STMicroelectronics STFW12N120K5

Overview

STFW12N120K5 from STMicroelectronics is a high-voltage N-channel Power MOSFET based on MDmesh K5 technology, designed for hard-switching and resonant topologies in industrial power conversion. It delivers 1200 V V_DS, 620 mΩ typ. R_DS(on) at V_GS = 10 V, 44.2 nC total gate charge, and 3.5 kV RMS insulation rating in TO-3PF package-enabling compact, high-efficiency HV DC-DC converters and PFC stages.

For engineers reviewing the STFW12N120K5 datasheet, STFW12N120K5 pinout, STFW12N120K5 application, or STFW12N120K5 equivalent, key selection criteria include avalanche ruggedness (215 mJ E_AS), ultra-low Q_gd/Q_g ratio (30/44.2 nC), dv/dt immunity (50 V/ns), and Zener-protected gate-critical for reliable operation in unclamped inductive switching and high-noise HV environments.

Technical Context

This device employs ST's proprietary vertical MDmesh K5 structure to simultaneously reduce specific on-resistance and gate charge-achieving FoM (R_DS(on) × Q_g) of 27.5 Ω·nC. Its optimized cell layout supports fast, low-loss switching with minimal Miller effect, validated by 63 W power dissipation capability and 1.98 °C/W R_thJC in TO-3PF.

The integrated Zener-protected gate ensures ±30 V V_GS tolerance and robustness against transient overvoltage, while the source-drain diode features 1.5 V V_SD at 12 A and 630 ns trr at 25 °C-supporting synchronous rectification and bidirectional current handling in bridge configurations.

Key Specifications

Pinout & Package

STFW12N120K5 is housed in TO-3PF (Type A) metal-can package with insulated tab, offering superior thermal performance and high-voltage isolation versus TO-220FP. The package provides direct heatsink mounting via the drain-connected tab and meets ECOPACK environmental compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IXTH12N120 and STW12N120, STFW12N120K5 uniquely combines reinforced 3.5 kV isolation, Zener-protected gate, and industry-leading FoM-making it optimal for space-constrained, safety-certified HV SMPS where reliability under transient stress is non-negotiable.

Availability

STFW12N120K5 is available at Aetrix Electronics and suitable for industrial HV DC-DC converters, three-phase motor drives, and renewable energy inverters requiring stable component supply across multi-year production cycles.

Supply support for STFW12N120K5 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, specializing in power management, microcontrollers, sensors, and automotive ICs.

STFW12N120K5 belongs to the MDmesh K5 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 1000–1500 V industrial and energy infrastructure systems.

FAQ

What is the maximum continuous drain current at T_C = 100 °C?

The STFW12N120K5 supports 7.6 A continuous drain current at case temperature of 100 °C, as specified in Table 1 of DS10355 Rev 3. This rating accounts for thermal derating due to reduced channel mobility and increased R_DS(on) at elevated temperatures, ensuring safe operation within SOA limits.

Does STFW12N120K5 have an integrated body diode, and what are its key recovery characteristics?

Yes, it integrates a fast-recovery source-drain diode with 1.5 V forward voltage at 12 A, 630 ns reverse recovery time (trr), and 12.6 μC reverse recovery charge (Qrr) at 25 °C. These values are measured under standardized conditions (ISD = 12 A, di/dt = 100 A/μs, VDD = 60 V), confirming suitability for freewheeling in hard-switched topologies.

How does the TO-3PF package improve thermal performance over TO-220FP?

The TO-3PF package reduces junction-to-case thermal resistance from 3.1 °C/W (TO-220FP) to 1.98 °C/W, enabling 57% higher power dissipation (63 W vs. 40 W at T_C = 25 °C). Its larger metal tab area and optimized internal bond wire layout enhance heat transfer to external heatsinks-critical for high-power density designs.

Is STFW12N120K5 suitable for use in zero-voltage switching (ZVS) circuits?

Yes-its ultra-low Q_gd (30 nC), low C_oss (110 pF), and 128 pF Co(tr) enable efficient ZVS operation in LLC and phase-shifted full-bridge converters. The device's 50 V/ns dv/dt ruggedness ensures stable turn-off even during resonant voltage reversal, minimizing switching loss and EMI generation.