What Is IRF740 N-channel MOSFET?

Sep 25 2024 2024-09 Semiconductors STMicroelectronics

What Is IRF740?

The IRF740 is an N-channel power MOSFET that incorporates PowerMESH™II technology.
It features a drain-to-source voltage (Vds) rating of 400V and can handle a continuous current of 10A.
It is suitable for medium to high-power applications.
The IRF740 can handle high power densities and achieve high energy efficiency.
The IRF740 has low on-resistance and fast switching characteristics.

Pinout of IRF740

Gate (G): This is the control pin that turns the MOSFET on or off by applying a voltage. It controls the current flow between the drain and source.

Drain (D): The drain is the terminal where the main current flows out of the MOSFET when it is turned on. It's connected to the load in a typical circuit.

Source (S): The source is the terminal where the current flows into the MOSFET from the circuit's ground or negative terminal.

Test Circuits of IRF740

In the basic switch test circuit, the IRF740 is used as a switching element, regulating the load's switching state by controlling its gate voltage. The circuit typically consists of a DC power supply, a load resistor, and a gate drive circuit. The core of the circuit is the IRF740, which operates as an N-channel MOSFET, directly influencing the flow of load current.

Regarding the circuit components, the DC power supply VDD is generally selected to be 24V or higher. The value of the load resistor Rload can be chosen based on the testing requirements, typically ranging from 10Ω to 100Ω. Additionally, the gate resistor Rg is usually set to 10kΩ to limit the gate current and protect the MOSFET. A pull-down resistor Rd, also 10kΩ, is connected between the gate and ground to ensure that the IRF740 remains off when there is no input signal.

In the circuit design, VDD is connected to the Drain pin of the IRF740, while one end of the load resistor Rload is connected to the Source pin of the IRF740, and the other end is grounded. One end of the gate resistor Rg is connected to the Gate pin of the IRF740, and the other end is connected to the control signal source. This configuration allows for effective management of the load's on/off state through the control signal, enabling the MOSFET to be turned on or off as required.

Specification of IRF740

Drain-Source Voltage (Vds): 400 V

Gate-Source Voltage (Vgs): ±20 V

Drive Voltage (Max Rds On, Min Rds On): 10V

Rds On (Max) @ Id, Vgs: 550mOhm @ 6A, 10V

Vgs(th) (Max) @ Id: 4V @ 250µA

Input Capacitance (Ciss) (Max) @ Vds: 1400 pF @ 25 V

Continuous Drain Current (Id): 9 A

Pulsed Drain Current (Idm): 30 A

Power Dissipation (Pd): 94 W

Gate Charge (Qg): 50 nC

Input Capacitance (Ciss): 1350 pF (at V_DS = 25V)

Output Capacitance (Coss): 320 pF

Reverse Recovery Time (trr): 100 ns

Self-Resonant Frequency: 300 MHz

Operating Temperature Range: -55°C ~ 150°C

Features of IRF740

100% avalanche tested

Low gate charge

Very low intrinsic capacitances

Dynamic dV/dt rating

Fast switching

Ease of paralleling

Simple driving requirements

Package of IRF740

The TO-220-3 package of the IRF740 MOSFET is a common semiconductor packaging form widely used in applications such as switch-mode power supplies, motor drives, audio amplifiers, and other circuits requiring high current and high voltage. This packaging typically consists of a metal base and a plastic casing. The metal base provides excellent heat dissipation and can be connected to solder points on the circuit board. Additionally, the moderate size of the TO-220-3 package facilitates easy layout and installation on circuit boards.

Where to Use IRF740?

The IRF740 is used for various fields. Firstly, it is commonly used in power converters to achieve efficient energy management and conversion. Whether for DC-to-DC conversion or AC-to-DC conversion, the IRF740 meets the demands of power design. Additionally, in motor control circuits, the IRF740 can switch rapidly to control the starting, stopping, and speed regulation of motors, enhancing the overall efficiency of the system. In audio amplifiers, the IRF740 is used in the output stage to provide high-power amplification of audio signals.

How to Test IRF740?

When testing the IRF740, you can evaluated its performance in a few key steps. First, after connecting the circuit of IRF740, start the power supply. By applying a high level to the gate via the control signal, the IRF740 will conduct and current will begin to flow on the load resistor. Then apply a low level to the gate, the IRF740 will turn off and the load current will stop. Finally, you can use a multimeter to measure the voltage across the load resistor to verify the operation of this MOSFET.

FAQs

Where is the IRF740 used?

The IRF740 is commonly used in power supplies, motor drivers, DC-DC converters, and audio amplifiers. It’s particularly effective in circuits that require high-speed switching and high power handling.

How do I choose the IRF740 for my application?

You should consider the voltage and current ratings of the IRF740, ensuring they match the requirements of your circuit. The IRF740 supports up to 400V and 10A, so it’s important to verify that these values align with your application's needs. Additionally, its switching speed and thermal performance should be evaluated.

What is the package type of the IRF740?

The IRF740 comes in a TO-220-3 package, which provides good thermal dissipation and is easy to mount on a heatsink. This package is widely used in power circuits due to its balance of size and heat management.

The Products You May Be Interested In

CP2725AC54TEP	AC/DC CONVERTER 54V 5V 2725W	259 More on Order
AXH010A0F-SR	DC DC CONVERTER 3.3V 33W	408 More on Order
AXA010A0Y93-SRZ	DC DC CONVERTER 1.8V 18W	393 More on Order
JRCW016A0R64-18Z	DC DC CONVERTER 28V 448W	149 More on Order
HW004A0A61	DC DC CONVERTER 5V 20W	200 More on Order
KNW013A0A4-88SRZ	DC DC CONVERTER 5V 65W	466 More on Order
SC003A0A91-SRZ	DC DC CONVERTER 5V 15W	136 More on Order
QRW025A0A71-H	DC DC CONVERTER 5V 125W	133 More on Order
EVW020A0A41Z	DC DC CONVERTER 5V 100W	320 More on Order
EHW015A0A41-HZ	DC DC CONVERTER 5V 75W	423 More on Order
AXB070X43Z	DC DC CONVERTER 5-15V 70W	391 More on Order
EQW020A0F1-SZ	DC DC CONVERTER 3.3V 66W	496 More on Order
LW015F94	DC DC CONVERTER 3.3V 15W	499 More on Order
LW015B	DC DC CONVERTER 12V 15W	443 More on Order
JHW050AF-S	DC DC CONVERTER 5V 3.3V 50W	270 More on Order
HW012A0M1-S	DC DC CONVERTER 1.5V 18W	480 More on Order
ATA010A0X3-SR	DC DC CONVERTER 0.8-5.5V 55W	374 More on Order
QBVW033A0B541-PZ	DC DC CONVERTER 12V 400W	165 More on Order
EHHD010A0B641-HZ	DC DC CONVERTER 12V	351 More on Order
KSTW006A0A41-SRZ	DC DC CONVERTER 5V 30W	497 More on Order
APTH012A0X3-SRZ	DC DC CONVERTER 0.6-3.6V 44W	425 More on Order
PVX012A0X43-SRZ	DC DC CONVERTER 0.6-5.5V 66W	300 More on Order
APTS030A0X3-SRPHZ	DC DC CONVERTER 0.8-2.75V 82W	457 More on Order
QHHD019A0B41-HZ	DC DC CONVERTER 12V 225W	1367 More on Order