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Mystery Motorola Diode ???

Discussion in 'Electronic Components' started by spock, Mar 12, 2007.

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  1. spock

    spock Guest

    Hello Everyone
    I have a what looks like a diode in a TO220 package but only two pins it has
    the motorola logo and the following marking
    top line 98 08 some have 98 11 so I think this is the production code
    next line U805 maybe a inhouse number
    followed by motorola logo and KA
    any idea what it is as I have a few of these

    Thanks
     
  2. Ross Herbert

    Ross Herbert Guest

    MUR805
    http://ece-www.colorado.edu/~ecen4517/course_material/datasheets/mur820rev4.pdf
     
  3. Is the mounting tab isolated or metal? Was it fixed to a PCB with the tab or
    vertical?

    Peter
     
  4. spock

    spock Guest

    These diodes are unused, I was wondering where I could use them as
    I have over 50 of them.

    Thanks for the replys
     
  5. They have high current, low(ish) forward voltage, and they're fast, so one
    use might be for general protection of DC circuits against reverse
    polarity, especially those that might be destroyed before a fuse can blow.
    Connect them across the supply terminals, reverse biased, just after the
    input fuse. This will make sure the only casualty of reverse connection is
    that fuse. Especially useful for stuff plugged to car batteries. They're
    meant for better things, but if you already have them...

    Someone might come up with a more sensible answer soon.
     
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