The BUL791 is a high-voltage NPN power transistor manufactured by Power Innovations Ltd. It's designed for high-speed switching and high-voltage applications, making it suitable for use in power supplies, motor controls, and other industrial applications. Given its 'END - OF - LIFE' status, finding exact specifications may be difficult, and it is likely being replaced by newer transistors with improved performance and efficiency.

Applications

• Switch-mode power supplies (SMPS)
• Uninterruptible power supplies (UPS)
• Motor control circuits
• High-voltage inverters
• Lighting ballast circuits

Features

• High Voltage Capability: Designed to handle high voltage levels, typically in the range of several hundred volts.
• High Switching Speed: Enables efficient operation in high-frequency switching applications.
• NPN Transistor: A common type of bipolar junction transistor suitable for various amplification and switching purposes.
• Robust Construction: Built to withstand harsh operating conditions.

Benefits

• Efficient Power Conversion: Enables efficient conversion of electrical power in power supplies and inverters.
• Reliable Operation: Provides reliable performance in demanding industrial environments.
• Improved System Performance: Contributes to improved overall system efficiency and stability.

Additional Details

While specific parameters may vary depending on the exact manufacturing batch and Power Innovations Ltd.'s original datasheet (which is now difficult to obtain given its end-of-life status), typical characteristics of the BUL791 include a collector-emitter voltage (VCEO) rating of several hundred volts (e.g., 400V or higher), a collector current (IC) rating of several amperes, and a power dissipation rating suitable for its intended high-power applications. It's commonly packaged in a TO-220 or similar through-hole package for easy mounting and heat sinking. Because it is end-of-life, it is critical to check direct replacement availability from Power Innovations or other manufacturers before designing it into new products.