Standard Component Values

BS2488 and IEC publication 63 specify standard component values.

The values, summarised in the table below, span a single decade and approximate to a geometric progression. The basic values are repeated for each decade by multiplying by powers of 10.

The table identifies the values for the 6 most common series. The E number indicates the number of values in each decade. In general the lower numbered series are used for low tolerance components such as large electrolytic capacitors. E96 is most commonly applied to high precision components like 0.1% resistors.

E3 E6 E12 E24 E48 E96
10 10 10 10 100 100
102
105 105
107
11 110 110
113
115 115
118
12 12 121 121
124
127 127
13 130
133 133
137
140 140
143
147 147
15 15 15 150
154 154
158
16 162 162
165
169 169
174
178 178
18 18 182
187 187
191
196 196
20 200
205 205
210
215 215
22 22 22 22 221
226 226
232
237 237
24 243
249 249
255
261 261
267
27 27 274 274
280
287 287
294
30 301 301
309
316 316
324
33 33 33 332 332
340
348 348
357
36 365 365
374
383 383
39 39 392
402 402
412
422 422
43 432
442 442
453
464 464
47 47 47 47 475
487 487
499
51 511 511
523
536 536
549
56 56 562 562
576
590 590
604
62 619 619
634
649 649
665
68 68 68 681 681
698
715 715
732
75 750 750
768
787 787
806
82 82 825 825
845
866 866
887
91 909 909
931
953 953
976

 

Tolerance Codes

The standard also specifies a series of code letters for component tolerances as shown here.

Code Tolerance
B
± 0.1 %
C
± 0.25 %
D
± 0.5 %
F
± 1 %
G
± 2 %
J
± 5 %
K
± 10 %
M
± 20 %
Z
-20% to +80%

 

 
Creative  Design  Innovation