The Kynix Components

2N4401 is a commonly used NPN transistor possess some very good features in its small package.This transistor device is designed for use as a medium power amplifier and switch requiring collector currents up to 500 mA.In today's blog, we will talk about pinout, equivalent, datasheet and other information about 2N4401,  including where and how to use this device.Catalog2N4401 Pinout2N4401 Features2N4401 Applications2N4401 PNP Complementary2N4401 Test Circuit2N4401 Package2N4401 Functional EquivalentWhere to Use 2N4401How to Use 2N4401How to Safely Long Run 2N4401 in a Circuit2N4401 ManufacturerComponent Datasheet2N4401 PinoutPin NumberPin NameDescription1EmitterCurrent Drains out through emitter, normally connected to ground2BaseControls the biasing of transistor, Used to turn ON or OFF the transistor3CollectorCurrent flows in through collector, normally connected to load2N4401 FeaturesGeneral purpose NPN TransistorHigh DC Current Gain (hFE), typically 80 when IC=10mAContinuous Collector current (IC) is 500mACollector-Emitter voltage (VCE) is 40 VCollector-Base voltage (VCB) is 60VEmitter Base Breakdown Voltage (VBE) is 6VTransition Frequency is 100MHzAvailable in To-92 Package2N4401 ApplicationsSensor CircuitsAudio PreamplifiersAudio Amplifier StagesSwitching Loads under 500mAMotor speed controlDarlington PairsRF circuits under 250MHz2N4401 PNP ComplementaryPNP Complementary of 2N4401 is 2N44032N4401 Test Circuit2N4401 Package2N4401 Functional EquivalentPart NumberDescriptionManufacturer2N4401RLRM  TRANSISTORSSmall Signal Bipolar Transistor, 0.6A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, TO-92Motorola Semiconductor Products2N4401G  TRANSISTORS600mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, LEAD FREE, CASE 29-11, TO-226AA, 3 PINRochester Electronics LLC2N4401TFR_NL  TRANSISTORSSmall Signal Bipolar Transistor, 0.6A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, TO-92, LEAD FREE, TO-92, 3 PINFairchild Semiconductor Corporation2N4401RLRP  TRANSISTORS600mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, CASE 29-11, TO-226AA, 3 PINRochester Electronics LLC2N4401TFR  TRANSISTORS600mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, LEAD FREE, TO-92, 3 PINRochester Electronics LLC2N4401-AP  TRANSISTORSSmall Signal Bipolar Transistor, 40V V(BR)CEO, 1-Element, NPN, Silicon, TO-92, ROHS COMPLIANT, PLASTIC PACKAGE-3Micro Commercial Components2N4401J05Z  TRANSISTORS600 mA, 40 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, TO-92, 3 PINFairchild Semiconductor Corporation2N4401TAR  TRANSISTORSNPN Bipolar Junction Transistor, TO-92, 2000-FNFLDON Semiconductor2N4401_J61Z  TRANSISTORSSmall Signal Bipolar Transistor, 0.6A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, TO-92, LEAD FREE, TO-92, 3 PINFairchild Semiconductor Corporation2N4401RLRAG  TRANSISTORS600mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, LEAD FREE, CASE 29-11, TO-226AA, 3 PINRochester Electronics LLCWhere to Use 2N4401The 2N4401 transistor is very much similar to the commonly used NPN transistor 2N2222. But there are two important features that differentiate the 2N4401 and 2N222. 2N4401 can allow collector current upto 500mA only and also has power dissipation of 652mW,  which can be used to medium loads compared with 2N2222, but it can drive loads more than BC547.So if you looking for an NPN transistor that could switch loads or for decent amplification then 2N4401 might the right choice for your project.How to Use 2N4401This transistor like all can be used either as a switch or as an amplifier. The Base-Emitter voltage of this transistor is 6V,  so you just have to supply this voltage across the base and emitter of the transistor to induce a base current into the transistor. This transistor will make it forward biased and thus closes the connection between collector and emitter. However,  one important thing to notice is the base resistor a.k.a current limiting resistor. As the name suggests this resistor will limit the current flowing through the transistor to prevent it from damaging. The value for this resistor can be calculated using the formula:RB = VBE / IBTo make things simple,  I have shown a simplified circuit to make a transistor as switch. In actual circuit modifications might be required. I have used a base voltage of 5V and a value of 1K as current limiting resistor.Note that the motor here draws about 500mA from the 12V power source, since the 2N4401 has collector current rating upto 500mA this circuit is possible had it been a BC547 the transistor should have been burnt.How to Safely Long Run 2N4401 in a CircuitEvery transistor has limitations,  crossing these limitations will cause the device malfunction in your electronic circuit, so it is always recommended to use the transistors under their limitations defined by the manufacturers. To safely run the transistor, first,  do not operate it above 40V, and use a suitable base resistor to provide required base current, what's more, do not operate load above 500mA and always store or operate temperatures above -55 centigrade and below +150 centigrade.2N4401 ManufacturerON Semiconductor is driving energy efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power supply applications.Component Datasheet2N4401 NPN Transistor Datasheet

Executive Summary: 2026 Component ComparisonThe Verdict: For modern embedded systems in 2026, the 74HC595 remains the superior choice for general-purpose output expansion due to its integrated latching capability and CMOS efficiency.Vs. 74LS595: The LS series is effectively obsolete; use HC for lower power and wider voltage tolerance.Vs. 74HC164: Choose the 595 to prevent LED flickering (ghosting) during data shifting.Vs. MCP23017: Use the MCP23017 only when you need bidirectional I/O or I2C communication; otherwise, the 74HC595 is faster and cheaper.The 74HC595 remains one of the most ubiquitous shift registers in electronics engineering as of 2026. While it is a staple component, selecting the right alternative requires understanding the nuances of latching, protocols, and power consumption. In this updated engineering guide, we analyze the 74HC595 against its primary alternatives: the legacy 74LS595, the non-latched 74HC164, and the I2C-based MCP23017. We will determine interchangeable use cases and performance benchmarks for modern applications.What is the difference between 74HC595 and 74LS595?Direct Answer: The fundamental difference is the underlying technology; the 74HC595 uses modern High-speed CMOS (low power, flexible voltage), while the 74LS595 uses obsolete TTL (high power, fixed 5V).Component Datasheets (PDF)74HC595 Datasheet (Updated)74LS595 Datasheet (Legacy)74HC595 Technical OverviewThe 74HC595 is a high-speed CMOS 8-bit shift register with a storage register (latch) and 3-state outputs. It is fabricated with silicon gate C2MOS technology, allowing it to operate efficiently across a voltage range of 2V to 6V. Key Features:Architecture: 8-bit serial-in, parallel-out shift register feeding an 8-bit D-type storage register.Clocking: Separate clocks for the shift register and storage register (positive-edge triggered).Cascading: Includes a serial output (Q7S) for chaining multiple chips without signal degradation.74LS595 Technical Overview (Legacy)The 74LS595 is the older Low-power Schottky (LS) predecessor. While functionally similar regarding pinout logic, it is strictly bound to TTL logic levels (5V). It features the same 8-bit serial-in/parallel-out architecture with separate clocks. However, its bipolar transistor construction results in significantly higher quiescent current consumption compared to the HC series.Critical Comparison: HC vs. LS SeriesTechnology Standard: 74HC595 is CMOS based (Current Standard). It offers high noise immunity and low power consumption. The 74LS595 is TTL based (Obsolete BJT technology).Power Efficiency: CMOS technology (HC) draws near-zero static current, whereas TTL (LS) requires constant base current for its bipolar transistors, making LS unsuitable for battery-powered devices in 2026.Voltage Flexibility: The 74HC series operates typically between 2V and 6V, making it compatible with 3.3V microcontrollers (like ESP32/STM32). The 74LS series requires a strict 5V ±5% supply.Input Impedance: HC devices have high input impedance (requiring less drive current from the microcontroller), while LS devices have lower impedance, loading down the bus.Why choose 74HC595 over 74HC164? (Latching Explained)Direct Answer: The 74HC595 is superior for driving LEDs because it contains an output latch, whereas the 74HC164 outputs data immediately as it shifts, causing visible flickering or "ghosting."Component Datasheets74HC595 Datasheet74HC164 Datasheet74HC164 Operational BasicsThe 74HC164 is a simpler 8-bit serial-in/parallel-out shift register. It lacks the storage register found in the 595. Data enters serially through DSA or DSB. Crucially, the outputs (Q0-Q7) change state immediately on every LOW-to-HIGH transition of the clock (CP). There is no "holding" buffer.Key Differences: Buffer and ControlThe 74HC595 is generally preferred in modern circuit design for the following reasons:The Latch Factor (Visual Stability): The 74HC595 buffers data. You shift 8 bits in invisibly, then toggle the latch pin to update all outputs simultaneously. The 74HC164 shows every shift step on the output pins. If driving LEDs, the '164' creates a strobing effect as bits ripple through.Cascading Method: The 74HC595 uses a dedicated serial output pin (Q7') for cascading, leaving the parallel outputs unaffected. The 74HC164 requires sacrificing the last parallel output (Q7) to drive the next chip.Output Enable (OE): The 74HC595 features an Output Enable pin, allowing the microcontroller to turn off all outputs (High-Z) via software (useful for PWM brightness control). The 74HC164 lacks this feature.Reset Logic: 74HC595 reset clears the shift register but not the latch (unless re-latched). The 74HC164 Master Reset (MR) clears outputs immediately and asynchronously.Shift Register vs. IO Expander: 74HC595 or MCP23017?Direct Answer: Use the 74HC595 for high-speed, output-only tasks (like LED walls); use the MCP23017 when you need bidirectional pins (Input/Output) and prefer the I2C protocol to save microcontroller pins.Component Datasheets74HC595 DatasheetMCP23017 DatasheetMCP23017 Operational BasicsThe MCP23017 is a sophisticated 16-bit I/O Expander. Unlike a shift register, it functions as a peripheral device that communicates via the I2C bus. It provides 16 fully configurable GPIO pins that can act as inputs (with internal pull-ups) or outputs.Detailed Analysis: Speed vs. Flexibility1. DirectionalityThe 74HC595 is Output Only (Serial to Parallel). The MCP23017 is Bidirectional (can read buttons or sensors). 2. Interface SpeedShift registers (SPI-like) are extremely fast. You can pump data into a 74HC595 at 20MHz+ (hardware SPI). The MCP23017 uses I2C, which typically runs at 400kHz or 1.7MHz. For high-refresh-rate LED displays, the 74HC595 is the winner. 3. Pin Count efficiencyA 74HC595 requires 3 pins (Data, Clock, Latch). The MCP23017 requires 2 pins (SDA, SCL) and can share that bus with 100+ other sensors. If your microcontroller is pin-constrained, I2C is often better. Summary Recommendation:Driving LEDs/Relays? Use 74HC595. It is cheaper, faster, and easier to code.Reading Keypads/Sensors? Use MCP23017. It handles inputs and interrupts natively.{ "@context": "https://schema.org", "@type": "TechArticle", "headline": "74HC595 vs 74LS595 vs 74HC164 vs MCP23017: The Ultimate 2026 Comparison", "description": "A comprehensive engineering guide comparing the 74HC595 shift register against the 74LS595, 74HC164, and MCP23017 for modern embedded applications.", "datePublished": "2021-04-06", "dateModified": "2026-01-07", "image": "https://www.apogeeweb.net/upload/image/20210406/2021040617315025.jpg", "author": { "@type": "Organization", "name": "ApogeeWeb Electronics" }, "mainEntity": { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is the difference between 74HC595 and 74LS595?", "acceptedAnswer": { "@type": "Answer", "text": "The 74HC595 uses High-speed CMOS technology, which supports a wider voltage range (2V-6V) and consumes significantly less power than the older 74LS595, which uses TTL logic and is restricted to 5V." } }, { "@type": "Question", "name": "Why is the 74HC595 better than the 74HC164 for LEDs?", "acceptedAnswer": { "@type": "Answer", "text": "The 74HC595 includes an output storage latch. This allows data to be shifted in without affecting the outputs until the latch pin is triggered. The 74HC164 changes outputs immediately during shifting, causing visible flickering or ghosting on LEDs." } }, { "@type": "Question", "name": "When should I use an MCP23017 instead of a 74HC595?", "acceptedAnswer": { "@type": "Answer", "text": "Choose the MCP23017 if you need bidirectional pins (inputs and outputs), require interrupt capabilities, or need to save microcontroller pins by using the I2C bus. Use the 74HC595 for high-speed, output-only applications." } } ] }}

Product OverviewThe IR MOSFET family of power MOSFETs utilizes proven silicon processes offering designers a wide portfolio of devices to support various applications such as DC motors, inverters, SMPS, lighting, load switches as well as battery powered applications.The devices are available in a variety of surface mount and through-hole packages with industry standard footprints for ease of design. This blog will introduce LM3900 systematically from its features, pinout to its specifications, applications, also including LM3900 datasheet and so much more. Video: IRF640N Mosfet controls led via buttons on off CatalogProduct OverviewIRF640N FeaturesIRF640N BenefitsIRF640N PinoutIRF640N Circuit DiagramIRF640N Test CircuitsReplacements and Equivalents of IRF640NIRF640N SpecificationsIRF640N ManufacturerIRF640N DatasheetUsing WarningsIRF640N FAQ IRF640N FeaturesPlanar cell structure for wide SOAOptimized for broadest availability from distribution partnersProduct qualification according to JEDEC standardSilicon optimized for applications switching below <100kHzIndustry standard through-hole power packageHigh-current rating IRF640N BenefitsIncreased ruggednessWide availability from distribution partnersIndustry standard qualificationHigh performance in low frequency applicationsStandard pin-out allows for drop-in replacementHigh current capability IRF640N PinoutThe following figure is the diagram of IRF640N pinout. IRF640N Pinout IRF640N Circuit DiagramFollowing is the circuit diagram of IRF640N. IRF640N Light Control Circuit IRF640N Test Circuits Following are the diagrams of testing IRF640N circuit. Unclamped Energy Test Circuit Gate Charge Test Circuit Switching Time Test Circuit Replacements and Equivalents of IRF640NYou can replace the IRF640N with the IRFB23N20D, IRFB260N, IRFB31N20D, IRFB38N20D, IRFB4127, IRFB4227, IRFB4229, IRFB4233, IRFB42N20D, IRFB4332 IRF640N SpecificationsParametricsIRF640NID (@25°C)   max18.0 AMountingTHTPtot max150.0 WPackageTO-220PolarityNQG (typ @10V)44.7 nCQgd22.0 nCRDS (on) (@10V)   max150.0 mΩRthJC max1.0 K/WTj max175.0 °CVDS max200.0 VVGS(th) min max3.0 V 2.0 V 4.0 VVGS max20.0 V IRF640N ManufacturerInternational Rectifier was an American power management technology company manufacturing analog and mixed-signal ICs, advanced circuit devices, integrated power systems, and high-performance integrated components for computing. On 13 January 2015, the company became a part of Infineon Technologies. IRF640N DatasheetYou can download this datasheet for IRF640N–Datasheet from the link given below:IRF640N Datasheet Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. IRF640N FAQWhat are power MOSFETs used for?Power MOSFETs (Metal-Oxide Semiconductor Field Effect Transistors) are three-terminal silicon devices that function by applying a signal to the gate that controls current conduction between source and drain. What are N-channel MOSFETs?Channel MOSFET is a type of metal oxide semiconductor field-effect transistor that is categorized under the field-effect transistors (FET). MOSFET transistor operation is based on the capacitor. ... These transistors also consist of three terminals which referred to as the source, drain, and the gate. How does MOSFET work?It works by varying the width of a channel along which charge carriers flow (electrons or holes). The charge carriers enter the channel at source and exit via the drain. The width of the channel is controlled by the voltage on an electrode is called gate which is located between source and drain. How do I know if my MOSFET is 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. What causes MOSFET failure?If the maximum operating voltage of a MOSFET is exceeded, it goes into Avalanche breakdown. If the energy contained in the transient over-voltage is above the rated Avalanche energy level, then the MOSFET will fail. The device fails short circuit, initially, with no externally visible signs. Why N channel is better than P channel MOSFET?The N-Channel MOSFET has the higher packing density which makes it faster in switching applications due to the smaller junction areas and lower inherent capacitance. The N-channel MOSFET is smaller for the same complexity than P-channel device. Is MOSFET current controlled?MOSFET Drive Circuits. The power MOSFET is a voltage-controlled device. By providing a positive voltage to the gate, with respect to the source, current will be made to flow in the drain. Reducing the voltage to zero will turn the drain current off. How do you identify a MOSFET?The MOSFETs are the slightly smaller SC-72 package. The polarity of these devices is important, and usually referenced by pin number. To identify the pins, hold the device so that the marking side is factng you, and the legs are pointing downwards. Why is my MOSFET getting hot?Defective component; Heater draws too much current for the particular MOSFET you are using; or. The MOSFET is functioning normally, but it needs a heat sink due to significant power dissipation. How can I stop my MOSFET from overheating?Generally speaking, a MOSFET passing high current will heat up. Poor heat sinking can destroy the MOSFET from excessive temperature. One way of avoiding too-high current is to parallel multiple MOSFETs so they share load current. 

I DescriptionThe switching power supply chip LM2596 is compact, low-cost, low-power, high-efficiency and easy to use compared with specialized instruments. The power supply described in this blog is a stepless adjustable DC regulated voltage supply based on the switching power supply chip LM2596.Figure 1. LM2596CatalogI DescriptionII LM2596 Circuit and Design Process2.1 Circuit of Stepless Adjustable DC Power Supply2.2 Design Process of Adjustable DC Voltage SourceIII How to Apply and Use LM2596 Stepless Adjustable DC Power Supply3.1 How to Apply?3.2 How to Use?FAQOrdering & QuantityII LM2596 Circuit and Design Process2.1 Circuit of Stepless Adjustable DC Power SupplyThis power supply circuit mainly uses LM2596-ADJ. LM2596-ADJ is a step-down switching power supply chip. Its output voltage range is 1.2V-37V, and its maximum load current is 3A, with excellent linearity and load regulation characteristics. Only 4 external components are needed in the main circuit to adjust the output voltage. The LM2596-ADJ chip integrates frequency compensation and a fixed frequency generator, and the switching frequency is 150KHz, which facilitates the use of smaller filter components, thereby reducing volume, weight, loss and cost. Under certain input voltage and output load conditions, the output voltage error is within 4%, the oscillation frequency error range is within 15%, and the standby current can be only 80uA. It can realize external power-off and has a self-protection circuit (a two-stage frequency reduction current-limiting protection circuit and an over-temperature complete protection circuit that is cut off in abnormal cases). The LM2596-ADJ package in this article is TO220(T), which requires an external heat sink.　VOUT=1.23V*(1+R2/R1)When designing the PCB board, the external components should be as close as possible to the LM2596-ADJ, and use ground wire shielding or single-point grounding, and use magnetic shielding inductors. If the inductor core used is open, and the inductance flux crosses the sensitive feedback line, the ground line of the integrated chip and the connection of the output capacitor COUT may have problems. The feedback resistor should be close to the LM2596-ADJ IC, and the related wiring should be far away from the inductor.　　Figure 2. Adjustable DC Voltage Source Circuit2.2 Design Process of Adjustable DC Voltage SourceVOUT is the adjustable output voltageVIN(max) is the maximum DC input voltage,ILOAD(max) is the maximum load current,F=switching frequency (150KHz)1) Output Voltage Calculation　　VOUT=VREF*(1+R2/R1)Among them, VREF=1.23V. In this blog, R1 is a 1KΩ metal film resistor with a lower temperature coefficient of 1% accuracy; R2 uses a 30KΩ potentiometer.2) Inductor SelectionCalculate the product E*T of the inductor voltage and microseconds by the following formula:　　E*T=(VIN-VOUT-VSAT)*(VOUT +VD)/(VIN-VSAT+VD)*1000/150KHz (V· uS)VSAT is the internal saturation voltage of the switch, VSAT=1.16VVD is the forward voltage drop of the diodeVD=0.5VUse the E*T value in the formula to find the matching inductor number from the ordinate in Figure 3, and select the maximum load current of the circuit on the abscissa; determine an inductance area by the intersection of the E*T value, and the maximum load current,and each area is corresponding to an inductance value and an inductance serial number (LXX).  Select the appropriate inductor from the component number of the manufacturer listed in Table 1 for LM2596-ADJ circuit, preferably a magnetic shield inductor. This blog chooses 68uH inductance.　　Figure 3. LM2596-ADJ Application Information3) Output Capacitor COUTNumber/ Inductance(μH)/ Current (A)SchottRencoPulse EngineeringCoilcraftIn-LineSurface MountIn-LineSurface MountIn-LineSurface MountSurface MountL15/22/0.996714835067148460RL-1284-22-43RL 1500-22PE-53815PE-53815-SDO3308-223L21/68/0.996714407067144450RL-5417-5RL 1500-68PE-53821PE-53821-SDO3316-683L22/47/1.176714408067144460RL-5417-6-PE-53822PE-53822-SDO3316-473L23/33/1.406714409067144470RL-5417-6-PE-53823PE-53823-SDO3316-333L24/22/1.706714837067148480RL-1283-22-43-PE-53824PE-53825-SDO3316-223L25/15/2.106714838067148490RL-1283-15-43-PE-53825PE-53824-SDO3316-153L26/330/0.806714410067144480RL-5471-1-PE-53826PE-53826-SDO5022P·334L27/220/1.006714411067144490RL-5471-2-PE-53827PE-53827-SDO5022P·224L28/150/1.206714412067144500RL-5471-3-PE-53828PE-53828-SDO5022P·154L29/100/1.476714413067144510RL-5471-4-PE-53829PE-53829-SDO5022P·104L30/68/1.786714414067144520RL-5471-5-PE-53830PE-53830-SDO5022P·683L31/47/2.206714415067144530RL-5471-6-PE-53831PE-53831-SDO5022P·473L32/33/2.506714416067144540RL-5471-7-PE-53932PE-53832-SDO5022P·333L33/22/3.106714439067144500RL-1283-22-43-PE-53933PE-53833-SDO5022P·223L34/15/3.406714440067144790RL-1283-15-43-PE-53934PE-53834-SDO5022P·153L35/220/1.7067144170-RL-5473-1-PE-53935PE-53835-S-L36/150/2.1067144180-RL-5473-4-PE-54036PE-53836-S-L37/100/2.5067144190-RL-5472-1-PE-54037PE-53837-S-L38/68/3.1067144200-RL-5472-2-PE-54038PE-53838-S-L39/47/3.5067144210-RL-5472-3-PE-54039PE-53839-S-L40/33/3.506714422067148290RL-5472-4-PE-54040PE-53840-S-L41/22/3.506714423067148300RL-5472-5-PE-54041PE-53841-S-L42/150/2.7067144410-RL-5473-4-PE-54042PE-53842-S-L43/100/3.4067144240-RL-5473-2-PE-54043 -L44/68/3.4067144250-RL-5473-3-PE-54044 -　　Table 1. Product model of an inductor manufacturerIn most cases, we can use low equivalent resistance electrolytic capacitors or solid tantalum capacitors between 82uF~820uF. When in use, the capacitor should be close to the for LM2596-ADJ IC, and the pins and connecting copper wires should be as short as possible.See Table 2 below. In order to simplify the selection of capacitors, Table 1 contains the different output voltages and output capacitors required for the best design. The withstand voltage of the capacitor is at least 5 times the output voltage. Sometimes, in order to obtain a lower ripple output voltage, a higher capacitor withstand voltage value is required. This blog chooses 220uF/50V electrolytic capacitors.VOUTIn-Line CapacitorSurface Mount CapacitorPANASONIC HFQ(μF/V)NICHICON PL(μF/V)Feedforward CapacitorAVX TPS(μF/V)VISHAY 595D(μF/V)Feedforward Capacitor2820/35820/3533nF330/6.3470/433nF4560/35470/3510nF330/6.3390/6.310nF6470/25470/253.3nF220/10330/1033nF9330/25330/251.5nF100/16180/161.5nF12330/25330/251nF100/16180/161nF15220/35220/35680 pF68/20120/20680 pF24220/35150/35560 pF33/2533/25220 pF28100/50100/50390 pF10/3515/50220 pF　　Table 2. Output Capacitor and Feedforward Capacitor Selection 4) Feedforward Capacitor CFFWhen the output voltage is large, a compensation capacitor with a typical value between 100pF and 33nF is required, which is connected in parallel with the output voltage adjustment resistor R2. Its function is to compensate the feedback loop and increase the phase margin to improve the stability of the loop. For high output voltage, low input-output voltage and/or low equivalent resistance output capacitors, this capacitor makes the circuit more stable, such as solid tantalum capacitors. The selection still refers to the corresponding feedforward capacitor value in Table 1. This blog chooses 33nF ceramic capacitors.　　CFF=1/(31*1000*R2)This capacitor can be a ceramic capacitor, plastic or mica capacitor.5) Zener Diode (D1) SelectionThe maximum current capacity of the Zener diode is at least 1.3 times the maximum load current. If the designed power supply is to withstand continuous short-circuit output, the maximum current capacity of the Zener diode is equal to the limit output of LM2596 Current. Its function is to provide a path for the inductor current when the switch is closed. The reverse voltage of the Zener diode is at least 1.25 times the maximum output voltage; the Zener diode must be a fast recovery diode and must be close to the LM2596-ADJ IC. At the same time, the pins and the connected copper wires should be short. Therefore, we should first choose Schottky diodes. This blog chooses 1N5825 Schottky diode here.6)Input Capacitance CINThe input capacitor is an electrolytic capacitor or tantalum capacitor with a low equivalent resistance, which is also close to the IC, and the DC load current must exceed twice the root mean square of the input capacitor current. For aluminum electrolytic capacitors, the maximum input voltage is 2/3 of the withstand voltage; for tantalum capacitors, select capacitors that the manufacturer has tested for surge current. We can select the appropriate input capacitance according to the graph shown. This capacitor prevents excessive transient voltage from appearing at the input, and at the same time provides transient current for LM2596-ADJ every time it switches. This blog uses 680uF/50V electrolytic capacitors.VROutput Current: 3AOutput Current: 4A~6ALnlineSurface MountLnlineSurface MountSchottkySuper Fast RecoverySchottkySuper Fast RecoverySchottkySuper Fast RecoverySchottkySuper Fast Recovery20V The minimum withstand voltage of all such diodes is 50V MURS32030WF10IN5820The minimum withstand voltage of all such diodes is 50V MURS320 The minimum withstand voltage of all such diodes is 50V MURS62050WF10SR502The minimum withstand voltage of all such diodes is 50V MURS620HER601SK32SR302 IN5823 MBR320 SB52030V30WQ03IN5821  SK33MBR33050WQ03SR503 31DQ03 IN582440V IN5822 SB530SK34SR30450WQ04SR504MBRS340MBR340 IN582530WQ0431DQ04 SB54050V or HigherSK35SR305  MBRS360MBR35050WQ05SB55030WQ0531DQ05 50SQ080　Table 3. Choice of Diode　　Figure 4. LM2596-ADJ application informationIII How to Apply and Use LM2596 Stepless Adjustable DC Power Supply3.1 How to Apply?The device can be used as a power supply that requires a DC voltage source kit: radio power supplydoorbell power supplyalarm power supplypower amplifier power supply51 single-chip power supply, etc.3.2 How to Use?The anode of the output end (red alligator clip) is connected to the anode of the circuit, and the cathode of the output end (black alligator clip) is connected to the cathode of the circuit. Plug the 220V power cord into the mains socket. Turn on the power switch, the DC voltage source indicator (red) will light up, adjust the knob to output the voltage change, and its value will be displayed on the voltmeter head.FAQWhat is lm2596?The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation.What is the difference between LM2596 and LM2595?LM2596: The highest output current is 3A, 1PIN-VOUT, 2PIN-VIN;LM2595: The highest output current is 1A, 1PIN-VIN, 2PIN-VOUT.What is the voltage of each pin of LM2596-12? What is the function of each pin?Pin 1 is the input terminal, 12V, the normal working voltage range should be 14V~37V under the output condition; pin 2 is the output terminal, here is the high-frequency oscillation output, not DC voltage, so there is no definite voltage; pin 3 is grounded, 0V ; Pin 5 is the enable control terminal, LM2596 works normally when connected to a low level, and no output is turned off when connected to a high level, usually directly grounded; Pin 4 is the feedback control signal input terminal, connected to the middle connection point of the proportional resistor, where the voltage It is proportional to the actual output.Can LM2596 output negative voltage?LM2596 can output negative voltage.LM2596 has different application circuits, which can output positive voltage or negative voltage, but it has no boost function, and the absolute value of its output voltage must be less than the absolute value of the input voltage.In the circuit with adjustable output voltage of lm2596, can the output voltage be greater than the input voltage?The LM2596 switching voltage regulator is a step-down power management monolithic integrated circuit, which can output 3A drive current and has good linearity and load regulation characteristics. The output voltage will not be greater than the input voltage. If the output voltage is greater than the input voltage, it is best to use a step-up power chip. Such as XL6009, VT1050.After reading the blog, have you better understand LM2596?Finally, if you have any questions about LM2596, please do not hesitate to leave a message in the comment section below!

I IntroductionThe audio power amplifier is a key part of the audio system, which has been widely used in daily life and has strong practicability. However, there is still no suitable voice power amplifier in some occasions. Such as large classrooms for classes, medium-sized conference rooms for meetings, small square gatherings, and other occasions.This blog introduces a simple and low-cost audio amplifier circuit based on NE5532. This circuit overcomes the problem of the high cost of professional equipment and the problem of insufficient power of low-end voice amplifiers on the market. Therefore, it has important research significance for satisfying actual study work.CatalogI IntroductionII System Overall DesignIII System Hardware Design3.1 Band Pass Filter Circuit3.2 Primary Power Amplification3.3 Post-stage Power Amplification3.4 DC Power Supply3.5 Schematic Diagram and Physical Diagram3.6 Test DataIV ConclusionFAQOrdering & QuantityII System Overall DesignThe audio amplifier circuit is mainly composed of the following parts: Band-pass filter circuit; Primary power amplifier circuit;Post-stage power amplifier circuit, DC stabilized power supply;...Its principle block diagram is shown as in Fig. 1.Figure 1. Circuit Block DiagramIII System Hardware Design3.1 Band Pass Filter CircuitThe main function of the band-pass filter circuit is to pre-process the audio signal. This can make it more in line with the requirements of the power amplifier circuit. The band-pass filter circuit uses resistors and capacitors to filter, the effect is stable and easy to debug. It is mainly composed of two parts: channel balance circuit and tone control circuit.The concrete circuit is shown as in Fig. 2.Figure 2. Band Pass Filter Circuit3.1.1 Channel Balance CircuitThe sliding rheostat R1 in Figure 2 acts as an equalizer to balance the size of the left and right channels. The middle pin of the sliding rheostat is connected to the ground and a capacitor C1 is connected in parallel. The function of this capacitor is to filter out high frequency signals in high input audio.3.1.2 Tone Control CircuitThe tone control circuit enables the listener to boost or attenuate certain frequency bands of the sound according to their needs. The multi-band tone circuit used in this blog. In this way, the incoming audio signal enters the middle, low, and high audio control circuit to adjust and then superimposes it into the power amplifier circuit. So that the corrected frequency response is more detailed and the effect is better.(1) Treble ControlThe rheostat R5 and surrounding components form a high-pitched tone circuit. Capacitor C3 can pass high-frequency signals. The treble signal increases when the rheostat slides up, and the treble signal decreases when it slides down.(2) Midrange ControlThe rheostat R8 and surrounding components constitute a mid-tone tuning circuit. Some high-frequency signals in the circuit are filtered out through components such as R7, C4, and R9. C5 can pass intermediate frequency signals in audio. The mid-audio signal increases when the rheostat R8 slides up, and the mid-audio signal decreases when it slides down.(3) Bass ControlThe rheostat R12 and surrounding components form a bass tuning circuit. The audio signal enters R12 to adjust its amplitude. Then, superimpose the adjusted treble and midrange into the power amplifier circuit. In this way, a complete high, middle and low tone circuit can be formed.3.2 Primary Power AmplificationThe primary power amplifier consists of NE5532. NE5532 is a high-performance low-noise dual op amp. It has good noise performance, excellent output drive capability and quite high small signal and power bandwidth. When NE5532 is used for audio amplification, the tone is warm and high fidelity. The circuit is shown in Figure 3.　　Figure 3. Part of NE5532 CircuitHere, the magnification is controlled by R14 and R15. Because there is a post-stage power amplification in the circuit, this stage is amplified to ensure sound quality. We set R14 as 1kΩ and R15 as 10kΩ, which is 10 times. R16 and C8 form a negative feedback circuit. Adjusting R16 and C8 in the circuit can make the sound quality softer, clearer, and more transparent. After repeated debugging, it can be determined that R16 is set to 1MΩ, and C8 is set to 33μF, which achieves their satisfactory results.3.3 Post-stage Power AmplificationThe post-stage power amplifier circuit is composed of two parts: a differential amplifier circuit and a composite tube amplifier circuit. Among them, the composite tube amplifier circuit uses high-power transistor 2N3055. The concrete circuit is shown as in Fig. 4.　Figure 4.  Post-stage Power Amplification3.4 DC Power SupplyThis circuit turns the mains power into a unidirectional direct current through a bridge rectifier circuit. The pulsating component has to go through a filter circuit to become a smooth direct current. Finally, the circuit is stabilized into ±12V direct current through 7812 and 7912 voltage stabilizers and supplied to the load. The power circuit is shown as in Fig. 5.Figure 5. DC Power Supply Circuit3.5 Schematic Diagram and Physical DiagramThe overall schematic diagram and physical diagram of the voice amplifier circuit are shown in Figure 6 and Figure 7.Figure 6. Overall Principle Diagram of Audio Amplifier CircuitFigure 7. Audio Amplifier 3.6 Test DataAfter our repeated debugging of the audio amplifier circuit, we finally achieved a relatively satisfactory effect. The test data is shown in Table 1.Table 1. Test Data of Audio Amplifier CircuitIV ConclusionAfter theoretical analysis and practical testing, the audio amplifier circuit based on NE5532 is simple and stable, with a maximum output power of 40W. Compared with the current mainstream integrated circuit voice amplifier, it has the characteristics of low heat generation, good stability, low cost and high power. Therefore, it has better use value.FAQWhat is NE5532？The NE5532 is a Dual Low Noise Op-Amp in 8-pin package commonly used as amplifiers in audio circuits for its noise immunity and high output drive capability. The Op-Amp is internally compensated for high unity gain with maximum output swing bandwidth, low distortion and high slew rate.How to check NE5532 IC with digital multimeter?Whats the size of NE5532 produced by Texas Instruments? Anything to compare?You will find all physical sizes in inches as well as millimeters in page 19 of the official TI datasheet at:http://www.ti.com/lit/ds/symlink/ne5532.pdfWhat are the features of NE5532?NE5532 is similar to many standard operational amplifiers, but it has the characteristics of better noise performance, excellent output drive capability, high small signal bandwidth, and large power supply voltage range. Therefore, NE5532 is very suitable for high-quality and professional audio equipment, instruments, control circuits and telephone channel amplifiers.What is a key part of the audio system?Audio power amplifierWhat is the problem with NE5532?High cost of professional equipment 

Product OverviewThe TIP32C is a silicon Epitaxial-base PNP power transistor in Jedec TO-220 plastic package. It is intended for use in medium power linear and switching applications. The complementary NPN type is TIP31C.This blog will introduce TIP32C systematically from its features, pinout to its equivalents, application, also including where and how to use this component and so much more. CatalogProduct OverviewTIP32C FeaturesTIP32C PinoutsTIP32C CAD ModelsTIP32C Replacement and EquivalentWhere We Can Use TIP32C & How to UseHow to Safely Long Run TIP32C in a CircuitTIP32C ApplicationsTIP32C SpecificationTIP32C VS TIP36CTIP32C DatasheetTIP32C ManufacturerUsing WarningsTIP32C FAQ TIP32C FeaturesCollector-Emitter Saturation Voltage       - VCE(sat) = 1.2 Vdc (Max) @ IC = 3.0 AdcCollector-Emitter Sustaining Voltage      -VCEO(sus) = 60 Vdc (min) - TIP31A, TIP32A      =80 Vdc (min) - TIP31B, TIP32B      =100 Vdc (min) - TIP31C, TIP32CHigh Current Gain Bandwidth Product      fT = 3.0 MHz (min) @ IC = 500 mAdcCompact TO-220 AB PackagePb-Free Packages are Available TIP32C PinoutsFollowing are TIP32C Pinouts. TIP32C Pinouts TIP32C CAD ModelsFollowings are TIP32C Symbol, Footprint, and 3D Model. TIP32C Symbol TIP32C Footprint TIP32C 3D Model TIP32C Replacement and EquivalentTIP32C transistor nearest possible equivalents are CJF32C, TIP32D, BD582, BD592, BDT32C 2N6475 2N6476, 2SB1016, MJE30C, MJE32C, MJE5195, NSP582, NSP5195, RCA30C, RCA32C, TIP62A, TIP62B, TIP62C, 2SB761B, 2SB762B, 2SB860, 2SB869, 2SB945, BD242C, BD540C, BD954, ECG292. Additionally, if the load you are driving is under 40V or 80V then you can also use exact match transistors which are TIP32A, TIP32B, these are the exact same replacement but in lower voltages like TIP32A can drive loads under 60V and TIP32B can drive loads under 80V. Where We Can Use TIP32C & How to UseTIP32C can be used in many general applications. When used as a switch it is capable to drive 3A load therefore it can be used to drive DC motors, LEDs, relays, bulbs, and also at the output of Arduino, raspberry pi, and other platforms. Other than that it can also be used for much general audios and other signal amplification requirements. How to Safely Long Run TIP32C in a CircuitHTo get long-life performance from the TIP32C transistor, do not drive load more than 3A and 100V (The rule of thumb is always stay 20% below the maximum ratings). Always use a suitable heatsink, the collector is also connected with the metal tab therefore care must be taken when using in your design or circuit that the metal tab would not touch any other connection or else it can short or damage the transistor. And always store or operate in temperature between -65 centigrade to +150 centigrade. TIP32C ApplicationsSeparate Audio AmplifierAudio Amplifier StagesFor Handling 3A LoadDC Motors Driver and ControllerDarlington PairsOutput of Arduino, Raspberry Pi and other Electronic Platforms TIP32C SpecificationProduct AttributeAttribute ValueManufacturer:STMicroelectronicsProduct Category:Bipolar Transistors - BJTMounting Style:Through HolePackage / Case:TO-220-3Transistor Polarity:PNPConfiguration:SingleCollector- Emitter Voltage VCEO Max:100 VCollector- Base Voltage VCBO:- 100 VEmitter- Base Voltage VEBO:- 5 VCollector-Emitter Saturation Voltage:- 1.2 VMaximum DC Collector Current:3 APd - Power Dissipation:40 WGain Bandwidth Product fT:3 MHzMinimum Operating Temperature:- 65 CMaximum Operating Temperature:+ 150 CSeries:TIP32CPackaging:TubeHeight:9.15 mmLength:10.4 mmTechnology:SiWidth:4.6 mmBrand:STMicroelectronicsContinuous Collector Current:3 AProduct Type:BJTs - Bipolar TransistorsSubcategory:TransistorsUnit Weight:0.211644 oz TIP32C VS TIP36C TIP32C TIP36CPart Life Cycle CodeActiveTransferredIhs ManufacturerMICRO COMMERCIAL COMPONENTSMOTOROLA INCPart Package CodeTO-220AB Package DescriptionPLASTIC, TO-220, 3 PINFLANGE MOUNT, R-PSFM-T3Pin Count3 Reach Compliance CodecompliantunknownECCN CodeEAR99EAR99Collector Current-Max (IC)3 A25 ACollector-Emitter Voltage-Max100 V100 VConfigurationSINGLESINGLEDC Current Gain-Min (hFE)1015JEDEC-95 CodeTO-220ABTO-218ACJESD-30 CodeR-PSFM-T3R-PSFM-T3JESD-609 Codee0e0Moisture Sensitivity Level1 Number of Elements11Number of Terminals33Package Body MaterialPLASTIC/EPOXYPLASTIC/EPOXYPackage ShapeRECTANGULARRECTANGULARPackage StyleFLANGE MOUNTFLANGE MOUNTPeak Reflow Temperature (Cel)NOT SPECIFIED Polarity/Channel TypePNPPNPQualification StatusNot QualifiedNot QualifiedSurface MountNONOTerminal FinishTin/Lead (Sn/Pb)Tin/Lead (Sn/Pb)Terminal FormTHROUGH-HOLETHROUGH-HOLETerminal PositionSINGLESINGLETime@Peak Reflow Temperature-Max (s)NOT SPECIFIED Transistor Element MaterialSILICONSILICONTransition Frequency-Nom (fT)3 MHz3 MHzBase Number Matches5425 TIP32C DatasheetTIP32C Datasheet TIP32C ManufacturerSTMicroelectronics is the result of the 1987 marriage between famed semiconductor companies SGS Microelettronica of Italy and Thomson-CSF Semiconductor of France. On the process side ST is leading the way with advanced FD-SOI (Fully Depleted Silicon-on-Insulator) technology. Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. TIP32C FAQ① What is the work of PNP transistor?The PNP transistor is a type of transistor in which one n-type material is doped with two p-type materials. It is a device that is controlled by the current. Both the emitter and collector currents were controlled by the small amount of base current. Two crystal diodes are connected back-to-back in the PNP transistor. ② Can I use TIP31C instead of TIP32C?In such a case the output of the sensor is normally low and becomes high when the hand is detected so in such a case you will have to use a NPN transistor like TIP31C instead of TIP32C. ③ Where are PNP transistors used?PNP transistors are used in amplification circuits. PNP transistors are used in Darlington pair circuits. PNP transistors are used in robotic applications. PNP transistors to control current flow in heavy applications. ④ What is the function of TIP32C transistor?The TIP32 is a PNP Power transistor. Since it has high collector current of about 2A it can be used for Power switching or large signal amplification. The transistor is mainly known for its high amplification capacity since 2A is not much of a higher capacity. ⑤ What is the operating junction temperature of tip32c?Operating Junction Temperature (Tj): 150 °C