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latching and holding current

Discussion in 'Electronic Basics' started by twiki, Feb 7, 2004.

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  1. twiki

    twiki Guest

    In SCR devices, which difference between these two currents?
  2. CFoley1064

    CFoley1064 Guest

    From: twiki
    Latching current is another name for gate trigger current -- it's a measure of
    the minimum current you have to apply to the gate of an SCR to be guaranteed it
    will turn on (given that there's a minimum voltage between anode and cathode).
    Holding current is the specified minimum current that must be flowing from
    anode to cathode (with no gate current) and still be guaranteed that the SCR
    will not turn off.

    As an example, the latching (gate trigger) current for a 2N5062 (logic level
    SCR in TO-92 pkg) is 350 uA over the entire temp range, and the holding current
    is10 mA over temp.

    Good luck
  3. Jamie

    Jamie Guest

    latching is the required minimum current on the gate that should
    be used to turn it on.
    the holding current is the minimum current it can be reduced down
    to before it opens the path between the cathod and anode.
    usually there is also a minimum voltage rating due to diode
    cut off voltages internally.
    for example many scr's won't latch if the voltage across the
    anode and cathod is below 1.0, there are the higher power types that
    even have a much higher voltage drop out too.
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