inductance. Code marking. Reference data
Encyclopedia of radio electronics and electrical engineering / Reference materials
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Usually, for inductors, the nominal value of the inductance and the tolerance are encoded, i.e. allowable deviation from the specified face value. The nominal value is encoded in numbers, and the tolerance is encoded in letters.
Two types of coding are used.
А. The first two digits indicate the value in microhenry (µH, uH), the last - the number of zeros. The letter following the numbers indicates the tolerance. For example, code 101J means 100 µH ±5%. If the last letter is not specified, the tolerance is 20%. Exceptions: for inductances less than 10 µH, the decimal point is the letter R, and for inductances less than 1 µH, the letter N.
Tolerance: D = ±0.3 nH; J = ±5%; K = ±10%; M = ±20%
Designation examples:
В. Inductances are marked directly in microhenries (µH, uN). In such cases, the marking 680K will not mean 68 µH ± 10%, as in case A, but 680 µH ± 10%.
Publication: cxem.net
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