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Electronics

Value series CMS resistors

image of a CMS resistor

SMD resistors marking

Up to Package (0603)

SMD resistors are marked with a three or four digit numeric code.

  • With three-digit marking, the first two represent the value, the third is the power multiplier of ten; for values ​​less than 10 the position of the decimal separator is represented by the letter R.
  • With the four-digit marking, the first three represent the value, the fourth is the power multiplier of ten; for values ​​less than 100 the position of the decimal separator is represented by the letter R.
Examples
Value3 digits4 digits
0.01 ohm R01 0R01
0.22 ohm R22 0R22
1.5 ohm 1R5 1R50
15 ohms 150 15R0
100 ohms 101 100R
4.7 kilohms 472 4701
12 megohms 126 1205

 

Package (0603)

There is another type of marking, called "EIA-96". It uses two digits for the value and one letter for the multiplier, according to the matches below.

Value :

 01 = 100 13 = 133 25 = 178 37 = 237 49 = 316 61 = 422 73 = 562 85 = 750 
 02 = 102 14 = 137 26 = 182 38 = 243 50 = 324 62 = 432 74 = 576 86 = 768 
 03 = 105 15 = 140 27 = 187 39 = 249 51 = 332 63 = 442 75 = 590 87 = 787 
 04 = 107 16 = 143 28 = 191 40 = 255 52 = 340 64 = 453 76 = 604 88 = 806 
 05 = 110 17 = 147 29 = 196 41 = 261 53 = 348 65 = 464 77 = 619 89 = 825 
 06 = 113 18 = 150 30 = 200 42 = 267 54 = 357 66 = 475 78 = 634 90 = 845 
 07 = 115 19 = 154 31 = 205 43 = 274 55 = 365 67 = 487 79 = 649 91 = 866 
 08 = 118 20 = 158 32 = 210 44 = 280 56 = 374 68 = 499 80 = 665 92 = 887 
 09 = 121 21 = 162 33 = 215 45 = 287 57 = 383 69 = 511 81 = 681 93 = 909 
 10 = 124 22 = 165 34 = 221 46 = 294 58 = 392 70 = 523 82 = 698 94 = 931 
 11 = 127 23 = 169 35 = 226 47 = 301 59 = 402 71 = 536 83 = 715 95 = 953 
 12 = 130 24 = 174 36 = 232 48 = 309 60 = 412 72 = 549 84 = 732 96 = 976 

Multiplier:

 Y or S = 0.01 X or R = 0.1 A = 1 B = 10 C = 100 D = 1,000 E = 10,000 F = 100,000

Example of marking:

image of a CMS resistor

Marking "205" translates to 20 * 10⁵ = 2 MΩ

Power

To know the approximate wattage of your SMD resistor, measure its length and width. Some dimensions of commonly used packages with the corresponding typical powers are shown in the table below. Use this table as a guide only, and always consult the component datasheet for the exact value. SMD resistor dimensions

PackageSize in inches (L × W)Size in mm (L × W)Power
0201 0.024 "× 0.012" 0.6 mm × 0.3 mm 1 / 20W
0402 0.04 "× 0.02" 1.0 mm × 0.5 mm 1 / 16W
0603 0.063 "× 0.031" 1.6 mm × 0.8 mm 1 / 16W
0805 0.08 "× 0.05" 2.0 mm × 1.25 mm 1 / 10W
1206 0.126 "× 0.063" 3.2 mm × 1.6 mm 1 / 8W
1210 0.126 "× 0.10" 3.2 mm × 2.5 mm 1 / 4W
1812 0.18 "× 0.12" 4.5 mm x 3.2 mm 1 / 3W
2010 0.20 "× 0.10" 5.0 mm × 2.5 mm 1 / 2W
2512 0.25 "× 0.12" 6.35 mm × 3.2 mm 1W

For more information ...


Content subject to CC-BY-SA license .
Source : Article Resistance (Component) from Wikipedia in French

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