STMicroelectronics STF35N65M5

Overview

STF35N65M5 from STMicroelectronics is an N-channel 650 V, 85 mΩ typ. (98 mΩ max.), 27 A MDmesh M5 Power MOSFET in D²PAK package, optimized for high-efficiency hard-switching and ZVS resonant converters in industrial SMPS and solar inverters.

For engineers reviewing the STF35N65M5 datasheet, STF35N65M5 pinout, STF35N65M5 application, or STF35N65M5 equivalent, key selection criteria include R_DS(on) at 10 V, 15 V/ns dv/dt capability, 800 mJ single-pulse avalanche energy, and D²PAK thermal resistance of 0.78 °C/W junction-to-case.

Technical Context

This device employs ST's MDmesh M5 vertical superjunction process with PowerMESH horizontal layout to achieve ultra-low R_DS(on) while maintaining robust 650 V breakdown voltage and 15 V/ns diode recovery dv/dt rating. It integrates a fast-recovery body diode with 360 ns trr at 25 °C and 425 ns at 150 °C.

The MOSFET operates up to 150 °C junction temperature, supports 108 A pulsed drain current, and delivers 160 W total power dissipation at T_C = 25 °C. Its gate charge profile (Q_g = 83 nC, Q_gd = 35 nC) enables efficient high-frequency switching in 65–100 kHz PFC and DC-DC stages.

Key Specifications

Pinout & Package

D²PAK (TO-263) package: 3-pin surface-mount outline with exposed drain tab (pin 2), gate (pin 1), and source (pin 3); thermal pad soldered to PCB copper for low-junction-to-board resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STW35N65M5 and IPP65R099C7, STF35N65M5 delivers optimal balance of low R_DS(on), surface-mount compatibility, and avalanche ruggedness for space-constrained, convection-cooled industrial power supplies.

Availability

STF35N65M5 is available at Aetrix Electronics and suitable for industrial SMPS, solar inverters, and PFC boost converters requiring stable component supply across multi-year production cycles.

Supply support for STF35N65M5 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.

The MDmesh M5 product line targets high-efficiency AC-DC and DC-DC conversion in 650–800 V applications, emphasizing low R_DS(on), fast switching, and ruggedness in harsh electrical environments.

FAQ

What is the maximum gate-source voltage rating for STF35N65M5?

The absolute maximum V_GS is ±25 V, with recommended operating range of –10 V to +20 V. Exceeding ±25 V risks permanent gate oxide damage. Gate drive circuits must include clamping (e.g., Zener diodes) to prevent overshoot during fast switching transitions, especially in high-dv/dt bridge configurations.

Does STF35N65M5 require a negative gate voltage for reliable turn-off?

No - the device turns off fully at V_GS = 0 V due to its 3–5 V threshold voltage range. However, applying –5 V to –10 V improves noise immunity in high-noise industrial environments and reduces Miller-induced turn-on risk during high-speed switching in half-bridge topologies.

Can STF35N65M5 replace STB35N65M5 in existing designs?

Yes - STF35N65M5 and STB35N65M5 share identical electrical specifications, thermal performance, and D²PAK pinout. The STF prefix denotes tape-and-reel packaging for automated SMT assembly, while STB indicates tube packaging; both use the same die and qualification lot.

What is the safe operating area (SOA) limitation at 100 °C case temperature?

At T_C = 100 °C, the SOA is limited to 17 A continuous drain current and 400 V V_DS for DC operation. For pulse widths ≤100 µs, it supports up to 108 A at 400 V, bounded by the 150 °C junction temperature limit and R_DS(on) thermal runaway margin per Figure 1 in DS6068.