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dennis_elx33 05-09-2019 06:31 PM

Unidentified Capacitor
1 Attachment(s)
Hi Guys,

I am an electronics tech repairing power supply and other elex devices. It happened that I repaired 1 lambda power supply and found 1 capacitor burnt. I compared it with 1 good unit and was able to get the top marking of it. But the problem is, I cannot find any information/datasheet of the said capacitor online. I tried to source and ask electronic store online like digikey but all got negative response as they cannot find any info about it also. I tried to measure the good cap from other unit and it measures 220nF on board. The top marking is AVX CDM-22-0169744A. I hope you guys can give any info/suggestions on what capacitor should I use to replace this. Thank you in advance!

stj 05-10-2019 02:39 AM

Re: Unidentified Capacitor
most likely CDM-22-016 is the part number and the last line is the date it was made.
given your checking of the other one, it may even be:

CDM = range
.22 = capacitance
.016 = voltage (160v??)

dennis_elx33 05-10-2019 06:31 AM

Re: Unidentified Capacitor
Hi Stj! Thank you very much for the idea. Having said that, do you think i can use any ordinary ceramic capacitor to replace this one? It seems that this cap got special characteristic because the packaging type (8-pin DIP package) is not same with any ordinary caps. Though i don't have any datasheet to confirm. Hope to hear from you again. Thanks in advance!

stj 05-10-2019 11:17 AM

Re: Unidentified Capacitor

this is just big.

R_J 05-10-2019 01:41 PM

Re: Unidentified Capacitor
What part of the circuit is it located?
That might be either an old number or custom part number.
You say the value you measured is .220 f correct?

If you can't find a replacement, try contacting AVX, they likely have a direct replacement

R_J 05-10-2019 04:24 PM

Re: Unidentified Capacitor
It could just be a very low esr capacitor that is used in the output of the power supply, I see they will use these stacked mlcc types in place of large electrolytics

dennis_elx33 05-10-2019 06:10 PM

Re: Unidentified Capacitor
Hi Stg, thanks for the reply..i will just try to find other options.

dennis_elx33 05-10-2019 06:23 PM

Re: Unidentified Capacitor
1 Attachment(s)
Hi RJ,

Kindly see the actual photo of the pcb circuit. Yes, I will try to contact AVX about this. Its 220nF so by conversion its 0.22uF. Thank you very much for the suggestions.

R_J 05-10-2019 10:02 PM

Re: Unidentified Capacitor
1 Attachment(s)
I suspect it is the high voltage type.

dennis_elx33 05-10-2019 11:48 PM

Re: Unidentified Capacitor
Hi RJ, Thank you very much for your idea and for this datasheet. Anyway, I already sent email to AVX and still waiting for their reply. I will update you the result later. Thanks again!

stj 05-11-2019 02:15 AM

Re: Unidentified Capacitor

what is this? maybe we can find a schematic.

dennis_elx33 05-11-2019 02:48 AM

Re: Unidentified Capacitor
Hello stj! Yes, this is lambda power supply. Thanks in advance.

stj 05-11-2019 07:58 AM

Re: Unidentified Capacitor

R_J 05-11-2019 10:07 AM

Re: Unidentified Capacitor
Someone was looking for the same part but a different power supply a few years ago (HAL-02-655), I suspect the number is lambda's own number on that part.

dennis_elx33 05-12-2019 10:15 PM

Re: Unidentified Capacitor
Hi Stj, the model is pfhc-2600..thanks

dennis_elx33 05-12-2019 10:17 PM

Re: Unidentified Capacitor
Hi RJ, I guess so..I'm still waiting for AVX's reply on my inquiry email. Still hoping they will reply by this week.

R_J 05-13-2019 09:21 AM

Re: Unidentified Capacitor
1 Attachment(s)
If you don't here from AVX, try TDK-Lambda, they might be able to supply the part.
Here is the other picture I found, same numbers except the last which I suspect is the date/mfg. code.

dennis_elx33 05-13-2019 06:33 PM

Re: Unidentified Capacitor
Hi RJ, ok I will try your suggestion. Thanks a lot!

stj 05-14-2019 01:55 AM

Re: Unidentified Capacitor
yes, good photo.

last line on the cap: 9726A < 26th week of 1997??
printed on the pcb: 3197 < 31st week of 1997??

dennis cap is 9744A and the pcb is 9825.

i am now 100% sure i was right.
the capacitance, possibly the voltage, then the mfr date.

dennis_elx33 05-15-2019 01:52 AM

Re: Unidentified Capacitor
hi stj, thanks for your idea..anyway I tried to buy the mlcc cap with 220nF/630V rating because I cannot find the exact part online.. I will inform u guys later whether pass or fail after I install the part and do the testing.:)

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