STMicroelectronics BUTW92

Overview

BUTW92 from STMicroelectronics is a high-current, high-speed NPN silicon power transistor designed for switching in motor control and high-efficiency DC-DC converters. It supports 60 A continuous emitter current, 500 V collector-emitter breakdown (V_CES), 180 W total dissipation at T_c ≤ 25 °C, and exhibits 0.8 V typical V_CE(sat) at I_C = 60 A / I_B = 15 A, enabling low conduction loss in hard-switched industrial inverters.

For engineers reviewing the BUTW92 datasheet, BUTW92 pinout, BUTW92 application, or BUTW92 equivalent, key selection criteria include its 250 V V_CEO rating, 1.2 µs storage time under resistive load, 0.7 °C/W junction-to-case thermal resistance, and TO-247 package compatibility with forced-air heatsinking in 3–10 kW motor drives and offline SMPS.

Technical Context

This NPN bipolar junction transistor operates in linear or saturated switching mode with base-controlled current amplification. Its rugged construction supports repetitive peak emitter current of 70 A (t_p < 5 ms) and sustained 60 A DC operation at case temperatures up to 100 °C.

The device features fast switching characteristics-1.2–1.4 µs storage time and 250–300 ns fall time under standardized resistive-load conditions (I_C = 50 A, V_CC = 250 V, I_B1 = –I_B2 = 10 A)-making it suitable for hard-switched topologies below 100 kHz where BJT gate drive simplicity and SOA robustness are prioritized over MOSFET-level speed.

Key Specifications

Pinout & Package

Package: TO-247 (3-pin, straight lead, isolated tab). Mounting surface is electrically connected to collector (Pin 2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current NPN transistor applications.

Compared with BUW92 and BDW93C, BUTW92 delivers superior voltage margin (500 V), lower saturation voltage (0.8 V), and higher thermal performance (0.7 °C/W), making it optimal for new 400 V+ bus designs demanding reliability and efficiency at 60 A.

Availability

BUTW92 is available at Aetrix Electronics and suitable for industrial motor drives, offline switch-mode power supplies, uninterruptible power systems, and DC motor controllers requiring stable component supply across multi-year production cycles.

Supply support for BUTW92 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 discrete devices, microcontrollers, sensors, and automotive ICs.

The BUTW92 belongs to ST's high-voltage, high-current bipolar transistor product line, engineered specifically for ruggedized switching in industrial power conversion and motor control systems operating up to 150 °C junction temperature.

FAQ

What is the maximum safe operating case temperature for BUTW92 at 60 A continuous current?

The BUTW92 is rated for 100 °C case temperature at 60 A continuous emitter current per electrical characteristics table. Exceeding this requires derating per the thermal resistance curve; junction temperature must remain ≤150 °C, enforced via heatsink design with ≤0.7 °C/W total thermal resistance from junction to ambient.

Does BUTW92 require a negative base turn-off voltage?

No. BUTW92 does not specify or require negative base voltage for turn-off. Its storage time (1.2 µs) and fall time (250 ns) are characterized with I_B1 = –I_B2 = 10 A in test conditions, but standard zero-voltage base turn-off is functional-negative bias may improve switching speed but is not mandatory.

Can BUTW92 replace MOSFETs in high-frequency resonant converters?

No. With 1.2 µs storage time and 250 ns fall time, BUTW92 is optimized for hard-switched topologies ≤100 kHz. Its minority-carrier nature causes excessive switching loss above 50 kHz; MOSFETs or SiC devices are preferred for resonant LLC or ZVS converters operating >200 kHz.

Is the collector tab of BUTW92 electrically isolated in the TO-247 package?

No. In the BUTW92 TO-247 package, the collector (Pin 2) is internally bonded to the metal tab. The tab must be electrically connected to the collector node and thermally mounted to the heatsink-no isolation pad is required or recommended unless system-level galvanic isolation dictates external insulation.