Digital cable a nominal method

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Method of identifying resistance

The chip component has small volume, light weight, high installation density and strong shock resistance. Strong anti-interference ability, high frequency characteristics, etc., widely used in computers, mobile phones, electronic dictionaries, medical electronics, camcorders, electronic watt-hour meters and VCD machines. Patch components can be divided into three types according to their shape: rectangular, cylindrical and shaped [2]. There are resistors, capacitors, inductors, transistors, and small integrated circuits, depending on the type. SMD components differ from the nominal methods of general components.

The following mainly talk about the nominal value of the resistance of the chip resistor:

The resistance of the chip resistor is the same as that of a general resistor and is indicated on the resistor body. There are three types of resistance nominal methods, but the nominal method is not exactly the same as a general resistor.

Digital cable nominal method

(General rectangular chip resistors use this nominal method)

The digital cable nominal method uses three digits on the resistor to indicate its resistance. Its first and second digits are significant digits, and the third digit indicates the number of "0"s added after the significant digit. This one does not appear letters.

For example: "472'' means "4700Ω"; "151" means "150Ω". If it is a decimal, use "R" to mean "decimal point". It takes up a valid digit and the remaining two digits are significant digits.

For example: "2R4" means "2.4 Ω"; "R15" means "0.15 Ω".

Color ring nominal method

(General cylindrical fixed resistors use this nominal method)

The chip resistors are the same as the general resistors, and most of them use four rings (sometimes three rings) to indicate their resistance. The first ring and the second ring are significant figures, and the third ring is the magnification (color ring code is shown in Table 1). For example: “brown green black” means “15Ω”; “blue gray orange silver” means “68kΩ” error ±10%.

E96 digital code and letter mixed nominal method

The digital code and letter mixed nominal method also uses three digits to indicate the resistance value, that is, "two digits plus one letter", and the two digits represent the E96 series resistance schedule 2. Its third digit is the magnification expressed in alphabetic code (see Table 3). For example: "51D" means "332 × 103; 332kΩ"; "249Y" means "249 × 10-2; 2.49".

material

Metal film, alloy, etc.