Rohm is offering a transistor DTDG series which is developed for the drive circuit of solenoids, motors and relays, integrating resistors and a zener diode.

Zener diodes have the function of absorbing back electromotive force surge voltage from L-load to avoid the breakdown of the transistor by overload voltage. Therefore, an external protection diode in this case is not necessary. Input resistors are built-in to enable the direct drive by the control IC (DTDG23YP).

The DTDG series is available in different line-ups such as the MPT3 and the TSMT6 with a different range of voltage, IC, hFE and resistance.

See http://www.rohmeurope.com