DESCRIPTION

The URD3105 is an integrated solid-state DC relay driver that can

switch inductive loads. It provides a robust driver interface by acting as

a buffer stage between sensitive logic circuits and that of 3V to 6V DC

inductive relay coils. With a low input drive current requirement, the

URD3105 only has slight loading on the input circuitry and it will

provide good transient isolation between output and input channels.

The output switch is guaranteed by design to go open-circuit and

fall into the off-state condition when input drive is lost or disconnected.

The URD3105 in the SOT23 and SOT26, the URD3105 comes as a

single or dual die which can replace three to six individual discrete

components within a single integrated package, including a Zener

across the output. The Zener will clamp at 6.6V to sink inductive

currents to ground which will reduce EMI noise in the system. By

integrating the Zener, the URD3105 eliminates the need for an external

free-wheeling diode and allows the driving of inductive loads such as

relays, solenoids, incandescent lamps, and small DC motors in.

FEATURES

* Inductive load driver capable of driving 3 to 6V DC coils

* Optimized to switch inductive loads from supply of 3 to 5V with the

capability to drive coils up to 2.5W from a 5V rail

* Fully integrated into a single SOT23 or dual SOT26 package to

minimize footprint area and reduce number of components

* Includes zener across output to reduce EMI noise

* Internal low saturation BJT to reduce power dissipation in driving high

currents into the coil

* Output guaranteed to be in off-state condition during no input

* Near-Zero quiescent supply current in off-state condition with minimal

leakage

* With ESD capability