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Hi all,

I'm reverse engineering a circuit board and not sure how to read the capacitors. The first one reads "047Z 25V", the second "1.0 25". Pictures are below. I think the second is 1uF 25V? The first is more confusing because it has three digits, the third one as I read somewhere supposed to be the multiplier, but multiplier 7 is not defined. Is it 0.47pF?

Any input is appreciated!

Tags: capacitors, ceramic, disc, tantalum

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When a capacitor value is written on a component with a decimal point, you can generally assume that the value is in microFarads.  Without the decimal point, 7 would be a multiplier and 0 would be the first significant digit, which makes no sense.  Oh, and by the way, your .047 microFarad capacitor is a ceramic disc type capacitor.

Now lets look at the second capacitor.  Notice that the circuit board has a plus sign next to one of the legs.  This then would have to be a polarized capacitor.  The two most common types of polarized capacitors are electrolytic and tantalum. Both electrolytic and tantalum capacitors generally have their values written on them in microfarads.  This capacitor is a tantalum which you can usually recognize because of it's somewhat teardrop shape and small size.  You are correct.  It's value is 1 microFarad and is rated at 25 volts.

Click here for detailed information on reading capacitor values.


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