Motor drivers with protection circuitry deliver all-round savings

Rohm Electronics has introduced a range of transistors for use in solenoid, motor and relay drivers, which implement essential protection features internally to save cost, footprint and component count.

The DTDG series transistors integrate a zener diode to absorb damaging back-EMF surges induced when driving inductive loads, thereby saving external circuitry. By also implementing internal input resistors, the relays can be driven directly from the controller IC. Available variants implement either a single base-emitter resistor or twin-resistor network including a seriesconnected input resistor.

Other valuable properties include high DC-current gain, which allows use with a wide variety of loads, and low collector-emitter saturation voltage for low losses and low heat dissipation.

Two types of surface-mount packages are available, including the MPT3 SOT-89 package with a total profile of 1.5mm and the TSMT6 dual inline package with a profile of 0.85mm.

 

APPLICATIONS Automotive subsystems Seat, window and mirror adjusters Heater flap and fan Headlamp-position adjusters Audio systems

 

 

Rohm/DTDG series