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IC pins - what is the metal ?

Discussion in 'Electronic Repair' started by Nigel Cook, Apr 1, 2004.

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  1. Nigel Cook

    Nigel Cook Guest

    What are IC / Transistor pins etc made of ?.
    The name for the material and its alloyed? constituents
    I thought it was something called kynar but that may be wrong.

    e-mail (removing .....) .....k
    electronic hints and repair briefs
    http://homepages.tcp.co.uk/~diverse

    Nigel,Diverse Devices,Southampton,England
     
  2. jtech

    jtech Guest

    Tinned brass usually, some may be gold plated brass.
     
  3. Hmm... think you are. Kynar is an insulator.
    FAIK tin plated brass is the most common.

    petrus
     
  4. This is April 1. :)

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  5. Nigel Cook

    Nigel Cook Guest

    Explains why i could not find the constituent metals in kynar by keyword
    search - must be some other trade name or something I mis-remembered as
    kynar.
    Some formulations seem to be hard and some soft or is it just work-hardening
    of brass in the formation of the pins ?

    For hoaxes how about this for someoe's effort
    http://www.netcentral.co.uk/satcure/audio/scam.htm
     
  6. Google for "kynar wire" (kynar insulated wire) to find thousends of hits.
    Don't know.
    petrus
     
  7. Kynar is a mechanically tough insulation that used to be used on wirewrap
    wire. It has nothing to do with IC pins.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
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  8. Jerry Maple

    Jerry Maple Guest

    I believe the word everybody's been searching for is "kovar".

    Jerry
     
  9. Nigel Cook

    Nigel Cook Guest

    Yep, must be my failing memory.
    Just searched for Kovar and one firmulation for that
    used in leads is an alloy of Iron,Nickel and Cobalt
    no zinc which was what i was expecting
     
  10. exray

    exray Guest

    too much time on your hands, mate.


    -exm
     
  11. Nigel Cook

    Nigel Cook Guest

    The presence of iron explains why I have occassionly come across rusted IC
    pins when the ICs have been stored in certain types of conductive foam
    that seem to have taken moisture out of the air.
     
  12. Jim Adney

    Jim Adney Guest

    It's possible, but I doubt it. Kovar is used for wires to be sealed in
    glass, and similar applications. I believe it has a low coefficient of
    expansion (or just happens to match that of glass.) I've used it as a
    match to alumina ceramic.

    Yes, Kovar will rust. It is also magnetic, which makes this an easy
    hypothesis to test. I'll try this here in a minute.

    It's just possible that Kovar was used for the lead frame in the early
    days when IC bodies were ceramic.

    -
     
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