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Resistor Markings
Three methods of resistor markings are predominant - color coding, numerical value coding and three-digit symbol coding. MIL-PRF-55342 assigns part numbers using alpha-numeric coding. Tolerance, temperature, package style and failure rate are integrated into some numbering schemes.
Color Coding Color first 2nd 3rd Multiplier Tolerance Failure Rate Level None ±20% Silver 0.01 ±10% Gold 0.1 ±5% Black 0 0 0 1 Brown 1 1 1 10 ±1% M = 1.0% Red 2 2 2 100 ±2% P = 0.1% Orange 3 3 3 1000 (=1k) R = 0.01% Yellow 4 4 4 10k S = 0.001% Green 5 5 5 100k Blue 6 6 6 1000k Violet 7 7 7 Gray 8 8 8 White 9 9 9 6 - 2 - 3 - Silver3 W , 10% W , 10% W , 10%
1 - 9 - 6 - 0 - Red0 W , 0.1% Failure Rate W , 0.1% Failure Rate W , 0.1% Failure Rate
3-Digit Symbol Coding
(1%)
A = 100 , B = 101 , C = 102 , D = 103 , E = 104 , R = 10-1 , S = 10-2
Example:
1.00 W , 01S W , 09R W , 22A W , 62E
Symbol W 01 100 02 102 03 105 04 107 05 110 06 113 07 115 08 118 09 121 10 124 11 127 12 130 13 133 14 137 15 140 16 143
Symbol W 17 147 18 150 19 154 20 158 2 162 22 165 23 169 24 174 25 178 26 182 27 187 28 191 29 196 30 200 31 205 32 210
Symbol W 33 215 34 221 35 226 36 232 37 237 38 243 39 249 40 255 41 261 42 267 43 274 44 280 45 287 46 294 47 301 48 309
Symbol W 49 316 50 324 51 332 52 340 53 348 54 357 55 365 56 374 57 383 58 392 59 402 60 412 61 422 62 432 63 442 64 453
Symbol W 65 464 66 475 67 487 68 499 69 511 70 523 71 536 72 549 73 562 74 576 75 590 76 604 77 619 78 634 79 649 80 665
Symbol W 81 681 82 698 83 715 84 732 85 750 86 768 87 787 88 806 89 825 90 845 91 866 92 887 93 909 94 931 95 953 96 976
A = 100 , B = 101 , C = 102 , D = 103 , E = 104 , R = 10-1 , S = 10-2
Example:
2%, 1.00 W , S01 W , S25 W , S49 W , A42 W , D60
2% Symbol W 01 100 02 110 03 120 04 130 05 150 06 160 07 180 08 200 09 220 10 240 11 270 12 300 13 330 14 360 15 390 16 430 17 470 18 510 19 560 20 620 21 680 22 750 23 820 24 910
5% Symbol W 25 100 26 110 27 120 28 130 29 150 30 160 31 180 32 200 33 220 34 240 35 270 36 300 37 330 38 360 39 390 40 430 41 470 42 510 43 560 44 620 45 680 46 750 47 820 48 910
10% Symbol W 49 100 50 120 51 150 52 180 53 220 54 270 55 330 56 390 57 470 58 560 59 680 60 820
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