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

Vishay Siliconix IRFR320

Name: IRFR320
Brand: Vishay Siliconix
SKU: IRFR320
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFR320

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: IRFR320.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFR320 from Vishay Siliconix is a 400 V, 3.1 A N-channel surface-mount power MOSFET in DPAK (TO-252) package, featuring 1.8 Ω R_DS(on) at V_GS = 10 V, 20 nC total gate charge, and repetitive avalanche rating-designed for high-voltage DC-DC converters, motor control stages, and industrial power supplies.

For engineers reviewing the IRFR320 datasheet, IRFR320 pinout, IRFR320 application, or IRFR320 equivalent, this page delivers verified electrical specs, thermal derating behavior, body diode recovery characteristics, and direct-mount PCB layout guidance per Vishay's recommended DPAK pad dimensions.

Technical Context

The IRFR320 employs third-generation trench-gate silicon technology optimized for rugged unclamped inductive switching, with 160 mJ single-pulse avalanche energy and 4.0 V/ns peak diode recovery dV/dt capability. Its dynamic parameters-including 11 nC Q_gd, 3.3 nC Q_gs, and 14 ns rise time-are characterized at V_DS = 320 V and I_D = 3.3 A.

Thermal design is constrained by R_thJC = 3.0 °C/W (junction-to-case) and R_thJA = 50 °C/W (junction-to-ambient on 1"² FR-4 PCB), enabling 2.5 W continuous dissipation without heatsink-making it suitable for compact, convection-cooled power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - supports input rails up to 320 V DC in offline SMPS or HV battery systems
R_DS(on)	1.8 Ω @ V_GS = 10 V - limits conduction loss to ≤10.5 W at 3.1 A continuous drain current
Q_g	20 nC - determines gate drive power requirement and switching speed under 18 Ω R_g
I_D (T_C = 100 °C)	2.0 A - defines usable current in thermally constrained PCB-mount applications
E_AS	160 mJ - enables reliable operation in unclamped inductive turn-off events (e.g., relay/snubberless solenoid drivers)
V_SD	1.6 V @ I_S = 3.1 A - sets forward drop and self-heating of integrated body diode during freewheeling
trr	270–600 ns - impacts reverse recovery loss and EMI in hard-switched topologies

Pinout & Package

DPAK (TO-252) surface-mount package with exposed drain tab for thermal conduction to PCB copper; 3-pin configuration with G–D–S terminal order viewed from top (marking side), compatible with vapor-phase and wave soldering per Vishay S21-0771-Rev. F.

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control electrode	Accepts 10 V logic-level drive; ±20 V absolute max rating prevents oxide damage
D (Drain)	High-side power output	Exposed metal tab-must be connected to high-current ground plane or heatsink for thermal management
S (Source)	Reference node / return path	Provides low-impedance return for load current and gate drive loop; ties to power ground

Key Features

Feature	Design Value
Repetitive avalanche rated	Supports ≥3.1 A I_AR and 4.2 mJ E_AR without degradation-eliminates need for external snubbers in inductive loads
Dynamic dV/dt rating	4.0 V/ns immunity ensures robustness against parasitic turn-on during high-speed switching transitions
Fast switching	10 ns turn-on delay + 14 ns rise time enables >100 kHz operation in flyback and forward converters
Surface-mount (DPAK)	Enables automated assembly and thermal coupling to PCB copper; requires 0.224" × 0.420" minimum pad per Application Note 826
Low Q_gd/Q_g ratio	11/20 = 55% - improves Miller immunity and reduces risk of shoot-through in half-bridge configurations

Applications

Industrial Motor Control	Offline AC-DC Power Supplies
Use Scenario: Driving 24–48 V brushed DC motors in PLC I/O modules with PWM at 20–50 kHz. IC Role / Device Role / Timing Role: High-side switch controlling motor voltage; handles repetitive inductive kickback during commutation. Use Value: 160 mJ E_AS and 3.1 A I_AR allow direct replacement of discrete snubber networks, reducing BOM count and board area.	Use Scenario: Secondary-side synchronous rectification in 36–72 V telecom PSUs operating at 100–300 kHz. IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diodes; body diode conducts during dead-time. Use Value: 1.6 V V_SD and 270 ns trr minimize conduction and recovery losses, improving efficiency by 1.2–1.8% over 40 V Schottkys.
DC-DC Converters	Lighting Ballasts
Use Scenario: Primary-side switch in isolated 400 V input, 12 V output flyback converters for industrial sensors. IC Role / Device Role / Timing Role: Main power switch handling 320 V V_DS stress and 3.3 A peak current pulses. Use Value: 400 V V_DS rating and 1.8 Ω R_DS(on) enable >85% efficiency at full load without active cooling.	Use Scenario: Lamp current regulation in electronic HID ballasts with 300–400 V DC bus. IC Role / Device Role / Timing Role: Series-pass switch modulating lamp power via phase-cut or burst-mode control. Use Value: Repetitive avalanche capability sustains operation during open-circuit lamp faults, preventing catastrophic failure.

Industrial Motor Control

Offline AC-DC Power Supplies

Use Scenario: Driving 24–48 V brushed DC motors in PLC I/O modules with PWM at 20–50 kHz.

IC Role / Device Role / Timing Role: High-side switch controlling motor voltage; handles repetitive inductive kickback during commutation.

Use Value: 160 mJ E_AS and 3.1 A I_AR allow direct replacement of discrete snubber networks, reducing BOM count and board area.

Use Scenario: Secondary-side synchronous rectification in 36–72 V telecom PSUs operating at 100–300 kHz.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diodes; body diode conducts during dead-time.

Use Value: 1.6 V V_SD and 270 ns trr minimize conduction and recovery losses, improving efficiency by 1.2–1.8% over 40 V Schottkys.

DC-DC Converters

Lighting Ballasts

Use Scenario: Primary-side switch in isolated 400 V input, 12 V output flyback converters for industrial sensors.

IC Role / Device Role / Timing Role: Main power switch handling 320 V V_DS stress and 3.3 A peak current pulses.

Use Value: 400 V V_DS rating and 1.8 Ω R_DS(on) enable >85% efficiency at full load without active cooling.

Use Scenario: Lamp current regulation in electronic HID ballasts with 300–400 V DC bus.

IC Role / Device Role / Timing Role: Series-pass switch modulating lamp power via phase-cut or burst-mode control.

Use Value: Repetitive avalanche capability sustains operation during open-circuit lamp faults, preventing catastrophic failure.

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
SiHFR320-GE3	Same die, Pb-free/halogen-free packaging; identical R_DS(on), Q_g, and avalanche ratings	No functional difference; preferred for RoHS-compliant production	Select SiHFR320-GE3 when lead-free compliance is mandatory per IPC-J-STD-020 or customer spec
IRFU320PbF	Identical silicon but IPAK (TO-251) through-hole package; same V_DS, R_DS(on), and thermal specs	Requires manual or wave-soldered through-hole assembly; higher R_thJA (110 °C/W) limits power density	Choose IRFU320PbF only for legacy through-hole designs or prototyping where DPAK reflow is unavailable

Compared with IRFR320, SiHFR320-GE3 offers identical electrical performance with enhanced environmental compliance, while IRFU320PbF trades surface-mount scalability for mechanical robustness in low-volume or repair-sensitive applications-neither is pin-compatible due to differing packages (DPAK vs. IPAK).

Availability

IRFR320 is available at Aetrix Electronics and suitable for industrial motor control, offline AC-DC power supplies, and DC-DC converter designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IRFR320 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 and automotive applications.

The IRFR320 belongs to Vishay's third-generation high-voltage power MOSFET family, engineered specifically for ruggedized switching in unclamped inductive circuits and high-efficiency power conversion.

FAQ

What is the maximum continuous drain current for IRFR320 at 100 °C case temperature?

The IRFR320 supports 2.0 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derated value reflects thermal limitations of the DPAK package mounted on standard FR-4 PCB; exceeding this current without additional heatsinking risks junction temperature exceeding 150 °C. The IRFR320 datasheet confirms this rating applies under linear derating conditions with 0.33 W/°C slope above 25 °C.

Does IRFR320 require a gate resistor for safe operation in switching applications?

Yes, the IRFR320 requires an external gate resistor to control dI/dt and prevent oscillation or shoot-through. Vishay's switching characterization uses R_g = 18 Ω (Fig. 10), and the device's 20 nC Q_g means a 10 Ω resistor yields ~200 ns effective turn-on time. Without proper gate resistance, the IRFR320's low input capacitance (350 pF C_iss) and fast intrinsic switching can excite parasitic inductance in PCB traces.

Can IRFR320 be used in avalanche mode repeatedly without degradation?

Yes, the IRFR320 is explicitly rated for repetitive avalanche operation with I_AR = 3.1 A and E_AR = 4.2 mJ per pulse, provided pulse width and duty cycle remain within limits defined in Figure 11 of the datasheet. This capability is validated per JEDEC JESD24-11 and allows the IRFR320 to replace snubbers in relay drivers and inductive load switches without reliability penalty.

What is the recommended PCB pad layout for IRFR320 in DPAK package?

Vishay Application Note 826 specifies minimum DPAK pads for IRFR320: 0.224" × 0.420" (5.69 mm × 10.67 mm) for the drain thermal pad, with 0.055" (1.397 mm) clearance to adjacent traces. The gate and source pads should be ≥0.087" wide. These dimensions ensure adequate solder fillet formation and thermal conduction-critical since the IRFR320's R_thJA drops from 110 °C/W to 50 °C/W when using the recommended layout.

How does the body diode performance of IRFR320 compare to discrete Schottky diodes?

The IRFR320's integrated body diode has V_SD = 1.6 V at 3.1 A and t_rr = 270–600 ns, making it slower and higher-drop than most 40 V Schottky diodes (typically 0.4–0.6 V, <50 ns). However, its co-packaged integration eliminates layout parasitics and enables synchronous rectification in low-duty-cycle topologies where recovery loss is manageable. For high-frequency, high-efficiency designs, external Schottkys remain superior-but the IRFR320 body diode suffices for cost-sensitive, medium-frequency applications.

IRFR320 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

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:: 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:: Surface Mount

Supplier Device Package:: DPAK

IRFR320 FAQ

1.How can I place an order for IRFR320 through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFR320 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 IRFR320 reliable?

The price and inventory of IRFR320 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFR320 is usually 5 days.

3.What payment methods are accepted for IRFR320?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFR320 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFR320?

IRFR320 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFR320 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 IRFR320?

For technical support, including IRFR320 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFR320 requirements.

6.How does Aetrix verify that IRFR320 is sourced from the original manufacturer or authorized distributors?

All IRFR320 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 IRFR320 meets industry standards.

7.What is the process for return or replacement of IRFR320?

All IRFR320 units undergo pre-shipment inspection (PSI). If there is an issue with IRFR320, 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 IRFR320 part is unused and in its original packaging.

Return procedure for IRFR320:

1.Submit a request within 90 days.

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

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