The same value, written every way
| 3-digit code | 331 |
|---|---|
| IEC code | 330p |
| Picofarads | 330 pF |
| Nanofarads | 0.33 nF |
| Microfarads | 0.00033 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 |
|---|---|
| 331J | 330 pF, ± 5 % |
| 331K | 330 pF, ± 10 % |
| 331M | 330 pF, ± 20 % |
| 331Z | 330 pF, +80 / −20 % |
| 2A331J | 330 pF, ± 5 %, rated 100 V |
| 1H331K | 330 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 331 capacitor?
A capacitor marked 331 is 330 pF: 33 followed by one zero in picofarads, 330 pF, which is also 0.33 nF = 0.00033 µF.
What is 331 in µF and nF?
331 = 330 pF = 0.33 nF = 0.00033 µF.
What do 331J, 331K and 331M mean?
The same capacitance, 330 pF, with a tolerance of ± 5 % (J), ± 10 % (K) or ± 20 % (M).
Other common codes
101 151 221 330 332 333 334 471 681
Code system: EIA three-digit capacitance code and IEC 60062 tolerance letters.