How to determine ESR from datasheet for SAMXON 68UF/450v

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  • Welchs101
    Badcaps Veteran
    • Sep 2008
    • 979
    • USA
    #1

    How to determine ESR from datasheet for SAMXON 68UF/450v

    Hi,

    I measured the ESR value for a large 68uF cap....measured ~ 52 using a friends ESR meter which i need to give back.

    My friend said this was high but i was wondering what the ESR value should be.

    I am enclosing a pic of the cap.

    I cant seem to find datasheet or any info on the ESR for this cap. Can someone help?
    Attached Files
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: How to determine ESR from datasheet for SAMXON 68UF/450v

      Originally posted by Welchs101
      Hi,

      I measured the ESR value for a large 68uF cap....measured ~ 52 using a friends ESR meter which i need to give back.

      My friend said this was high but i was wondering what the ESR value should be.

      I am enclosing a pic of the cap.

      I cant seem to find datasheet or any info on the ESR for this cap. Can someone help?
      The ESR for caps like those is usually not specified; they don't endure the high frequency surges the SPMS output caps do. HOWEVER, I believe you can find an approximate value. I just did a search on my favorite vendor and found the ESR speced on three equivalent (68uF, 450V) caps. It ranged from 2 ohms to 5 ohms. Seven other hits from the same search did not have their ESR listed.

      IMHO, your friend is correct; that value is very high.

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • Welchs101
          Badcaps Veteran
          • Sep 2008
          • 979
          • USA
          #3
          Re: How to determine ESR from datasheet for SAMXON 68UF/450v

          Thanks. Thats exactly what i needed to know.

          If you still have the link to that spec i would like to take a look at it.

          Thanks again!!!!!!!!!!!!!!!!!!!!!!!!!!

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA
              #4
              Re: How to determine ESR from datasheet for SAMXON 68UF/450v

              Originally posted by Welchs101
              Thanks. Thats exactly what i needed to know.

              If you still have the link to that spec i would like to take a look at it.

              Thanks again!!!!!!!!!!!!!!!!!!!!!!!!!!
              Go to Digikey's site and do a search on 68uF, 450 Volt through-hole caps in stock.

              PlainBill
              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                Comment

                • Wizard
                  Badcaps Legend
                  • Mar 2008
                  • 2296
                  #5
                  Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                  Is these caps on PFC circuit? Then low ESR is necessary.

                  Cheers, Wizard

                    Comment

                    • Welchs101
                      Badcaps Veteran
                      • Sep 2008
                      • 979
                      • USA
                      #6
                      Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                      What is a PFC circuit?

                        Comment

                        • Welchs101
                          Badcaps Veteran
                          • Sep 2008
                          • 979
                          • USA
                          #7
                          Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                          These caps came off a power supply board from an lcd monitor. Does this help?

                            Comment

                            • PlainBill
                              Badcaps Legend
                              • Feb 2009
                              • 7034
                              • USA
                              #8
                              Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                              Originally posted by Welchs101
                              What is a PFC circuit?
                              Power Factor Correction. It's a 'front end' often found on LCD and plasma TVs. I don't think they would be used on a normal (< 24" ) monitor, but why not post pictures of the monitor and we can be sure.

                              PlainBill
                              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                Comment

                                • Welchs101
                                  Badcaps Veteran
                                  • Sep 2008
                                  • 979
                                  • USA
                                  #9
                                  Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                                  here is a pic of the power supply board.....is this what you wanted?
                                  Attached Files

                                    Comment

                                    • PlainBill
                                      Badcaps Legend
                                      • Feb 2009
                                      • 7034
                                      • USA
                                      #10
                                      Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                                      Originally posted by Welchs101
                                      here is a pic of the power supply board.....is this what you wanted?
                                      Yes. And to my untutored eye, they just used a pair of caps in parallel to reduce the height of the assembly. No special low ESR caps required. Still, an ESR of 85 is WAY too high.

                                      PlainBill
                                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                        Comment

                                        • Wizard
                                          Badcaps Legend
                                          • Mar 2008
                                          • 2296
                                          #11
                                          Re: How to determine ESR from datasheet for SAMXON 68UF/450v

                                          Then this one does not utilize PFC. Cap away.

                                          Cheers, Wizard

                                            Comment

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