IRF640 Pinout, Equivalent, Application, Datasheet

The IRF640 is a high-voltage, high-current N-Channel power MOSFET widely used in SMPS, inverter circuits, audio amplifiers, motor controllers, and high-efficiency switching stages. With a rugged TO-220 package and excellent switching capability, it is preferred for medium to high-power applications. The IRF640 pinout helps engineers properly connect the Gate, Drain, and Source terminals to achieve optimal switching performance and safe operation.

Introduction to IRF640 N-Channel MOSFET

The IRF640 is an enhancement-mode N-Channel MOSFET designed for high-voltage applications requiring fast switching and efficient power handling. Its ability to operate with up to 200V drain-source voltage and 18A continuous drain current makes it suitable for switching power supplies, DC-to-DC converters, induction heating drivers, and high-frequency power circuits. The device’s low RDS(on) value aids in reduced heat loss, making it a reliable transistor for demanding power electronics projects.

IRF640 N-Channel MOSFET

Pinout of IRF640

Pin Configuration of IRF640 Pinout

The IRF640 uses the TO-220 package with the following pin configuration (front view, pins downward):

This G-D-S arrangement allows easy integration into power supplies, drivers, and inverter circuits.

Key Features of IRF640 MOSFET

• High-voltage switching capability
• Low RDS(on) for improved efficiency
• Fast switching speed
• Rugged and thermally stable TO-220 package
• Suitable for high-frequency switching circuits
• High current-carrying capability
• Reliable operation in demanding power electronics

IRF640 MOSFET Datasheet and Specifications

• Drain-Source Voltage (VDS): 200V
• Gate-Source Voltage (VGS): 20V
• Continuous Drain Current (ID): 18A
• Pulsed Drain Current (IDM): 72A
• Total Power Dissipation (Ptot): 125W
• On-Resistance (RDS(on)): 0.18Ω
• Junction Temperature (TJ): -55°C to +150°C
• Package Type: TO-220
• Pin Configuration: G-D-S

Working Principle of IRF640 MOSFET

The IRF640 operates as an enhancement-mode MOSFET, remaining OFF when the gate voltage is zero. Applying sufficient positive voltage to the gate creates a conductive channel between drain and source. Thanks to its low on-resistance and high voltage rating, this MOSFET efficiently handles inductive loads and fast PWM switching. Its high breakdown voltage allows it to perform reliably in high-voltage converter circuits and inverter topologies.

More Circuit Layouts

Applications of IRF640 MOSFET

• Switch-mode power supplies (SMPS)
• DC motor speed controllers
• High-voltage DC-DC converters
• Audio amplifier power stages
• Solar inverters and UPS circuits
• High-frequency switching circuits
• Inductive load drivers

Equivalent and Alternative MOSFETs

Possible equivalents or replacements include:

• IRF740 (higher voltage)
• IRF630 (lower current)
• IRF540 (lower voltage, higher current)
• STP9NK50Z
• FQP9N50C
• IRFP460 (higher power alternative)

Always verify voltage and current requirements before substitution.

Frequently Asked Questions (FAQ)

Q1: Is IRF640 a logic-level MOSFET?
No. It requires around 10V gate drive for proper switching.

Q2: Can IRF640 be driven directly by Arduino?
Not effectively. A MOSFET driver or BJT driver stage is recommended.

Q3: Is IRF640 suitable for high-frequency switching?
Yes, it performs well in medium to high-frequency SMPS and inverter circuits.

Q4: Does IRF640 need a heatsink?
Yes. For loads above 2–3A, a heatsink is essential for safe operation.

Conclusion

The IRF640 N-Channel MOSFET is a powerful, efficient, and durable semiconductor device suitable for a wide range of medium and high-voltage applications. Its high drain-source voltage capability, fast switching, and reliable thermal performance make it ideal for power electronics such as SMPS, inverters, motor drivers, and DC-DC converters. With its straightforward pinout and robust design, the IRF640 continues to be a dependable choice for engineers and hobbyists alike.

Datasheet & Pinout of IRF640 N-Channel MOSFET

Click the following Button to download the datasheet of IRF640 MOSFET :

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