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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.:)

dennis_elx33 06-07-2019 06:09 PM

Re: Unidentified Capacitor
1 Attachment(s)
hi rj and stj, I already install the capacitor X7R series MLCC capacitor to replace the obsolete AVX cap. And guess what, my PS already can power up normally and with load test pass! Thanks guys for helping me out! Cheers!!!

R_J 06-07-2019 06:17 PM

Re: Unidentified Capacitor
That's good to here, I hope it lasts, it should be ok

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