MMBTA42

The MMBTA42 is an NPN epitaxial planar transistor from Fairchild Semiconductor, suitable for medium power amplification and switching applications. It is designed as a high voltage amplifier.

Key electrical characteristics include a collector-emitter breakdown voltage of 300V and a collector-base breakdown voltage of 300V. The device can handle a continuous collector current of up to 0.2A. Its DC current gain (hFE) is rated at a minimum of 25 at 1mA collector current, 40 at 10mA, and 40 at 30mA, all measured at 10V collector-emitter voltage.

The transistor features a collector-emitter saturation voltage of 0.5V maximum and a base-emitter saturation voltage of 0.9V maximum at a collector current of 20mA and base current of 2mA. The collector output capacitance is typically 3pF at 20V collector-base voltage and 1MHz frequency. The transition frequency (fT) is a minimum of 50MHz at 10mA collector current and 20V collector-emitter voltage.

Packaged in a SOT-23 surface mount package, the MMBTA42 is supplied on tape and reel with a standard package quantity of 3000 units. It operates within a junction and storage temperature range of -55°C to +150°C. The total device dissipation is rated at 0.35W, with a thermal resistance from junction to ambient of 357°C/W.