E Series
In electronics, international standard IEC 60063 defines another preferred number series for resistors, capacitors, inductors and Zener diodes. It works similarly to the Renard series, except that it subdivides the interval from 1 to 10 into 6, 12, 24, etc. steps. These subdivisions ensure that when some arbitrary value is replaced with the nearest preferred number, the maximum relative error will be on the order of 20%, 10%, 5%, etc.
Use of the E series is mostly restricted to resistors, capacitors, inductors and zener diodes. Commonly produced dimensions for other types of electrical components are either chosen from the Renard series instead (for example fuses) or are defined in relevant product standards (for example wires).
The IEC 60063 numbers are as follows. The E6 series is every other element of the E12 series, which is in turn every other element of the E24 series:
E6 ( 20%): 10 15 22 33 47 68 E12 ( 10%): 10 12 15 18 22 27 33 39 47 56 68 82 E24 ( 5%): 10 12 15 18 22 27 33 39 47 56 68 82 11 13 16 20 24 30 36 43 51 62 75 91With the E48 series, a third decimal place is added, and the values are slightly adjusted. Again, the E48 series is every other value of the E96 series, which is every other value of the E192 series:
E48 ( 2%): 100 121 147 178 215 261 316 383 464 562 681 825 105 127 154 187 226 274 332 402 487 590 715 866 110 133 162 196 237 287 348 422 511 619 750 909 115 140 169 205 249 301 365 442 536 649 787 953 E96 ( 1%): 100 121 147 178 215 261 316 383 464 562 681 825 102 124 150 182 221 267 324 392 475 576 698 845 105 127 154 187 226 274 332 402 487 590 715 866 107 130 158 191 232 280 340 412 499 604 732 887 110 133 162 196 237 287 348 422 511 619 750 909 113 137 165 200 243 294 357 432 523 634 768 931 115 140 169 205 249 301 365 442 536 649 787 953 118 143 174 210 255 309 374 453 549 665 806 976 E192 (0.5%) 100 121 147 178 215 261 316 383 464 562 681 825 101 123 149 180 218 264 320 388 470 569 690 835 102 124 150 182 221 267 324 392 475 576 698 845 104 126 152 184 223 271 328 397 481 583 706 856 105 127 154 187 226 274 332 402 487 590 715 866 106 129 156 189 229 277 336 407 493 597 723 876 107 130 158 191 232 280 340 412 499 604 732 887 109 132 160 193 234 284 344 417 505 612 741 898 110 133 162 196 237 287 348 422 511 619 750 909 111 135 164 198 240 291 352 427 517 626 759 920 113 137 165 200 243 294 357 432 523 634 768 931 114 138 167 203 246 298 361 437 530 642 777 942 115 140 169 205 249 301 365 442 536 649 787 953 117 142 172 208 252 305 370 448 542 657 796 965 118 143 174 210 255 309 374 453 549 665 806 976 120 145 176 213 258 312 379 459 556 673 816 988The E192 series is also used for 0.25% and 0.1% tolerance resistors.
1% resistors are available in both the E24 values and the E96 values.
Read more about this topic: Preferred Number
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