Power Electronics

Bipolar Transistors Raise Efficiency of DC Motor Controls

The efficient high-current operation of the new bipolar transistors from Zetex Semiconductors meets all the performance requirements of dc motor control. Provided in the SOT89 package, they also are a more cost-effective alternative to much larger packaged parts.

With a collector-emitter voltage of 60 V, the ZX5T851Z NPN and ZX5T951Z, PNP devices easily withstand the voltage demands of medium power motor drive circuits.

Their high current gain hold-up characteristics accommodate stall currents, and 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 respectively 30 mΩ at 6 A and 32 mΩ at 5 A. The NPN can handle a continuous current of 5 A and a peak current up to 20 A. The equivalent figures for the PNP are 4.3 A and 15 A.

The transistors’ feature a 4.4-mm × 4.0-mm footprint and can dissipate up to 2.1 W. In quantities of 10,000, the ZX5T851Z and ZX5T951Z are priced at $0.24 each.

For more information, visit www.zetex.com.

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