STMICROELECTRONICS MJE340 NPN Power Transistor 300V 0.5A 20W

The STMICROELECTRONICS MJE340 is a robust silicon planar NPN complementary power transistor designed for medium-power linear and switching applications. Its engineering focuses on efficiency, featuring fast switching times and a very low saturation voltage, which together significantly reduce both switching and conduction losses. This makes it an excellent choice for circuits where performance and energy efficiency are critical.

Complementary to the MJE350 PNP transistor, the MJE340 offers designers a matched pair for push-pull and other symmetrical circuit configurations. A key attribute is its well-controlled DC current gain (hFE) parameter, which enhances circuit reliability and consistency by minimising performance variations between individual components.

Key Specifications & Features

• High Voltage Rating: With a maximum collector-emitter voltage of 300V, it is suitable for a wide range of industrial and power supply applications.
• Medium Power Handling: Capable of a continuous collector current of 500mA and a power dissipation of 20.8W.
• Reliable Construction: Housed in a sturdy TO-225AA through-hole package with 3 pins, ensuring secure mounting and good thermal performance.
• High Gain: Features a minimum DC current gain (hFE) of 240, providing good signal amplification.
• Wide Temperature Range: Can operate at temperatures up to 150°C, ensuring stability in demanding environments.

This transistor is a fundamental component for engineers and hobbyists building reliable amplifiers, power regulators, and efficient switching systems.