The Kynix Components

TL431 is a Shunt Regulator. This blog covers TL431 Regulator pinout, datasheet, equivalent, features, and other information on how to use and where to use this device.This Video Introduced  TL431 Shunt Regulator Power Supply CircuitsCatalogTL431 PinoutTL431 ParametersTL431 CircuitTL431 FeaturesTL431 ApplicationTL431 PackageTL431 AdvantageTL431 Functional Block DiagramTL431 DocumentsComponent DatasheetFAQTL431 PinoutTL431 ParametersInitial accuracy (Max) (%)0.5, 1, 2Iout/Iz (Max) (mA)100Iz for regulation (Min) (uA)400Operating temperature range (C)-40 to 85, -40 to 125, 0 to 70RatingCatalogReference voltageAdjustableTemp coeff (Max) (ppm/ degree C)92VO (V)2.495VO adj (Max) (V)36VO adj (Min) (V)2.495TL431 CircuitPrecision High- Current Series RegulatorOutput Control of a Three-Terminal Fixed RegulatorHigh-Current Shunt RegulatorTL431 FeaturesProgrammable Zener diodeOutput voltage: 2.5V to 36VOutput Current: 1mA to 100mA (sink current)Output voltage tolerance: ±4%Output Impedance: 0.22 ohmsAvailable in To-92(3-pin) and PDIP, SOIC (8-pin) PackageTL431 ApplicationSwitch mode Power suppliesIsolated Power supply circuitsVoltage comparatorsCurrent Regulation circuitsTL431 PackagePackagePinsSizePDIP (P) 893 mm² 9.81 x 9.43SOIC (D)819 mm² 4.9 x 3.9SOIC (D)819 mm² 3.91 x 4.9SOP (PS)848 mm² 6.2 x 7.8SOT-23 (DBV)55 mm² 2.9 x 1.6SOT-23 (DBZ)37 mm² 2.92 x 2.37SOT-89 (PK)318 mm² 4.5 x 4.095SOT-SC70 (DCK)64 mm² 2 x 2.1TO-92 (LP)319 mm² 5.2 x 3.68TSSOP (PW)819 mm² 3 x 6.4TL431 AdvantageThe TL431 device is three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors. The device has a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL431 is offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.TL431 Functional Block Diagram　　Vref is an internal 2.5V reference source, connected to the reverse input of the op amp. It can be seen from the characteristics of the op amp that only when the voltage at the REF terminal (the same direction terminal) is higher than Vref (2.5V), current will flow in the transistor. When the non-inverting input voltage is less than 2.5V, the triode is in the cut-off state (in an ideal state), and the current through the triode will change from 1mA to 100mA with the slight change of the REF terminal voltage. Of course, this diagram is by no means the actual internal structure of TL431, but it can be used to analyze and understand the circuit.　　 TL431 DocumentsSelection Guides431 Device Nomenclature (Rev. B)Application notes 1Designing With the Improved TL431LI (Rev. A)Application notes 2TL431 Pin FMEA Component DatasheetTL431 DatasheetFAQWhat is the Use of TL431?The TL431 is a "programmable precision reference" and is commonly used in switching power supplies, where it provides feedback indicating if the output voltage is too high or too low. By using a special circuit called a bandgap, the TL431 provides a stable voltage reference across a wide temperature range.What is TL431 Ttransistor?The TL431 is a regulator diode whose output voltage can be programmed by changing the value of resistors connected to it. It acts almost like a Zener diode except for that the voltage rating of this IC is programmable. It is commonly used to provide negative or positive voltage references.How Does a Shunt Regulator Work?The shunt regulator or shunt voltage regulator is a form of voltage regulator where the regulating element shunts the current to ground. The shunt regulator operates by maintaining a constant voltage across its terminals and it takes up the surplus current to maintain the voltage across the load.How does a shunt regulator work?The shunt regulator or shunt voltage regulator is a form of voltage regulator where the regulating element shunts the current to ground. The shunt regulator operates by maintaining a constant voltage across its terminals and it takes up the surplus current to maintain the voltage across the load.Where are shunt regulators used?Voltage reference circuitsWhat is the output voltage of the TL431?2.5 V~36 V

Executive Summary (2026 Update): The 2N7000 is an industry-standard N-Channel Enhancement Mode MOSFET widely used for low-power switching (up to 60V/200mA) in logic-level circuits. Ideal for interfacing 3.3V/5V microcontrollers (Arduino, ESP32) with higher voltage loads, it remains a staple in prototyping due to its low gate threshold and TO-92 form factor.What is the 2N7000 MOSFET?The 2N7000 is a widely used N-Channel Enhancement Mode Field Effect Transistor (MOSFET) designed for voltage-controlled small signal switching. As of 2026, it remains the go-to component for hobbyists and engineers requiring a reliable logic-level switch for loads under 200mA.2N7000 N Channel Enhancement Mode MOSFET Switch Circuit BasicsWhat is the 2N7000 Pinout Configuration?The 2N7000 (TO-92 package) features three terminals: Source (1), Gate (2), and Drain (3). Correct identification is critical, as swapping pins with similar MOSFETs (like the BS170) will cause circuit failure.Pin NumberPin NameDescription1Source (S)Current flows out through Source (Connected to Ground in N-Channel switching)2Gate (G)Controls the biasing; accepts logic-level voltage (3.3V - 5V) to trigger the switch3Drain (D)Current flows in through Drain (Connected to Load)Key 2N7000 Datasheet Parameters (2026 Standards)These specifications represent the standard operating limits for the 2N7000 as manufactured by major silicon vendors (Microchip, Onsemi, Vishay) in 2026.ConfigurationSINGLE N-CHANNEL WITH BUILT-IN DIODEContinuous Drain Current (ID)200mA (Standard)Drain Current-Max (Pulsed)500mA (0.5 A)Gate Threshold Voltage (Vgs(th))0.8V (Min) to 3.0V (Max) - Logic Level CompatibleDrain to Source Voltage (Vdss)60VDrain-source On Resistance (Rds(on))Max 5 Ω @ 10V VgsDS Breakdown Voltage-Min60 VElement ConfigurationSingleInput Capacitance (Ciss)Max 60 pF (Low capacitance for fast switching)FET TechnologyMETAL-OXIDE SEMICONDUCTOR (DMOS)Gate to Source Voltage Max (Vgs)±20V to ±30V (depending on manufacturer)Height5.33mmJEDEC Package CodeTO-92 (Through-Hole)Lead Free StatusRoHS Compliant / Pb-FreeLength5.21mmPrimary ManufacturersMicrochip, Onsemi, Vishay, Diodes Inc.Max Power Dissipation350mW - 400mW (approx 1W with heat sinking)Operating Temperature Range-55 °C to +150 °CPolarityN-CHANNEL Enhancement ModeTransistor ApplicationSmall Signal Switching, Logic Level ShiftingWhy Choose the 2N7000? (Key Features)The 2N7000 remains popular in 2026 designs because it combines the durability of older silicon processes with modern logic compatibility.Logic Level Compatible: Low threshold voltage (0.8V - 3V) allows direct driving from Arduino, ESP32, and Raspberry Pi GPIOs.Rugged Design: Free from secondary breakdown and thermal runaway.Efficiency: Low power drive requirement with high input impedance.Speed: Low CISS (Input Capacitance) ensures fast switching speeds (typically <10ns).Flexibility: Ease of paralleling for higher current handling.Protection: Integral source-drain diode (Body Diode) handles inductive kickback.Common 2N7000 Applications in 2026While surface-mount components dominate mass production, the 2N7000 is essential for:Motor Control: Driving small DC motors or fans from microcontroller pins.Logic Level Shifting: Converting 3.3V logic to 5V or 12V signals.LED Drivers: Switching high-brightness LEDs or LED strips.Relay Drivers: Activating mechanical relays or solenoids.Audio Amplifiers: Small signal amplification in high-fidelity audio circuits.The 2N7000 has historically been nicknamed the "FETlington" (a portmanteau of FET and Darlington) due to its high gain and saturation characteristics similar to Darlington transistors, making it an "absolutely ideal hacker part" for rapid prototyping.Advantages over Bipolar Junction Transistors (BJTs):High Input Impedance: The insulated gate draws almost zero current, meaning it does not load the microcontroller's GPIO pin.Simplicity: No current-limiting base resistor is required (though a small gate resistor is recommended to dampen ringing).Paralleling: MOSFETs have a positive temperature coefficient, preventing current hogging when used in parallel.Disadvantages to Consider:ESD Sensitivity: Like all MOSFETs, the gate is susceptible to static discharge damage.Floating Gate: The gate must never be left floating; a pull-down resistor (10kΩ) is mandatory to keep the switch "OFF" during startup.2N7000 Technical AdvantageThe 2N7000 utilizes vertical DMOS technology. This structure delivers the power handling of bipolar transistors with the high input impedance of MOS devices. In modern 2026 applications, this allows for efficient switching without the thermal runaway risks associated with older BJT designs. It is ideally suited for applications requiring very low threshold voltage and high breakdown voltage (60V).2N7000 Switching Waveforms and Test CircuitUnderstanding the switching characteristics is vital for high-frequency applications (PWM).2N7000 Package Information (TO-92)The 2N7000 is most commonly found in the TO-92 through-hole package.Front View (Flat Side): Leads facing down.Side View:Bottom View (Pin Identification):　　Global Popularity Trends (2026)Demand for the 2N7000 remains strong in regions with high educational and hobbyist electronics activity.2N7000 Alternatives & EquivalentsIn 2026, engineers often choose between the 2N7000 and the BS170. Warning: While specifications are similar, the pinout is reversed.Part NumberPackageKey Difference2N7000TO-92Standard (S-G-D). ID=200mA.BS170TO-92Reversed Pinout (D-G-S). Higher Current (500mA).2N7002SOT-23 (SMD)Surface Mount equivalent. Best for modern PCBs.Step-by-Step: How to Use the 2N7000 in a CircuitThe 2N7000 acts as a low-side switch. Follow these steps to control a 24V load using a 3.3V or 5V microcontroller.Connect Source to Ground: Pin 1 (Source) must connect to the common ground (GND).Connect Load to Drain: Connect the negative wire of your load (Motor, LED) to Pin 3 (Drain). Connect the positive wire of the load to your power supply (up to 60V).Control via Gate: Connect Pin 2 (Gate) to your microcontroller's GPIO pin.Add Protection:Place a 10kΩ Pull-Down Resistor between Gate and Ground to prevent floating.If driving a motor (inductive load), place a Flyback Diode across the motor terminals to prevent voltage spikes.Example Circuit: The diagram below shows a 2N7000 controlling a 24V load.Logic: When the Gate Voltage (VGS) exceeds the threshold (approx 2.1V), the MOSFET turns ON, completing the circuit for the load. When VGS is 0V (Grounded), the MOSFET turns OFF.Where to use 2N7000The 2N7000 is ideal for scenarios requiring a compact N-channel switch.Low Power Switching: Loads < 200mA and < 60V.Signal Processing: Fast switching times make it suitable for data signal modulation.Level Shifting: Interfacing 3.3V logic to 12V automotive systems.Space Constrained Designs: The TO-92 package is small yet easy to hand-solder.Product ManufacturerMicrochip Technology Inc. is a key manufacturer (following the acquisition of Supertex). However, due to its industry-standard nature, the 2N7000 is also produced by Onsemi, Vishay, and Diode Inc., ensuring widespread availability in 2026.Frequently Asked Questions (FAQ)What is a 2N7000 MOSFET used for?The 2N7000 is a small signal N-channel MOSFET used to switch low-power loads (up to 60V, 200mA). It acts like a digital switch, allowing low-voltage logic (like a 3.3V microcontroller) to control higher voltage devices like relays, LEDs, and small motors.What is the maximum voltage for a 2N7000?The 2N7000 has a maximum Drain-Source Voltage (VDS) of 60V. The Gate-Source Voltage (VGS) limit is typically ±20V to ±30V.What is the Gate Threshold Voltage?The gate threshold voltage (VGS(th)) is between 0.8V and 3.0V. This means it begins to conduct at very low voltages, making it compatible with 3.3V logic systems.Is the 2N7000 N-Channel or P-Channel?It is an N-Channel Enhancement Mode MOSFET. It requires a positive voltage on the Gate relative to the Source to turn on.Can I replace a 2N7000 with a BS170?Yes, but be careful. While electrically similar, the pinout is reversed. 2N7000 is Source-Gate-Drain (1-2-3), while BS170 is Drain-Gate-Source (1-2-3). You must rotate the BS170 180 degrees to fit a 2N7000 PCB footprint.Does the 2N7000 need a gate resistor?Technically, no current limiting resistor is needed because the gate impedance is infinite. However, a small resistor (e.g., 100Ω) is recommended to prevent ringing (oscillations), and a pull-down resistor (10kΩ) is required to prevent floating states.{ "@context": "https://schema.org", "@type": "Article", "headline": "2N7000 MOSFET Guide: Pinout, Datasheet & Equivalents (2026)", "description": "Comprehensive guide to the 2N7000 N-Channel MOSFET. Includes 2026 datasheet specs, pinout diagrams, Arduino connection guide, and modern alternatives like the BS170.", "image": "https://www.apogeeweb.net/upload/image/20201107/2020110715214973.jpg", "datePublished": "2020-11-07", "dateModified": "2026-01-08", "author": { "@type": "Organization", "name": "Tech Resource" }, "mainEntity": [ { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is a 2N7000 MOSFET used for?", "acceptedAnswer": { "@type": "Answer", "text": "The 2N7000 is a small signal N-channel MOSFET used to switch low-power loads (up to 60V, 200mA). It acts like a digital switch, allowing low-voltage logic (like a 3.3V microcontroller) to control higher voltage devices like relays, LEDs, and small motors." } }, { "@type": "Question", "name": "Can I replace a 2N7000 with a BS170?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, but be careful. While electrically similar, the pinout is reversed. 2N7000 is Source-Gate-Drain (1-2-3), while BS170 is Drain-Gate-Source (1-2-3). You must rotate the BS170 180 degrees to fit a 2N7000 PCB footprint." } }, { "@type": "Question", "name": "What is the maximum voltage for a 2N7000?", "acceptedAnswer": { "@type": "Answer", "text": "The 2N7000 has a maximum Drain-Source Voltage (VDS) of 60V. The Gate-Source Voltage (VGS) limit is typically ±20V to ±30V." } } ] }, { "@type": "HowTo", "name": "How to connect a 2N7000 MOSFET to a Microcontroller", "step": [ { "@type": "HowToStep", "name": "Connect Source to Ground", "text": "Connect Pin 1 (Source) of the 2N7000 to the common ground (GND) of your circuit." }, { "@type": "HowToStep", "name": "Connect Load to Drain", "text": "Connect the negative terminal of your load (e.g., Motor, LED) to Pin 3 (Drain). Connect the positive terminal of the load to the power supply." }, { "@type": "HowToStep", "name": "Connect Gate to GPIO", "text": "Connect Pin 2 (Gate) to the digital output pin of your microcontroller (Arduino/ESP32)." }, { "@type": "HowToStep", "name": "Add Pull-Down Resistor", "text": "Place a 10k Ohm resistor between the Gate and Ground to ensure the MOSFET stays OFF when the microcontroller signal is floating." } ] } ]}

I IntroductionHere, you can learn about the AD620 instrument amplifier circuit. Besides, you can also browse AD620 main features, working principles, and applications. This blog generally discusses the following 3 basic questions: 1. What is an instrumentation amplifier; 2. How does it work; 3. How and where to use it.Figure 1. AD620CatalogI IntroductionII DescriptionIII AD620 Technical IndicatorsIV AD620 Working PrincipleV AD620 ApplicationVI ConclusionFAQOrdering & QuantityII DescriptionOperational amplifiers have evolved over the decades and as a result, there is a wide variety of them. They can be easily categorized according to their application requirements. The main categories include general-purpose, low-voltage, low-power, high-speed, and high-precision types. In recent years, applications such as consumer electronics, communication, and networking have been developing continuously. And these constantly developing industries also put forward new technical requirements for op-amp products.AD620 instrument amplifier is the product of AD company. Due to its super β technology, AD620 has the following characteristics:1.3mA Maximum Working Current5μV Input Offset Voltage1μV/℃ Input Offset Drift Maximum93dB Common Mode Rejection RatioAdjustable Gain RangeEasy to Adjust and Low Noise.And why can AD620  become an industry-standard high-performance, low-cost instrumentation amplifier? That's because the core of AD620  is a three-stage op-amp circuit, which has a high common-mode rejection ratio, good temperature stability, wide amplification band, and low noise. And it has the characteristics of high accuracy, easy use, and low noise. so this is also the reason why AD620 can be so popular.III AD620 Technical IndicatorsThe main technical indicators of AD620 are as follows:Bandwidth800MHzOutput power2.4mWPower gain120dBWorking voltage±15VStatic power consumption0.48mWInoltage≤60μVConversion rate1.2V/μSPackage formDIP8Operating temperature range-55℃～+125℃IV AD620 Working PrincipleThe functional structure of the AD620 amplifier is shown in Fig. 2.　　Figure 2. AD620 Functional Block DiagramDo you know what the characteristics of this amplifier are? The answer is: differential input, a single-ended output. The voltage gain can be determined by a resistor RG. The gains are adjustable, which solves the problem of connecting the subsequent load to the ground. Besides, A1 and A2 form a differential input and a differential output with in-phase high input impedance and undertake all gain amplification tasks. Because the circuit structure is symmetrical, which means when the gain changes, the input impedance does not change.The feedback resistance Rl=R2=24.7k. The common-mode gain, offset, drift, and other errors of the amplifiers A1 and A2 are mutually compensated. The gain of the latter stage A3 is 1, which has a higher common-mode rejection ratio and anti-interference ability.AD620 is a monolithic integrated amplifier. And it is developed on the basis of the improvement of the traditional three-op amplifier combination. As shown in Figure 2, the input transistors Q1 and Q2 provide the only bipolar differential input. Due to the internal ultra-β processing, its input offset current is 10 times lower than the general case. Through the feedback of the Q1-A1-R1 loop and the Q2-A2-R2 loop, the integrated pole current of Q1 and Q2 is kept constant. So the input voltage is equivalent to the two ends of the external resistor RG.The differential amplification factor from input to A1/A2 output is G=(R1+R2)/RG+1. The unity gain subtractor composed of A3 eliminates any common-mode components. Thereby, it produces a single-channel output related to the potential of the REF pin.Figure 3. AD620So what about RG?The value of RG also determines the transconductance of the previous stage op-amp. When RG decreases, the magnification increases. When RG decreases, the transconductance to the input transistor gradually increases. This has the following two obvious advantages:First, the increase in the amplification factor increases the open-loop gain. Thereby reducing the gain-bandwidth product and increasing the frequency response;Second, it is mainly determined by the input transistor collector current and base resistance.By accurately correcting the value of the internal gain resistors R1 and R2 to 24.7kΨ, we can make the operational amplifier gain (derived by calculation) accurately determined by RG: G=49.4kΨ/RG+1 or RG=49.4kΨ/(G- 1)　　Figure 4. AD620 Circuit Structure DiagramRG is the external gain adjustment. To meet the required amplification factor, we can connect this high-precision resistance between pin 1 and 8. By using the amplifier AD620.  the gain error can be less than 0.01%, and the non-linearity is less than 0.002%. From the application point of view, AD620 is particularly suitable for applications. Such as sensor interface, ECG monitor, precision voltage current conversion, and other applications. If we analyze the circuit technology performance, we will a deeper understanding of AD620,  That is, AD620 is actually a low-power, high-precision instrument, broadband integrated operational amplifier.V AD620 ApplicationInstrumentation amplifiers are sometimes misunderstood by people. Here, we need to point out 2 ideas:First, not all amplifiers used for instrumentation are instrumentation amplifiers;Second, all instrumentation amplifiers are by no means only used for instrumentation. Instrumentation amplifiers are used in many fields. From motor control to data acquisition and automotive systems.The instrumentation amplifier is a closed-loop gain unit. And with a differential input and single-ended output relative to the reference end. In most cases, the impedance of the two input ends of the instrumentation amplifier is balanced. The resistance is very high, and its typical value is ≥109Ψ. The input bias current is also very low, typically 1nA to 50nA. Like the operational amplifier, its output impedance is very low, usually only a few milliohms in the low-frequency range. The closed-loop gain of an operational amplifier is determined by the external resistance. The external resistance is connected between its inverting input and output.There are differences between the instrument amplifier and the amplifier. The instrument amplifier uses an internal feedback resistor network, which is isolated from its signal input. To apply input signals to the two differential input terminals of the instrumentation amplifier. The gain can either be preset internally or set by the user. Through a pin connected to an internal or external gain resistor, which is also isolated from the signal input terminal. Figure 5 shows a block diagram of a differential amplifier.Figure 5. Differential Amplifier ICThis type of IC is a special-purpose instrumentation amplifier. And it usually consists of a subtractor amplifier followed by an output buffer (perhaps one-stage gain). The four resistors used for the subtractor are usually inside the IC, so they can be precisely matched to achieve a higher CMR. Many differential amplifiers are suitable for applications. Where the common-mode voltage and signal voltage may easily exceed the supply voltage. These differential amplifiers usually use high-value input resistors to attenuate the signal.Generally speaking, instrumentation amplifiers and differential amplifiers are used in the following ranges:  Data AcquisitionThe main purpose of the instrumentation amplifier is to amplify the weak signal output by the sensor in a noisy environment. Amplification of signals from pressure sensors or temperature sensors is common. Common bridge applications include strain force and weight measurement. Medical InstrumentsInstrumentation amplifiers are widely used in medical equipment. Such as electrocardiographs and electroencephalographs, blood pressure monitors, and defibrillators. The differential amplifier of monitoring and control electronics can be used to monitor the voltage and current in the system and trigger the alarm system when the normal value is exceeded. Because differential amplifiers have the ability to suppress high common-mode voltages, they are often used in such applications.Figure 6. Electrocardiograph Software Programmable ApplicationsTo allow software to control the hardware system, we can turn to instrumentation amplifiers. Instrumentation amplifiers can be used on chips with software programmable resistors. Audio ApplicationsBecause instrumentation amplifiers have high CMR, they are used for audio (e.g. microphone preamplifiers) to extract weak signals in noisy environments. Also,it can be used to minimize the offset caused by ground loops Voltage and noise. High-speed Signal ConditioningDue to the increased speed and accuracy requirements of today's video data acquisition systems, the demand for broadband instrumentation amplifiers is increasing. Especially in the field of  CCD  imaging equipment that requires offset correction and input buffering.In this field, double correction sampling technology is usually used to correct the  CCD image. Generally, use two sample-and-hold amplifiers to monitor the image and reference level, and send the signal voltage to an instrumentation amplifier to provide a DC correction output.Figure 7. CCD Camera Video ApplicationsHigh-speed instrumentation amplifiers are used in many video and cable radio frequency (RF) systems to amplify or process high-frequency signals. Power Control ApplicationsInstrumentation amplifiers can also monitor the motor (monitoring and controlling the motor's speed, torque, etc.) by measuring the motor's voltage, current, and the phase relationship of the three-phase  AC  motor. The differential amplifier is used when the input signal voltage exceeds the power supply voltage.VI ConcusionGenerally speaking, high-speed operational amplifiers are mainly used in communication equipment, video systems, and test and measurement instruments. Advanced applications in test and measurement, communications, medical, imaging and other fields are the main driving forces to improve amplifier performance; DSL and consumer video applications are its largest markets.FAQWhat is AD620?AD620 is a low-cost, high-precision instrumentation amplifier. It only requires an external resistor to set the gain. The gain range is 1 to 10,000.Can I change AD620 to AD623 when making MCU products?Both AD620 and AD623 are single instrumentation amplifiers, and the pin arrangement is exactly the same.The main difference is: AD620 must use positive and negative power supplies, AD623 can be a positive and negative power supply or a single power supply.If the original board is AD620, you can replace it with 623; if the original board is AD623, you may not be able to replace it with 620 (it depends on whether the power supply of the original board circuit is dual power supply or single power supply).After replacing AD620 and AD623 in single-chip products, the program can work normally without modification.What is the difference between AD620BR and AD620AN?Their packages are different.What is the output resistance of AD620? How to adjust it?AD620 is a kind of low power consumption instrument amplifier, its output resistance is about 10K, this is the inherent characteristic of this chip, generally it is difficult to adjust.If you have requirements for output resistance, you can generally use an external circuit to solve it.Is AD620 a positive phase amplification or a reverse phase amplification?AD620 is an instrument amplifier, the output voltage is [(Vin+)-(Vin-)]*gain.If the desired signal is (Vin+)-(Vin-), the gain is positive, which is equivalent to positive amplification.Conversely, if the desired signal is (Vin-)-(Vin+), the gain is equivalent to negative, which is equivalent to reverse amplification.What is an instrumentation amplifier?Instrumentation amplifier, an improvement of the differential amplifier, has an input buffer, does not require input impedance matching, so that the amplifier is suitable for measurement and electronic instrumentsWhat is the core of AD620?A three-stage op-amp circuitWhat are the characteristics of AD620?Differential input, a single-ended output.What types of systems are instrumentation amplifiers used in?Data acquisition and automotive systems.What is the instrumentation amplifier?Closed-loop gain unitWhat type of amplifier does AD620 IC consist of?Subtractor amplifier 

STM32F103C8T6 is one of the mid-range microcontroller units of the STM32F103x8  family based on RISC  architecture. The STM32F103xx  medium-density performance line family includes the high-performance ARM Cortex-M3  32-bit RISC  core operating at a frequency of 72 MHz, high-speed embedded memory (Flash memory up to 128 Kbytes and SRAM  up to 20 Kbytes), and a wide range of enhanced I/Os and peripherals connected to two APB buses. All devices have two 12-bit  ADCs, three general-purpose 16-bit timers plus one PWM timer, as well as standard and advanced communication interfaces: up to two I2Cs and SPIs, three USARTs, a USB, and a CAN. This is a tutorial video shows how to connect STM32F103C8T6 with Arduino.CatalogSTM32F103C8T6 PinoutSTM32F103C8T6 FeaturesSTM32F103C8T6 ParametersSTM32F103C8T6 BenefitsSTM32F103C8T6 CAD ModelsSTM32F103C8T6 Functional EquivalentsSTM32F103C8T6 Popularity by RegionSTM32F103C8T6 DocumentsSTM32F103C8T6 PackageSTM32F103C8T6 ManufacturerComponent DatasheetSTM32F103C8T6 PinoutIf you want to learn the description and function of every pin, please check the page28-page33 in the datasheet.STM32F103C8T6 Features■ Core: ARM 32-bit Cortex™-M3 CPU– 72 MHz, 90 DMIPS with 1.25 DMIPS/MHz– Single-cycle multiplication and hardware division– Nested interrupt controller with 43 maskable interrupt channels– Interrupt processing (down to 6 CPU cycles) with tail chaining■ Memories– 32-to-128 Kbytes of Flash memory– 6-to-20 Kbytes of SRAM  ■ Clock, reset, and supply management– 2.0 to 3.6 V application supply and I/Os– POR, PDR, and programmable voltage detector (PVD)– 4-to-16 MHz quartz oscillator– Internal 8 MHz factory-trimmed RC– Internal 32 kHz RC– PLL for CPU clock– Dedicated 32 kHz oscillator for RTC with calibration■ Low power– Sleep, Stop and Standby modes– VBAT supply for RTC and backup registers■ 2 x 12-bit, 1 µs A/D converters (16-channel)– Conversion range: 0 to 3.6 V– Dual-sample and hold capability– Synchronizable with advanced control timer– Temperature sensor■ DMA– 7-channel DMA controller– Peripherals supported: timers, ADC, SPIs, I2Cs and USARTsSTM32F103C8T6 ParametersManufacturer Part Number:STM32F103C8T6Part Life Cycle Code:ActiveIhs Manufacturer:STMICROELECTRONICSPart Package Code:QFPPackage Description:LFQFP, QFP48,.28SQ,20Pin Count:48Reach Compliance Code:compliantHTS Code:8542.31.00.01Risk Rank:0.85Has ADC:YESBit Size:32JESD-30 Code:S-PQFP-G48Length:7 mmNumber of I/O Lines:37Operating Temperature-Max:85 °COperating Temperature-Min:-40 °CPackage Body Material:PLASTIC/EPOXYPackage Shape:SQUAREPackage Style:FLATPACK, LOW PROFILE, FINE PITCHPeak Reflow Temperature (Cel):260ROM Programmability:FLASHSeated Height-Max:1.6 mmSpeed:72 MHzSupply Voltage-Max:3.6 VSupply Voltage-Min:2 VSupply Voltage-Nom:3.3 VTechnology:CMOSTemperature Grade:INDUSTRIALTerminal Form:GULL WINGTerminal Pitch:0.5 mmTerminal Position:QUADuPs/uCs/Peripheral ICs Type:MICROCONTROLLER, RISCRohs Code:YesECCN Code:3A991.A.2Factory Lead Time:14 WeeksCPU Family:STM32Clock Frequency-Max:16 MHzDAC Channels:NOOn Chip Program ROM Width:8Package Code:LFQFPPackage Equivalence Code:QFP48,.28SQ,20Power Supplies:2.5/3.3 VQualification Status:Not QualifiedRAM (bytes):20480ROM (words):65536Subcategory:MicrocontrollersJESD-609 Code:e4Terminal Finish:Nickel/Palladium/Gold (Ni/Pd/Au)Time@Peak Reflow Temperature-Max (s):30Moisture Sensitivity Level:2Supply Current-Max:50 mABrand Name:STMicroelectronicsFormat:FIXED POINTNumber of External Interrupts:16Number of DMA Channels:7STM32F103C8T6 BenefitsExcellent real-time behaviourOustanding power efficiencySuperior and innovative peripheralsMaximum integrationCross family pin-to-pin, peripheral and software compatibilitySTM32F103C8T6 CAD ModelsPart SymbolFootprint3D ModelSTM32F103C8T6 Functional EquivalentsPart NumberDescriptionManufacturerSTM32F103C8T6TRMICROCONTROLLERS AND PROCESSORSMainstream Performance line, Arm Cortex-M3 MCU with 64 Kbytes of Flash memory, 72 MHz CPU, motor control, USB and CANSTMicroelectronicsSTM32F103C8T7TRMICROCONTROLLERS AND PROCESSORSMainstream Performance line, Arm Cortex-M3 MCU with 64 Kbytes of Flash memory, 72 MHz CPU, motor control, USB and CANSTMicroelectronicsSTM32F103C4T6AXXXMICROCONTROLLERS AND PROCESSORS32-BIT, FLASH, 72MHz, RISC MICROCONTROLLER, PQFP48, 7 X 7 MM, ROHS COMPLIANT, LQFP-48STMicroelectronicsSTM32F103C8T6XXXMICROCONTROLLERS AND PROCESSORS32-BIT, FLASH, 1.25MHz, RISC MICROCONTROLLER, PQFP48, 7 X 7 MM, ROHS COMPLIANT, LQFP-48STMicroelectronicsSTM32F103C8T7XXXMICROCONTROLLERS AND PROCESSORS32-BIT, FLASH, 1.25MHz, RISC MICROCONTROLLER, PQFP48, 7 X 7 MM, ROHS COMPLIANT, LQFP-48STMicroelectronicsSTM32F103C4T6ATRMICROCONTROLLERS AND PROCESSORS32-BIT, FLASH, 72MHz, RISC MICROCONTROLLER, PQFP48, 7 X 7 MM, ROHS COMPLIANT, LQFP-48STMicroelectronicsSTM32F103C8T6 Popularity by RegionSTM32F103C8T6 DocumentsEnvironmentalRoHS Certificate (PDF)ModelsSTM32F103C8T6 Symbol & Footprint by SnapEDAPCNAmkor ATT3 (Taiwan) additional EWS site for STM8 and STM32 devices - Standard products (PDF)PROCESS CHANGE NOTIFICATION (PDF)PRODUCT / PROCESS CHANGE NOTIFICATION (PDF)PRODUCT / PROCESS CHANGE NOTIFICATION (PDF)Product / Process Change Notification (PDF)Product Change Notification (PDF)Product Change Notification (PDF)STMicroelectronics - PCN 5-26-10 (PDF)STM32F103C8T6 PackageLQFP48 7 x 7 mm, 48-pin low-profile quad flat packageSTM32F103C8T6 ManufacturerSTMicroelectronics is a global independent semiconductor company and is 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 the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence trends.Component DatasheetSTM32F103C8T6 DatasheetFAQHow many 12-bit ADCs do all STM32F103xx devices have?Two What is STM32F103C8T6?A medium density performance line, ARM Cortex-M3 32bit microcontroller in 48 pin LQFP package.

The IRF840 is an n-channel power MOSFET. It is a fast switching and high voltage device that is available with low on-state resistance.CatalogIntroduction to IRF840IRF840  CAD ModelIRF840 PinoutPin ConfigurationIRF840 FeaturesSpecificationsReplacement and EquivalentIRF840 PackageTesting CircuitIRF840 Applications2D Model of the ComponentWhere We Can Use it & How to Use?How to Safely Long Run in a Circuit?IRF840 DatasheetFAQ Introduction to IRF840The IRF840 is an n-channel power MOSFET that supports loads up to 8A and 500V. It is a fast switching and high voltage device that requires 10V across the gate terminal to initiate the conduction process.This IRF840 MOSFET is a three-terminal device made of gate (G) drain (D) and source (S) terminals. The external circuits are connected with these MOSFETs through these terminals.This is an N-channel MOSFET, here the conduction process is exercised by the flow of electrons in contrast to the P-channel MOSFET where the conduction process is carried out by the flow of holes.It is important to note that conduction is a process that is carried out inside MOSFET by the movements of both electrons and holes but electrons are major carriers in the n-channel MOSFET devices while holes are major carriers in the p-channel MOSFET devices.How to make stereo power amplifier using mosfet IRF840 The MOSFET stands for Metal Oxide Silicon Field Effect Transistor. It is also known as IGFET Insulated Gate Field Effect Transistor. It is made by the controlled oxidation of a silicon semiconductor material.MOSFETs and BJTs (bipolar junction transistors) are considered as different semiconductors as BJT is a current-controlled device while the MOSFET is a voltage-controlled device.The voltage applied at the gate terminal usually is directly related to the current between the source and drain terminals. The gate terminal voltage controls the current at the drain and source terminals. Simply put, the gate terminal acts like a control valve that controls the current between two terminals.   IRF840  CAD Model  IRF840  CAD Model   IRF840 Pinout IRF840 Pinout Pin Configuration Pin NumberPinNameDescription1SourceCurrent flows out through Source (maximum 8A)2GateControls the biasing of the MOSFET (Threshold voltage 10V)3DrainCurrent flows in through Drain IRF840 Features Type: N-Channel fast switching Power MOSFETRise time and the fall time is 23nS and 20nS respectivelyGate threshold voltage (VGS-th) = 10V (limit = ±20V)Continuous Drain Current (ID) = 8ADrain Source Resistance (RDS) = 0.85 OhmsAvailable package = TO-220Drain to Source Breakdown Voltage = 500V  SpecificationsProduct AttributeAttribute ValueManufacturer:STMicroelectronicsProduct Category:MOSFETRoHS:DetailsTechnology:SiMounting Style:Through HolePackage / Case:TO-220-3Transistor Polarity:N-ChannelNumber of Channels:1 ChannelVds - Drain-Source Breakdown Voltage:500 VId - Continuous Drain Current:8 ARds On - Drain-Source Resistance:850 mOhmsVgs - Gate-Source Voltage:- 20 V, + 20 VMinimum Operating Temperature:- 65 CMaximum Operating Temperature:+ 150 CPd - Power Dissipation:125 WChannel Mode:EnhancementPackaging:TubeConfiguration:SingleHeight:9.15 mmLength:10.4 mmSeries:IRF840Transistor Type:1 N-ChannelWidth:4.6 mmBrand:STMicroelectronicsFall Time:9 nsProduct Type:MOSFETRise Time:21 nsFactory Pack Quantity:50Subcategory:MOSFETsTypical Turn-On Delay Time:10 nsUnit Weight:0.068784 oz  Replacement and EquivalentYTA840, IRF841, IRF842, IRF843, IRFI840G, IRFS840, IRFS841, STP8NA50, 2SK554, 2SK1158, 2SK1566, 2SK1567, 2SK1805, 2SK2116, 2SK2117, 2SK2118, 2SK2175, IRF744. IRF840 Package IRF840 Packing Testing Circuit Unclamped Inductive Load Test Ciruit   Swithing Times Test Circuit For Resistive Load   Gate Testing CircuitIRF840 ApplicationsThe IRF840 is used in the following applications.Used in Inverter Circuits and DC-DC Converters.Incorporated in High-Speed switching applications.Used for switching high power devices.Employed in Control speed of motors and LED dimmers or flashers. 2D Model of the ComponentIf you are designing a PCB or Perf board with this component then the following picture from the IRF840 Datasheet will be useful to know its package type and dimensions. 2D model of the component  Where We Can Use it & How to Use?IRF640 can be used in circuit where you want to drive a high voltage load of upto 500V with upto 8A load current. It can also be used in circuits where high speed switching is crucial. Additionally you can use it directly at the output of ICs, microcontrollers and other electronic platforms like Arduino and Raspberry Pi to drive loads.Other than that it can also be used to build high power audio amplifiers.  How to Safely Long Run in a Circuit?To get long term performance it is always better to use a component on its full extent or on its maximum limits. Therefore we suggest to always use a component to its 80% capability or 20% below from its max ratings. The max load voltage IRF840 can handle is 500V therefore do not drive load of more than 400V. The max drain current is 8A therefore do not drive load of more than 6.4A and always operate the transistor in temperature above -55 degree centigrade and below +150 degree centigrade. IRF840 DatasheetIRF840 Datasheet   FAQWhat is IRF840?The IRF840 is an N-Channel Power MOSFET which can switch loads upto 500V. The Mosfet could switch loads that consume upto 8A, it can turned on by providing a gate threshold voltage of 10V across the Gate and Source pin. ... Hence this mosfet cannot be used in applications where high switching efficiency is required. How many drain S is are there in a IRF840?It is a fast switching and high voltage device that requires 10V across the gate terminal to initiate the conduction process. This IRF840 MOSFET is a three-terminal device made of gate (G) drain (D) and source (S) terminals. How do you know if a MOSFET is good or bad?A good MOSFET should have a reading of 0.4V to 0.9V (depends on the MOSFET type). If the reading is zero, the MOSFET is defective and when the reading is “open” or no reading, the MOSFET is also defective. When you reverse the DMM probe connections, the reading should be “open” or no reading for a good MOSFET.

DescriptionLED, as the first basic function to be completed in MCU learning, plays a very important role in MCU learners, which also called “magic lamp” by MCU learners. I believe that everyone sees most and the simplest LED circuit is the figure shown below. As shown in the figure, not only the circuit is simple, but also its operation is very simple. Gives electrical level to I/O corresponding to eight LEDs, and the corresponding LED can be on or off.Figure 1. simple LED circuitCatalogDescription74HC595 Drives 8 Bits LEDSFAQOrdering & Quantity 74HC595 Drives 8 Bits LEDSBut not all LED circuits are so simple. Some circuits will use 74HC595 chip to drive 8 LEDs or drive the 8-bit digital tube segment code, as shown in the figure below.Figure 2. 74HC595 drives 8 LEDsWhy is a simple circuit so complicated? The reason is obvious. Before the eight LED need eight I/O, now only three I/O can drive eight LED. Let's briefly introduce 74CH595 and use it successfully to drive eight LED lights.The 74HC595 is an 8-bit serial-in or parallel-out shift register with a storage register and 3-state outputs. Both the shift and storage register have separate clocks. The device features a serial input (DS) and a serial output (Q7S) to enable cascading and an asynchronous reset MR input.SI is its serial data input. Q0 to Q7 are data output. SCK, is the clock for the shift register. The 595 is clock-driven on the rising edge. This means that in order to shift bits into the shift register, the clock must be HIGH. And bits are transferred in on the rising edge of the clock. RCK, is a very important pin. When driven HIGH, the contents of Shift Register are copied into the Storage/Latch Register; which ultimately shows up at the output. So the latch pin can be seen as like the final step in the process to seeing our results at the output. SQH is serial data output.What we want to achieve now is to move the 8-bits data of SI into 74HC595 one by one under the action of SCK and RCK and present them in parallel on Q0-Q7.Figure 3. How 74HC595 Shift Register worksWhenever we apply a clock pulse to a 595, the bits in the Shift Register move one step to the left. Below is its code.FAQWhat is 74HC595?74HC595 is a shift register which works on Serial IN Parallel OUT protocol. It receives data serially from the microcontroller and then sends out this data through parallel pins. We can increase our output pins by 8 using the single chip.What is a 74hc595n?8-bit Shift Register 74HC595NA shift register is a chip you can use to control many outputs (8 here) at the same time while only using a few pins (3 here) of your Arduino.How does a shift register work?Shift registers hold the data in their memory which is moved or “shifted” to their required positions on each clock pulse. Each clock pulse shifts the contents of the register one bit position to either the left or the right.How 74HC595 Shift Regiester works?The 595 has two registers (which can be thought of as “memory containers”), each with just 8 bits of data. The first one is called the Shift Register. The Shift Register lies deep within the IC circuits, quietly accepting input.How does an 8 bit shift register work?The SN74HC595N is a simple 8-bit shift register IC. Simply put, this shift register is a device that allows additional inputs or outputs to be added to a microcontroller by converting data between parallel and serial formats. Your chosen microprocessor is able to communicate with the The SN74HC595N using serial information then gathers or outputs information in a parallel (multi-pin) format. Essentially it takes 8 bits from the serial input and then outputs them to 8 pins.What is a digital tube?Light emitting diode connects the anode together and then connected to the power of positive is called common anode digital tube, light emitting diode connected to the cathode and then connected to the power of the cathode is called common cathode digital tube.What is the difference between shift register and counter?In a shift register, the input of element N is the output of element N-1, and all elements use the same clock. In a counter, the input of element N is the inverse of its output, and the clock of element N+1 is the output of element N.