Identifying box caps by the little numbers on top

[Bret608]

Hi everyone,

How do you read the numbers on top of our old friend the box capacitor? I've got five of them going onto a Wolfshirt board this afternoon, and want to make sure I've got it right. So I've got a specific task here, but since I'll surely use this knowledge many times after, I thought this would be the right place for the thread.

So for example, here are the numbers on the caps and what I think they mean after looking at the BOM:

104J100: 100n?
102J100: 1n?
473J100: 47n? (subbing for the 50n cap)
332J100: 3n?

Thanks in advance for the help as always!

Bret

[culturejam]

You have it right on the values.

It breaks down like this:

Value | Tolerance | Voltage Rating

104J100


104 = 100n  (10 + 4 zeroes, in picofarads)

J = 5% tolerance

100 = 100v rating


For more reading:
http://www.electronics2000.co.uk/data/itemsaf/capmarks.php

[Bret608]

I appreciate it! This site looks to be a great resource.

[Guitafuzz]

   Hi Bret this table can be useful too together with the explanion of culturejam.

   

[DutchMF]

You have it right on the values.

It breaks down like this:

Value | Tolerance | Voltage Rating

104J100


104 = 100n  (10 + 4 zeroes, in picofarads)

J = 5% tolerance

100 = 100v rating


For more reading:
http://www.electronics2000.co.uk/data/itemsaf/capmarks.php

Good stuff CJ, thanx! I knew a lot of this in bits and pieces, but seeing it like this in one concise post is always a pleasure!

Paul

[culturejam]

Here's another handy chart for converting between the various multipliers of values:
http://www.justradios.com/uFnFpF.html