You can often see the IRF740 MOSFET in high-voltage switching and power control. This n-channel power MOSFET can handle up to 400 volts and 10 amps. As an n-channel MOSFET, it works well in many things like power supplies and motor drivers. You should read the irf740 datasheet to know its limits and how to use it safely. The irf740 datasheet gives you important details about the pinout and circuit design. Knowing how to pick a replacement or equivalent n-channel power mosfet helps you make circuits that work well.
Key Takeaways
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The IRF740 is a strong n-channel MOSFET. It can handle up to 400 volts and 10 amps. This makes it good for high-power switching jobs.
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It switches quickly with low gate charge and low on-resistance. This helps circuits work well and stay cool.
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Always look at the IRF740 datasheet for pinout, ratings, and limits. This helps you connect it right and keep your circuit safe.
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You can swap the IRF740 with other MOSFETs like the IRFP740. But always match the voltage, current, and package type.
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Use the IRF740 in power supplies, motor drivers, battery chargers, and LED dimmers. Protect it with heat sinks and diodes if needed.
IRF740 MOSFET Overview
Key Features
The irf740 mosfet is made for hard work. It can handle high voltage and big current. You use it when you need fast switching and strong power. Here is a table that lists the main features:
| Parameter | Value |
|---|---|
| Continuous Drain Current (Id) | 10 A |
| Maximum Drain-Source Voltage (Vds) | 400 V |
| On-Resistance (Rds(on)) @ Vgs=10V | ~0.54 Ω |
| Maximum Gate-Source Voltage (Vgs) | ±20 V |
| Power Dissipation (Pd) | 125 W |
The irf740 has some important qualities:
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It has low gate charge, so it switches fast and easy.
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It has low input capacitance, which helps your circuit react quickly.
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It switches fast, so it works well at high frequencies.
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It is 100% avalanche tested, so it is tough and dependable.
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It has better dv/dt ability, so it handles voltage changes well.
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Its n-channel design is good for switching high current.
These features make the irf740 a good pick for hard jobs.
Typical Uses
You can find the irf740 mosfet in many devices. It is used in circuits that need to control high voltage or current. Here are some ways people use it:
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Power supplies, where you need to move a lot of power.
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Motor drivers, which help you change how motors run.
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Inverters and converters, which change AC to DC or the other way.
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Battery chargers, which need safe and good power control.
Tip: If you want a strong and fast power mosfet, the irf740 is a good choice.
The irf740 is used in many projects because it is strong and keeps circuits safe.
IRF740 Datasheet
Specifications Table
You need to know the main details before you use the IRF740 in your project. The irf740 datasheet gives you all the important numbers. This helps you make sure the MOSFET fits your needs. Here is a table that shows the key irf740 specification values:
| Parameter | Value |
|---|---|
| Maximum Drain-Source Voltage | 400 V |
| Maximum Continuous Drain Current | 10 A |
| Power Dissipation | 125 W |
| On-Resistance (R_DS(on)) @ Vgs=10V | 0.54 – 0.55 Ω |
| Maximum Gate-Source Voltage | ±20 V |
| Package Type | TO-220-3 / TO-220AB |
| Mounting Type | Through Hole |
| Number of Pins | 3 |
| Height | 9.01 mm |
| Length | 10.41 mm |
| Width | 4.7 mm |
You can see that the irf740 mosfet can handle high-power jobs. The irf740 datasheet shows that it works with up to 400 volts and 10 amps. The power dissipation of 125 watts means you can use it in circuits that need to move a lot of energy. The TO-220 package makes it easy to mount on a heat sink for better cooling.
Main Ratings
When you look at the irf740 specification, you notice some important ratings. These ratings help you decide if this MOSFET is right for your high-power circuit.
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The typical R_DS(on) value is about 0.54 to 0.55 ohms. You get this value when you use a gate-source voltage of 10 volts. This low resistance means less heat and better efficiency.
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The irf740 can switch on and off very fast. This makes it great for circuits that need quick changes, like power supplies and motor drivers.
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The datasheet also shows that the irf740 can handle high voltage and high current at the same time. This is important for high-power switching.
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The TO-220 package type is strong and easy to use. You can solder it onto a board or attach it to a heat sink.
Note: Always check the irf740 datasheet before you use it in your design. This helps you avoid mistakes and keeps your circuit safe.
The irf740 specification tells you that this MOSFET is made for high-power switching. You can use it in many projects, from power supplies to motor control. The datasheet gives you all the numbers you need to make smart choices.
IRF740 Pinout
Pin Diagram
When you work with the IRF740, you need to know its pinout. The IRF740 pinout follows the standard layout for a TO-220 package. This makes it easy to identify each pin and connect the MOSFET correctly in your circuit. You can see the pinout diagram below:
| Pin Number | Name | Description |
|---|---|---|
| 1 | Gate | Control Input |
| 2 | Drain | Output |
| 3 | Source | Ground/Return Path |
The IRF740 pinout diagram helps you avoid mistakes when wiring your project. Always check the pin numbers before you solder or plug the MOSFET into your board.
Tip: Hold the IRF740 so you face the flat side with the writing. The pins from left to right are Gate, Drain, and Source.
Pin Functions
You need to understand the IRF740 pin configuration to use this MOSFET safely and effectively. Each pin has a special job in your circuit:
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Gate (G): This pin acts as the control input. When you apply a voltage here, you turn the MOSFET on or off. The gate does not draw much current, so you can control it with a microcontroller or other logic circuit.
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Drain (D): This pin is where the main current leaves the MOSFET. You connect the load, such as a motor or lamp, to the drain. When the MOSFET turns on, current flows from the source to the drain.
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Source (S): This pin is the return path for current. You usually connect the source to ground in most circuits.
The IRF740 pin configuration is important for high-power switching, amplification, and motor control. You must connect each pin to the right part of your circuit. The gate controls the flow of current between the source and drain. If you mix up the pins, your circuit will not work, and you might damage the MOSFET.
The TO-220 package makes it easy to mount the IRF740 on a heat sink. This helps keep the MOSFET cool during heavy use. Always double-check the IRF740 pinout before you power up your project.
Technical Details
Maximum Ratings
You need to know the maximum ratings of the IRF740 to keep your circuit safe. These ratings tell you the highest limits the MOSFET can handle before it gets damaged. If you go over these numbers, you risk breaking the part.
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Drain-Source Voltage (Vds): 400 V
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Continuous Drain Current (Id): 10 A
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Pulsed Drain Current (Id,pulse): 40 A
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Gate-Source Voltage (Vgs): ±20 V
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Power Dissipation (Pd): 125 W
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Operating Junction Temperature: -55°C to +150°C
Always check these ratings before you use the IRF740 in your project. If you stay within these limits, your MOSFET will last longer and work better.
The IRF740 can handle high voltage and current. You can use it in circuits that need strong and fast switching. The wide temperature range means you can use it in many environments.
Electrical Characteristics
You should also look at the electrical characteristics of the IRF740. These numbers show how the MOSFET works in real circuits. They help you pick the right part for your needs.
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On-Resistance (Rds(on)): About 0.54 Ω at Vgs = 10 V
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Gate Threshold Voltage (Vgs(th)): 2.0 V to 4.0 V
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Total Gate Charge (Qg): 67 nC (typical)
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Rise Time: 18 ns (typical)
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Fall Time: 14 ns (typical)
The IRF740 also has important capacitance values. These affect how fast the MOSFET can switch on and off. Here is a table with the typical capacitance values:
| Parameter | Typical Value | Test Conditions | Unit |
|---|---|---|---|
| Input Capacitance (Ciss) | 1400 | VGS = 0 V, VDS = 25 V, f = 1 MHz | pF |
| Output Capacitance (Coss) | 330 | VGS = 0 V, VDS = 25 V, f = 1 MHz | pF |
Note: Lower capacitance means faster switching. The IRF740’s low output capacitance helps you build circuits that react quickly.
You can see that the IRF740 is a strong and fast MOSFET. It works well in high-speed and high-power circuits. Always use these numbers to guide your design choices.
IRF740 Equivalent MOSFETs
Equivalent Parts List
If you need to swap out the IRF740, you have many choices. Engineers look for a part with the same voltage, current, and package. Here is a table with some IRF740 equivalent MOSFETs:
| Equivalent MOSFETs for IRF740 Replacement |
|---|
| BUZ61A |
| IRF740PBF |
| IRF740APBF |
| RFP7N35 |
| STP11NB40 |
| SIHF740-E3 |
| 2SK1400A |
| IRFB13N50A |
| UF450A |
| SSF13N15 |
You can use these parts instead of the IRF740 in most circuits. Always read the datasheet to check if the new part will work.
Comparison Notes
You need to look at the main electrical numbers before picking an IRF740 equivalent. The table below shows how some choices compare:
| MOSFET Model | Drain-Source Voltage (Vdss) | Continuous Drain Current (Id) | On-Resistance (R_DS(on)) |
|---|---|---|---|
| IRF740 | 400 V | 10 A | 0.55 Ω |
| IRFP740 | 400 V | 10 A | 0.55 Ω |
| IRF260 | 200 V | 56 A | 0.04 Ω |
The IRFP740 has the same voltage, current, and resistance as the IRF740. This makes it a good replacement for most uses. The IRF260 has a lower voltage rating, so do not use it for high-voltage circuits.
Tip: When you pick a replacement, check these things:
The voltage rating should be at least 400V for safety.
The gate drive voltage must match your circuit. The IRF740 needs about 10V at the gate.
Look at the on-resistance and thermal ratings to keep things cool.
Make sure the package type fits and the part is easy to buy.
You should also think about how fast it switches, the safe area, and the price. Sometimes, a higher voltage part costs more or has more resistance. Choose the IRF740 equivalent that works best for your project.
IRF740 Circuit Examples
Switch Circuit
You can use the IRF740 as a simple switch in a DC load circuit. When you apply voltage to the gate, the MOSFET turns on and lets current flow from the drain to the source. For example, if you connect +5V to the gate, the IRF740 will start to conduct. However, you should know that 5V at the gate may not fully turn on the MOSFET. This can cause higher power loss because of the on-resistance. If you switch a high voltage, like 300V DC, with a low-resistance load, the MOSFET can get very hot. You may need to add a heat sink or use more than one MOSFET in parallel. If your load is a motor or another coil, you should place a diode across the load. This protects the circuit from voltage spikes when you turn off the switch.
Here is a simple switch circuit diagram:
+VDC ---- Load ---- Drain (IRF740) Source ---- GND
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Gate
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Control Signal (5V-10V)
Motor Driver
You can build a basic motor driver circuit with the IRF740. Connect the motor between the positive supply and the drain. The source goes to ground. Use a microcontroller or a switch to control the gate. When you send a signal to the gate, the MOSFET turns on and the motor runs. For motors, always add a flyback diode across the motor terminals. This protects the MOSFET from voltage spikes when the motor stops. You can use this setup for small DC motors in robots or toys.
Power Supply
The IRF740 works well in power supply circuits. You can use it in the switching stage of a power supply to control the flow of energy. In a typical setup, the MOSFET acts as a fast switch. A controller chip sends signals to the gate. The IRF740 turns on and off quickly, helping to change or regulate voltage. You must keep the MOSFET cool, so attach it to a heat sink. Always check the datasheet to make sure the MOSFET can handle the voltage and current in your power supply circuit.
Tip: Always test your circuit on a breadboard before making a final version. This helps you find problems early and keeps your project safe.
IRF740 Applications
You can use the IRF740 in many strong circuits. This MOSFET works in both factories and home electronics. Here are some common ways people use the IRF740:
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Embedded systems that need to control power
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Motor drivers for machines and home devices
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Battery chargers for big batteries
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Lighting and ballast circuits for houses and businesses
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Uninterruptible Power Supplies (UPS) for backup power
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DC-DC converters to keep voltage steady
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LED dimmers and flashing light circuits
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Audio amplifiers
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Inverter circuits for solar or wind energy
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Motor speed control in electric cars
Power Supplies
The IRF740 is often used in strong power supply circuits. Its 400V rating makes it good for switching and controlling voltage. You can use it in solid-state relays and DC-DC converters. The IRF740 helps make power supplies work well because it switches fast and handles high voltage. It gives steady performance in both home and factory power supplies.
The IRF740 can take the place of other MOSFETs like the IRF840 in many power supply circuits.
Motor Control
Motor control is an important use for the IRF740. You can use this MOSFET in both AC and DC motor drivers for machines and appliances. The IRF740 has many good points for motor control:
| Performance Benefit | Explanation |
|---|---|
| Low Gate Charge | Makes it easy and simple to drive the gate. |
| Fast Switching Speed | Helps motors react quickly in circuits. |
| Low On-Resistance | Cuts down on wasted energy and heat. |
| High Voltage Withstand | Handles the high voltages found in motor circuits. |
| Ruggedness | Works well even in tough places. |
You get strong and efficient motor control with the IRF740.
LED Dimmers
You can use the IRF740 in circuits that dim LEDs. Its low drain-source resistance of 0.55 Ohms means less wasted power and less heat. Fast switching lets you change LED brightness smoothly. The IRF740 can handle up to 10A and 400V, so it works for both home and business lights. You get good and quick LED dimming with this MOSFET.
Battery Chargers
Battery chargers often need to handle high current and voltage. The IRF740 is a good choice for these strong circuits. You need about 10V at the gate to turn it on all the way. If you use a microcontroller, you need a MOSFET driver or a higher voltage for the gate. This helps the MOSFET switch well and keeps your battery charger working right. Always check your gate voltage to avoid trouble.
For best results in battery charger circuits, use a special driver to get the right gate voltage.
IRF740 Datasheet Download
If you want to use the IRF740, you need its datasheet. The datasheet has all the important facts about the part. You can find it on trusted websites. Always pick safe sites so you get the right details.
Start by looking at the maker’s website. Vishay Siliconix makes the IRF740. Their website has the newest datasheet and tech help. You can also check trusted sellers. These sellers have datasheets and help you buy the part. Some sellers also give extra help like checking quality and answering questions.
Here is a table with some good places to get the IRF740 datasheet:
| Source | Role | Key Details |
|---|---|---|
| Vishay Siliconix | Manufacturer | Original source for IRF740 datasheet and technical updates. |
| Ovaga | Trusted Distributor | Offers original IRF740 parts, datasheet links, quality assurance, and customer support. |
| Allelco Limited | Reputable Distributor | Provides downloadable IRF740 datasheets and global procurement services. |
Tip: Compare the datasheet from the maker with the ones from sellers. This helps you see if there are any changes or new info.
You can trust these places to give you safe and correct info. Getting the datasheet from a good site helps you build your circuit the right way. If you need help, these sites have teams to answer your questions.
The irf740 is good for switching big amounts of power. It reacts quickly, so it works well in tough jobs. Its 400V rating lets it handle high voltage. It can also deal with strong currents. This makes it great for things like UPS systems and motor drivers. You should always check the official datasheet before you use it. This helps you make sure it fits your project and keeps things safe. If you need different features, you can look at other MOSFETs that are similar. Learning about datasheets, pinouts, and circuit examples helps you build strong and safe circuits.
FAQ
What is the main use of the IRF740 MOSFET?
You use the IRF740 mainly for switching and controlling high voltage or current in circuits. It works well in power supplies, motor drivers, and battery chargers.
Can you drive the IRF740 directly from a microcontroller?
No, you cannot drive the IRF740 directly from most microcontrollers. You need a gate driver or a higher voltage at the gate, usually around 10V, to turn it on fully.
How do you protect the IRF740 in a circuit?
You should use a heat sink to keep it cool. Add a flyback diode across inductive loads like motors. Always stay within the voltage and current ratings from the datasheet.
What is a good replacement for the IRF740?
You can use the IRFP740 or BUZ61A as replacements. Always check the voltage, current, and package type to make sure the new part matches your needs.
Why does the IRF740 get hot during operation?
The IRF740 gets hot if you exceed its current rating or do not provide enough gate voltage. Poor cooling or high on-resistance can also cause heating. Use a heat sink and check your circuit design.
Written by Jack Elliott from AIChipLink.
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