Identification method of tantalum capacitor

(1) Direct marking method: Use the letters and numbers to directly mark the model and specifications on the shell.

(2) Letter symbol method: Use a regular combination of numbers and letter symbols to represent capacity. The text symbol indicates the unit of its capacitance: P, N, u, m, F, etc. The method is the same as that of resistance. The nominal allowable deviation is also the same as that of resistance. For capacitors less than 10pF, the allowable deviation is replaced by letters: B-- ± 0.1pF, C-- ± 0.2pF, D-- ± 0.5pF, F-- ± 1pF.

(3) Color scale method: It is the same as the resistance expression, and the unit is generally pF. The withstand voltage of small electrolytic capacitors is also color-coded, and is located near the root of the positive lead. The meaning is shown in the following table:

Color Black Brown Red Orange Yellow Green Blue Purple Grey

Withstand voltage 4V 6.3V 10V 16V 25V 32V 40V 50V 63V

(4) Identification method of imported capacitors: Generally, imported capacitors are composed of 6 items.

First item: Letters for categories:

The second item: use two digits to indicate its shape, structure, packaging method, lead start and relationship with the shaft.

The third item: the temperature characteristics of temperature-compensated capacitors, with letters and colors, the meaning is shown in the following table:

No. Letter Color Temperature Coefficient Allowed Deviation Letter Color Temperature Coefficient Allowed Deviation

1 A gold +100 R yellow -220

2 B gray +30 S green -330

11 P Orange -150 YN -800 ~ -5800

Note: The unit of temperature coefficient is 10e -6 / ℃; the allowable deviation is%.

The fourth term: use the numbers and letters to indicate the withstand voltage, the letters represent valid values, and the numbers represent the power of 10 of the multiplicand.

The fifth item: Nominal capacity, expressed by three digits, the first two are valid values, and the third is a power of ten. When there is a decimal, it is represented by R or P. The unit of ordinary capacitor is pF, and the unit of electrolytic capacitor is uF.

The sixth item: allowable deviation. Expressed by a letter, the meaning is the same as domestic capacitors.

The color coding method is also used, the meaning is the same as that of domestic capacitors.

For imports, take 477 A71N13 as an example, the next six digits respectively correspond to the above six items