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I am trying to learn how to identify old capacitors I have. I haven't been able to crack the search "code". I tried testing with my MESR100 ESR meter with no luck. Just says OL. Help finding a site where I can research better would help.

Pictured is my latest conundrum:

enter image description here

capacitor

ocrdu
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2 Answers2

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Those are 10nF ceramic disk capacitors.

The 3 is the multiplier. The 10 is the value in picofarads.

That's 10 picofarads multiplied by 1000 (three zeroes.) That's 10000 picofarads, which is also called 10 nanofarads.

That's a pretty standard way of marking ceramic disk capacitors. If it were just two digits then the value would be picofarads only. Have a look here for a longer description.

JRE
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Why focus on the capacitor marking when there's a manufacturer (TDK) part number on the bag?

The capacitor is from the CK45 series - per the first letters of the part number.

Datasheet:

https://product.tdk.com/system/files/dam/doc/product/capacitor/ceramic/lead-disc/catalog/leaddisc_commercial_ck45_en.pdf

Kuba hasn't forgotten Monica
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    Except that the interesting parts "YV1E" which would give the temperature rating and voltage rating aren't explained in that document. – JRE Feb 10 '24 at 16:51
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    The markings show in the datasheet don't match the F 103 shown on the capacitors . E.g. all the example markings in the datasheet show the rated voltage (the CK45 series are rated as either 1 kV DC , 2 kV DC or 3 kV DC voltage). Perhaps, for confusion, someone placed some different capacitors in some random other TDK labeled bag. – Chester Gillon Feb 10 '24 at 16:54
  • I have 23 bags or 23000 of these so I believe they are labeled correctly. I just don't understand how to figure these out. How do I find voltage if they aren't marked? –  Feb 10 '24 at 18:32
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    @MikeA, dimension of the caps might give you some clue. This seems to be some 30-years-old cap. You might be better if you contact TDK directly. However, for high-voltage parts that old, no one will risk their design and buy these parts. The best way is probably just recycle all bags. – Ale..chenski Feb 10 '24 at 21:49