The same value, written every way
| 3-digit code | 221 |
|---|---|
| IEC code | 220p |
| Picofarads | 220 pF |
| Nanofarads | 0.22 nF |
| Microfarads | 0.00022 µF |
| Standard series | E6 value |
With a letter or a voltage code
The letter after the code is the tolerance, and a digit-letter pair in front of it is the rated voltage on film capacitors and some ceramics:
| Marking | Meaning |
|---|---|
| 221J | 220 pF, ± 5 % |
| 221K | 220 pF, ± 10 % |
| 221M | 220 pF, ± 20 % |
| 221Z | 220 pF, +80 / −20 % |
| 2A221J | 220 pF, ± 5 %, rated 100 V |
| 1H221K | 220 pF, ± 10 %, rated 50 V |
Where you meet it
Picofarad values are used in RF circuits, oscillators and small filters, mostly as C0G (NP0) ceramics that keep their value with temperature.
Open the capacitor code calculator →Have a letter, a voltage code or a different value? The calculator reads any marking and gives the code for any value.
Frequently asked questions
What is a 221 capacitor?
A capacitor marked 221 is 220 pF: 22 followed by one zero in picofarads, 220 pF, which is also 0.22 nF = 0.00022 µF.
What is 221 in µF and nF?
221 = 220 pF = 0.22 nF = 0.00022 µF.
What do 221J, 221K and 221M mean?
The same capacitance, 220 pF, with a tolerance of ± 5 % (J), ± 10 % (K) or ± 20 % (M).
Other common codes
101 151 220 222 223 224 225 226 331 471 681
Code system: EIA three-digit capacitance code and IEC 60062 tolerance letters.