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

Vishay Siliconix IRFI840GLC

Name: IRFI840GLC
Brand: Vishay Siliconix
SKU: IRFI840GLC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFI840GLC

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

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

Datasheet:: IRFI840GLC.pdf

Description:: MOSFET N-CH 500V 4.5A TO220-3

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Product details

Overview

IRFI840GLC from Vishay Siliconix is a 500 V, 4.5 A N-channel power MOSFET in TO-220 FULLPAK package, featuring 0.85 Ω R_DS(on) at V_GS = 10 V, 39 nC total gate charge, and 2.5 kV_RMS isolation rating. It delivers robust avalanche capability (300 mJ single-pulse), enhanced ±30 V gate rating, and reduced gate drive requirements for high-voltage switching in industrial power supplies and motor controls.

For engineers reviewing the IRFI840GLC datasheet, IRFI840GLC pinout, IRFI840GLC application, or IRFI840GLC equivalent, key selection considerations include its isolated TO-220 FULLPAK thermal performance (R_thJC = 3.1 °C/W), repetitive avalanche rating (I_AR = 4.5 A), body diode recovery time (t_rr = 490–740 ns), and gate charge profile optimized for hard-switched SMPS topologies.

Technical Context

This device employs advanced planar silicon process technology to achieve ultra-low gate charge (Q_g = 39 nC) and low output capacitance (C_oss = 170 pF), enabling faster switching transitions and reduced switching losses in 250–400 V DC-link applications. Its ruggedness is validated by 300 mJ unclamped inductive avalanche energy and 4.5 A repetitive avalanche current under defined test conditions.

The TO-220 FULLPAK package integrates high-voltage isolation (2.5 kV_RMS, 60 s) with sink-to-lead creepage of 4.8 mm and low thermal resistance - critical for designs requiring reinforced insulation without external insulators in AC/DC front-ends and offline converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - supports 400 V DC-link operation with 25 % margin for surge and ringing
R_DS(on)	0.85 Ω @ V_GS = 10 V - enables <4.3 W conduction loss at 4.5 A continuous drain current
Q_g	39 nC - reduces gate driver power demand and allows use of lower-cost 10 V logic-level drivers
E_AS	300 mJ - sustains unclamped inductive turn-off events in relay/snubberless flyback designs
t_rr	490–740 ns - limits diode reverse recovery loss and EMI in hard-switched converters
R_thJC	3.1 °C/W - permits 40 W dissipation with ≤124 °C junction rise above 25 °C case temperature
V_GS	±30 V - withstands gate transients in noisy industrial environments without clamping circuitry

Pinout & Package

IRFI840GLC uses the TO-220 FULLPAK package: isolated plastic housing with integral heatsink tab (drain-connected), 3-pin through-hole configuration, and 4.8 mm minimum creepage between sink and leads. Dimensions conform to Vishay Document 91359 (Option 1 or 2, facility code '9' or 'Y').

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control terminal	Accepts 10 V logic-level drive; ±30 V rating eliminates need for gate clamps in most layouts
D (Drain)	Main power output / heatsink tab	Internally connected to isolated metal tab; rated for 2.5 kV_RMS isolation from leads
S (Source)	Power return / reference node	Provides low-inductance source path; internal L_S = 7.5 nH impacts high-dI/dt switching behavior

Key Features

Feature	Design Value
Ultra-low Q_g (39 nC)	Reduces gate driver power consumption by >40 % vs. legacy 500 V MOSFETs, easing thermal design of driver ICs
2.5 kV_RMS isolation	Eliminates need for insulating pads or sleeves in TO-220 mounting, reducing BOM count and assembly steps
Repetitive avalanche rated (I_AR = 4.5 A)	Enables reliable operation in circuits with inductive load switching without external snubbers
Enhanced V_GS rating (±30 V)	Improves immunity to gate voltage overshoot during fast switching, increasing system robustness
Low C_oss (170 pF)	Minimizes capacitive turn-off loss and improves efficiency in high-frequency hard-switched topologies

Applications

Industrial AC/DC Power Supplies	Offline Switch-Mode Power Supplies
Use Scenario: Primary-side switch in 50–150 W universal-input flyback converters with 400 V DC bus. IC Role / Device Role / Timing Role: High-voltage switching transistor handling full mains-referred power conversion. Use Value: 300 mJ E_AS absorbs leakage inductance energy during MOSFET turn-off, eliminating need for RCD clamp.	Use Scenario: Main switch in 200–300 W LLC resonant half-bridge PFC front-end stages. IC Role / Device Role / Timing Role: Fast-switching, avalanche-rugged primary switch operating at 65–100 kHz. Use Value: 39 nC Q_g and 170 pF C_oss reduce switching loss and improve light-load efficiency over standard 500 V MOSFETs.
Motor Drive Inverters	High-Voltage DC-DC Converters
Use Scenario: Low-side switch in 24–48 V BLDC motor controllers with 500 V bus protection. IC Role / Device Role / Timing Role: Sustained-current switching element managing PWM commutation and regenerative braking. Use Value: 4.5 A I_D continuous and 18 A I_DM pulsed support peak torque demands while maintaining thermal stability.	Use Scenario: Primary switch in isolated 48 V–400 V step-up DC-DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: High-efficiency, high-reliability power switch in hard-switched forward or push-pull topologies. Use Value: 2.5 kV_RMS isolation and 4.8 mm creepage meet reinforced insulation requirements per IEC 62368-1 without additional barriers.

Industrial AC/DC Power Supplies

Offline Switch-Mode Power Supplies

Use Scenario: Primary-side switch in 50–150 W universal-input flyback converters with 400 V DC bus.

IC Role / Device Role / Timing Role: High-voltage switching transistor handling full mains-referred power conversion.

Use Value: 300 mJ E_AS absorbs leakage inductance energy during MOSFET turn-off, eliminating need for RCD clamp.

Use Scenario: Main switch in 200–300 W LLC resonant half-bridge PFC front-end stages.

IC Role / Device Role / Timing Role: Fast-switching, avalanche-rugged primary switch operating at 65–100 kHz.

Use Value: 39 nC Q_g and 170 pF C_oss reduce switching loss and improve light-load efficiency over standard 500 V MOSFETs.

Motor Drive Inverters

High-Voltage DC-DC Converters

Use Scenario: Low-side switch in 24–48 V BLDC motor controllers with 500 V bus protection.

IC Role / Device Role / Timing Role: Sustained-current switching element managing PWM commutation and regenerative braking.

Use Value: 4.5 A I_D continuous and 18 A I_DM pulsed support peak torque demands while maintaining thermal stability.

Use Scenario: Primary switch in isolated 48 V–400 V step-up DC-DC converters for telecom and server PSUs.

IC Role / Device Role / Timing Role: High-efficiency, high-reliability power switch in hard-switched forward or push-pull topologies.

Use Value: 2.5 kV_RMS isolation and 4.8 mm creepage meet reinforced insulation requirements per IEC 62368-1 without additional barriers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP5NK50ZFP	500 V, 4.5 A, R_DS(on) = 1.2 Ω, Q_g = 22 nC, non-isolated TO-220FP	Lacks 2.5 kV_RMS isolation and creepage; requires external insulator for high-voltage mounting	Select when isolation is handled at board level and lower Q_g is prioritized over ruggedness
IXTP50N10P	100 V, 50 A, R_DS(on) = 0.022 Ω, TO-220 - not voltage-compatible	Cannot replace IRFI840GLC in 400 V bus applications due to insufficient V_DS rating	Only suitable for low-voltage (<120 V) high-current applications; not a functional alternative for IRFI840GLC's target use cases

Compared with STP5NK50ZFP, IRFI840GLC trades slightly higher R_DS(on) for certified isolation and superior avalanche ruggedness; compared with IXTP50N10P, it provides essential 500 V rating but at lower current capacity - making IRFI840GLC uniquely suited for isolated, medium-power, high-voltage switching where safety and reliability are non-negotiable.

Availability

IRFI840GLC is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, offline switch-mode power supplies, and motor drive inverters requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IRFI840GLC 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 demanding industrial, automotive, and computing applications.

The IRFI840GLC belongs to Vishay's high-voltage isolated MOSFET product line, engineered specifically for safety-critical, high-isolation switching applications such as medical power supplies, industrial PLCs, and telecom rectifiers where reinforced insulation and avalanche endurance are mandatory.

FAQ

What is the maximum continuous drain current rating for IRFI840GLC at 100 °C case temperature?

The IRFI840GLC has a continuous drain current rating of 2.9 A at T_C = 100 °C, derated linearly from 4.5 A at 25 °C using a factor of 0.32 W/°C. This value reflects thermal limits under real-world heatsinking conditions and must be verified against actual PCB layout and ambient airflow in the final design. The IRFI840GLC datasheet specifies this limit in the Absolute Maximum Ratings table on page 1.

Does IRFI840GLC require an external gate resistor for safe operation?

The IRFI840GLC does not mandate an external gate resistor for basic functionality, but a series gate resistor (typically 5–25 Ω) is recommended to control dV/dt and suppress oscillation during switching. The datasheet's switching time test circuit (Fig. 10a) uses R_G = 9.1 Ω, and the device's low gate input resistance (0.7–3.7 Ω) makes it sensitive to ringing without proper gate drive impedance matching. Use of IRFI840GLC without a gate resistor may cause shoot-through or EMI in high-speed applications.

Can IRFI840GLC be used in place of a standard TO-220 MOSFET without layout changes?

No - IRFI840GLC uses the TO-220 FULLPAK package, which has identical footprint and lead spacing to standard TO-220 but features an electrically isolated metal tab. While mechanical mounting is compatible, the isolation means the tab (drain) can be directly bolted to a grounded heatsink without insulating hardware. Layout changes are not required for footprint, but grounding strategy and thermal interface design differ significantly from non-isolated TO-220 devices. Always verify creepage and clearance per IRFI840GLC's 4.8 mm sink-to-lead specification.

What is the typical body diode reverse recovery charge (Q_rr) for IRFI840GLC?

The typical body diode reverse recovery charge (Q_rr) for IRFI840GLC is 3.0–4.5 μC, measured at T_J = 25 °C, I_F = 8.0 A, and dI/dt = 100 A/μs. This parameter directly impacts conduction loss and EMI in synchronous rectification or freewheeling paths. Because Q_rr increases with temperature, designs operating near 150 °C junction must account for degradation - the IRFI840GLC datasheet specifies Q_rr in the "Drain-Source Body Diode Characteristics" section on page 2.

Is IRFI840GLC RoHS-compliant and lead-free?

Yes, IRFI840GLC is RoHS-compliant and lead-free, as confirmed by its ordering suffix "PbF" (IRFI840GLCPbF) and Vishay's material categorization documentation (www.vishay.com/doc?99912). The device meets JEDEC J-STD-609A Class 1 marking requirements and is qualified for reflow soldering up to 300 °C peak temperature for 10 seconds. Full compliance data, including substance declarations and test reports, are accessible via Vishay's PPAP portal using document number 91160.

IRFI840GLC 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):: 500 V

Current - Continuous Drain (Id) @ 25°C:: 4.5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 850mOhm @ 2.7A, 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

IRFI840GLC FAQ

1.How can I place an order for IRFI840GLC through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFI840GLC 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 IRFI840GLC reliable?

The price and inventory of IRFI840GLC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFI840GLC is usually 5 days.

3.What payment methods are accepted for IRFI840GLC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFI840GLC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFI840GLC?

IRFI840GLC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFI840GLC 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 IRFI840GLC?

For technical support, including IRFI840GLC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFI840GLC requirements.

6.How does Aetrix verify that IRFI840GLC is sourced from the original manufacturer or authorized distributors?

All IRFI840GLC 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 IRFI840GLC meets industry standards.

7.What is the process for return or replacement of IRFI840GLC?

All IRFI840GLC units undergo pre-shipment inspection (PSI). If there is an issue with IRFI840GLC, 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 IRFI840GLC part is unused and in its original packaging.

Return procedure for IRFI840GLC:

1.Submit a request within 90 days.

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

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