The BUL138 is a high voltage fast-switching NPN power transistor designed by STMicroelectronics, a leader in semiconductor solutions. This device is particularly suited for high-performance switching applications, offering a robust and reliable component for designers and engineers.

Key Features

• Voltage Capabilities: The BUL138 boasts a collector-emitter voltage (V<sub>CEO) of 400V, ensuring it can handle high voltage applications with ease.
• Current Handling: With a collector current (I<sub>C) rating of up to 4A, this transistor can manage significant current loads, making it ideal for power regulation and conversion systems.
• Speed: A fast switching speed is critical in power applications, and the BUL138 delivers with a fast switching response, minimizing energy losses and improving efficiency.
• Power Dissipation: It features a power dissipation (P<sub>C) of 40W, which allows for effective operation without overheating, even under strenuous conditions.
• Configuration: The device comes in a TO-220 package, a widely used and easily mountable form factor that aids in heat dissipation and simplifies PCB design.

Applications

The BUL138 is versatile and can be used in a variety of applications, including:

• Switching regulators and power management systems
• Motor control circuits for high power motors
• Inverter circuits for renewable energy solutions
• Electronic ballasts for lighting
• High-frequency power supplies

Reliability and Quality

STMicroelectronics is committed to delivering high-quality products that meet rigorous industry standards. The BUL138 is no exception, offering exceptional performance and reliability. Its robust construction ensures long-term stability and functionality in a wide range of environmental conditions.

For detailed specifications, application notes, and additional resources, customers can visit the STMicroelectronics website or contact their support team for comprehensive technical assistance.