STMicroelectronics STF42N65M5

Overview

STF42N65M5 from STMicroelectronics is an N-channel 650 V, 70 mΩ typ. (79 mΩ max), 33 A MDmesh™ M5 Power MOSFET in TO-220FP package. It delivers ultra-low R_DS(on), low gate charge (98 nC), and robust 100% avalanche-rated operation-designed for high-efficiency hard-switched PFC and SMPS primary-side switching in industrial power supplies.

For engineers reviewing the STF42N65M5 datasheet, STF42N65M5 pinout, STF42N65M5 application, or STF42N65M5 equivalent, key selection criteria include its 650 V breakdown voltage, 15 V/ns dv/dt ruggedness, 132 A pulsed drain current, and thermal resistance of 3.1 °C/W (junction-to-case) - all critical for reliable high-voltage, high-frequency converter design.

Technical Context

This device employs ST's MDmesh M5 vertical superjunction process combined with PowerMESH horizontal layout, enabling exceptional conduction efficiency and fast switching dynamics. Its optimized cell structure reduces both R_DS(on) × Q_g and E_oss, supporting high-frequency operation up to 100 kHz in resonant and hard-switched topologies.

The integrated body diode exhibits low reverse recovery charge (7–10 µC) and controlled trr (400–532 ns), minimizing commutation losses in bridge configurations. Gate threshold voltage is tightly specified (3–5 V), ensuring stable turn-on across temperature and compatibility with standard 10 V gate drivers.

Key Specifications

Pinout & Package

STF42N65M5 uses the TO-220FP (Full-Pak) package: insulated plastic case with integral heatsink tab, no metal mounting hole, intended for PCB-mounted heat dissipation via tab soldering. Pin 1 = Gate, Pin 2 = Drain (Tab), Pin 3 = Source.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power switching applications.

Compared with STP42N65M5, STF42N65M5 trades 2.45× higher R_thJC for built-in electrical isolation and simplified assembly; versus IPP65R190C7, it delivers 2.6× lower R_DS(on) and 1.5× higher current rating-making it superior for high-power, medium-frequency industrial SMPS where conduction loss dominates.

Availability

STF42N65M5 is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, server/telecom rectifiers, solar DC-DC converters, and EV on-board chargers requiring stable component supply and long-lifecycle support.

Supply support for STF42N65M5 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The MDmesh M5 product line targets high-efficiency, high-voltage power conversion-specifically engineered to replace older superjunction MOSFETs in 600–650 V applications demanding lowest R_DS(on) × Q_g and rugged avalanche behavior.

FAQ

What is the maximum recommended gate drive voltage for STF42N65M5?

The absolute maximum gate-source voltage is ±25 V, but ST recommends operating within 10–15 V for reliable turn-on and minimal gate oxide stress. Driving above 15 V yields diminishing R_DS(on) improvement while increasing risk of gate overvoltage during transients or layout-induced ringing.

Can STF42N65M5 replace STP42N65M5 in an existing TO-220 footprint?

No-STF42N65M5 uses TO-220FP (full-pack) with insulated tab and different pin spacing; STP42N65M5 uses standard TO-220 with exposed metal tab. Mechanical fit is incompatible, and thermal interface requirements differ significantly due to the integrated insulation layer.

Does STF42N65M5 require a negative gate voltage for improved dv/dt immunity?

No-its 15 V/ns dv/dt rating is achieved with 0 V turn-off. However, applying –5 V during off-state improves noise margin in high-noise environments (e.g., motor drives). The gate can safely withstand –25 V, but negative bias adds driver complexity without being mandatory for most SMPS applications.

Is the body diode suitable for synchronous rectification in LLC resonant converters?

Yes-the body diode has characterized reverse recovery (Q_rr = 7–10 µC, t_rr = 400–532 ns) and low forward voltage (V_SD = 1.5 V @ 33 A), making it viable for freewheeling in asymmetrical half-bridge LLC. However, for highest efficiency, an external SiC Schottky diode is still preferred in critical high-frequency designs.