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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Vishay Siliconix IRFI720G

Name: IRFI720G
Brand: Vishay Siliconix
SKU: IRFI720G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFI720G

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack, Isolated Tab

Datasheet:: IRFI720G.pdf

Description:: MOSFET N-CH 400V 2.6A TO220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFI720G from Vishay Siliconix is a 400 V, 2.6 A N-channel power MOSFET in TO-220 FULLPAK package with isolated tab, 1.8 Ω R_DS(on) at V_GS = 10 V, 20 nC total gate charge, and 2.5 kV_RMS isolation rating-designed for high-voltage AC/DC power supplies, motor control snubbers, and industrial relay replacement circuits.

For engineers reviewing the IRFI720G datasheet, IRFI720G pinout, IRFI720G application, or IRFI720G equivalent, this page delivers verified electrical parameters, thermal performance data, isolation-critical mounting guidance, and real-world switching behavior under unclamped inductive load conditions.

Technical Context

The IRFI720G employs a third-generation silicon process optimized for ruggedized avalanche operation and fast dynamic dV/dt immunity (4.0 V/ns). Its TO-220 FULLPAK construction integrates a molded isolating barrier equivalent to a 100 µm mica sheet, enabling direct heatsink mounting without insulating hardware.

It features low thermal resistance (R_thJC = 4.1 °C/W), supports repetitive avalanche energy up to 3.0 mJ, and exhibits body diode reverse recovery time of 300–600 ns with Q_rr = 1.5–3.0 µC-critical for hard-switched flyback and forward converter topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - Withstands full mains rectified voltage in 230 VAC systems with margin.
R_DS(on)	1.8 Ω @ V_GS = 10 V - Enables low conduction loss in <3 A continuous current stages.
Q_g	20 nC - Determines gate drive power requirement and switching speed in hard-switched SMPS.
E_AS	150 mJ - Supports single-pulse unclamped inductive switching without failure.
dV/dt Rating	4.0 V/ns - Resists false turn-on during high-slew-rate transients in noisy industrial environments.
R_thJC	4.1 °C/W - Allows 30 W dissipation at T_C = 25 °C; critical for heatsink sizing in enclosed enclosures.
I_D (T_C = 100 °C)	1.7 A - Defines usable current derating in thermally constrained PCB layouts.

Pinout & Package

IRFI720G uses the TO-220 FULLPAK package: isolated metal tab (drain-connected), 3-pin through-hole outline with 2.54 mm lead pitch, 15.87 mm length, and 10.1 mm width. The molded compound provides 4.8 mm creepage between sink and leads.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current path output / heatsink interface	Electrically isolated but thermally coupled; requires no insulator when mounted to heatsink.
Source	Reference node for gate drive and current sensing	Low-inductance source connection essential for stable switching and accurate IS monitoring.
Gate	Control input for channel conduction	Requires ≤±20 V drive; 3.3 nC Q_gs enables fast turn-on with moderate gate resistor values.

Key Features

Feature	Design Value
High-voltage isolation	2.5 kV_RMS (60 s, 60 Hz) eliminates need for mica washers or silicone pads in commercial-industrial mounting.
Repetitive avalanche capability	Rated for I_AR = 2.6 A and E_AR = 3.0 mJ-enables robust operation in inductive load switching without external clamping.
Body diode performance	V_SD = 1.6 V @ 2.6 A and t_rr = 300–600 ns-supports synchronous rectification in low-frequency flyback designs.
Thermal efficiency	R_thJC = 4.1 °C/W enables compact heatsink use in space-constrained 24–48 V industrial controls.
Dynamic dV/dt immunity	4.0 V/ns rating prevents spurious turn-on in high-noise motor drive gate loops.

Applications

Industrial Relay Replacement	AC/DC Power Supply Snubber
Use Scenario: Replacing electromechanical relays in programmable logic controllers (PLCs) handling 240 VAC loads up to 2 A. IC Role / Device Role / Timing Role: High-side switch controlling resistive/inductive loads with zero-crossing immunity and surge tolerance. Use Value: Eliminates contact wear, bounce, and EMI from arcing-extends system lifetime and reduces maintenance in factory automation.	Use Scenario: Clamping voltage spikes across transformer primary windings in offline flyback converters operating at 50–100 kHz. IC Role / Device Role / Timing Role: Passive snubber switch absorbing leakage inductance energy during MOSFET turn-off. Use Value: Reduces stress on main power switch and EMI filter components by limiting V_DS overshoot to <450 V.
Motor Control Brake Circuit	High-Voltage DC Link Protection
Use Scenario: Dynamic braking in 24–48 V brushed DC motor drives where back-EMF must be dissipated as heat during rapid deceleration. IC Role / Device Role / Timing Role: Low-duty-cycle power switch sinking regenerated current into a braking resistor. Use Value: Handles 10 A pulsed current (I_DM) and 150 mJ single-pulse avalanche energy without failure during emergency stops.	Use Scenario: Overvoltage crowbar protection in 300–400 V DC link rails for inverters and UPS systems. IC Role / Device Role / Timing Role: Fast-acting shunt device triggered by voltage monitor IC to short rail to ground during fault events. Use Value: Withstands 400 V blocking and triggers reliably within nanoseconds due to low gate threshold (2.0–4.0 V) and minimal Q_g.

Industrial Relay Replacement

AC/DC Power Supply Snubber

Use Scenario: Replacing electromechanical relays in programmable logic controllers (PLCs) handling 240 VAC loads up to 2 A.

IC Role / Device Role / Timing Role: High-side switch controlling resistive/inductive loads with zero-crossing immunity and surge tolerance.

Use Value: Eliminates contact wear, bounce, and EMI from arcing-extends system lifetime and reduces maintenance in factory automation.

Use Scenario: Clamping voltage spikes across transformer primary windings in offline flyback converters operating at 50–100 kHz.

IC Role / Device Role / Timing Role: Passive snubber switch absorbing leakage inductance energy during MOSFET turn-off.

Use Value: Reduces stress on main power switch and EMI filter components by limiting V_DS overshoot to <450 V.

Motor Control Brake Circuit

High-Voltage DC Link Protection

Use Scenario: Dynamic braking in 24–48 V brushed DC motor drives where back-EMF must be dissipated as heat during rapid deceleration.

IC Role / Device Role / Timing Role: Low-duty-cycle power switch sinking regenerated current into a braking resistor.

Use Value: Handles 10 A pulsed current (I_DM) and 150 mJ single-pulse avalanche energy without failure during emergency stops.

Use Scenario: Overvoltage crowbar protection in 300–400 V DC link rails for inverters and UPS systems.

IC Role / Device Role / Timing Role: Fast-acting shunt device triggered by voltage monitor IC to short rail to ground during fault events.

Use Value: Withstands 400 V blocking and triggers reliably within nanoseconds due to low gate threshold (2.0–4.0 V) and minimal Q_g.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage N-channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP4NK60ZFP	600 V V_DS, 3.5 Ω R_DS(on), TO-220FP (non-isolated), lower Q_g (12 nC)	Lacks 2.5 kV isolation; requires insulating hardware for heatsink mounting.	Prefer when higher voltage margin is needed and isolation can be added externally.
FQP4N40	400 V V_DS, 3.0 Ω R_DS(on), standard TO-220 (non-isolated), higher R_thJC (5.0 °C/W)	No isolation rating; lower avalanche energy (E_AS = 95 mJ); less rugged dV/dt immunity.	Select only for cost-sensitive non-isolated designs with conservative thermal margins.

Compared with STP4NK60ZFP and FQP4N40, the IRFI720G uniquely combines certified 2.5 kV_RMS isolation, 4.1 °C/W thermal resistance, and 150 mJ single-pulse avalanche energy-making it the only choice for space-constrained, isolated, high-reliability industrial switching where heatsink integration and transient robustness are mandatory.

Availability

IRFI720G is available at Aetrix Electronics and suitable for industrial relay replacement, AC/DC snubber circuits, and motor brake applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IRFI720G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global leader in discrete semiconductors, specializing in high-reliability MOSFETs, diodes, and optoelectronics for industrial, automotive, and computing markets.

The IRFI720G belongs to Vishay's third-generation high-voltage power MOSFET family, engineered for ruggedized switching in harsh environments where isolation, avalanche endurance, and thermal efficiency are non-negotiable.

FAQ

What is the maximum continuous drain current for the IRFI720G at 100 °C case temperature?

The IRFI720G supports 1.7 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limits of the TO-220 FULLPAK package and ensures safe operation without exceeding 150 °C junction temperature. Designers must verify heatsink performance to maintain T_C ≤ 100 °C under full load when using IRFI720G in sustained conduction modes.

Does the IRFI720G require an insulating pad when mounted to a heatsink?

No-the IRFI720G does not require an insulating pad because its TO-220 FULLPAK package incorporates a molded isolation barrier rated at 2.5 kV_RMS. The metal tab is electrically isolated from the leads while maintaining low thermal resistance (R_thJC = 4.1 °C/W). This allows direct screw or clip mounting to grounded heatsinks in industrial equipment without additional insulation hardware-reducing assembly cost and thermal interface resistance.

What is the gate-source threshold voltage range for the IRFI720G?

The IRFI720G has a gate-source threshold voltage (V_GS(th)) range of 2.0 V to 4.0 V at T_J = 25 °C and I_D = 250 µA. This ensures reliable turn-on with standard 5 V or 10 V logic-level gate drivers while providing noise margin against false triggering. The specification is confirmed in the Static Characteristics section of the Vishay datasheet S21-0974-Rev. D, and applies directly to the IRFI720G part number.

Can the IRFI720G be used in avalanche mode repeatedly?

Yes-the IRFI720G is rated for repetitive avalanche operation with I_AR = 2.6 A and E_AR = 3.0 mJ, provided pulse width and duty cycle remain within limits defined by junction temperature rise. This capability is validated per test condition b in the datasheet and makes IRFI720G suitable for inductive load switching in motor controls and solenoid drivers where external clamping is impractical.

What is the typical body diode reverse recovery time for the IRFI720G?

The IRFI720G exhibits a typical body diode reverse recovery time (t_rr) of 300 ns, with a maximum of 600 ns at T_J = 25 °C, I_F = 3.3 A, and dI/dt = 100 A/µs. This value is measured per the test circuit in Figure 12b and is critical for estimating commutation losses in freewheeling paths. Designers should account for t_rr and Q_rr = 1.5–3.0 µC when selecting gate resistors and snubbers for IRFI720G-based topologies.

IRFI720G Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-220-3 Full Pack, Isolated Tab

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 2.6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.8Ohm @ 1.6A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 20 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 410 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 30W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

IRFI720G FAQ

1.How can I place an order for IRFI720G through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFI720G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for IRFI720G reliable?

The price and inventory of IRFI720G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFI720G is usually 5 days.

3.What payment methods are accepted for IRFI720G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFI720G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFI720G?

IRFI720G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFI720G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for IRFI720G?

For technical support, including IRFI720G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFI720G requirements.

6.How does Aetrix verify that IRFI720G is sourced from the original manufacturer or authorized distributors?

All IRFI720G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IRFI720G meets industry standards.

7.What is the process for return or replacement of IRFI720G?

All IRFI720G units undergo pre-shipment inspection (PSI). If there is an issue with IRFI720G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The IRFI720G part is unused and in its original packaging.

Return procedure for IRFI720G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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