221 capacitor: 220 pF
A capacitor marked 221 has a capacitance of 220 pF. The first two digits (22) are the value in picofarads and the last digit (1) is the number of zeros to add.
221 in every unit
| Picofarads | 220 pF |
|---|---|
| Nanofarads | 0.22 nF |
| Microfarads | 0.00022 µF |
| Farads | 2.2 × 10^-10 |
How to read 221
- Take the first two digits: 22.
- Add 1 zero: 220 pF.
- Convert: 220 pF ÷ 1,000 = 0.22 nF; ÷ 1,000,000 = 0.00022 µF.
With tolerance and voltage letters
| Marking | Meaning |
|---|---|
221J | 220 pF, ±5% |
221K | 220 pF, ±10% |
221M | 220 pF, ±20% |
1H221K | 50 V, 220 pF, ±10% |
2A221J | 100 V, 220 pF, ±5% |
Typical uses
220 pF capacitors are used in RC filters, snubbers and to shape the edges of signals.
Related codes
FAQ
What is the value of a 221 capacitor?
220 pF: 22 × 10^1 pF = 220 pF.
What does 221J, 221K or 221M mean?
The letter is the tolerance: J = ±5%, K = ±10%, M = ±20%. The value is still 220 pF.
Can I replace a 221 capacitor with a different type?
Usually, if the capacitance, voltage rating and temperature characteristic are at least as good. Check the rated voltage, and remember ceramic capacitors lose capacitance at high DC voltage.
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