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

Vishay Siliconix IRFI740GLC

Name: IRFI740GLC
Brand: Vishay Siliconix
SKU: IRFI740GLC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFI740GLC

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

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

Datasheet:: IRFI740GLC.pdf

Description:: MOSFET N-CH 400V 5.7A TO220-3

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Product details

Overview

IRFI740GLC from Vishay Siliconix is a 400 V, 5.7 A N-channel power MOSFET in TO-220 FULLPAK package, featuring 0.55 Ω R_DS(on) at V_GS = 10 V, 39 nC total gate charge, and 2.5 kV_RMS isolation for high-voltage switching applications such as AC-DC power supplies and motor controls.

For engineers reviewing the IRFI740GLC datasheet, IRFI740GLC pinout, IRFI740GLC application, or IRFI740GLC equivalent, this device offers verified repetitive avalanche rating (5.7 A), enhanced ±30 V gate drive tolerance, isolated tab construction, and low thermal resistance (3.1 °C/W junction-to-case) - critical for reliable high-voltage hard-switching designs.

Technical Context

The IRFI740GLC employs planar VDMOS technology optimized for high-voltage, medium-current switching with ultra-low gate charge (39 nC) and fast switching times (td(on) = 11 ns, tr = 31 ns). Its isolated TO-220 FULLPAK package integrates a high-voltage insulating molding compound enabling direct heatsink mounting without additional insulation hardware.

It supports unclamped inductive switching with 310 mJ single-pulse avalanche energy and 4.0 mJ repetitive avalanche energy, while its body diode exhibits 380–570 ns reverse recovery time and 2.8–4.2 μC Q_rr, making it suitable for freewheeling and snubberless topologies where diode recovery behavior impacts EMI and loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - Withstands DC bus voltages up to 320 V in 400 V-rated SMPS designs with margin.
R_DS(on)	0.55 Ω @ V_GS = 10 V - Enables <1.9 W conduction loss at 5.7 A continuous drain current.
Q_g	39 nC - Reduces gate driver power requirement and enables efficient operation with standard 10 V logic-level drivers.
I_D (T_C = 100 °C)	3.6 A - Specifies usable continuous current under real-world heatsink-limited thermal conditions.
R_thJC	3.1 °C/W - Allows precise junction temperature estimation when mounted on heatsink with known thermal interface resistance.
E_AS	310 mJ - Supports robust operation during transient overloads or inductive turn-off without failure.
V_GS rating	±30 V - Permits use of higher gate drive voltage for faster turn-on and improved noise immunity.

Pinout & Package

IRFI740GLC uses the TO-220 FULLPAK package: insulated plastic housing with electrically isolated metal tab (drain-connected), 3-pin through-hole configuration, 15.87 mm length, 10.10 mm width, and 4.70 mm height. The tab provides low thermal resistance (3.1 °C/W) and 2.5 kV_RMS isolation for safe high-voltage mounting.

Pin/Terminal	Circuit Role	Design Meaning
Lead 1 (left)	Source (S)	Main current return path; connected to PCB ground plane or source node; low-inductance layout critical for switching stability.
Lead 2 (center)	Gate (G)	Control input; requires low-impedance gate driver path to minimize ringing and ensure full enhancement at 10 V.
Lead 3 (right)	Drain (D)	High-side switch node; internally bonded to isolated metal tab - must be thermally coupled to heatsink but electrically isolated from chassis.

Key Features

Feature	Design Value
Ultra-low gate charge (39 nC)	Reduces gate driver power dissipation and enables higher-frequency operation without excessive driver heating.
Isolated TO-220 FULLPAK package	Eliminates need for insulating washers or pads - simplifies mechanical assembly and improves thermal reliability in high-voltage systems.
Repetitive avalanche rated (I_AR = 5.7 A)	Ensures ruggedness against inductive kickback in relay drivers, solenoid controls, and flyback snubberless designs.
Enhanced ±30 V V_GS rating	Supports robust gate drive design with margin against transients and allows overdrive for faster switching.
Sink-to-lead creepage = 4.8 mm	Meets reinforced insulation requirements for 400 V AC mains-connected equipment per IEC 60950/62368.

Applications

AC-DC Power Supply	Motor Drive Stage
Use Scenario: Primary-side switching transistor in 100–300 W offline flyback or forward converters operating from 85–265 V_AC input. IC Role / Device Role / Timing Role: High-voltage power switch controlling energy transfer via transformer primary winding; operates at 65–130 kHz with hard switching. Use Value: 400 V V_DS rating and 310 mJ E_AS provide margin against reflected output voltage spikes and line surges.	Use Scenario: Low-side switch in 24–48 V brushed DC motor H-bridge or half-bridge driver for industrial actuators. IC Role / Device Role / Timing Role: Current-sinking power stage handling bidirectional load current; commutated at ≤20 kHz with body diode freewheeling. Use Value: 5.7 A continuous current and 380–570 ns t_rr enable low-loss PWM control with minimal diode recovery loss and EMI.
Inductive Load Driver	High-Voltage Relay Replacement
Use Scenario: Solid-state replacement for electromechanical relays driving solenoids, valves, or contactors in HVAC and building automation. IC Role / Device Role / Timing Role: Unclamped inductive switch absorbing stored energy via avalanche breakdown during turn-off. Use Value: Repetitive avalanche rating (I_AR = 5.7 A, E_AR = 4.0 mJ) ensures long-term reliability without external snubbers.	Use Scenario: Isolated high-voltage switch in programmable logic controller (PLC) output modules switching 240 V_AC loads. IC Role / Device Role / Timing Role: Electrically isolated power switch with reinforced creepage (4.8 mm) and 2.5 kV_RMS isolation for functional safety compliance. Use Value: TO-220 FULLPAK's integrated isolation eliminates external insulation hardware and reduces BOM cost and assembly steps.

AC-DC Power Supply

Motor Drive Stage

Use Scenario: Primary-side switching transistor in 100–300 W offline flyback or forward converters operating from 85–265 V_AC input.

IC Role / Device Role / Timing Role: High-voltage power switch controlling energy transfer via transformer primary winding; operates at 65–130 kHz with hard switching.

Use Value: 400 V V_DS rating and 310 mJ E_AS provide margin against reflected output voltage spikes and line surges.

Use Scenario: Low-side switch in 24–48 V brushed DC motor H-bridge or half-bridge driver for industrial actuators.

IC Role / Device Role / Timing Role: Current-sinking power stage handling bidirectional load current; commutated at ≤20 kHz with body diode freewheeling.

Use Value: 5.7 A continuous current and 380–570 ns t_rr enable low-loss PWM control with minimal diode recovery loss and EMI.

Inductive Load Driver

High-Voltage Relay Replacement

Use Scenario: Solid-state replacement for electromechanical relays driving solenoids, valves, or contactors in HVAC and building automation.

IC Role / Device Role / Timing Role: Unclamped inductive switch absorbing stored energy via avalanche breakdown during turn-off.

Use Value: Repetitive avalanche rating (I_AR = 5.7 A, E_AR = 4.0 mJ) ensures long-term reliability without external snubbers.

Use Scenario: Isolated high-voltage switch in programmable logic controller (PLC) output modules switching 240 V_AC loads.

IC Role / Device Role / Timing Role: Electrically isolated power switch with reinforced creepage (4.8 mm) and 2.5 kV_RMS isolation for functional safety compliance.

Use Value: TO-220 FULLPAK's integrated isolation eliminates external insulation hardware and reduces BOM cost and assembly steps.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP4NK40ZFP	400 V, 4.0 A, R_DS(on) = 1.4 Ω, Q_g = 18 nC, TO-220FP (fully insulated)	Lower current rating and higher R_DS(on); better suited for lower-power, space-constrained designs	Choose STP4NK40ZFP when gate drive is limited to 5 V and thermal budget permits higher conduction loss.
IXTP4N40P	400 V, 4.0 A, R_DS(on) = 1.2 Ω, Q_g = 22 nC, TO-220 (non-isolated)	No built-in isolation; requires external insulator; lower gate charge than IRFI740GLC but higher on-resistance	Select IXTP4N40P only if mechanical isolation is implemented separately and board layout accommodates non-isolated tab mounting.

Compared with STP4NK40ZFP and IXTP4N40P, the IRFI740GLC delivers higher continuous current (5.7 A vs. 4.0 A), lower R_DS(on) (0.55 Ω vs. ≥1.2 Ω), and integrated 2.5 kV_RMS isolation - making it preferable for thermally demanding, safety-critical 400 V switching where gate drive headroom and avalanche ruggedness are essential.

Availability

IRFI740GLC is available at Aetrix Electronics and suitable for AC-DC power supplies, motor drive stages, and inductive load drivers requiring stable component supply and long-term industrial lifecycle support.

Supply support for IRFI740GLC 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 power MOSFETs, diodes, and optoelectronics with emphasis on ruggedness, reliability, and high-voltage performance.

The IRFI740GLC belongs to Vishay's high-voltage isolated power MOSFET product line, engineered for industrial and commercial switching applications where electrical isolation, avalanche capability, and thermal efficiency are critical system requirements.

FAQ

What is the maximum continuous drain current for IRFI740GLC at 100 °C case temperature?

The IRFI740GLC has a maximum continuous drain current of 3.6 A at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This value reflects derating due to thermal limitations and must be used with appropriate heatsinking to maintain junction temperature below 150 °C. The IRFI740GLC datasheet confirms this rating applies under steady-state conduction with proper thermal management.

Does IRFI740GLC have an electrically isolated tab, and what is its isolation rating?

Yes, the IRFI740GLC features an electrically isolated metal tab rated for 2.5 kV_RMS (60 s, 60 Hz), as confirmed in the Features section and Absolute Maximum Ratings. This isolation is achieved via the TO-220 FULLPAK package's high-dielectric-strength molding compound, eliminating the need for external insulators when mounting to grounded heatsinks. The IRFI740GLC's creepage distance from sink to lead is 4.8 mm.

What is the total gate charge (Qg) specification for IRFI740GLC, and how does it impact gate driver selection?

The IRFI740GLC has a maximum total gate charge of 39 nC at V_GS = 10 V, measured under ID = 10 A and V_DS = 320 V conditions. This value directly determines required gate driver peak current: for 50 ns rise time, ~780 mA is needed. The IRFI740GLC's low Q_g enables use of compact, low-power gate drivers without sacrificing switching speed or efficiency.

Is IRFI740GLC rated for repetitive avalanche operation, and what are the limits?

Yes, the IRFI740GLC is explicitly rated for repetitive avalanche operation with I_AR = 5.7 A and E_AR = 4.0 mJ, as stated in the Absolute Maximum Ratings. These values assume pulse width and duty cycle limitations defined by junction temperature constraints (see Figure 11). The IRFI740GLC's avalanche ruggedness is validated per JEDEC standards and supports reliable operation in unclamped inductive switching circuits.

What is the body diode reverse recovery time (t_rr) of IRFI740GLC, and under what test conditions is it specified?

The IRFI740GLC body diode reverse recovery time is specified as 380–570 ns at T_J = 25 °C, I_F = 10 A, and dI/dt = 100 A/μs, per the Diode Characteristics table. This parameter affects switching loss and EMI in freewheeling configurations. The IRFI740GLC's t_rr is consistent with its 2.8–4.2 μC Q_rr, confirming suitability for moderate-frequency hard-switched topologies.

IRFI740GLC 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:: 5.7A (Tc)

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

Rds On (Max) @ Id, Vgs:: 550mOhm @ 3.4A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 39 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1100 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 40W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

IRFI740GLC FAQ

1.How can I place an order for IRFI740GLC through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFI740GLC 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 IRFI740GLC reliable?

The price and inventory of IRFI740GLC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFI740GLC is usually 5 days.

3.What payment methods are accepted for IRFI740GLC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFI740GLC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFI740GLC?

IRFI740GLC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFI740GLC 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 IRFI740GLC?

For technical support, including IRFI740GLC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFI740GLC requirements.

6.How does Aetrix verify that IRFI740GLC is sourced from the original manufacturer or authorized distributors?

All IRFI740GLC 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 IRFI740GLC meets industry standards.

7.What is the process for return or replacement of IRFI740GLC?

All IRFI740GLC units undergo pre-shipment inspection (PSI). If there is an issue with IRFI740GLC, 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 IRFI740GLC part is unused and in its original packaging.

Return procedure for IRFI740GLC:

1.Submit a request within 90 days.

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

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