In the morning, Xiaobo woke up early and had breakfast with Shenzhen's most famous intestinal powder. Later, he arrived at the company's flexible circuit board SMT production line. Before he could fully reach the production line, he was chased by office fans who were shouting for questions (Xiaobo has recently become a well-known encyclopedia in our company). Startled, Xiaobo quickly shared the flexible circuit board SMT resistor packaging and silk screen printing materials he had obtained from his senior brother Wang a few days ago, which allowed him to escape..........
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Packaging dimensions and silk screen labeling of surface mount resistors

One Chip resistor packaging and size correspondence table
From the table, you can find the relevant parameters of the chip resistor for the corresponding package, such as length, width, height, rated power, and maximum operating voltage.

II Silk screen marking of surface mount resistors
1. Three digit notation method

For example, common 103, the first two digits represent significant figures, and the third digit represents the power exponent of 10 in Scientific notation, with the general precision of ± 5% (J), ± 2% (G), and the unit is Ω. The calculation formula is as follows: ABC=AB * 10^CThe resistance value of the surface mount resistor represented by 103 is 10 * 10³

2. Four digit notation method

The 4-digit labeling method consists of four digits, with an accuracy of ± 1% for general resistors. The first three digits are significant figures, and the fourth digit represents the power exponent of 10 in Scientific notation, with the unit of Ω. The calculation formula is as follows: ABCD=ABC * 10^DThe 1502 in the above figure is a 15K Ω surface mount resistor

3. Numerical and Alphabet Annotation Method
1> Letters represent decimal point positions

The method of representing the decimal point position with R is composed of numbers and letters. Here, simply replace R with the decimal point, for example: 5R6=5.6 Ω, R16=0.16 Ω;

The letters M, k, R, and m can all be used to represent decimal points. When the unit is m Ω, m represents the decimal point position, for example, 5m1=5.1m Ω. This labeling method is relatively rare. Generally, m Ω level resistors have high accuracy, so the packaging size of surface mount resistors is relatively large, and the resistance values are directly screen printed on them, such as 10m Ω, 20m Ω, etc.

2> Three digit multiplier code annotation method

This method is to represent numbers with code. Silk screen printing is a resistor consisting of two numbers and a letter, usually a precision resistor. This type of precision chip resistor encodes a priority number and then uses the code to find the value it represents. The corresponding code query table is as follows:

The calculation method for the resistance value of 01C in the above figure is:
According to Table 1, 01 corresponds to a resistance value of 100. According to Table 2, C corresponds to a multiplier of 10 ^ 2, which is 100. Therefore, 01C represents a resistance value of 100 * 100=10K Ω.
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Original link:https://blog.csdn.net/xiaopikadi/article/details/9762851