Identifing a SMD cap.

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  • Rob Northen
    Senior Member
    • Jan 2010
    • 137
    • Denmark
    #1

    Identifing a SMD cap.

    Could someone please help.
    I'am recapping some old pentium SBC boards, with some SMD caps on.
    They all have folowing txt;

    100
    jHA
    7f3

    I know its a 100mf cap, cause my ESR meter tells me that. I also guess its
    rated around 16v, as the maximum voltage measured is 12v.
    But i need a datasheet, to get the ESR values. I've only succed in removing one, with both terminals intact, and it measures around 8,2 ohms, which
    does not sound healthy.

    Edit:
    I tried Google and all data sheet, but no luck
    Tags: None
    • Rob Northen
      Senior Member
      • Jan 2010
      • 137
      • Denmark
      #2
      Re: Identifing a SMD cap.

      Anyone, please ?

        Comment

        • momaka
          master hoarder
          • May 2008
          • 12170
          • Bulgaria
          #3
          Re: Identifing a SMD cap.

          The voltage is probably coded in one of the two strings (likely in "7f3"), but I can't seem to find anything either. Could be manufacturer-specific, too.

          One thing you can do is find all of the caps on the board with those markings and then see what's the highest voltage rail they are connected to. If one of them is connected to the 12v rail, for example, then they are likely all rated for 16v or 25v.

            Comment

            • kikkoman
              Badcaps Veteran
              • Jul 2007
              • 691
              #4
              Re: Identifing a SMD cap.

              you're talking about electrolytic caps (can style) and not tantalum i guess?

              i'd go for 0.5 ohms max ESR. that's easily achievable with modern caps, and back in the pentium days, extremely low ESR types were seldom used.
              "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin slitting throats." - H.L. Mencken

                Comment

                • Rob Northen
                  Senior Member
                  • Jan 2010
                  • 137
                  • Denmark
                  #5
                  Re: Identifing a SMD cap.

                  Thanks kikkoman.
                  I'll go for Panasonic FC then

                    Comment

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