Integrated relay driver optimizes inductive load control
The relay driver is offered in single and dual driver configurations, housed respectively in SOT23 and SOT26 packages, and can replace between 3 and 6 discrete components. With a Zener diode included across the device’s bipolar transistor output, the need for an external free-wheeling diode is removed, and by clamping at 6.6V the Zener also sinks inductive currents to ground, thereby reducing noise due to EMI.
Integrating robust pre-biased transistor technology delivering high transient isolation between input and output, DRDC3105 will protect sensitive input circuitry and guarantee to put its output into a safe off-state condition when the input is lost or disconnected. The bipolar’s low saturation characteristic means the device will drive current up to 0.5A through the coil when on and achieve near-zero current consumption in the off-state.
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