Vishay Siliconix IRFP344PBF

Overview

IRFP344PBF from Vishay Siliconix is a 450 V, 9.5 A N-channel power MOSFET in TO-247 package, optimized for high-voltage switching in industrial SMPS, motor drives, and DC-DC converters. It features 0.63 Ω R_DS(on) at V_GS = 10 V, 80 nC total gate charge, and repetitive avalanche rating up to 9.5 A - enabling robust unclamped inductive switching in flyback and forward topologies.

For engineers reviewing the IRFP344PBF datasheet, IRFP344PBF pinout, IRFP344PBF application, or IRFP344PBF equivalent, key selection criteria include its 450 V V_DS, isolated mounting hole for enhanced creepage, 3.5 V/ns peak diode recovery dV/dt capability, and thermal resistance of 0.83 °C/W (junction-to-case), critical for thermally constrained high-power designs.

Technical Context

This third-generation Power MOSFET uses planar V-groove silicon technology to achieve low on-resistance while maintaining ruggedness against repetitive avalanche stress. Its gate threshold voltage (2.0–4.0 V) and 12 nC gate-source charge support simple drive with standard 10 V logic-level gate drivers.

The device integrates a fast-recovery body diode (t_rr = 490–740 ns, Q_rr = 3.2–4.8 µC) and exhibits controlled dV/dt immunity (3.5 V/ns), making it suitable for hard-switched topologies where diode reverse recovery and voltage transients demand precise timing control.

Key Specifications

Pinout & Package

IRFP344PBF is housed in a TO-247 package with isolated central mounting hole, providing enhanced creepage distance and mechanical stability for high-voltage industrial mounting. The package has three leads: Gate (G), Drain (D), Source (S), with Drain electrically connected to the metal tab.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage N-channel MOSFET applications.

Compared with STP3NK60ZFP and IXTH12N50L, the IRFP344PBF uniquely combines 450 V rating, 9.5 A current, repetitive avalanche capability, and isolated TO-247 mounting - making it optimal for ruggedized industrial SMPS where reliability under transient stress is mandatory.

Availability

IRFP344PBF is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, motor drive inverters, and DC-DC boost converters requiring stable component supply and long-term manufacturing continuity.

Supply support for IRFP344PBF 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 IRFP344PBF belongs to Vishay's third-generation high-voltage Power MOSFET product line, engineered specifically for demanding industrial power conversion applications requiring avalanche robustness and thermal stability.

FAQ

What is the maximum continuous drain current for IRFP344PBF at 100 °C case temperature?

The IRFP344PBF supports 6.0 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations of the TO-247 package and must be applied when heatsink temperature exceeds 25 °C. Designers should verify junction temperature using R_thJC = 0.83 °C/W and ambient conditions to ensure safe operation within the -55 to +150 °C range. The IRFP344PBF maintains full functionality across this derated current range.

Does IRFP344PBF have a qualified repetitive avalanche rating, and what are its limits?

Yes, the IRFP344PBF is explicitly rated for repetitive avalanche operation: I_AR = 9.5 A and E_AR = 15 mJ, per the Absolute Maximum Ratings table. These values apply under pulsed conditions with pulse width limited by junction temperature (see Figure 11). Unlike single-pulse E_AS = 410 mJ, the repetitive rating ensures sustained reliability in applications like motor freewheeling or inductive load switching where repeated energy absorption occurs. The IRFP344PBF datasheet confirms this qualification under Note "a".

What is the gate threshold voltage range for IRFP344PBF, and how does it affect drive design?

The IRFP344PBF has a gate threshold voltage V_GS(th) ranging from 2.0 V to 4.0 V at I_D = 250 µA, ensuring turn-on begins reliably with standard 5 V or 10 V logic-level drivers. This range avoids unintended conduction near 0 V while allowing full enhancement at 10 V, where R_DS(on) reaches its specified 0.63 Ω. Designers must ensure gate drive stays within ±20 V absolute maximum to prevent damage. The IRFP344PBF's 12 nC Q_gs further simplifies drive circuit sizing.

How does the isolated mounting hole in the TO-247 package of IRFP344PBF improve safety compliance?

The isolated central mounting hole in the IRFP344PBF's TO-247 package increases creepage distance between the drain-connected metal tab and lead terminals, helping meet IEC 60950 and UL 60950 insulation requirements for industrial equipment. Unlike TO-218, this isolation prevents conductive paths through screws or washers, reducing risk of electrical breakdown under humidity or contamination. The IRFP344PBF's design achieves >8 mm creepage - a key factor in certified power supply approvals where reinforced insulation is mandated.

What are the body diode characteristics of IRFP344PBF, and why do they matter in bridge configurations?

The IRFP344PBF features a built-in body diode with V_SD = 2.0 V at I_S = 9.5 A and t_rr = 490–740 ns at I_F = 8.8 A. These parameters directly impact dead-time selection and shoot-through risk in half-bridge or full-bridge topologies. Fast recovery minimizes reverse recovery losses, while consistent Q_rr = 3.2–4.8 µC enables predictable timing. Because the IRFP344PBF's diode is integral to the MOSFET structure, its behavior is tightly coupled to channel operation - critical for synchronous rectification and regenerative braking circuits.