Resistor Color Code Guide
Black Brown Red Orange Yellow Green Blue Violet Grey White
0
1
2
3
4
5
6
7
8
9
The mnemonic
Bad Boys Ravish Only Young Girls But Violet Gives Willingly
B B ROY G reat B ritain V ery G ood W ife wearing G old S ilver necklace.
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
1
BS 1852 Coding for resistor values
BS 1852(British Standard 1852). The letter R is used for Ohms and K for Kohms M for
Megohms and placed where the decimal point would go.
At the end is a letter that represents tolerance Where M=20%, K=10%, J=5%, G=2%, and F=1%
D=.5% C=.25 B=.1%
BS 1852 coding examples
R33
0.33 ohms
2R2
2.2 ohms
470R
470 Ohms
1K2
1.2K ohms
22K
22K ohms
22K2 22.2K ohms
4M7
4.7M ohms
5K6G 5.6K ohms 2%
33KK 33k Ohms 10%
47K3F 47.3 K Ohms 1%
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
2
Standard EIA Decade Resistor Values Table
The Electronic Industries Association (EIA), and other authorities, specify standard values for
resistors, sometimes referred to as the "preferred value" system. The preferred value system has
its origins in the early years of the last century at a time when most resistors were carbongraphite with relatively poor manufacturing tolerances. The rationale is simple - select values
for components based on the tolerances with which they are able to be manufactured. Using
10% tolerance devices as an example, suppose that the first preferred value is 100 ohms. It
makes little sense to produce a 105 ohm resistor since 105 ohms falls within the 10% tolerance
range of the 100 ohm resistor. The next reasonable value is 120 ohms because the 100 ohm
resistor with a 10% tolerance is expected to have a value somewhere between 90 and 110 ohms.
The 120 ohm resistor has a value ranging between 110 and 130 ohms. Following this logic, the
preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120,
150, 180, 220, 270, 330 and so on (rounded appropriately); this is the E12 series shown in the
table
below.
The EIA "E" series specify the preferred values for various tolerances. The number following
the "E" specifies the number of logarithmic steps per decade. The table below is normalized for
the decade between 100 and 1,000. The values in any decade can be derived by merely dividing
or multiplying the table entries by powers of 10. The series are as follows:
E3 50% tolerance (no longer used)
E6 20% tolerance (now seldom used)
E12 10% tolerance
E24 5% tolerance
E48 2% tolerance
E96 1% tolerance
E192 0.5, 0.25, 0.1% and higher tolerances
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
3
E6 E12 E24 E48 E96 E192
E6 E12 E24 E48 E96 E192
100
E6 E12 E24 E48 E96 E192
215
100
464
215
101
464
218
100
470
215
464
102
221
102
475
221
104
475
223
100
481
220
470
105
226
105
487
226
106
487
229
105
493
226
487
107
232
107
499
232
109
499
234
100
505
220
470
110
237
110
111
511
240
110
517
237
511
113
243
113
100
523
243
114
110
220
523
246
240
470
530
510
115
249
115
536
249
117
536
252
115
542
249
536
118
255
118
549
255
549
120
258
556
121
261
562
121
261
123
562
264
121
569
261
562
124
267
124
120 120
576
267
126
270 270
576
271
127
560 560
583
274
127
127
511
237
590
274
129
130 130
274
590
277
280 280
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
590
597
604 604
4
132
284
133
612
287
133
619
287
135
619
291
133
626
287
619
137
294
137
634
294
138
634
298
130
642
300
620
140
301
140
649
301
142
649
305
140
657
301
649
143
309
143
665
309
145
665
312
147
673
316
147
681
316
149
681
320
147
690
316
681
150
324
150
698
324
152
698
328
150
706
330
680
154
332
154
332
156
715
336
154
723
332
715
158
340
158
150 150
732
340
160
330 330
732
344
162
680 680
741
348
162
750
348
164
750
352
162
759
348
750
165
357
165
160
768
357
167
360
768
361
169
750
777
365
169
169
715
787
365
172
174 174
365
787
370
374 374
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
787
796
806 806
5
176
379
178
816
383
178
825
383
180
825
388
178
835
383
825
182
392
182
845
392
184
845
397
180
856
390
820
187
402
187
866
402
189
866
407
187
876
402
866
191
412
191
887
412
193
180
887
417
390
898
820
196
422
196
909
422
198
909
427
196
920
422
909
200
432
200
931
432
203
200
931
437
430
942
910
205
442
205
953
442
208
205
953
448
442
210
210
453
453
213
965
953
976
976
459
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
988
6
Passive components
Resistor
Capacitors:
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
7
Inductors
Course: P203, Sem: III, Section: 2016-17, (Last updated: 28th July ’16, Dr. Pratap. K. Sahoo)
8