IRF720 Pinout, Equivalent, Application, Datasheet

The IRF720 is a high-voltage N-Channel MOSFET designed for efficient switching in SMPS, power supplies, high-voltage regulators, and inverter driver stages. With a rugged TO-220 package and dependable high-voltage capability, it is widely used in industrial and consumer power electronics. Before proceeding, here is the essential IRF720 pinout for correct wiring and circuit design.

Introduction to IRF720 N-Channel MOSFET

The IRF720 is a high-voltage enhancement-mode N-Channel MOSFET capable of handling up to 400V, making it suitable for demanding power-switching applications. Its moderate drain current rating, reliable thermal handling, and stable performance allow it to be used in offline SMPS circuits, high-voltage power supplies, and flyback converters. With efficient switching characteristics, it offers reduced losses and enhanced system reliability.

IRF720 N-Channel MOSFET

Pinout of IRF720

Pin Configuration of IRF720 Pinout

The IRF720 uses the standard TO-220 G-D-S pin configuration common in many MOSFETs. The Gate receives the control signal, the Drain connects to the load or high-voltage supply, and the Source acts as the return path. Correct orientation is crucial to prevent reverse conduction and device failure, especially in high-voltage circuits.

Key Features of IRF720 MOSFET

• High-voltage N-Channel MOSFET structure
• Fast switching capability for SMPS
• Rugged construction with high avalanche energy rating
• Low input capacitance for high-frequency applications
• Reliable performance under thermal and electrical stress
• Ideal for high-voltage converters and power supplies
• TO-220 package for easy installation and heat dissipation

Datasheet and Specifications of IRF720 MOSFET

• Drain–Source Voltage (VDS): 400V
• Gate–Source Voltage (VGS): ±20V
• Continuous Drain Current (ID): 3.3A
• Pulsed Drain Current (IDM): 13A
• Power Dissipation (Ptot): 50W
• On-Resistance (RDS(on)): 1.8Ω
• Storage Temperature (Tstg): –55°C to +150°C
• Junction Temperature (TJ): 150°C
• Package: TO-220
• Pin Configuration: Gate–Drain–Source (G-D-S)

Working Principle of IRF720 MOSFET

The IRF720 operates as a voltage-driven electronic switch. When a positive voltage is applied at the gate relative to the source, a conductive channel forms, allowing current to flow from drain to source. Its high breakdown voltage makes it suitable for circuits directly connected to mains rectified DC or high-voltage transformer secondaries. Due to its fast switching speed, the IRF720 minimizes switching losses and improves overall power conversion efficiency.

More Circuit Layouts

Applications of IRF720 MOSFET

• High-voltage SMPS circuits
• Flyback and forward converters
• LED drivers and high-voltage regulators
• Inverter driver stages
• Power-factor correction circuits
• High-voltage DC switching
• Industrial control equipment
• Consumer power supplies

Equivalent and Alternative MOSFETs

Possible replacements or equivalents include:

Direct or close equivalents:

• IRF740
• IRF730
• IRF620 (lower voltage)

Alternative substitutes (verify ratings):

• 2SK1118
• MTP2N50
• BUZ90A
• STF7N60 (higher voltage MOSFET)

Always compare voltage, current, and RDS(on) before substituting.

Frequently Asked Questions (FAQ)

Q1: Can IRF720 be used in SMPS circuits?
Yes, it is commonly used in flyback and forward SMPS designs due to its high-voltage capability.

Q2: Do I need a heatsink?
Yes, especially when operating above moderate current levels or in continuous switching applications.

Q3: Can IRF720 replace IRF740?
Only if your voltage and current requirements are within IRF720’s limits, since IRF740 supports higher voltage.

Q4: Is the IRF720 suitable for high-frequency switching?
Yes, its low input capacitance allows efficient use in medium to high-frequency circuits.

Conclusion

The IRF720 N-Channel MOSFET is a strong performer in high-voltage switching environments, offering a balance of power handling, efficiency, and durability. Its fast switching response and stable performance make it ideal for SMPS, LED drivers, inverters, and industrial controls. For designers working with high-voltage DC circuits, the IRF720 remains a reliable and cost-effective choice.

Datasheet & Pinout of IRF720 N-Channel MOSFET

Click the following Button to download the datasheet of IRF720 MOSFET :

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