Polyester capacitor parameter identification and labeling method

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Polyester capacitor parameter identification and labeling method

Parameter identification

Foreign capacitor withstand voltage values are usually expressed in letters, and the common code and cardinality are:

A: 1.0; B: 1.25; C: 1.6; D: 2.0; E: 2.5; F: 3.15; G4.0;

H: 5.0; J: 6.3; K: 8.0; Z: 9.0;

The number preceding the letter indicates a power of 10, such as 2A, which is 102*1.0=100V, 2C is 102*1.6=160V, and so on.

The letter after the withstand voltage indicates the capacitance capacity in pF.

For example, 823 indicates a capacity of 82*10^3=82000Pf, 224 indicates 22*104=220000pf=0.22μF; the last letter indicates accuracy, such as J indicates a capacity tolerance of ±5% and the like.

Typical example of capacitance identification: 2A823J is 82000Pf ± 5%, withstand voltage 100V [1].

Parameter labeling method

Straight standard method

The main parameters of the capacitor (nominal capacity, rated voltage, and allowable deviation) are directly marked on the capacitor, such as 0.0047μf / 275V, 0.0047μf is the capacity, equivalent to 4700Pf, 275V should be withstand voltage (not preferred series) .

Text notation

The main parameters of the capacitor are labeled by a number or a mixture of letters and numbers.

1. Digital notation Generally, the capacity of a capacitor is represented by a 3-digit number. The first two digits are the rms digits, and the third digit is the multiplier (ie, how many zeros are there after the rms value). For example, 104 indicates that the effective value is 10, followed by four zeros, that is, 100000 Pf=0.1 μf.

2. Mixed combination of letters and numbers Use 2-4 digits to represent the effective value, and use P, n, M, μ, G, m and other letters to indicate the magnitude after the significant digit. Imported capacitors do not use a decimal point when marking values, but write the integer part before the letter and the decimal part after the letter. For example, 4P7 represents 4.7Pf, and 3m3 represents 3300μf (3.3mf) or the like.