EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: SmallWalrus on February 03, 2012, 04:17:11 am
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Sorry for the newbie question, I figured that I probably am wrong, so I thought to post a picture of it :)
(https://lh6.googleusercontent.com/-ghGKUnD0xBg/Tytd1C1jv0I/AAAAAAAAB0M/vx1FYLHBCrI/s800/IMG_20120203_120749.jpg)
This is a 22pF capacitor right? However what does the g81 underneath it mean? And how do I find out the voltage for it?
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That looks like a tantalum capacitor (since it has a polarity marking) and is most likely 22uF. Could also be one of those fancy SMD package electrolytic ones?
g81 will be some kind of manufacturer code. Could be anything from a date/week code to tolerance specs to a batch number. Hard to tell without knowing which brand/model it is to look at the datasheet.
22picofarads would normally be much smaller, like the size of those tiny brown/beige ceramic caps.
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Thanks for your reply :)
How do I find out what voltage it is though?
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Is there some guide on how to read these codes too? I've found 2 on Google and from what they said, it does seem like "220" is a 22pF value (as much as it might not make sense).
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220 simply means 22 x 100 = 22 ... uF , pF ... up to the size of the capacitor... at that size it's more likely to be 22uF, it's too large to be pF.
821 would mean 82 x 101 = 820uF etc etc
as for the voltage... since they're near a chipset or some chip/controller etc... the voltages are probably around 0.8-1.8v so they're probably rated for 2-2.5v ... can't be sure without actually probing or without checking chips around the area (see maybe there's a switching voltage regulator and maybe you can determine the voltage based on its datasheet and surrounding parts)
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It is not possible to be pF cause it has polarity.
About the voltage, if its possible turn it on and measure it .