Zetex transistors tailored for DC motor controls

Zetex has unveiled two bipolar transistors that deliver efficient, high current operation, and meet all the performance requirements of DC motor controls.

With a collector-emitter voltage of 60V, the ZX5T851Z NPN and ZX5T951Z PNP devices can withstand the voltage demands of medium power motor drive circuits. Their high current gain hold-up characteristics accommodate stall currents, while the bipolars' low saturation voltages ensure that on-state losses are kept to a minimum.

The equivalent on-resistance of the NPN and PNP transistors is 30 m? at 6A and 32 m? at 5A, respectively. The NPN can handle a continuous current of 5A and a peak current up to 20A, and PNP can handle 4.3A and 15A. The high gain characteristics of the two transistors are specified up to 10A.

"The transistors' 4.4-by-4mm PCB footprint and power dissipation capability of 2.1W means these SOT89 packaged bipolars offer a viable alternative to traditional SOT223 and DPAK packaged parts," commented David Slack, managing director of Zetex (Asia) Ltd. "They provide an excellent solution, since the current trend in DC motor drive circuitry is towards cost and space reduction."

The ZX5T851Z and ZX5T951Z from Zetex are just two devices from a series of eight new SOT89 packaged transistors covering a VCEO range from 25V to 140V and meeting the requirements of a range of high current circuits, including DC motor control, emergency lighting and automotive load driving.