Author Topic: Capacitor identification help  (Read 715 times)

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Offline Lorenzo_1Topic starter

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Capacitor identification help
« on: February 23, 2021, 01:08:54 pm »
I have two main boards from APC SURT1000 double conversion UPS with faults.  Trying to identify the pictured blue capacitor marked u1J63 on one side and A(?)107 on the reverse.  Pretty sure it's 100nF 63V +/-5% but not sure of its internal composition. The second board (also pictured) has an orange capacitor marked 0.1 J 63 in the same location (C93) - which looks like the same spec.  They bridge between pin 5 on the TC4427 IC, which is a dual MOSFET driver and the pin on T6 nearest the C93 PCB mark.

 Are both of these perhaps polyester film caps?  Happy to post other board pics if that helps with identification.
 

Offline MF-jockey

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Re: Capacitor identification help
« Reply #1 on: February 24, 2021, 11:11:05 pm »
0.1 µF
J= 5%
63 V
if not sure the best type is MKP (Polypropylen)
Polyester has big ESR and tan δ
 

Offline Lorenzo_1Topic starter

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Re: Capacitor identification help
« Reply #2 on: February 25, 2021, 09:46:19 pm »
Thanks for the confirmation and guidance re type,
 


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