STMicroelectronics STF11N65M2

Overview

STF11N65M2 from STMicroelectronics is an N-channel 650 V, 0.68 Ω max R_DS(on), 7 A MDmesh M2 Power MOSFET in TO-220FP package, optimized for high-efficiency flyback and PFC converters with low gate charge (12.5 nC) and rugged 100% avalanche testing. It integrates a Zener-protected body diode and delivers 110 mJ single-pulse avalanche energy at 50 V.

For engineers reviewing the STF11N65M2 datasheet, STF11N65M2 pinout, STF11N65M2 application, or STF11N65M2 equivalent, key selection criteria include its 50 V/ns MOSFET dv/dt ruggedness, 43 pF C_oss,eq at 0–520 V, 5 °C/W junction-to-case thermal resistance, and suitability for industrial SMPS designs requiring reliable hard-switching performance under repetitive stress.

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 0.60 Ω typ. at V_GS = 10 V and 43 pF C_oss,eq. Its gate threshold voltage (2–4 V) ensures stable turn-on across –55 to 150 °C junction temperature range.

The integrated Zener-protected body diode supports bidirectional current flow with 1.6 V forward voltage at 7 A and 318 ns reverse recovery time (T_J = 25 °C), while the 2.5 kV RMS insulation withstand voltage enables safe mounting on electrically isolated heat sinks.

Key Specifications

Pinout & Package

TO-220FP package: insulated flange, vertical mounting, single-row 3-pin configuration with integral heatsink tab. Flange is electrically connected to drain (pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP12N65M2 and FDPF12N65, STF11N65M2 offers the best balance of low R_DS(on), certified avalanche robustness, and integrated Zener protection-making it optimal for cost-sensitive industrial SMPS where reliability under transient overload is non-negotiable.

Availability

STF11N65M2 is available at Aetrix Electronics and suitable for industrial flyback converters, active PFC pre-regulators, LED driver power stages, and UPS inverter half-bridge legs requiring stable component supply and long-term production continuity.

Supply support for STF11N65M2 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 automotive, industrial, and consumer markets.

This part belongs to ST's MDmesh™ M2 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switched-mode power supplies operating at 650 V class with demanding thermal and ruggedness requirements.

FAQ

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

The STF11N65M2 supports 4.4 A continuous drain current at T_C = 100 °C, as specified in Table 1 (ID(1)). This derating reflects thermal limitations of the TO-220FP package and ensures junction temperature remains within the 150 °C absolute maximum under sustained load conditions with adequate heatsinking.

Does this MOSFET require a gate resistor for stability?

Yes-a gate resistor between 4.7 Ω and 10 Ω is recommended to dampen oscillation caused by the 6.4 Ω intrinsic gate resistance interacting with PCB trace inductance and driver output impedance. The datasheet's switching time test circuit (Figure 13) uses RG = 4.7 Ω, confirming this value provides optimal trade-off between speed and ringing suppression.

Can STF11N65M2 replace STF10N65M2 in existing designs?

Yes, with verification: both share identical TO-220FP package, pinout, and MDmesh M2 technology, but STF11N65M2 has 15% lower R_DS(on) (0.68 Ω vs. 0.78 Ω max) and 12.5 nC vs. 11.5 nC Q_g. Gate drive timing and thermal margins should be rechecked, especially in high-frequency or high-temperature environments where lower conduction loss may shift thermal distribution.

Is the body diode suitable for synchronous rectification?

No-the body diode is not optimized for synchronous rectification. Its 318 ns reverse recovery time (T_J = 25 °C) and 2.5 µC Q_rr cause significant switching loss and voltage overshoot when used as a freewheeling path in high-frequency buck or LLC topologies. External Schottky or GaN FETs are required for true synchronous operation.