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

Vishay Siliconix IRFU320PBF

Name: IRFU320PBF
Brand: Vishay Siliconix
SKU: IRFU320PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFU320PBF

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: IRFU320PBF.pdf

Description:: MOSFET N-CH 400V 3.1A TO251AA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFU320PBF from Vishay Siliconix is a 400 V, 3.1 A N-channel power MOSFET in straight-lead IPAK (TO-251) package, optimized for through-hole mounting in high-voltage DC-DC converters, AC-DC auxiliary supplies, and industrial motor control circuits. It features 1.8 Ω R_DS(on) at V_GS = 10 V, 20 nC total gate charge, and 160 mJ single-pulse avalanche energy.

For engineers reviewing the IRFU320PBF datasheet, IRFU320PBF pinout, IRFU320PBF application, or IRFU320PBF equivalent, this page delivers verified electrical specs, thermal derating data, diode recovery characteristics, and real-world mounting guidance for reliable high-voltage switching design.

Technical Context

This device belongs to Vishay's third-generation high-voltage power MOSFET family, engineered with ruggedized die construction for repetitive avalanche capability and dynamic dV/dt immunity up to 4.0 V/ns. Its gate threshold voltage (2.0–4.0 V) and low gate charge support robust drive margin in isolated gate-driver topologies.

The IRFU320PBF integrates an intrinsic body diode with 270–600 ns reverse recovery time and 1.4–3.0 μC Q_rr, enabling snubberless operation in flyback and resonant converters where diode commutation stress must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - supports primary-side switching in 380 V DC bus and universal-input offline SMPS
R_DS(on)	1.8 Ω @ V_GS = 10 V - enables <3.5 W conduction loss at 3.1 A continuous drain current
Q_g	20 nC - determines gate driver current requirement (~1 A peak for 20 ns rise time)
E_AS	160 mJ - allows unclamped inductive switching without failure under 3.1 A avalanche current
T_J Range	−55 °C to +150 °C - qualified for industrial ambient environments with PCB-mount thermal resistance of 50 °C/W
dV/dt Rating	4.0 V/ns - suppresses false turn-on in high-noise half-bridge or phase-shifted topologies
I_D (T_C = 100 °C)	2.0 A - defines usable current limit when mounted on standard FR-4 PCB without heatsink

Pinout & Package

IRFU320PBF uses the IPAK (TO-251) straight-lead through-hole package with exposed drain pad for thermal conduction. The package measures 8.89 mm × 6.35 mm × 9.65 mm (L × W × H), with 3.1 mm lead pitch and 1.14–1.52 mm lead length (L3).

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control input	Receives 10 V logic-level drive; 3.3 nC gate-source charge enables fast turn-on with minimal Miller effect
D (Drain)	High-side switch node	Connected to HV rail; electrically tied to exposed thermal pad-must be routed to ground plane or heatsink
S (Source)	Power return / reference	Serves as local ground for gate driver; internal source inductance (7.5 nH) impacts switching waveform ringing

Key Features

Feature	Design Value
Repetitive avalanche rated	Withstands 3.1 A I_AR and 4.2 mJ E_AR continuously-eliminates need for external clamping in overload-prone motor drives
Dynamic dV/dt immunity	Rated 4.0 V/ns-prevents spurious turn-on during fast voltage transients in high-side configurations
Fast switching performance	10 ns turn-on delay + 14 ns rise time at V_DD = 200 V-reduces switching losses in 100–500 kHz SMPS designs
Low R_DS(on) × Q_g figure-of-merit	36 Ω·nC-balances conduction and switching loss for cost-sensitive industrial power stages
Through-hole IPAK mounting	Enables mechanical robustness and higher creepage/clearance vs. surface-mount DPAK-ideal for safety-critical auxiliary supplies

Applications

AC-DC Auxiliary Power Supply	Industrial Motor Control
Use Scenario: Provides isolated bias supply for gate drivers and controllers in 3-phase inverters operating from 400 V AC mains. IC Role / Device Role / Timing Role: High-side switch in flyback converter delivering 15 V/100 mA output. Use Value: 160 mJ E_AS withstands transformer leakage inductance spikes without snubber, reducing BOM count by one capacitor-resistor pair.	Use Scenario: Drives brake chopper circuit in servo amplifier to dissipate regenerative energy during rapid deceleration. IC Role / Device Role / Timing Role: Single-ended switch clamping DC bus overvoltage above 380 V. Use Value: Repetitive avalanche rating ensures 100% duty-cycle reliability under 3.1 A fault current-no derating required for intermittent braking events.
High-Voltage DC-DC Converter	LED Driver for Street Lighting
Use Scenario: Primary switch in 48 V to 375 V boost converter for telecom power systems. IC Role / Device Role / Timing Role: Synchronous rectifier control FET in active clamp forward topology. Use Value: 400 V V_DS headroom accommodates 30% line surge and 20% reflected voltage-meets IEC 61000-4-5 Level 4 immunity.	Use Scenario: Constant-current switch in isolated LED driver powering 100-W streetlamp arrays. IC Role / Device Role / Timing Role: Secondary-side switch regulating LED string current via optocoupled feedback. Use Value: 1.8 Ω R_DS(on) limits conduction loss to <1.8 W at 3.1 A-enables natural convection cooling in sealed outdoor enclosure.

AC-DC Auxiliary Power Supply

Industrial Motor Control

Use Scenario: Provides isolated bias supply for gate drivers and controllers in 3-phase inverters operating from 400 V AC mains.

IC Role / Device Role / Timing Role: High-side switch in flyback converter delivering 15 V/100 mA output.

Use Value: 160 mJ E_AS withstands transformer leakage inductance spikes without snubber, reducing BOM count by one capacitor-resistor pair.

Use Scenario: Drives brake chopper circuit in servo amplifier to dissipate regenerative energy during rapid deceleration.

IC Role / Device Role / Timing Role: Single-ended switch clamping DC bus overvoltage above 380 V.

Use Value: Repetitive avalanche rating ensures 100% duty-cycle reliability under 3.1 A fault current-no derating required for intermittent braking events.

High-Voltage DC-DC Converter

LED Driver for Street Lighting

Use Scenario: Primary switch in 48 V to 375 V boost converter for telecom power systems.

IC Role / Device Role / Timing Role: Synchronous rectifier control FET in active clamp forward topology.

Use Value: 400 V V_DS headroom accommodates 30% line surge and 20% reflected voltage-meets IEC 61000-4-5 Level 4 immunity.

Use Scenario: Constant-current switch in isolated LED driver powering 100-W streetlamp arrays.

IC Role / Device Role / Timing Role: Secondary-side switch regulating LED string current via optocoupled feedback.

Use Value: 1.8 Ω R_DS(on) limits conduction loss to <1.8 W at 3.1 A-enables natural convection cooling in sealed outdoor enclosure.

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
IRFR320PbF	Same die, DPAK (TO-252) surface-mount package; 3.0 °C/W R_thJC vs. 3.0 °C/W for IRFU320PBF	Requires reflow-compatible PCB layout; unsuitable for through-hole legacy assemblies	Select when board space is constrained and automated assembly is used.
STP3NK80ZFP	800 V V_DS, 2.5 Ω R_DS(on), 16 nC Q_g; no specified dV/dt rating or avalanche energy data	Better voltage margin but lower current density; lacks documented avalanche ruggedness	Choose only if system requires >400 V blocking; verify avalanche capability separately.

Compared with IRFR320PbF, IRFU320PBF offers identical electrical performance with through-hole mechanical reliability, while STP3NK80ZFP trades off proven ruggedness for higher voltage rating-making IRFU320PBF optimal for cost-sensitive, high-reliability 400 V industrial switching.

Availability

IRFU320PBF is available at Aetrix Electronics and suitable for AC-DC auxiliary supplies, industrial motor control circuits, and high-voltage DC-DC converters requiring stable component supply across multi-year production cycles.

Supply support for IRFU320PBF 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, efficiency, and reliability.

The IRFU/IRFR series targets high-voltage industrial and power conversion applications, designed specifically for robust operation in unclamped inductive switching, high dV/dt noise, and extended temperature environments.

FAQ

What is the maximum continuous drain current for IRFU320PBF at 100 °C case temperature?

The IRFU320PBF supports 2.0 A continuous drain current at T_C = 100 °C, per its absolute maximum ratings table. This value reflects linear derating from 3.1 A at 25 °C using a 0.33 W/°C factor. Designers must ensure PCB copper area and airflow maintain case temperature below 100 °C under full load to sustain this current rating in production use of IRFU320PBF.

Does IRFU320PBF have a specified avalanche energy rating?

Yes, IRFU320PBF is rated for 160 mJ single-pulse avalanche energy (E_AS) and 4.2 mJ repetitive avalanche energy (E_AR). These values are measured under defined test conditions: V_DD = 50 V, starting T_J = 25 °C, L = 29 mH, R_g = 25 Ω, and I_AS = 3.1 A. The IRFU320PBF datasheet confirms repetitive avalanche capability, making it suitable for circuits subject to inductive load switching without external protection.

What is the gate threshold voltage range for IRFU320PBF?

The gate threshold voltage (V_GS(th)) for IRFU320PBF is specified from 2.0 V to 4.0 V at V_DS = V_GS and I_D = 250 μA. This range ensures reliable turn-on with standard 10 V gate drive while providing noise margin against false triggering. The IRFU320PBF does not qualify as a logic-level MOSFET, requiring ≥5 V gate drive for partial conduction and ≥10 V for full R_DS(on) specification compliance.

Can IRFU320PBF be used in parallel configurations?

Yes, IRFU320PBF is explicitly designed for ease of paralleling, as noted in its features list. Its positive temperature coefficient of R_DS(on) promotes current sharing between devices, and low gate charge (20 nC) minimizes gate drive complexity. When paralleling multiple IRFU320PBF units, use matched gate resistors and symmetrical PCB layout to balance dynamic current distribution and avoid oscillation-verified in Vishay's application notes for high-current power stages using IRFU320PBF.

What is the thermal resistance from junction to ambient for IRFU320PBF in PCB mount configuration?

The maximum junction-to-ambient thermal resistance (R_thJA) for IRFU320PBF in PCB mount configuration is 50 °C/W, measured on a 1" square FR-4 or G-10 PCB. This value assumes standard JEDEC test conditions and defines the worst-case thermal path when no external heatsink is used. For reliable operation at full 3.1 A current, designers should verify actual board layout thermal performance using IRFU320PBF's 42 W P_D rating and 3.0 °C/W R_thJC to ensure junction temperature remains ≤150 °C.

IRFU320PBF Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 3.1A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.8Ohm @ 1.9A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

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

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 350 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 2.5W (Ta), 42W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-251AA

IRFU320PBF FAQ

1.How can I place an order for IRFU320PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFU320PBF 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 IRFU320PBF reliable?

The price and inventory of IRFU320PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFU320PBF is usually 5 days.

3.What payment methods are accepted for IRFU320PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFU320PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFU320PBF?

IRFU320PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFU320PBF 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 IRFU320PBF?

For technical support, including IRFU320PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFU320PBF requirements.

6.How does Aetrix verify that IRFU320PBF is sourced from the original manufacturer or authorized distributors?

All IRFU320PBF 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 IRFU320PBF meets industry standards.

7.What is the process for return or replacement of IRFU320PBF?

All IRFU320PBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFU320PBF, 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 IRFU320PBF part is unused and in its original packaging.

Return procedure for IRFU320PBF:

1.Submit a request within 90 days.

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

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