STMicroelectronics

BU941  

Single Bipolar Transistors

BU941 Description

The BU941 from STMicroelectronics is a high-power NPN Darlington transistor designed for demanding applications requiring robust performance. Encased in a TO-3 package, it features a 400V collector-emitter breakdown voltage (V_CEO) and a 15A maximum collector current (I_C), making it suitable for high-voltage, high-current switching and amplification. With a 180W power dissipation rating and an operating temperature range of up to 200°C (T_J), the BU941 excels in harsh environments. Its low collector cutoff current (100µA max) and high DC current gain (h_FE ≥ 300 @ 5A, 10V) ensure efficient operation with minimal leakage.

BU941 Features

• High Voltage & Current Handling: 400V V_CEO and 15A I_C for power applications.
• Low Saturation Voltage: 2V max @ 300mA, 12A, reducing power losses.
• High Gain Darlington Pair: h_FE ≥ 300 ensures strong signal amplification.
• Robust Thermal Performance: 180W power dissipation and 200°C T_J for reliability.
• Chassis Mount (TO-3): Ideal for heat dissipation in high-power systems.
• Compliance: ROHS3 Compliant, REACH Unaffected, and EAR99 ECCN for global use.

BU941 Applications

The BU941 is ideal for:

• Power Supplies: High-voltage switching in industrial SMPS.
• Motor Control: Driving high-current motors in automation and robotics.
• Audio Amplifiers: High-power output stages in professional audio systems.
• Industrial Equipment: Relays, solenoids, and inductive load switching.
• Automotive Systems: Ignition systems and high-power electronic controls.

Conclusion of BU941

The BU941 stands out as a high-reliability Darlington transistor for high-voltage, high-current applications. Its low saturation voltage, high gain, and robust thermal performance make it superior to standard bipolar transistors in demanding environments. While obsolete, its TO-3 chassis mount and STMicroelectronics' legacy quality ensure it remains a viable choice for legacy designs or replacements. Ideal for industrial, automotive, and audio applications, the BU941 delivers durable performance where efficiency and power handling are critical.

BU941 Documents

Download datasheets and manufacturer documentation for BU941

Datasheets :

BU941(P)      

HTML Datasheet :

BU941(P)