Diodes Inc. NPN Bipolar Transistor, SOT-23, 400V, 225mA

The Diodes Inc. NPN Bipolar Transistor is a high-voltage, low-power surface-mount component designed for efficient switching and amplification in compact electronic circuits. Its NPN polarity makes it suitable for a wide range of applications where current needs to be controlled from a positive voltage source. With a robust collector-emitter voltage rating of 400V, it can handle significant potential differences, making it ideal for offline power supplies, lighting ballasts, and other high-voltage environments.

This transistor delivers a continuous collector current of 225mA and a power dissipation of 500mW, providing a reliable balance of current handling and thermal performance. Packaged in the industry-standard SOT-23 case, it is perfect for space-constrained PCB designs, enabling high-density board layouts without compromising on electrical performance. The surface-mount (SMD) design facilitates automated assembly, improving manufacturing efficiency and consistency.

Key electrical characteristics include a transition frequency of 50MHz, supporting moderate-speed switching applications, and a DC current gain (hFE) of 15, ensuring stable amplification. It operates reliably across a broad temperature range up to a maximum of 150°C, making it suitable for demanding industrial and automotive environments where thermal stability is critical.

This component is an essential building block for designers, offering a dependable solution for signal amplification, load switching, and driver stages in power management circuits.