The BU921 from STMicroelectronics is a high-voltage ignition coil driver power integrated circuit (IC) that is specifically designed to meet the rigorous demands of automotive ignition systems. This robust IC is capable of driving a conventional ignition coil directly, thus simplifying the design and construction of engine ignition modules.

Key Features

• High Voltage Capability: The BU921 is designed to handle high voltage operations, which is critical for generating the spark in ignition systems.
• Integrated Darlington Pair: It includes a monolithic Darlington configuration with integrated resistors and diodes for inductive load driving, which enhances its reliability and performance.
• Protection Features: The device incorporates built-in protection features such as overcurrent and overtemperature protection, ensuring its longevity and safe operation within the vehicle's ignition system.
• High Current Drive: With its ability to drive high currents, the BU921 is well-suited for high-energy ignition systems that require strong and reliable sparks.

Applications

The BU921 is predominantly used in the automotive industry for ignition systems, but it can also be found in other applications that require high-voltage coil driving capabilities. Its reliability and robustness make it an ideal choice for:

• Automotive ignition coils
• Gasoline engines
• Motorcycle ignition systems
• Industrial engines

Technical Specifications

STMicroelectronics has engineered the BU921 to have the following technical specifications:

• Collector-Emitter Voltage (Vceo): 400V
• Collector Current (Ic): 15A
• Total Power Dissipation (Ptot): 150W
• Operating Junction Temperature Range: -40°C to 150°C

With its focus on delivering high performance in high-voltage applications, the BU921 is a testament to STMicroelectronics' commitment to providing advanced semiconductor solutions for the automotive industry and beyond.