STMicroelectronics

BU941ZP

BU941ZP Description

The BU941ZP from STMicroelectronics is a high-power NPN Darlington transistor designed for demanding applications requiring robust performance under extreme conditions. With a collector-emitter breakdown voltage (Vce) of 350V and a maximum collector current (Ic) of 15A, this device is engineered to handle high-voltage, high-current loads efficiently. Its 175°C maximum junction temperature (TJ) ensures reliable operation in thermally challenging environments. Packaged in a TO-247-3 through-hole format, the BU941ZP is optimized for heat dissipation, supporting a maximum power dissipation of 155W.

BU941ZP Features

• High Voltage & Current Handling: 350V Vce and 15A Ic make it suitable for power-switching applications.
• Low Saturation Voltage: 2V @ 300mA, 12A minimizes power loss in switching operations.
• High DC Current Gain (hFE): 300 @ 5A, 10V ensures efficient signal amplification.
• Thermal Resilience: Operates up to 175°C (TJ) with excellent thermal stability.
• Compliance & Reliability: ROHS3 compliant, REACH unaffected, and MSL 1 (unlimited) for long-term reliability.
• Darlington Configuration: Enhanced current gain and simplified drive requirements compared to standard bipolar transistors.

BU941ZP Applications

• Power Supplies: Ideal for high-voltage switch-mode power supplies (SMPS) and inverters.
• Motor Control: Suitable for driving high-current motors in industrial and automotive systems.
• Electronic Load Switching: Used in relays, solenoids, and inductive load drivers.
• Audio Amplifiers: High gain and low distortion make it viable for high-power audio stages.
• Obsolete but Reliable: While marked obsolete, it remains a robust choice for legacy designs requiring high-voltage Darlington transistors.

Conclusion of BU941ZP

The BU941ZP stands out as a high-performance Darlington transistor, offering exceptional voltage/current handling, thermal resilience, and efficiency in power applications. Its TO-247-3 package and Darlington design provide superior heat dissipation and drive simplicity, making it a preferred choice for engineers working with high-power switching, motor control, and amplification circuits. Despite its obsolete status, its proven reliability and compliance ensure continued suitability for demanding industrial and automotive applications.