OP AMP is a 'Linear Amplifier' with an amazing variety of uses. Its main purpose is to amplify (increase) a weak signal - a little like a Darlington Pair. The OP-AMP has two inputs, INVERTING ( - ) and NON-INVERTING (+), and one output at pin 6.How do you calculate lm386 gain?Voltage Gain Analysis:Without any external components, it has a gain of Gv = 2x15K/(150+1350) = 20 (26 dB).With a capacitor (or shortcutting) between pins 1 and 8 , it has a gain of Gv = 2x15K/150 =200 (46dB).Why does the IC 741 require dual power supply?Operational amplifiers have two power supply rails because they usually need to swing bipolar - output voltages that go either positive or negative in response to the normal range of input signals. ... Without the dual supplies the output signal would clip at the ground potential.How do I check my 741 IC?Testing a 741 ICThe circuit is commonly called as voltage follower. A voltage is applied to pin3 of the op-amp through the variable resistor (10K). All we need to do is to verify whether the voltages V1 and V2 are exactly same or not. Check them using a multi-meter.What is IC 741?An op amp is a complex electronic device, which consists of resistors, capacitors, transistors and diodes. It is commercially available in integrated circuit form. Most commonly available and used op amp IC is IC 741. The IC 741 is a small chip. It comprises eight pins.What is gain bandwidth product of 741?Gain-Bandwidth Product: For an Op-Amp the gain, G is defined as the gain when a signal is fed differentially into the op-amp and no feedback loop is present. ... It is generally given in V/μs, and for the 741 op-amp is something close to 1v/μs.What are the features of IC 741?Short circuit and overload protection provided.In theory, the dc output voltage will be zero if both the inputs of the 741 IC are connected to the ground. …Low power consumption.Large common mode rejection ratio (CMRR) and differential voltage ranges.No external frequency compensation is required.Which op-amp (LM356 or LM741) is the better choice for higher frequency applications?Um, the LM356 is an audio power amplifier with a 300 KHz bandwidth. The LM741 is an operational amplifier with a typical unity gain bandwidth of 1 MHz.In other words, they are entirely different sorts of things and not at all interchangeable.Neither is very good at higher frequencies.You might be thinking of the LF356, which is a JFET input operational amplifier with a unity gain bandwidth around 5 MHz. Much better part in almost every dimension than the LM741.Can we use an LM324 instead of an LM741 for constructing an op-amp integrator?Yes. It will likely perform slightly better too as it has a slightly better specification (frequency, slew rate, etc), plus you get four identical op amps in a single 14 pin package.

The TDA7297 is a dual bridge amplifier specially designed for TV and Portable Radio applications.CatalogTDA7297 OverviewTDA7297 PinoutPin ConfigurationTDA7297 CAD ModelSpecificationsFeaturesTDA7297 Amplifier circuitWorking PrincipleWhere to Use a TDA7297 Amplifier?How to Use TDA7297?ApplicationsAlternatives Audio Amplifiers2-D Model (PDIP)ManufactureTDA7297 DatasheetTDA7297 OverviewThe TDA7297 is a common dual bridge amplifier IC, they had a wide range of applications in sound systems such as television boards and PC amplifier boards. In this post, we properly explain important information’s about the TDA7297 datasheet. The discussion of the TDA7297 datasheet useful for those who work with amplifier boards using TDA7297 amplifier IC, in this article we include information’s about the TDA7297 amplifier IC from our experience.TDA7297 stereo audio amplifier board test and review  TDA7297 Pinout TDA7297 Pinout Pin ConfigurationPin NumberPin NameDescription1OUT1+Channel 1- Non-Inverting Output 2OUT1-Channel 1 – Inverting Output 3,13VccSupply Voltage (6V to 18V)4IN1Channel 1 Input5N.CNo Connection6MuteCan be used to mute the output7Stand-ByPut IC on stand-by when not used to save battery charge8Pw-GndGround terminal of power supply9S-GroundGround terminal of audio (signal)10N.CNo Connection11N.CNo Connection12IN2Channel 2 Input 14OUT2-Channel 2 – Inverting Output15OUT2+Channel 1 – Non-Inverting Output  TDA7297 CAD Model TDA7297 Symbol TDA7297 Footprint  SpecificationsProduct AttributeAttribute ValueManufacturer:STMicroelectronicsProduct Category:Audio AmplifiersRoHS:DetailsSeries:TDA7297Product:Audio AmplifiersClass:Class-ABOutput Power:15 WMounting Style:Through HoleType:2-Channel StereoPackage / Case:Multiwatt-15Audio - Load Impedance:8 OhmsTHD plus Noise:0.001Supply Voltage - Max:18 VSupply Voltage - Min:6.5 VMinimum Operating Temperature:0 CMaximum Operating Temperature:+ 70 CPackaging:TubeDescription/Function:SpeakerHeight:10.7 mmInput Type:SingleLength:19.6 mmOutput Current:2 ASupply Type:SingleWidth:5 mmBrand:STMicroelectronicsGain:32 dBNumber of Channels:2 ChannelOperating Supply Current:2 AOperating Supply Voltage:9 V, 12 V, 15 VOutput Signal Type:DifferentialPd - Power Dissipation:33000 mWProduct Type:Audio AmplifiersPSRR - Power Supply Rejection Ratio:56 dBFactory Pack Quantity:500Subcategory:Audio ICsUnit Weight:0.255983 oz FeaturesWIDE SUPPLY VOLTAGE RANGE (6V -18V)MINIMUM EXTERNAL COMPONENTS(1) NO SVR CAPACITOR(2) NO BOOTSTRAP(3) NO BOUCHEROT CELLS(4) INTERNALLY FIXED GAIN STAND-BY & MUTE FUNCTIONSSHORT CIRCUIT PROTECTIONTHERMAL OVERLOAD PROTECTION Absolute Maximum Ratings Supply Voltage : VS = 20 VOutput Peak Current (internally limited) : IO = 2 ATotal Power Dissipation (Tcase = 70°C) : Ptot = 33 W TDA7297 Amplifier CircuitThe TDA7297 datasheet suggests two amplifier circuits based on microprocessor applications and low-cost applications, both these circuits will enhance standby and mute function at the TDA7297 amplifier IC. Microprocessor application circuit Low-cost application circuit The pop-noise during turn ON/OFF transitions, quite simply obtains this function using a microprocessor, and TDA7297 amplifier IC has in build mute and stability function. Working PrincipleThe microprocessor-based and low-cost TDA7297 IC-based amplifier circuit has the same working operation, so we just explain some components functions at this circuit.The bypass capacitors such as C1 and C2 or C5 and C6 for microprocessor version used to bypasses the signal towards the device, the C3 and C5 are the protection components that DC voltage offset from reaching your power source.For the low-cost application, we need a couple of resistor R1 and R2 to be used to make a voltage divider network to generate a half supply voltage to apply to standby and mute pins, and also a C4 capacitor charged by this voltage divider network. Where to Use a TDA7297 Amplifier?The TDA7297 is a Class AB dual channel audio amplifier. It is available in compact 15-pin package and can operate with 6V to18V making it suitable for consumer electronics like TV, Radio, Home theater etc. Audio amplifier circuits can also be made using simple op-amps, but if you need higher volume that is loud enough for a room then this power audio amplifier is will be the best choice. This IC can deliver up to 30W (15+15) of output power, so you can run two 4Ω speakers at 15W each for stereo audio quality.Another advantage of TDA7297 is it requires minimum external components to get it running. If you are looking for higher wattage amplifier then check out TDA7294 which can output 100W power.  How to Use TDA7297? The TDA7297 is a popular easy to use audio amplifier IC. The IC is a dual bridge amplifier, meaning it requires both left and right audio input to provide a stereo output. The output is also split into channel 1 and channel 2 each capable of driving 15W speakers. Each channel also has an inverting and non-inverting output for connecting the positive and negative terminal if the speaker. The typical application diagram is shown below.As you can see the IC requires only minimal number of components like few extra capacitor and resistor making it easy for designers to adapt it into compact portable applications like handheld radios or Bluetooth Speakers. Further the minimal requirement of components also reduces the BOM cost. The IC also comes in with a built-in mute function and stand-by function. The mute function eliminates the requirements of additional components while the stand-by can be used to conserver battery. Normally a microprocessor is used to control the mute and stand-by features based on the input from the user. How to use TDA7297ApplicationsUsed for Audio signal AmplificationSuitable for medium power amplificationCapable of operating on dual/split power supplyStereo audio application Alternatives Audio AmplifiersTDA2030, TDA1554, TDA7294,  2-D Model (PDIP) 2-D Model (PDIP) ManufactureSTMicroelectronics is a global independent semiconductor company and a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivaled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio, and strategic partners positions, STMicroelectronics is at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence trends.  TDA7297 DatasheetTDA7297 Datasheet