Help ID this

Discussion in 'General Electronics Chat' started by DFW, May 8, 2014.

  1. DFW

    Thread Starter New Member

    May 8, 2014
    Hello All,

    I am currently working on 2 boards that make up the control portion of a hottub heater and am having no luck identifying a component on one of the boards that is blown and creating an open circuit between the pins that power the blower motor.

    The component looks like a standard 78xx voltage regulator (same package style, black plastic square, metal heatsink with screw hole, 3 pin)

    Upper left corner is marked - A
    Upper right corner marked - 8
    Across the middle - MA C15
    Across the bottom - ON (in a circle, ON Semiconductor?) 0538

    Any help identifying this part and/or what may have caused it to fail would be greatly appreciated :)
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    DFW likes this.
  3. DFW

    Thread Starter New Member

    May 8, 2014
    Dave, Thanks very much! Part ordered ($1.73 :) )