Standard Resistor Values
When selecting a resistor for a circuit, it's common to choose a standard value that is equal to or greater than the desired resistance.
While the E12 series is the most common, other series are also available. It is a good practice to specify resistors from a low series when tolerance requirements are not high. The most common series are:
The E12 series includes 12 values per decade. The E24 series expands on this, providing 24 values per decade, including the E12 values.
Here are some common E12 resistor values: The series looks as follows: 1.0 - 1.2 - 1.5 - 1.8 - 2.2 - 2.7 - 3.3 - 3.9 - 4.7 - 5.6 - 6.8 - 8.2
And some common E24 resistor values: The series looks as follows: 1– 1.1 – 1.2 – 1.3 – 1.5 – 1.6 – 1.8 – 2.0 – 2.1 – 2.2 – 2.4 – 2.7 – 3.0 – 3.3 – 3.6 – 3.3 – 3.9 – 4.3 – 4.7 – 5.1 – 5.6 – 6.2 – 6.8 – 7.5 – 8.2 – 9.1
Preferred Values or E-series
To understand the E-series sets of preferred values, we will examine the E12 in detail. E12 means that is divided into 12 steps on a logarithmic scale
- E6 20% Tolerance
- E12 10% Tolerance
- E24 5% (also available with 1% Tolerance)
- E48 2% Tolerance
- E96 1% Tolerance
- E192 0.5% (also used for resistors with 0.25% and 0.1% Tolerance).
E6 series (tolerance 20%)
E12 series (tolerance 10%)
10 12 15 18 22 27
33 39 47 56 68 82
E24 series (tolerance 5% and 1%)
10 11 12 13 15 16
18 20 22 24 27 30
33 36 39 43 47 51
56 62 68 75 82 91
E48 series (tolerance 2%)
100 105 110 115 121 127
133 140 147 154 162 169
178 187 196 205 215 226
237 249 261 274 287 301
316 332 348 365 383 402
422 442 464 487 511 536
562 590 619 649 681 715
750 787 825 866 909 953
E96 series (tolerance 1%)
100 102 105 107 110 113
115 118 121 124 127 130
133 137 140 143 147 150
154 158 162 165 169 174
178 182 187 191 196 200
205 210 215 221 226 232
237 243 249 255 261 267
274 280 287 294 301 309
316 324 332 340 348 357
365 374 383 392 402 412
422 432 442 453 464 475
487 499 511 523 536 549
562 576 590 604 619 634
649 665 681 698 715 732
750 768 787 806 825 845
866 887 909 931 953 976
E192 series (tolerance 0.5%, 0.25% and 0.1%)
100 101 102 104 105 106
107 109 110 111 113 114
115 117 118 120 121 123
124 126 127 129 130 132
133 135 137 138 140 142
143 145 147 149 150 152
154 156 158 160 162 164
165 167 169 172 174 176
178 180 182 184 187 189
191 193 196 198 200 203
205 208 210 213 215 218
221 223 226 229 232 234
237 240 243 246 249 252
255 258 261 264 267 271
274 277 280 284 287 291
294 298 301 305 309 312
316 320 324 328 332 336
340 344 348 352 357 361
365 370 374 379 383 388
392 397 402 407 412 417
422 427 432 437 442 448
453 459 464 470 475 481
487 493 499 505 511 517
523 530 536 542 549 556
562 569 576 583 590 597
604 612 619 626 634 642
649 657 665 673 681 690
698 706 715 723 732 741
750 759 768 777 787 796
806 816 825 835 845 856
866 876 887 898 909 920
931 942 953 965 976 988
