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surge resistors

Discussion in 'General Electronics Discussion' started by ccc, Aug 30, 2011.

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  1. ccc

    ccc

    4
    0
    Aug 30, 2011
    hey everyone!!

    i just realised that i ordered surge resistors for my project instead of normal ones. what difference does it make?

    should i run to get the other ones? because this wasn't specified in the schematic.

    thanks!!! :)
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    What is a surge resistor?
     
  3. ccc

    ccc

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    Aug 30, 2011
    humm well.... i would say it would be used to avoid a surge in current in case it happened?
    the question is does it make a difference in a circuit?
     
  4. ccc

    ccc

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    Aug 30, 2011
  5. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Yes, that definitely helps.
    The term "surge resistor" is new to me, and meaningless afaik.
    It's easily confused with other current & voltage surge protection resistors (NTC's, PTC's, VDR's, & fuse resistors).

    The spec's however seems to indicate it can be used as an ordinary resistor:
    Resistance: 39kohm
    Resistance Tolerance: ± 1%
    Power Rating: 250mW
    Voltage Rating: 150V
    Temperature Coefficient: ± 200ppm/°C

    Looking further, into the datasheet, reveals the full story.
    The SG73P 2A is a resistor capable of withstanding 100W pulses up to 10us, and 10W for 10ms, without being damaged.

    So you can safely use it (and abuse it) unless the schematic calls for a fuse resistor (they break easily, to protect other components).
     
  6. ccc

    ccc

    4
    0
    Aug 30, 2011
    thanks so much for the help!!!! :)
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
    2,779
    Jan 21, 2010
    They will work fine as regular resistors.

    As a bonus, if you overload them they have documented performance!
     
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