STMicroelectronics STU11N65M2

Overview

STU11N65M2 from STMicroelectronics is an N-channel 650 V, 0.60 Ω typ. (0.68 Ω max.), 7 A MDmesh™ M2 Power MOSFET in IPAK (TO-251) package, optimized for high-efficiency flyback and PFC converters in industrial SMPS and AC-DC adapters.

For engineers reviewing the STU11N65M2 datasheet, STU11N65M2 pinout, STU11N65M2 application, or STU11N65M2 equivalent, key selection criteria include its 12.5 nC total gate charge, 43 pF equivalent output capacitance (Coss eq.) at 0–520 V, 100% avalanche-tested ruggedness, and Zener-protected gate structure - all critical for reliable high-voltage switching in compact power supplies.

Technical Context

This device employs ST's MDmesh™ M2 strip layout and enhanced vertical structure to simultaneously reduce R_DS(on) and optimize dynamic performance. Its low C_oss profile and 50 V/ns MOSFET dv/dt ruggedness enable stable operation under fast transient conditions without external snubbing.

The integrated source-drain diode features 318 ns reverse recovery time (T_j = 25 °C) and 2.5 µC Q_rr, supporting quasi-resonant and soft-switching topologies. Gate threshold voltage is tightly specified at 2–4 V (typ. 3 V), ensuring robust turn-on margin with standard 10 V gate drivers.

Key Specifications

Pinout & Package

IPAK (TO-251) package: three-terminal surface-mount variant of TO-220 with isolated tab (drain-connected), enabling PCB-mounted thermal management without insulating hardware.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP11N65M2, STU11N65M2 offers identical electrical performance in a smaller, surface-mount IPAK package ideal for automated production; versus IPP65R099C7, it delivers superior cost-per-watt in mid-power (<400 W), 65–100 kHz applications without demanding ultra-low R_DS(on).

Availability

STU11N65M2 is available at Aetrix Electronics and suitable for industrial AC-DC adapters, telecom rectifier modules, and EV charger auxiliary power supplies requiring stable component supply and long-term manufacturing continuity.

Supply support for STU11N65M2 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STU11N65M2 belongs to the MDmesh™ M2 high-voltage power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion in space-constrained industrial and computing power supplies.

FAQ

What is the maximum continuous drain current for STU11N65M2 at 100 °C case temperature?

The maximum continuous drain current is 4.4 A at T_case = 100 °C, as defined by thermal limits and R_DS(on) derating. This value ensures junction temperature remains ≤150 °C with 1.47 °C/W thermal resistance and appropriate PCB copper area. It is not a safe operating area (SOA) limit but a steady-state thermal boundary.

Does STU11N65M2 require a gate resistor for reliable operation?

Yes - a gate resistor (typically 4.7 Ω) is required to control dV/dt and prevent parasitic oscillation during switching. The datasheet specifies switching times (e.g., t_d(off) = 26 ns) using RG = 4.7 Ω; omitting it risks shoot-through, EMI, and gate driver overstress due to the device's 6.4 Ω intrinsic gate resistance and 12.5 nC Q_g.

Can STU11N65M2 replace STP11N65M2 in an existing TO-220 design?

No direct drop-in replacement: STU11N65M2 uses IPAK (TO-251) with gull-wing leads and drain-tab-down orientation, while STP11N65M2 uses TO-220 with through-hole leads and drain-tab-up. PCB layout, thermal pad design, and assembly process must be revised; however, electrical behavior and SOA curves are identical per DS10348 Rev 6.

Is the source-drain diode suitable for synchronous rectification?

No - the body diode has 318 ns reverse recovery time and 2.5 µC Q_rr, making it unsuitable for synchronous rectification above ~50 kHz. It is designed for freewheeling and clamping in hard-switched topologies; external Schottky or GaN FETs are required for high-frequency SR implementation.