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PIC outputs driving relays directly?

Discussion in 'Electronic Design' started by Steve Sousa, Oct 3, 2003.

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  1. Steve Sousa

    Steve Sousa Guest


    Has anyone used PIC outputs to drive small relays directly?
    Would there be any advantage in using a driver transistor, provided the high
    side of the relay is the same supply as the PIC, 5 Volts.

    Thank you.

  2. I've driven small reed relays directly from the PIC's outputs with no
    problems. The relays were rated at 5V 20mA and had internal diodes to
    suppress inductive transients from the coil at turn off. I guess it should
    be OK, as long as you are within the PIC's outout current spec and always
    use a diode (reverse-biased across the coil terminals).

  3. Steve Sousa

    Steve Sousa Guest


    Thank you both for your answers.
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