Component labeling and identification
(unofficial)

This is the way I identify most resistors and capacitors. It is similar to the European/British nomenclature for schematics.

The goal is to identify most common passive components using only three digits. This not only simplifies schematics, but upon multi- generational copies of schematics, the decimal point could be lost or added because of dirty copier lenses or glass.

Simply, the decimal point is replaced with the unit multiplier/identifier.

The "R", "K" and "M" denote resistors. "R" for units of resistance, "K" for thousands of ohms, and "M" for millions of ohms.

The "N", "P" and "U" denote capacitors. "N" for nano farads, "P" for pico farads, and the "U" for micro farads. Unofficially, the "F" can be used to identify farads within certain limits.

Unofficially, the "Z" or the "V" can denote zener diodes.

Below are some examples of component identification:

4K7    4.7K or 4,700 ohms

12R    12 ohms

R33    0.33 ohms

M56    560,000 ohms

K12    120 ohms

82K    82,000 ohms

2M2    2,200,000 ohms

10M    10,000,000 ohms

1R5    1.5 ohms

N10 (or 0N1) =  100 pf

1U0    1 uf

3P3    3.3 pf

15P    15 pf

P47    0.47 pf

1P5    1.5pf

1N5    .0015uf

1N0    .001uf or 1000pf

10U    10 mf

U33    0.33 uf

F10    0.1 farads or 100,000 uf

3N3    0.0033 uf

20N    0.02 uf

5Z1    5.1 volt zener or,
5V1    5.1 volt zener