STMicroelectronics STFW4N150

Overview

STFW4N150 from STMicroelectronics is an N-channel 1500 V, 6 Ω typ., 4 A PowerMESH™ high-voltage power MOSFET in a fully isolated TO-3PF plastic package, designed for high-reliability switching applications requiring 3.5 kV RMS insulation and robust unclamped inductive avalanche capability (EAS = 350 mJ). It delivers high-speed switching with low gate charge (Qg = 29 nC typ.) and minimized intrinsic capacitances.

For engineers reviewing the STFW4N150 datasheet, STFW4N150 pinout, STFW4N150 application, or STFW4N150 equivalent, key selection considerations include its 1500 V V_DS, 3.5 kV isolation rating, TO-3PF thermal resistance (R_thJC = 2 °C/W), avalanche ruggedness, and suitability for high-voltage DC-DC converters and industrial motor drives.

Technical Context

This device employs ST's proprietary MESH OVERLAY strip-layout process to achieve superior R_DS(on)-to-voltage rating trade-off and enhanced safe operating area (SOA) at high voltage. Its fully isolated TO-3PF package enables direct mounting to a heatsink without additional insulation, supporting high-voltage system integration.

The MOSFET features a fast, soft-recovery body diode (t_rr = 520 ns, Q_rr = 3.1 µC) and optimized dynamic parameters-C_iss = 1100 pF, C_oss = 120 pF, C_rss = 12 pF-enabling efficient hard-switching operation up to several hundred kHz in resonant and quasi-resonant topologies.

Key Specifications

Pinout & Package

The STFW4N150 is housed in a fully isolated TO-3PF plastic package with three terminals: Drain (Tab), Gate (Pin 1), and Source (Pin 3). The metal tab is electrically connected to the Drain and thermally coupled to the die; it serves as both high-current output and primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STW4N150 and STP4N150, the STFW4N150 trades higher thermal resistance (2 °C/W) for built-in 3.5 kV isolation-making it uniquely suited for space-constrained, safety-critical HV systems where insulating hardware adds cost and complexity.

Availability

STFW4N150 is available at Aetrix Electronics and suitable for industrial motor drives, high-voltage DC-DC converters, laser driver circuits, and capacitor discharge units requiring stable component supply and long-term lifecycle assurance.

Supply support for STFW4N150 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, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The STFW4N150 belongs to ST's PowerMESH™ HV MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 600–1500 V industrial power systems where avalanche ruggedness and package-level isolation are mandatory.

FAQ

What is the maximum continuous drain current for STFW4N150 at 100 °C case temperature?

The STFW4N150 supports 2.5 A continuous drain current (I_D) at T_C = 100 °C, as specified in Table 1 of DS4257 Rev 10. This derating reflects thermal limits of the TO-3PF package and ensures junction temperature remains within the 150 °C maximum operating range under sustained load.

Does STFW4N150 require a gate resistor for safe operation?

Yes-a gate resistor (typically 4.7 Ω, per Figure 17 test circuit) is required to control dV/dt and prevent parasitic oscillation during switching. The datasheet specifies switching times (e.g., t_d(on) = 34 ns) using R_G = 4.7 Ω, and omitting it risks shoot-through, excessive EMI, or gate oxide stress.

Can STFW4N150 be used in place of STW4N150 without redesigning the PCB?

No-STFW4N150 uses TO-3PF (3-pin, isolated tab), while STW4N150 uses TO-247 (3-pin, non-isolated tab). Their footprints, thermal mounting requirements, and isolation schemes differ fundamentally; mechanical and safety requalification would be required.

What is the significance of the "100% avalanche tested" feature?

Every STFW4N150 unit undergoes production-level unclamped inductive switching (UIS) testing at I_AR = 4 A and V_DD = 50 V to verify EAS ≥350 mJ. This guarantees robustness against voltage spikes caused by transformer leakage inductance or cable inductance in real-world power circuits.