How to mark milliohm level chip resistors

Generally, small resistors are marked like this:

r002r010

0m500m75

1m50 your 2 should be 2 euros.

Is that resistor connected in series in the main circuit of the power supply? I don't know what it does. Not a chip rectifier or a chip inductor or something?

To confirm that it is a resistor, probably a resistor for current sampling, it may be used to monitor the battery level, and the m resistance of 0805 and 0603 should be marked like that, maybe it is expedient that 0402 is not marked for such a long time. In general, such components are rarely used for personal repair. Most of them are used in production lines, as long as the marking on the packaging tray is clear.

1. Milliohm resistors are generally divided into plug-in resistors and chip resistors according to the requirements of specific circuit boards. Milliohm resistance, low resistance, high precision, generally in the resistance precision within 1%, higher requirements of the use will use precision resistance.

2. The surface of the chip resistor is represented by three digits, in which the first and second digits are significant digits, and the third digit indicates the number of zeros after it. Used when there is a decimal point"r"and occupy one significant digit. Generally, milliohm resistance uses r to represent the decimal point in the ohmic range, and m to represent the decimal point in the milliohm range, for example:

r002--

r010--

0m50 ；

0m75 ；

1m50--

SMD resistorsThe identification and model number are as follows:

1. Color: ceramic chip capacitor.

The color of the surface body is generally yellow. On the other hand, the body color of the chip resistor is black (the body of the alloy chip resistor is metal, but there are also other colors, such as green).

The marking is generally three or four digits, which means resistance**, the first 2 or the first three digits are significant digits, and the last digit is the number of zeros after the significant digits.

3. Specification size: Although 1210 and other smaller specification sizes.

All are the same, but 1210 and above are not the same, and the chip capacitors are available in richer specifications and sizes, such as (7690). However, there are only two types of SMD resistors, such as 2010 and 2512.

Related to the Confession of Lee

Consists of three numbers that indicate the error of the resistor by 5. The first two digits are significant figures, and the third digit represents the multiplier multiplier by zero, the base unit.

Be. For example, 103, 1 and 0 are significant figures, and 2 is multiplied by zero, which is the power of 10.

To put it simply, the third digit is a few, which is a few times square of 10). So the resistance value represented by 103 is 10 to the third power of 10 = 10 1000 = 10000 = 10k.

01a：100ω

01b：1000ω

01c：10000ω

01d：100000ω

01 represents 100, and a, b, c, and d are to the power of 0, 1, 2, and 3 of 10 respectively. So 01b=100 10=100

This method is called the e96 numeric ** mixed letter nominal method.

The numeric ** and alphabetic mixed nominal method also uses three digits to indicate the resistance value, that is, "two digits plus one letter", where the two digits represent the E96 series resistors Schedule 2. Its third digit is the magnification indicated by the letter **. For example:

51d" means "332 10 3;332kω”；249y" means "249 10 -2;"。

Summary. Chip resistors are available in a variety of different options, including different power classes (e.g., 1 8 watts, 1 4 watts, 1 2 watts), a variety of common sizes (e.g., ), and different accuracy requirements (e.g., %) for different materials and operating temperature ranges.

There are many types of chip resistors in ohms. Common ones include resistors of power levels such as 1 8 watts, 1 4 watts, 1 2 watts, etc. In addition, there are options for different sizes and accuracy, such as common patch sizes such as , and different accuracy requirements such as %.

In addition, the round keys are available in a variety of materials, materials, and operating temperature ranges.

Fellow, I really didn't understand, I can be more specific.

Chip resistors are available in a variety of different power levels (e.g., 1 8 watts, 1 4 watts, 1 2 watts), in a variety of common sizes (e.g., 1 μs), and with different accuracy requirements (e.g., 1%, 5% at Hermen), suitable for different materials and operating temperature ranges.

01a represents that the resistance value should be 100 1=100; 01b means that the resistance value should be 100x10=1000 (i.e. 1k); 01c means that the resistance value should be 00x100=10000 (i.e. 10k).

This is the letter representation on the chip resistor. 01** is known to be 100 after checking the table, ** the letter A is known to be 10 to the zero power (i.e. 1) after checking the table.

The 5% series chip resistors are represented by 3 characters: the first two digits of this representation method represent the significant digits of the resistance value, and the third digit of the age cherry fiber indicates the number of "0" that should be added after the significant digits. When the resistance is less than 10, r is used in ** to indicate the position of the decimal point of the resistance value, which is similar to this notation usually used in the resistance value error of 5% resistance series.

The chip resistor package is 01005, 0201, 0402 because the resistor body is too small, so the body is not marked with a font code; Therefore, the chip resistance of these packages can only be distinguished by a multimeter.

1. The 5% tolerance resistance code of the chip resistance is three digits, the first two digits are the significant numbers of the resistance value, and the third digit indicates that there are several 0s.

2. SMD resistor package 0805, 1206, 1210, 2010, 2512 1% tolerance product code has four digits, the first three digits are the significant digits of the resistance, and the fourth digit indicates that there are several 0s.

3. SMD resistor package 0603 1% tolerance E-96 series standard resistance, because the resistance body is too small, the three-digit resistance value ** (number) and the following index ** (letter) are used to indicate the standard resistance value.

Index code (0603 1% indication).

**：a--b--c--d--e--f--g--h--x--y--z

Index: 100--101--102--103--104--105--106---107--10-1--10-2--10-3

Resistance identification method of chip resistor:

1) 2 digits followed by a letter notation: the first two digits of this method indicate the significant value of the resistance value, and the following letters indicate how many powers of the effective value should be multiplied by 10, unitThe significance of its logo is shown in the figure below.

For example, 02c is 102 102=, and 27e is 187 104=

2) 3-digit notation: The first two digits of this notation represent the significant digits of the resistance value, and the third digit indicates the number of "0" that should be added after the significant digits. When the resistance is less than 10, the position of the decimal point of the resistance value is indicated by r in **, and this notation is usually used in the resistance series with a resistance error of 5%.

For example, 330 means 33, not 330; 221 means 220; 683 means 68000, i.e. 68k; 105 means 1m; 6r2 means 602.

3) 4-digit notation, the first 3 digits of this notation represent the significant digits of the resistance value, and the 4th digit indicates the number of 0s that should be added after the significant digits. When the resistance is less than 10, the position of the decimal point of the resistance value is still represented by r in **, and this representation method is generally used in the precision resistance series with a resistance value error of 1%. For example:

0100 means 10 instead of 100; 1000 means 100 instead of 1000; 4992 means 49900, ie; 1473 means 147000, i.e. 147k; 0r56.

300 is 30 euros (this is the international standard).

30R is 30 euros (this is the British standard).

I often look at the circuit diagrams drawn abroad, and the United States, the United Kingdom, and Japan have different marks on the symbols of the parts. However, the indication of the resistance value gradually converges, because that point often goes wrong. Therefore, the indication discussed in this article is not the color code recognition, but the indication on the part value table.

RP23, RP22, resistance 104, is 100K ohm RP20, RP21, resistance 101, is 100 ohm connection, directly from the left to connect on the line is one is one is one is one.

The drawing method in the diagram is just to draw the four resistors together, and the actual corresponding ones are also four electrically independent resistors, but they are physically encapsulated together.