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32X8 SRAM Replacement

Discussion in 'Electronic Basics' started by Uriah, Mar 19, 2009.

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  1. Uriah

    Uriah Guest

    I need to replace a SRAM chip on a piece if test equipment it is a
    HM62256ALP-8. A 28 pin DIP. It is a 32X8 Hi-Speed SRAM. Can I
    replace this with any 28 pin SRAM chip or do I need to find an exact
    replacement or an exact cross reference. Is this like DDR memory in a
    computer where you can buy what ever is selling at CompUSA? I think I
    have some chips that are the right speed but trying to find info on if
    they would work doesn't seem to be that easy. So I thought I would
    ask you guys.

    Thanks so much
    Russ
     
  2. No, not usually.
    Yes, pretty much. The 62256 is a bog standard device with countless working
    sustitutes.
    Was common in computer cache memory many years ago, which were a good (free)
    source for these chips after computers were scrapped.
    At the peek of the market for these devices there was even a scam that
    substituted fake cache SRAM chips and doctoring the BIOS to show they were
    working when in fact they were empty chips.
    Just match or better the speed and you should be fine.

    Dave.
     
  3. whit3rd

    whit3rd Guest

    All the above is true, BUT there are package differences, while "DDR"
    is in
    a known socketable type of package. DIP with .300" width, and .with .
    600"
    width, and in various surface mount types, are all available.
    The old '386 motherboards used mainly .300" DIP packages.
     
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