Capacitors with same voltage, same capacitance, same temp, different diameter?What other than capacitor rot could cause a capacitor to bulge and fail?Reliability and failure mode of MLCC (chip capacitors)Capacitors and capacitanceAluminum Electrolytic Capacitor Dissipation FactorCapacitance and Voltage of CapacitorsDifference between capacitors of same value but different sizesCan i use different capacitors?Will two capacitors with different voltage ratings and identical capacitance work the same?What killed these X2 caps?Parallel Capacitors with different voltages

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Capacitors with same voltage, same capacitance, same temp, different diameter?


What other than capacitor rot could cause a capacitor to bulge and fail?Reliability and failure mode of MLCC (chip capacitors)Capacitors and capacitanceAluminum Electrolytic Capacitor Dissipation FactorCapacitance and Voltage of CapacitorsDifference between capacitors of same value but different sizesCan i use different capacitors?Will two capacitors with different voltage ratings and identical capacitance work the same?What killed these X2 caps?Parallel Capacitors with different voltages






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;









3















$begingroup$


I recently had an old LCD monitor power supply go bad and figured I would try replacing the caps, all four of these were bulged and or leaking. They are all rated to 105 degrees C, all 1000uF and 25V yet two of them are much higher diameter. In my experience with a physically larger capacitor, you either get more voltage (more plate separation?) or more capacitance (more plates?), why are these caps different diameter?



caps



Side question, the board had more than enough space for the larger caps everywhere, why not use the large (or small) caps everywhere for higher quantity discounts.










share|improve this question











$endgroup$














  • $begingroup$
    The 'C' ratings are different?
    $endgroup$
    – Soldersmoke
    Sep 7 at 17:37










  • $begingroup$
    Im pretty sure the 'C' is a model number
    $endgroup$
    – Sam
    Sep 7 at 17:38






  • 1




    $begingroup$
    The two in the middle look fine. The lower one is bad (bulged.) Can't see enough of the top one to say.
    $endgroup$
    – JRE
    Sep 7 at 18:20










  • $begingroup$
    @jre the middle two were leaking, that being said, the board didn't work until i replaced all 4
    $endgroup$
    – Sam
    Sep 7 at 18:25






  • 2




    $begingroup$
    If by "leaking" you mean the white stuff, then you should know that the white stuff is glue and didn't come out of those capacitors.
    $endgroup$
    – JRE
    Sep 7 at 18:31

















3















$begingroup$


I recently had an old LCD monitor power supply go bad and figured I would try replacing the caps, all four of these were bulged and or leaking. They are all rated to 105 degrees C, all 1000uF and 25V yet two of them are much higher diameter. In my experience with a physically larger capacitor, you either get more voltage (more plate separation?) or more capacitance (more plates?), why are these caps different diameter?



caps



Side question, the board had more than enough space for the larger caps everywhere, why not use the large (or small) caps everywhere for higher quantity discounts.










share|improve this question











$endgroup$














  • $begingroup$
    The 'C' ratings are different?
    $endgroup$
    – Soldersmoke
    Sep 7 at 17:37










  • $begingroup$
    Im pretty sure the 'C' is a model number
    $endgroup$
    – Sam
    Sep 7 at 17:38






  • 1




    $begingroup$
    The two in the middle look fine. The lower one is bad (bulged.) Can't see enough of the top one to say.
    $endgroup$
    – JRE
    Sep 7 at 18:20










  • $begingroup$
    @jre the middle two were leaking, that being said, the board didn't work until i replaced all 4
    $endgroup$
    – Sam
    Sep 7 at 18:25






  • 2




    $begingroup$
    If by "leaking" you mean the white stuff, then you should know that the white stuff is glue and didn't come out of those capacitors.
    $endgroup$
    – JRE
    Sep 7 at 18:31













3













3









3


1



$begingroup$


I recently had an old LCD monitor power supply go bad and figured I would try replacing the caps, all four of these were bulged and or leaking. They are all rated to 105 degrees C, all 1000uF and 25V yet two of them are much higher diameter. In my experience with a physically larger capacitor, you either get more voltage (more plate separation?) or more capacitance (more plates?), why are these caps different diameter?



caps



Side question, the board had more than enough space for the larger caps everywhere, why not use the large (or small) caps everywhere for higher quantity discounts.










share|improve this question











$endgroup$




I recently had an old LCD monitor power supply go bad and figured I would try replacing the caps, all four of these were bulged and or leaking. They are all rated to 105 degrees C, all 1000uF and 25V yet two of them are much higher diameter. In my experience with a physically larger capacitor, you either get more voltage (more plate separation?) or more capacitance (more plates?), why are these caps different diameter?



caps



Side question, the board had more than enough space for the larger caps everywhere, why not use the large (or small) caps everywhere for higher quantity discounts.







capacitor






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Sep 7 at 23:35







Sam

















asked Sep 7 at 17:24









SamSam

5193 silver badges12 bronze badges




5193 silver badges12 bronze badges














  • $begingroup$
    The 'C' ratings are different?
    $endgroup$
    – Soldersmoke
    Sep 7 at 17:37










  • $begingroup$
    Im pretty sure the 'C' is a model number
    $endgroup$
    – Sam
    Sep 7 at 17:38






  • 1




    $begingroup$
    The two in the middle look fine. The lower one is bad (bulged.) Can't see enough of the top one to say.
    $endgroup$
    – JRE
    Sep 7 at 18:20










  • $begingroup$
    @jre the middle two were leaking, that being said, the board didn't work until i replaced all 4
    $endgroup$
    – Sam
    Sep 7 at 18:25






  • 2




    $begingroup$
    If by "leaking" you mean the white stuff, then you should know that the white stuff is glue and didn't come out of those capacitors.
    $endgroup$
    – JRE
    Sep 7 at 18:31
















  • $begingroup$
    The 'C' ratings are different?
    $endgroup$
    – Soldersmoke
    Sep 7 at 17:37










  • $begingroup$
    Im pretty sure the 'C' is a model number
    $endgroup$
    – Sam
    Sep 7 at 17:38






  • 1




    $begingroup$
    The two in the middle look fine. The lower one is bad (bulged.) Can't see enough of the top one to say.
    $endgroup$
    – JRE
    Sep 7 at 18:20










  • $begingroup$
    @jre the middle two were leaking, that being said, the board didn't work until i replaced all 4
    $endgroup$
    – Sam
    Sep 7 at 18:25






  • 2




    $begingroup$
    If by "leaking" you mean the white stuff, then you should know that the white stuff is glue and didn't come out of those capacitors.
    $endgroup$
    – JRE
    Sep 7 at 18:31















$begingroup$
The 'C' ratings are different?
$endgroup$
– Soldersmoke
Sep 7 at 17:37




$begingroup$
The 'C' ratings are different?
$endgroup$
– Soldersmoke
Sep 7 at 17:37












$begingroup$
Im pretty sure the 'C' is a model number
$endgroup$
– Sam
Sep 7 at 17:38




$begingroup$
Im pretty sure the 'C' is a model number
$endgroup$
– Sam
Sep 7 at 17:38




1




1




$begingroup$
The two in the middle look fine. The lower one is bad (bulged.) Can't see enough of the top one to say.
$endgroup$
– JRE
Sep 7 at 18:20




$begingroup$
The two in the middle look fine. The lower one is bad (bulged.) Can't see enough of the top one to say.
$endgroup$
– JRE
Sep 7 at 18:20












$begingroup$
@jre the middle two were leaking, that being said, the board didn't work until i replaced all 4
$endgroup$
– Sam
Sep 7 at 18:25




$begingroup$
@jre the middle two were leaking, that being said, the board didn't work until i replaced all 4
$endgroup$
– Sam
Sep 7 at 18:25




2




2




$begingroup$
If by "leaking" you mean the white stuff, then you should know that the white stuff is glue and didn't come out of those capacitors.
$endgroup$
– JRE
Sep 7 at 18:31




$begingroup$
If by "leaking" you mean the white stuff, then you should know that the white stuff is glue and didn't come out of those capacitors.
$endgroup$
– JRE
Sep 7 at 18:31










4 Answers
4






active

oldest

votes


















7

















$begingroup$

The answer lies in the datasheet and the designer requirements for cost, space, reliability, cost and temperature rating. There are many choices. (Did I say cost;)



http://www.capxongroup.com/prodsearch.aspx?lc=1&siteid=&ver=&usid=&mnuid=2082&modid=16&mode=



The Part Number defines; e.g. KF102M025I200A



  • KF Family construction of foil film and dielectric, there are many others

  • xxe value 102 for C in uF with exponents 10 00 uf

  • M = 20 % tolerance on C

  • xxx voltage rating

  • A letter code for Case Dia & radial lead space

  • xxx height xx.x mm

The height and Voltage reduce ESR while the diameter affects everything.



The parameters for selection of these low ESR caps are;



  • C, Vdc, Size, max temp range, xxxx Hrs Endurance of accelerated MTBF at extreme temp & RMS ripple current


  • the electrical variables for these choices are % DF at 120Hz, Ripple current @ 100kHz, @ 10kHz, ESR


I don't know the formula, but the diameter is determined by foil area, thickness, turns, ESR,and temp rise due to ripple current rating at max temp for xxxx hours due to thermal conductance and temp rise above max ambient rating and Arrhenius effects on Endurance.






share|improve this answer












$endgroup$






















    4

















    $begingroup$

    Either they had different ESR ratings, as @hacktastical suggests, or the bigger ones are just an older design and/or the board manufacturer buys whatever is cheaper at the moment, then throws them into one bin. Cap manufacturers are getting better at making smaller caps, they're getting better at reducing manufacturing variations so that they can consistently hit ratings with not-quite-as-good caps, and some of them just plain lie.






    share|improve this answer










    $endgroup$














    • $begingroup$
      If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
      $endgroup$
      – supercat
      Sep 8 at 18:49


















    2

















    $begingroup$

    The relatively larger caps were likely to be a low ESR type, perhaps also with a higher thermal rating. That has some influence on the size/density.






    share|improve this answer










    $endgroup$






















      1

















      $begingroup$

      More advanced etching processes can increase surface area of foils, allowing higher capacitance in smaller packages.






      share|improve this answer










      $endgroup$
















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        4 Answers
        4






        active

        oldest

        votes








        4 Answers
        4






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        7

















        $begingroup$

        The answer lies in the datasheet and the designer requirements for cost, space, reliability, cost and temperature rating. There are many choices. (Did I say cost;)



        http://www.capxongroup.com/prodsearch.aspx?lc=1&siteid=&ver=&usid=&mnuid=2082&modid=16&mode=



        The Part Number defines; e.g. KF102M025I200A



        • KF Family construction of foil film and dielectric, there are many others

        • xxe value 102 for C in uF with exponents 10 00 uf

        • M = 20 % tolerance on C

        • xxx voltage rating

        • A letter code for Case Dia & radial lead space

        • xxx height xx.x mm

        The height and Voltage reduce ESR while the diameter affects everything.



        The parameters for selection of these low ESR caps are;



        • C, Vdc, Size, max temp range, xxxx Hrs Endurance of accelerated MTBF at extreme temp & RMS ripple current


        • the electrical variables for these choices are % DF at 120Hz, Ripple current @ 100kHz, @ 10kHz, ESR


        I don't know the formula, but the diameter is determined by foil area, thickness, turns, ESR,and temp rise due to ripple current rating at max temp for xxxx hours due to thermal conductance and temp rise above max ambient rating and Arrhenius effects on Endurance.






        share|improve this answer












        $endgroup$



















          7

















          $begingroup$

          The answer lies in the datasheet and the designer requirements for cost, space, reliability, cost and temperature rating. There are many choices. (Did I say cost;)



          http://www.capxongroup.com/prodsearch.aspx?lc=1&siteid=&ver=&usid=&mnuid=2082&modid=16&mode=



          The Part Number defines; e.g. KF102M025I200A



          • KF Family construction of foil film and dielectric, there are many others

          • xxe value 102 for C in uF with exponents 10 00 uf

          • M = 20 % tolerance on C

          • xxx voltage rating

          • A letter code for Case Dia & radial lead space

          • xxx height xx.x mm

          The height and Voltage reduce ESR while the diameter affects everything.



          The parameters for selection of these low ESR caps are;



          • C, Vdc, Size, max temp range, xxxx Hrs Endurance of accelerated MTBF at extreme temp & RMS ripple current


          • the electrical variables for these choices are % DF at 120Hz, Ripple current @ 100kHz, @ 10kHz, ESR


          I don't know the formula, but the diameter is determined by foil area, thickness, turns, ESR,and temp rise due to ripple current rating at max temp for xxxx hours due to thermal conductance and temp rise above max ambient rating and Arrhenius effects on Endurance.






          share|improve this answer












          $endgroup$

















            7















            7











            7







            $begingroup$

            The answer lies in the datasheet and the designer requirements for cost, space, reliability, cost and temperature rating. There are many choices. (Did I say cost;)



            http://www.capxongroup.com/prodsearch.aspx?lc=1&siteid=&ver=&usid=&mnuid=2082&modid=16&mode=



            The Part Number defines; e.g. KF102M025I200A



            • KF Family construction of foil film and dielectric, there are many others

            • xxe value 102 for C in uF with exponents 10 00 uf

            • M = 20 % tolerance on C

            • xxx voltage rating

            • A letter code for Case Dia & radial lead space

            • xxx height xx.x mm

            The height and Voltage reduce ESR while the diameter affects everything.



            The parameters for selection of these low ESR caps are;



            • C, Vdc, Size, max temp range, xxxx Hrs Endurance of accelerated MTBF at extreme temp & RMS ripple current


            • the electrical variables for these choices are % DF at 120Hz, Ripple current @ 100kHz, @ 10kHz, ESR


            I don't know the formula, but the diameter is determined by foil area, thickness, turns, ESR,and temp rise due to ripple current rating at max temp for xxxx hours due to thermal conductance and temp rise above max ambient rating and Arrhenius effects on Endurance.






            share|improve this answer












            $endgroup$



            The answer lies in the datasheet and the designer requirements for cost, space, reliability, cost and temperature rating. There are many choices. (Did I say cost;)



            http://www.capxongroup.com/prodsearch.aspx?lc=1&siteid=&ver=&usid=&mnuid=2082&modid=16&mode=



            The Part Number defines; e.g. KF102M025I200A



            • KF Family construction of foil film and dielectric, there are many others

            • xxe value 102 for C in uF with exponents 10 00 uf

            • M = 20 % tolerance on C

            • xxx voltage rating

            • A letter code for Case Dia & radial lead space

            • xxx height xx.x mm

            The height and Voltage reduce ESR while the diameter affects everything.



            The parameters for selection of these low ESR caps are;



            • C, Vdc, Size, max temp range, xxxx Hrs Endurance of accelerated MTBF at extreme temp & RMS ripple current


            • the electrical variables for these choices are % DF at 120Hz, Ripple current @ 100kHz, @ 10kHz, ESR


            I don't know the formula, but the diameter is determined by foil area, thickness, turns, ESR,and temp rise due to ripple current rating at max temp for xxxx hours due to thermal conductance and temp rise above max ambient rating and Arrhenius effects on Endurance.







            share|improve this answer















            share|improve this answer




            share|improve this answer








            edited Sep 7 at 19:34

























            answered Sep 7 at 19:29









            Tony Stewart Sunnyskyguy EE75Tony Stewart Sunnyskyguy EE75

            83.1k2 gold badges31 silver badges122 bronze badges




            83.1k2 gold badges31 silver badges122 bronze badges


























                4

















                $begingroup$

                Either they had different ESR ratings, as @hacktastical suggests, or the bigger ones are just an older design and/or the board manufacturer buys whatever is cheaper at the moment, then throws them into one bin. Cap manufacturers are getting better at making smaller caps, they're getting better at reducing manufacturing variations so that they can consistently hit ratings with not-quite-as-good caps, and some of them just plain lie.






                share|improve this answer










                $endgroup$














                • $begingroup$
                  If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
                  $endgroup$
                  – supercat
                  Sep 8 at 18:49















                4

















                $begingroup$

                Either they had different ESR ratings, as @hacktastical suggests, or the bigger ones are just an older design and/or the board manufacturer buys whatever is cheaper at the moment, then throws them into one bin. Cap manufacturers are getting better at making smaller caps, they're getting better at reducing manufacturing variations so that they can consistently hit ratings with not-quite-as-good caps, and some of them just plain lie.






                share|improve this answer










                $endgroup$














                • $begingroup$
                  If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
                  $endgroup$
                  – supercat
                  Sep 8 at 18:49













                4















                4











                4







                $begingroup$

                Either they had different ESR ratings, as @hacktastical suggests, or the bigger ones are just an older design and/or the board manufacturer buys whatever is cheaper at the moment, then throws them into one bin. Cap manufacturers are getting better at making smaller caps, they're getting better at reducing manufacturing variations so that they can consistently hit ratings with not-quite-as-good caps, and some of them just plain lie.






                share|improve this answer










                $endgroup$



                Either they had different ESR ratings, as @hacktastical suggests, or the bigger ones are just an older design and/or the board manufacturer buys whatever is cheaper at the moment, then throws them into one bin. Cap manufacturers are getting better at making smaller caps, they're getting better at reducing manufacturing variations so that they can consistently hit ratings with not-quite-as-good caps, and some of them just plain lie.







                share|improve this answer













                share|improve this answer




                share|improve this answer










                answered Sep 7 at 18:01









                TimWescottTimWescott

                16.2k1 gold badge16 silver badges31 bronze badges




                16.2k1 gold badge16 silver badges31 bronze badges














                • $begingroup$
                  If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
                  $endgroup$
                  – supercat
                  Sep 8 at 18:49
















                • $begingroup$
                  If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
                  $endgroup$
                  – supercat
                  Sep 8 at 18:49















                $begingroup$
                If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
                $endgroup$
                – supercat
                Sep 8 at 18:49




                $begingroup$
                If one needs to make caps with a 100uF +80%/-20% specification, one might meet that specification by trying to make 130uF caps and having them all fall within spec, or trying to make 110uF caps and rejecting a small percentage whose capacitance is too low, or trying to make 90uF caps and rejecting a higher percentage. The amount of space needed for a "130ish" cap may be larger than for a "90ish" cap, while the relative prices may vary depending upon yields.
                $endgroup$
                – supercat
                Sep 8 at 18:49











                2

















                $begingroup$

                The relatively larger caps were likely to be a low ESR type, perhaps also with a higher thermal rating. That has some influence on the size/density.






                share|improve this answer










                $endgroup$



















                  2

















                  $begingroup$

                  The relatively larger caps were likely to be a low ESR type, perhaps also with a higher thermal rating. That has some influence on the size/density.






                  share|improve this answer










                  $endgroup$

















                    2















                    2











                    2







                    $begingroup$

                    The relatively larger caps were likely to be a low ESR type, perhaps also with a higher thermal rating. That has some influence on the size/density.






                    share|improve this answer










                    $endgroup$



                    The relatively larger caps were likely to be a low ESR type, perhaps also with a higher thermal rating. That has some influence on the size/density.







                    share|improve this answer













                    share|improve this answer




                    share|improve this answer










                    answered Sep 7 at 17:38









                    hacktasticalhacktastical

                    5,6845 silver badges23 bronze badges




                    5,6845 silver badges23 bronze badges
























                        1

















                        $begingroup$

                        More advanced etching processes can increase surface area of foils, allowing higher capacitance in smaller packages.






                        share|improve this answer










                        $endgroup$



















                          1

















                          $begingroup$

                          More advanced etching processes can increase surface area of foils, allowing higher capacitance in smaller packages.






                          share|improve this answer










                          $endgroup$

















                            1















                            1











                            1







                            $begingroup$

                            More advanced etching processes can increase surface area of foils, allowing higher capacitance in smaller packages.






                            share|improve this answer










                            $endgroup$



                            More advanced etching processes can increase surface area of foils, allowing higher capacitance in smaller packages.







                            share|improve this answer













                            share|improve this answer




                            share|improve this answer










                            answered Sep 9 at 1:42









                            RandymanRandyman

                            111 bronze badge




                            111 bronze badge































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