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

Vishay Siliconix IRFD420PBF

Name: IRFD420PBF
Brand: Vishay Siliconix
SKU: IRFD420PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFD420PBF

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: 4-DIP (0.300", 7.62mm)

Datasheet:: IRFD420PBF.pdf

Description:: MOSFET N-CH 500V 370MA 4DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRFD420PBF from Vishay Siliconix is a 500 V, 0.37 A N-channel power MOSFET in HVMDIP (4-pin DIP) package, featuring 3.0 Ω R_DS(on) at V_GS = 10 V, 24 nC total gate charge, and repetitive avalanche rating. It serves as a low-cost, machine-insertable high-voltage switch in offline AC-DC auxiliary supplies and relay drivers.

For engineers reviewing the IRFD420PBF datasheet, IRFD420PBF pinout, IRFD420PBF application, or IRFD420PBF equivalent, key selection criteria include its 500 V blocking capability, 1 W ambient-rated power dissipation, dual-drain thermal path, and suitability for low-duty-cycle inductive switching with dV/dt immunity up to 3.5 V/ns.

Technical Context

This device belongs to Vishay's third-generation high-voltage power MOSFET family optimized for ruggedness and ease of use in low-power, high-voltage switching. Its structure includes an integral body diode with 260–520 ns reverse recovery time and supports unclamped inductive switching with 51 mJ single-pulse avalanche energy.

The HVMDIP package enables end-stacking and automatic insertion on 0.1" pitch PCBs; dual drain leads serve as thermal conduction paths to the heatsink or PCB copper, enabling 1 W power handling at T_A = 25 °C without forced airflow.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - supports direct connection to 380 V DC bus or 277 V AC line after rectification
R_DS(on)	3.0 Ω @ V_GS = 10 V - limits conduction loss to ≤0.41 W at 0.37 A continuous current
Q_g	24 nC - determines gate drive power requirement and switching speed with typical 18 Ω resistor
E_AS	51 mJ - enables safe operation during inductive turn-off transients without external snubber
T_J Range	−55 °C to +150 °C - qualified for industrial and extended-temperature embedded control environments
dV/dt Rating	3.5 V/ns - resists false turn-on in high-noise, fast-rising voltage applications like flyback snubbers
P_D	1.0 W @ T_A = 25 °C - defines maximum ambient-operated power without heatsink or airflow

Pinout & Package

HVMDIP (High-Voltage Mini-DIP) package: 4-pin through-hole, 0.1" pin spacing, dual drain leads (D1/D2), single gate (G), single source (S). Molded plastic body with exposed drain pads for thermal conduction to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
D1, D2	Drain (dual parallel terminals)	Shared high-side switch node; both pins electrically identical and thermally coupled to case for enhanced heat spreading
G	Gate	Control terminal requiring ≤±20 V drive; 3.3 nC gate-source charge enables logic-level compatible driving with 10 V supply
S	Source	Reference node for gate drive and load return; connects to ground or low-side return path in high-side configuration

Key Features

Feature	Design Value
Repetitive avalanche rated	Enables reliable operation under repeated inductive switching stress without derating or external protection
Dynamic dV/dt rating	3.5 V/ns immunity prevents spurious turn-on in noisy high-voltage transient environments
End stackable DIP	Allows vertical stacking of multiple IRFD420PBF units on same PCB footprint for space-constrained designs
Low Q_gd/Q_g ratio	13/24 = 54% - improves hard-switching efficiency and reduces Miller-induced oscillation risk
Simple drive requirements	Threshold voltage 2.0–4.0 V and 24 nC Q_g allow direct microcontroller GPIO or small buffer IC drive

Applications

AC-DC Auxiliary Power Supply	Industrial Relay Driver
Use Scenario: Providing bias power to PWM controllers and optocouplers in offline flyback converters operating from 85–265 V AC input. IC Role / Device Role / Timing Role: High-side switch controlling primary-side current in discontinuous conduction mode (DCM) with <100 kHz switching. Use Value: 500 V V_DS and 51 mJ E_AS eliminate need for clamping circuits during transformer reset.	Use Scenario: Driving 24 V DC or 120 V AC electromagnetic relays in PLC I/O modules and building automation panels. IC Role / Device Role / Timing Role: Low-duty-cycle, high-voltage load switch activated by microcontroller GPIO with <10 ms on-time. Use Value: Repetitive avalanche rating ensures reliability across thousands of relay coil de-energization events without degradation.
LED Signage Power Sequencer	Isolated Gate Driver Bias Supply
Use Scenario: Controlling power-up sequencing of multiple LED string drivers in outdoor signage using isolated DC-DC stages. IC Role / Device Role / Timing Role: Standby-mode switch enabling/disabling auxiliary rails prior to main converter start-up. Use Value: 1.0 W ambient-rated dissipation supports always-on control logic without heatsink in sealed enclosures.	Use Scenario: Generating isolated floating bias voltage for high-side IGBT or SiC gate drivers in motor inverters. IC Role / Device Role / Timing Role: Primary-side switch in miniature isolated flyback or ZVS resonant converter (<5 W output). Use Value: Dual drain leads provide low-inductance thermal path to PCB ground plane, improving thermal stability under intermittent load.

AC-DC Auxiliary Power Supply

Industrial Relay Driver

Use Scenario: Providing bias power to PWM controllers and optocouplers in offline flyback converters operating from 85–265 V AC input.

IC Role / Device Role / Timing Role: High-side switch controlling primary-side current in discontinuous conduction mode (DCM) with <100 kHz switching.

Use Value: 500 V V_DS and 51 mJ E_AS eliminate need for clamping circuits during transformer reset.

Use Scenario: Driving 24 V DC or 120 V AC electromagnetic relays in PLC I/O modules and building automation panels.

IC Role / Device Role / Timing Role: Low-duty-cycle, high-voltage load switch activated by microcontroller GPIO with <10 ms on-time.

Use Value: Repetitive avalanche rating ensures reliability across thousands of relay coil de-energization events without degradation.

LED Signage Power Sequencer

Isolated Gate Driver Bias Supply

Use Scenario: Controlling power-up sequencing of multiple LED string drivers in outdoor signage using isolated DC-DC stages.

IC Role / Device Role / Timing Role: Standby-mode switch enabling/disabling auxiliary rails prior to main converter start-up.

Use Value: 1.0 W ambient-rated dissipation supports always-on control logic without heatsink in sealed enclosures.

Use Scenario: Generating isolated floating bias voltage for high-side IGBT or SiC gate drivers in motor inverters.

IC Role / Device Role / Timing Role: Primary-side switch in miniature isolated flyback or ZVS resonant converter (<5 W output).

Use Value: Dual drain leads provide low-inductance thermal path to PCB ground plane, improving thermal stability under intermittent load.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, low-current MOSFET switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP1NK60ZFP	600 V V_DS, 0.32 A I_D, 13.5 Ω R_DS(on), TO-92 package	Higher R_DS(on) increases conduction loss; TO-92 limits thermal performance vs. HVMDIP	Prefer IRFD420PBF where board space allows DIP and thermal management requires >0.5 W dissipation
IXTP01N50D	500 V V_DS, 0.1 A I_D, 50 Ω R_DS(on), TO-220FP package	Lower current rating and higher on-resistance; TO-220FP requires heatsink for >0.2 W	Prefer IRFD420PBF for automated assembly, lower gate charge, and better dV/dt immunity in noise-sensitive layouts

Compared with STP1NK60ZFP and IXTP01N50D, the IRFD420PBF delivers superior thermal performance in compact through-hole form, lower switching losses via reduced Q_g, and proven robustness in repetitive avalanche conditions critical for relay and solenoid drive.

Availability

IRFD420PBF is available at Aetrix Electronics and suitable for AC-DC auxiliary supplies, industrial relay drivers, LED signage sequencers, and isolated gate driver bias supplies requiring stable component supply and long-term manufacturability.

Supply support for IRFD420PBF 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 application-specific optimization.

The IRFD series targets cost-sensitive, high-voltage, low-power switching applications where automated assembly, thermal simplicity, and transient robustness are prioritized over ultra-low R_DS(on).

FAQ

What is the maximum continuous drain current for IRFD420PBF at 100 °C ambient temperature?

The IRFD420PBF supports 0.23 A continuous drain current at T_A = 100 °C, per its absolute maximum ratings table. This derating reflects thermal limits of the HVMDIP package with no heatsink. At 25 °C ambient, it handles 0.37 A continuously. Designers must verify junction temperature rise using R_thJA = 120 °C/W and actual board layout thermal resistance to ensure T_J stays below 150 °C.

Does IRFD420PBF have a built-in body diode, and what are its key parameters?

Yes, the IRFD420PBF integrates a body diode with 0.37 A continuous forward current rating, 5.0 A pulsed capability, 1.6 V forward voltage at 0.37 A, and 260–520 ns reverse recovery time. These values are measured at T_J = 25 °C with I_F = 2.1 A and dI/dt = 100 A/μs. The diode enables freewheeling in inductive loads but is not optimized for high-frequency synchronous rectification.

Can IRFD420PBF be used in place of a logic-level MOSFET driven directly by a 3.3 V microcontroller?

No - the IRFD420PBF has a gate threshold voltage range of 2.0–4.0 V and requires ≥10 V V_GS to achieve its specified 3.0 Ω R_DS(on). At 3.3 V, R_DS(on) exceeds 10 Ω and drain current capability drops significantly. For 3.3 V logic drive, a true logic-level MOSFET such as the IRLML6344 should be selected instead of the IRFD420PBF.

What does "repetitive avalanche rated" mean for IRFD420PBF, and how is it tested?

"Repetitive avalanche rated" means the IRFD420PBF is characterized and guaranteed to withstand repeated unclamped inductive switching events without parameter shift or failure. Per datasheet note b, testing uses V_DD = 50 V, L = 40 mH, R_g = 25 Ω, and I_AS = 1.5 A, with pulse width limited by junction temperature. This rating validates use in relay/snubberless flyback designs where energy recovery occurs cyclically.

Is IRFD420PBF RoHS-compliant and lead-free?

Yes - the "PbF" suffix in IRFD420PBF explicitly denotes lead-free and RoHS-compliant construction per Vishay's material categorization standard (see doc?99912). The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for through-hole reflow and wave soldering, with peak temperature tolerance up to 300 °C for 10 seconds.

IRFD420PBF Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: 4-DIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 500 V

Current - Continuous Drain (Id) @ 25°C:: 370mA (Ta)

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

Rds On (Max) @ Id, Vgs:: 3Ohm @ 220mA, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 24 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 360 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 1W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 4-HVMDIP

IRFD420PBF FAQ

1.How can I place an order for IRFD420PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFD420PBF 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 IRFD420PBF reliable?

The price and inventory of IRFD420PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFD420PBF is usually 5 days.

3.What payment methods are accepted for IRFD420PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFD420PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFD420PBF?

IRFD420PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFD420PBF 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 IRFD420PBF?

For technical support, including IRFD420PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFD420PBF requirements.

6.How does Aetrix verify that IRFD420PBF is sourced from the original manufacturer or authorized distributors?

All IRFD420PBF 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 IRFD420PBF meets industry standards.

7.What is the process for return or replacement of IRFD420PBF?

All IRFD420PBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFD420PBF, 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 IRFD420PBF part is unused and in its original packaging.

Return procedure for IRFD420PBF:

1.Submit a request within 90 days.

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

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