Electronics > Beginners
Capacitor question??
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cvanc:
I run into this a lot when repairing older gear.  Modern electrolytics (um, we ARE talking about electrolytics here, right?) are much smaller than ones from decades ago given the same ratings.  Often buying "identical ratings" to your failed part will cause a fit problem because it's just too small to elegantly fit the board well and stand up properly.

I find a good approach is to stick with the uF value of the original part and search the catalog by increasing voltage rating until the lead spacing fits my board.  Then I have to verify the diameter and height are OK for me.  It works for me, anyway.  Good luck with your project.
6PTsocket:
It depends on the application. In high frequency circuits a Low ESR capacitor is called for. High temp circuits need caps that can handle it. In many cases like filtering AC, equal or higher capacity and voltage will work fine. If you can make the new cap fit it will often work fine. As pointed out, newer designs are often smaller.

Sent from my SM-G900V using Tapatalk

Raj:
The technology,max temperature,esr,esl and lifespan would be different for different package size.
It's like going into a rabbit hole. you'll have to read each model's datasheet to know how each will behave.
David Hess:
Ripple current rating depends on both ESR and surface area available to dissipate heat so physically smaller capacitors with the same capacitance, voltage, operating life, and ESR may not be suitable in high ripple current applications because they will operate at a higher temperature due to a higher thermal resistance to ambient shortening operating life.

The solution is often to use a replacement capacitor with a larger voltage rating to get a large physical size but in many cases, a larger capacitance can be used as well.
wadmancpu:
Exactly what I was looking for, thanks!
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