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

Vishay Siliconix IRFR420TRL

Name: IRFR420TRL
Brand: Vishay Siliconix
SKU: IRFR420TRL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFR420TRL

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

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

Datasheet:: IRFR420TRL.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFR420TRL 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 auxiliary supplies, and industrial motor control interface stages.

For engineers reviewing the IRFR420TRL datasheet, IRFR420TRL pinout, IRFR420TRL application, or IRFR420TRL equivalent, this page delivers verified electrical specs, thermal derating behavior, body diode recovery performance (t_rr = 260–520 ns), and direct alternatives with documented parameter divergence for reliable high-voltage switching design.

Technical Context

This device belongs to Vishay's third-generation high-voltage power MOSFET family optimized for ruggedness and fast switching. It supports unclamped inductive switching with 400 mJ single-pulse avalanche energy and 4.2 mJ repetitive avalanche energy under defined conditions (I_AR = 2.4 A, T_J ≤ 150 °C).

The IRFR420TRL integrates a low-leakage body diode (I_DSS ≤ 25 μA at 500 V, 25 °C) and exhibits dynamic dV/dt immunity up to 3.5 V/ns-enabling stable operation in noisy high-side switch configurations without external snubbing in many medium-frequency applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - supports primary-side switching in 380 V DC bus and universal AC-input offline topologies
R_DS(on)	3.0 Ω @ V_GS = 10 V - enables <1.5 W conduction loss at 1.4 A continuous drain current
Q_g	19 nC - determines gate drive power requirement and switching speed in hard-switched 100–250 kHz designs
I_D (T_C = 25 °C)	2.4 A - defines maximum continuous current with heatsink; derates linearly to 1.5 A at 100 °C case temperature
E_AS	400 mJ - allows safe energy absorption during inductive turn-off transients without device failure
t_rr	260–520 ns - impacts reverse recovery losses and EMI in bridge-leg or synchronous rectifier configurations
R_thJC	3.0 °C/W - enables efficient heat transfer from die to PCB copper pour or heatsink in DPAK mounting

Pinout & Package

DPAK (TO-252) surface-mount package with exposed drain pad for thermal and electrical connection; compatible with vapor-phase, infrared, and wave soldering per JEDEC standards.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Controls channel conduction; requires ≥10 V drive for full enhancement; max ±20 V rating
D	Drain	High-voltage output terminal; electrically and thermally connected to exposed backside metal pad
S	Source	Reference node for gate drive and current sensing; forms return path for load current and body diode conduction

Key Features

Feature	Design Value
Repetitive avalanche rated	Withstands 2.4 A repetitive avalanche current and 4.2 mJ energy without degradation-reduces need for overvoltage clamping
Dynamic dV/dt immunity	Rated 3.5 V/ns-suppresses false turn-on in high dv/dt environments like half-bridge high-side operation
Fast switching	td(on) = 8.0 ns, tr = 8.6 ns, td(off) = 33 ns, tf = 16 ns-supports efficient 100–300 kHz switching with low transition losses
Low Q_gd/Q_g ratio	Q_gd = 13 nC of 19 nC total gate charge-improves Miller immunity and hard-switching robustness
Surface-mount (DPAK)	Enables automated assembly and high-power density layout with thermal pad soldered to PCB copper area

Applications

Industrial Motor Control Interface	Offline SMPS Auxiliary Supply
Use Scenario: Driving optocoupler input or small relay coil in variable-frequency drive (VFD) control logic, operating from 300–400 V DC bus. IC Role / Device Role / Timing Role: High-side N-channel switch controlling isolated feedback or enable signal path. Use Value: 500 V V_DS rating ensures margin against bus transients; 3.0 Ω R_DS(on) limits self-heating at 20–50 mA load current.	Use Scenario: Providing bias supply to PWM controller IC in flyback or forward converter, powered directly from rectified AC line. IC Role / Device Role / Timing Role: Primary-side startup switch enabling initial capacitor charging before auxiliary winding takes over. Use Value: Repetitive avalanche capability absorbs leakage inductance spikes during startup; 400 mJ E_AS prevents failure during no-load surges.
DC-DC Converter High-Side Switch	AC-DC Adapter Protection Stage
Use Scenario: High-side switch in non-isolated buck or SEPIC regulator for industrial sensor power rail generation from 24–48 V input. IC Role / Device Role / Timing Role: Main power switch modulating input voltage to regulated output; operates at 200–300 kHz. Use Value: Low Q_g (19 nC) and fast switching reduce driver loss and improve efficiency; dV/dt immunity avoids spurious turn-on.	Use Scenario: Overvoltage crowbar or surge protection switch in Class II AC-DC adapters handling transient line surges up to 600 V. IC Role / Device Role / Timing Role: Fast-acting shunt element triggered by transient voltage detector to clamp excess energy. Use Value: 3.5 V/ns dV/dt rating ensures reliable triggering without false activation; 500 V V_DS withstands IEC 61000-4-5 surge test levels.

Industrial Motor Control Interface

Offline SMPS Auxiliary Supply

Use Scenario: Driving optocoupler input or small relay coil in variable-frequency drive (VFD) control logic, operating from 300–400 V DC bus.

IC Role / Device Role / Timing Role: High-side N-channel switch controlling isolated feedback or enable signal path.

Use Value: 500 V V_DS rating ensures margin against bus transients; 3.0 Ω R_DS(on) limits self-heating at 20–50 mA load current.

Use Scenario: Providing bias supply to PWM controller IC in flyback or forward converter, powered directly from rectified AC line.

IC Role / Device Role / Timing Role: Primary-side startup switch enabling initial capacitor charging before auxiliary winding takes over.

Use Value: Repetitive avalanche capability absorbs leakage inductance spikes during startup; 400 mJ E_AS prevents failure during no-load surges.

DC-DC Converter High-Side Switch

AC-DC Adapter Protection Stage

Use Scenario: High-side switch in non-isolated buck or SEPIC regulator for industrial sensor power rail generation from 24–48 V input.

IC Role / Device Role / Timing Role: Main power switch modulating input voltage to regulated output; operates at 200–300 kHz.

Use Value: Low Q_g (19 nC) and fast switching reduce driver loss and improve efficiency; dV/dt immunity avoids spurious turn-on.

Use Scenario: Overvoltage crowbar or surge protection switch in Class II AC-DC adapters handling transient line surges up to 600 V.

IC Role / Device Role / Timing Role: Fast-acting shunt element triggered by transient voltage detector to clamp excess energy.

Use Value: 3.5 V/ns dV/dt rating ensures reliable triggering without false activation; 500 V V_DS withstands IEC 61000-4-5 surge test levels.

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
IRFR430TRL	V_DS = 500 V, R_DS(on) = 2.7 Ω (lower), Q_g = 22 nC (higher), same DPAK package	Better conduction loss but higher gate drive demand; may increase switching loss at >200 kHz	Prefer when conduction loss dominates and gate drive strength permits higher Q_g
SiHFR420-GE3	Same V_DS, R_DS(on), Q_g, and thermal specs; Pb-free/halogen-free construction per JEDEC J-STD-609	No functional difference; differs only in material compliance and tape/reel packaging standard	Select for RoHS-compliant production requiring GE3 suffix and lead-free process compatibility

Compared with IRFR420TRL, IRFR430TRL offers lower on-resistance at the cost of increased gate charge, while SiHFR420-GE3 matches all electrical parameters but meets stricter environmental compliance-making it suitable for export-focused or medical-grade BOMs where material declarations are mandatory.

Availability

IRFR420TRL is available at Aetrix Electronics and suitable for industrial motor control interfaces, offline SMPS auxiliary supplies, and DC-DC converter high-side switches requiring stable component supply across extended production cycles.

Supply support for IRFR420TRL 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 IRFR420TRL belongs to Vishay's third-generation high-voltage power MOSFET product line, engineered for demanding industrial and offline power conversion applications where avalanche robustness, fast switching, and surface-mount thermal efficiency are critical.

FAQ

What is the maximum continuous drain current for IRFR420TRL at 100 °C case temperature?

The IRFR420TRL supports 1.5 A continuous drain current at T_C = 100 °C, based on its linear derating factor of 0.33 W/°C from the 42 W maximum power dissipation at 25 °C. This value assumes proper PCB copper area for thermal conduction and accounts for junction temperature limits up to 150 °C. The IRFR420TRL must be mounted on ≥1" square FR-4 PCB or heatsink to achieve this rating.

Does IRFR420TRL have an integrated body diode, and what are its key parameters?

Yes, the IRFR420TRL includes an integral body diode with V_SD = 1.6 V at I_S = 2.4 A and T_J = 25 °C, t_rr = 260–520 ns at I_F = 2.1 A and dI/dt = 100 A/μs, and Q_rr = 0.70–1.4 μC. These values are measured under specified test conditions and define reverse recovery behavior in synchronous rectification or freewheeling applications. The IRFR420TRL body diode is not optimized for ultrafast recovery but provides adequate performance in medium-frequency hard-switched topologies.

Can IRFR420TRL be used in avalanche mode, and what are the safe operating limits?

Yes, the IRFR420TRL is repetitively avalanche rated with I_AR = 2.4 A and E_AR = 4.2 mJ under defined conditions (pulse width limited by T_Jmax = 150 °C). Single-pulse avalanche energy is rated at 400 mJ. Safe operation requires limiting pulse width and duty cycle per Figure 11 and 12 in the datasheet, and ensuring peak junction temperature remains within specification. The IRFR420TRL should not be operated continuously in avalanche without thermal validation.

What is the gate threshold voltage range for IRFR420TRL, and how does it affect drive requirements?

The IRFR420TRL has a gate-source threshold voltage V_GS(th) ranging from 2.0 V to 4.0 V at I_D = 250 μA. This means reliable enhancement begins above ~2.5 V, but full R_DS(on) specification (3.0 Ω) requires V_GS ≥ 10 V. Logic-level drive (e.g., 3.3 V or 5 V) will yield significantly higher on-resistance and is not recommended. The IRFR420TRL must be driven with ≥10 V gate voltage for optimal conduction performance.

Is IRFR420TRL pin-compatible with IRFU420, and what is the key mechanical difference?

No, IRFR420TRL is not pin-compatible with IRFU420. The IRFR420TRL uses DPAK (TO-252) surface-mount packaging with three gull-wing leads and an exposed drain pad, while IRFU420 uses IPAK (TO-251) through-hole packaging with straight leads and no thermal pad. Although both share identical electrical specifications, their footprints, soldering methods, and thermal paths differ fundamentally-requiring separate PCB layouts. Substituting one for the other without board revision is not feasible.

IRFR420TRL 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

IRFR420TRL FAQ

1.How can I place an order for IRFR420TRL through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFR420TRL 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 IRFR420TRL reliable?

The price and inventory of IRFR420TRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFR420TRL is usually 5 days.

3.What payment methods are accepted for IRFR420TRL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFR420TRL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFR420TRL?

IRFR420TRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFR420TRL 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 IRFR420TRL?

For technical support, including IRFR420TRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFR420TRL requirements.

6.How does Aetrix verify that IRFR420TRL is sourced from the original manufacturer or authorized distributors?

All IRFR420TRL 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 IRFR420TRL meets industry standards.

7.What is the process for return or replacement of IRFR420TRL?

All IRFR420TRL units undergo pre-shipment inspection (PSI). If there is an issue with IRFR420TRL, 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 IRFR420TRL part is unused and in its original packaging.

Return procedure for IRFR420TRL:

1.Submit a request within 90 days.

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

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