STMicroelectronics STF40N65M2

Overview

STF40N65M2 from STMicroelectronics is an N-channel 650 V, 32 A MDmesh M2 Power MOSFET in TO-220FP package, featuring 87 mΩ typical R_DS(on), 56.5 nC total gate charge, and 100% avalanche tested. It delivers low turn-off switching losses and excellent C_OSS profile for high-efficiency 650 V hard-switched PFC and LLC resonant converters.

For engineers reviewing the STF40N65M2 datasheet, STF40N65M2 pinout, STF40N65M2 application, or STF40N65M2 equivalent, key selection criteria include its 2.5 kV insulation withstand voltage, 15 V/ns diode recovery dv/dt ruggedness, Zener-protected gate, and optimized COSS for soft-switching performance in industrial SMPS designs.

Technical Context

This device employs ST's MDmesh M2 strip layout and enhanced vertical structure to simultaneously reduce R_DS(on) and output capacitance-achieving 380 pF C_OSS(eq) at 520 V while maintaining 650 V V_DS rating. Its 4.5 Ω intrinsic gate resistance and 24 nC Q_gd support fast, controllable switching with minimized Miller-induced shoot-through risk.

The integrated source-drain diode exhibits 468 ns t_rr and 8.7 µC Q_rr at 25 °C (150 °C: 610 ns / 11.7 µC), enabling reliable operation in discontinuous conduction mode (DCM) flyback and active clamp forward topologies without external snubbing.

Key Specifications

Pinout & Package

TO-220FP (Type B) package: isolated plastic body with internal thermal pad; leads are tin-plated copper; creepage/clearance compliant per IEC 60664-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IXTH30N65X2 and IPP65R095C7, STF40N65M2 uniquely combines 2.5 kV isolation, Zener gate protection, and MDmesh M2's low C_OSS(eq), making it optimal for safety-certified, high-reliability 650 V SMPS where board-level insulation and avalanche robustness are mandatory.

Availability

STF40N65M2 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server rectifiers, and EV onboard chargers requiring stable component supply and long-term lifecycle support.

Supply support for STF40N65M2 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

STF40N65M2 belongs to the MDmesh M2 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-power-density offline SMPS and industrial motor drives demanding low R_DS(on), low switching loss, and rugged reliability.

FAQ

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

The STF40N65M2 supports 20 A continuous drain current when the case temperature is maintained at 100 °C, as specified in Table 1 of DS10857. This derating reflects thermal limits of the TO-220FP package and ensures safe operation within the SOA boundary at elevated temperatures.

Does STF40N65M2 have integrated gate protection?

Yes-STF40N65M2 integrates a Zener diode between gate and source, clamping transient gate voltages to ±25 V. This eliminates the need for external gate protection components in most applications, simplifying layout and improving system robustness against ESD and Miller-induced spikes.

Can STF40N65M2 be used in zero-voltage switching (ZVS) topologies?

Yes-the device's 380 pF C_OSS(eq) at 520 V and low 24 nC Q_gd enable predictable resonant turn-on behavior. Measured E_OSS is 8 µJ at 200 V, supporting efficient ZVS in LLC and phase-shifted full-bridge converters operating up to 300 kHz.

What is the safe operating area (SOA) limitation at 10 µs pulse width?

At 10 µs pulse width, the SOA is limited by peak current and voltage constraints: maximum 128 A pulsed drain current at V_DS ≤ 100 V, or 32 A at V_DS ≤ 650 V. The device remains within SOA boundaries under unclamped inductive switching up to 820 mJ single-pulse avalanche energy.