Part Numbering System for ceramic and mylar capacitors - Electronic Circuits Projects Diagrams Free

marvz · 14th January 2009, 01:33 AM

Hello,

someone there who can help where to find a reference for part numbering system for capacitors especially for ceramic and mylar cap.

Pommie · 14th January 2009, 01:54 AM

If they have 3 numbers then the first 2 are the first 2 digits of the value and the last is the number of zeros to add. So, 474 would be 470,000 pF = 0.47uF.

Mike.

transistor495 · 14th January 2009, 02:07 AM

Part number conversion chart:

Capacitance Conversion Chart - Vintage Radio and Electronics

marvz · 14th January 2009, 05:57 AM

Quote:

Originally Posted by Pommie

If they have 3 numbers then the first 2 are the first 2 digits of the value and the last is the number of zeros to add. So, 474 would be 470,000 pF = 0.47uF.

Mike.

yes that is true for capacitance value, how about the working voltage on it, some capacitors marked with 2A104J in which 2A stands for working voltage of 100 volts, 104 is the capacitance value, J is the tolerance. if the capacitor marked only with 220Pf? how to find out the working voltage on it.

chrisjpitt · 14th January 2009, 01:06 PM

Quote:

Originally Posted by marvz

yes that is true for capacitance value, how about the working voltage on it, some capacitors marked with 2A104J in which 2A stands for working voltage of 100 volts, 104 is the capacitance value, J is the tolerance. if the capacitor marked only with 220Pf? how to find out the working voltage on it.

Measure the voltage that is applied in the circuit and use the next voltage range up from that?

In reality, if the cap is not marked, you won’t know it’s rated voltage – possibly its size (for a given value) will be an indication of voltage rating (higher voltage, thicker dielectric).

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14th January 2009, 01:33 AM	#1 (permalink)
marvz	Part Numbering System for ceramic and mylar capacitors Hello, someone there who can help where to find a reference for part numbering system for capacitors especially for ceramic and mylar cap.

14th January 2009, 01:54 AM	#2 (permalink)
Pommie	If they have 3 numbers then the first 2 are the first 2 digits of the value and the last is the number of zeros to add. So, 474 would be 470,000 pF = 0.47uF. Mike.

14th January 2009, 02:07 AM	#3 (permalink)
transistor495	Part number conversion chart: Capacitance Conversion Chart - Vintage Radio and Electronics