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

Vishay Siliconix IRFR420TR

Name: IRFR420TR
Brand: Vishay Siliconix
SKU: IRFR420TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFR420TR

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

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

Datasheet:: IRFR420TR.pdf

Description:: MOSFET N-CH 500V 2.4A DPAK

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Product details

Overview

IRFR420TR from Vishay Siliconix is a 500 V, 2.4 A N-channel surface-mount power MOSFET in DPAK (TO-252) package, featuring 3.0 Ω R_DS(on) at V_GS = 10 V, 19 nC total gate charge, and repetitive avalanche rating-designed for high-voltage DC-DC converters, offline SMPS primary-side switching, and industrial motor control.

For engineers reviewing the IRFR420TR datasheet, IRFR420TR pinout, IRFR420TR application, or IRFR420TR equivalent, key selection criteria include its 500 V blocking capability, 42 W T_C power dissipation, dV/dt ruggedness of 3.5 V/ns, and compatibility with standard DPAK PCB footprints and reflow profiles.

Technical Context

This device belongs to Vishay's third-generation high-voltage power MOSFET family optimized for fast switching and avalanche robustness. Its planar stripe cell structure delivers stable R_DS(on) over temperature and low gate charge (Q_g = 19 nC, Q_gd = 13 nC), enabling efficient hard-switched topologies up to several hundred kHz.

The integrated body diode exhibits t_rr = 260–520 ns and Q_rr = 0.70–1.4 μC at I_F = 2.1 A, supporting moderate-frequency freewheeling in flyback and forward converters. Thermal resistance R_thJC = 3.0 °C/W enables direct heatsink mounting for high-power operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - supports 400 V DC bus designs with 25 % margin for voltage spikes
R_DS(on) @ V_GS = 10 V	3.0 Ω - determines conduction loss in continuous current paths up to 2.4 A
Q_g	19 nC - defines gate drive energy requirement and switching speed in hard-switched circuits
E_AS	400 mJ - enables unclamped inductive switching without failure under defined test conditions
P_D @ T_C = 25 °C	42 W - achievable with direct case-to-heatsink thermal path, not PCB-only mounting
dV/dt Rating	3.5 V/ns - ensures immunity to parasitic turn-on during high dv/dt transients in bridge configurations
T_J Range	−55 to +150 °C - supports operation in industrial ambient environments with derating

Pinout & Package

DPAK (TO-252) surface-mount package with exposed drain pad for thermal and electrical connection; 3-pin configuration optimized for high-current, high-voltage switching applications.

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control input	Receives 10 V logic-level drive; threshold V_GS(th) = 2.0–4.0 V ensures reliable turn-on with standard gate drivers
D (Drain)	High-voltage output node	Connected to 500 V rail; electrically and thermally tied to exposed backside metal pad
S (Source)	Power return / reference	Serves as local ground reference for gate drive; carries full load current and body diode reverse recovery charge

Key Features

Feature	Design Value
Repetitive avalanche rated	Enables reliable operation under transient overloads (I_AR = 2.4 A, E_AR = 4.2 mJ) without derating or external snubbers
Dynamic dV/dt rating	3.5 V/ns immunity prevents false triggering in high-speed half-bridge or LLC resonant converter nodes
Low Q_gd/Q_g ratio	68 % (13/19 nC) reduces Miller-induced switching delay and improves controllability in high-frequency PWM
Surface-mount (DPAK)	Compatible with automated assembly and vapor-phase/reflow soldering; thermal pad enables >30 W dissipation on 1" FR-4 PCB
Fast body diode recovery	t_rr = 260 ns typical allows use in discontinuous conduction mode (DCM) flyback without significant switching loss penalty

Applications

Offline AC-DC Adapters	Industrial DC-DC Converters
Use Scenario: 50–100 W universal-input (85–265 V_AC) flyback converter powering industrial sensors and PLC I/O modules. IC Role / Device Role / Timing Role: Primary-side high-side switch operating in DCM at 65–130 kHz, handling peak drain currents up to 2.4 A. Use Value: 500 V rating accommodates reflected output voltage plus line surge; 3.0 Ω R_DS(on) keeps conduction loss below 180 mW at full load.	Use Scenario: 48 V input to ±15 V dual-output forward converter for servo amplifier gate drivers. IC Role / Device Role / Timing Role: Main power switch in active-clamp forward topology, switching at 200 kHz with 50 % duty cycle. Use Value: Repetitive avalanche rating absorbs clamp energy; 19 nC Q_g enables clean turn-off with 10 Ω gate resistor and minimal overshoot.
LED Driver Power Stages	Motor Control H-Bridge Legs
Use Scenario: Constant-current buck-boost LED driver for street lighting (30–60 V_OUT, 1.5 A), operating from rectified 230 V_AC. IC Role / Device Role / Timing Role: High-side switch in buck-boost controller IC interface, handling 500 V transients during mains dropout. Use Value: 400 mJ single-pulse avalanche energy withstands line dips and capacitor discharge events without failure.	Use Scenario: Low-side switch in 24 V brushed DC motor H-bridge for HVAC actuators, requiring bidirectional current control and regenerative braking. IC Role / Device Role / Timing Role: Synchronous rectifier and freewheeling path via body diode during PWM off-time. Use Value: Body diode V_SD = 1.6 V at 2.4 A minimizes conduction loss during regeneration; t_rr < 520 ns avoids shoot-through in 20 kHz PWM.

Offline AC-DC Adapters

Industrial DC-DC Converters

Use Scenario: 50–100 W universal-input (85–265 V_AC) flyback converter powering industrial sensors and PLC I/O modules.

IC Role / Device Role / Timing Role: Primary-side high-side switch operating in DCM at 65–130 kHz, handling peak drain currents up to 2.4 A.

Use Value: 500 V rating accommodates reflected output voltage plus line surge; 3.0 Ω R_DS(on) keeps conduction loss below 180 mW at full load.

Use Scenario: 48 V input to ±15 V dual-output forward converter for servo amplifier gate drivers.

IC Role / Device Role / Timing Role: Main power switch in active-clamp forward topology, switching at 200 kHz with 50 % duty cycle.

Use Value: Repetitive avalanche rating absorbs clamp energy; 19 nC Q_g enables clean turn-off with 10 Ω gate resistor and minimal overshoot.

LED Driver Power Stages

Motor Control H-Bridge Legs

Use Scenario: Constant-current buck-boost LED driver for street lighting (30–60 V_OUT, 1.5 A), operating from rectified 230 V_AC.

IC Role / Device Role / Timing Role: High-side switch in buck-boost controller IC interface, handling 500 V transients during mains dropout.

Use Value: 400 mJ single-pulse avalanche energy withstands line dips and capacitor discharge events without failure.

Use Scenario: Low-side switch in 24 V brushed DC motor H-bridge for HVAC actuators, requiring bidirectional current control and regenerative braking.

IC Role / Device Role / Timing Role: Synchronous rectifier and freewheeling path via body diode during PWM off-time.

Use Value: Body diode V_SD = 1.6 V at 2.4 A minimizes conduction loss during regeneration; t_rr < 520 ns avoids shoot-through in 20 kHz PWM.

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
STP5NK50ZFP	500 V, 4.5 A, R_DS(on) = 1.4 Ω, Q_g = 17 nC, TO-220FP package	Higher current rating but through-hole only; no surface-mount option	Select when higher continuous current (>2.4 A) is required and board space permits leaded mounting.
SiHFR420TR-GE3	Same die, identical specs, Vishay halogen-free variant in same DPAK package	No functional difference; RoHS-compliant material set only	Select when lead-free/halogen-free compliance is mandated by end-product environmental requirements.

Compared with STP5NK50ZFP and SiHFR420TR-GE3, the IRFR420TR offers identical electrical performance in a surface-mount DPAK package with legacy PbF marking, making it optimal for cost-sensitive, space-constrained industrial power supplies where tape-and-reel automation is required.

Availability

IRFR420TR is available at Aetrix Electronics and suitable for offline AC-DC adapters, industrial DC-DC converters, and motor control H-bridge legs requiring stable component supply across extended production lifecycles.

Supply support for IRFR420TR 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 power MOSFETs, diodes, and optoelectronics for industrial, automotive, and computing markets.

The IRFR420TR belongs to Vishay's third-generation high-voltage power MOSFET product line, engineered for rugged switching in offline power supplies and industrial motor drives where avalanche tolerance and dV/dt immunity are critical.

FAQ

What is the maximum continuous drain current for IRFR420TR at 100 °C case temperature?

The IRFR420TR supports 1.5 A continuous drain current at T_C = 100 °C, per its Absolute Maximum Ratings table. This derating reflects thermal limits of the DPAK package when mounted on a heatsink or thermally enhanced PCB. At T_C = 25 °C, the rating rises to 2.4 A. Designers must verify junction temperature using R_thJC = 3.0 °C/W and actual power dissipation to ensure T_J stays within −55 to +150 °C range.

Does IRFR420TR have a specified body diode reverse recovery time (t_rr)?

Yes, the IRFR420TR datasheet specifies t_rr = 260–520 ns at T_J = 25 °C, I_F = 2.1 A, and dI/dt = 100 A/μs. This parameter is critical for evaluating switching losses in flyback and forward converters where the body diode conducts during dead time. The wide range reflects process variation and test condition sensitivity; design margins should use the upper bound.

Is IRFR420TR pin-compatible with other DPAK-packaged 500 V MOSFETs like STP5NK50ZFP?

No, IRFR420TR is not pin-compatible with STP5NK50ZFP because the latter uses TO-220FP (through-hole) packaging, while IRFR420TR uses DPAK (TO-252) surface-mount packaging. Pin count and physical layout differ fundamentally: IRFR420TR has G-D-S in DPAK outline, whereas STP5NK50ZFP has G-D-S in vertical TO-220FP leadform. PCB footprint and assembly process are incompatible.

What is the gate-source threshold voltage (V_GS(th)) range for IRFR420TR?

The IRFR420TR has a gate-source threshold voltage range of 2.0 V to 4.0 V at V_DS = V_GS and I_D = 250 μA. This means the device begins conducting significantly above 2.0 V and is fully enhanced near 4.0 V under standard test conditions. For robust turn-on in noisy environments, gate drive should exceed 10 V to ensure low R_DS(on) and minimize conduction loss.

Can IRFR420TR be used in avalanche-mode operation, and what are the limits?

Yes, IRFR420TR is explicitly repetitive avalanche rated: I_AR = 2.4 A and E_AR = 4.2 mJ, with pulse width limited by maximum junction temperature. Single-pulse avalanche energy is rated at 400 mJ. Operation in avalanche requires strict adherence to the test conditions in Figure 12 (L = 124 mH, R_g = 25 Ω, V_DD = 50 V), and thermal management must prevent T_J exceeding 150 °C during repeated events.

IRFR420TR Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 500 V

Current - Continuous Drain (Id) @ 25°C:: 2.4A (Tc)

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

Rds On (Max) @ Id, Vgs:: 3Ohm @ 1.4A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 19 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 360 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

IRFR420TR FAQ

1.How can I place an order for IRFR420TR through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFR420TR 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 IRFR420TR reliable?

The price and inventory of IRFR420TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFR420TR is usually 5 days.

3.What payment methods are accepted for IRFR420TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFR420TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFR420TR?

IRFR420TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFR420TR 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 IRFR420TR?

For technical support, including IRFR420TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFR420TR requirements.

6.How does Aetrix verify that IRFR420TR is sourced from the original manufacturer or authorized distributors?

All IRFR420TR 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 IRFR420TR meets industry standards.

7.What is the process for return or replacement of IRFR420TR?

All IRFR420TR units undergo pre-shipment inspection (PSI). If there is an issue with IRFR420TR, 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 IRFR420TR part is unused and in its original packaging.

Return procedure for IRFR420TR:

1.Submit a request within 90 days.

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

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