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Capacitors, and stability when cold.

M

maluckey

Platinum Member
I was just wondering......

Do capacitors lose current when dropped in temperature to thier lowest rating? After all, car batteries lose current, and a capacitor acts in many ways like a short term storage battery. If so, do they perform better (within rated temperature range) as they get hotter?

Just wondering...I got unexpected results from a hardware test done at hot, and cold temperatures, and the most likely culprit was the capacitors.

I just got a PM stating that they are rated less at colder temps. I will check out the link...Thanks!

Cap info
 
It depends on the dielectric, some capacitors will change their value by orders of magnitude when cooled; others are more or less stable.

You also need to define what you mean by "cool", I use standard capactors at 700 mK and they work very well (in filters); however, we have also tried some other types and their values droped to almost nothing. In my experience most ceramic capacitors work well down to 77K, below that you need to be carefull.


 
Thier temps were at 10c, so that's only -15C from the rated temps. I did nbote stability issues.

They link sent to me right after posting (thanks) was informative.

f95toli,

Which caps are best suited for temperature indifference? I run extremes of temps in many uses, and have begun to notice either rapid decay (capacitance/response/ripple, or shortened shelf life in some apps, as compared to inside temperature controlled use.
 
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