Resistor marking - Elcomps.com

Resistor color marking

Color marking is applied in the form of four or five color rings. Each color corresponds to a specific digital value. For resistors with four colored rings, the first and second rings indicate the value of resistance in Ohms, the third ring is a multiplier by which you need to multiply the nominal resistance value, and the fourth ring determines the percentage tolerance.

Resistors with a small tolerance (0.1% - 2%) are marked with five color rings. The first three are the numerical value of the resistance, the fourth is the multiplier, and the fifth is the tolerance.

Color marking of nominal resistance and tolerance

Ring color	Nominal resistance in Ohms				Tolerance,%
Ring color	First digit	Second digit	Third digit	Multiplier	Tolerance,%
Silver	-	-	-	10^-2	±10
Golden	-	-	-	10^-1	±5
Black	-	0	0	1	-
Brown	1	1	1	10	±1
Red	2	2	2	10²	±2
Orange	3	3	3	10³	-
Yellow	4	4	4	10⁴	-
Green	5	5	5	10⁵	±0,5
Blue	6	6	6	10⁶	±0,25
Violet	7	7	7	10⁷	±0,1
Gray	8	8	8	10⁸	±0,05
White	9	9	9	10⁹	-

SMD code marking

Foreign SMD resistors can be marked in several ways. The most common labeling system is three or four digits. The first two (three) digits indicate the value of resistance, the last digit is multiplier. Examples:

100 = 10×10⁰ = 10 Ohms

473 = 47×10³ = 47 kOhms

2251 = 225×10¹ = 2.25 kOhms

SMD resistors with a resistance of less than 10 ohms are labeled with a numerical resistance value. Sometimes the point is replaced by the letter R. For example: R02 or .02 = 0.02 Ohms. 2R2 = 2.2 Ohms.

Some small precision resistors are labeled with the new EIA-96 system. According to this system, a designation consists of two numbers and a letter. The numbers indicate the numerical value of the resistance, the letter multiplier (see table). Marking has two options: A11 (first letter, then numbers) denotes a tolerance of 2% to 10%. 11A denotes a tolerance of 1%.

Code	Value	Code	Value	Code	Value	Code	Value	Code	Value	Code	Value
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	17	147	18	150
19	154	20	158	21	162	22	165	23	169	24	174
25	178	26	182	27	187	28	191	29	196	30	200
31	205	32	210	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
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	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	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

Code	Resistance range
Z	0,1 … 1 Ω
Y (R)	1 … 10 Ω
X (S)	10 … 100 Ω
A	100 Ω … 1 kΩ
B (H)	1 … 10 kΩ
C	10 … 100 kΩ
D	100 kΩ … 1 MΩ
E	1 … 10 MΩ
F	10 … 100 MΩ

Note. The old designation is indicated in parentheses.

USSR resistor marking

The coded designation of the nominal resistance of the resistors consists of three or four characters including two numbers and a letter or three numbers and a letter. The letter of the code is a multiplier, denoting resistance in Ohms, and determines the position of the decimal point comma. The coded designation of the deviation consists of a Latin (in the old designation – Russian) letter.

Rated power is usually not marked, but determined by geometric shape and size of the resistor.

Coded designation of nominal resistance and tolerance.

Resistance
multiplier	Code
1 10³ 10⁶ 10⁹ 10¹²	R (Е) K (К) M (М) G (Г) T (Т)

Tolerance
Tolerance, %	Code
±0,001 ±0,002 ±0,005 ±0,01 ±0,02 ±0,05 ±0,1 ±0,25 ±0,5 ±1 ±2 ±5 ±10 ±20 ±30	E L R P U X B (Ж) C (У) D (Д) F (Р) G (Л) J (И) K (С) M (В) N (Ф)

Note: The old designation is in parentheses.

Code	Value	Code	Value	Code	Value	Code	Value	Code	Value	Code	Value
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	17	147	18	150
19	154	20	158	21	162	22	165	23	169	24	174
25	178	26	182	27	187	28	191	29	196	30	200
31	205	32	210	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
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	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	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

Code	Value	Code	Value	Code	Value	Code	Value	Code	Value	Code	Value
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	17	147	18	150
19	154	20	158	21	162	22	165	23	169	24	174
25	178	26	182	27	187	28	191	29	196	30	200
31	205	32	210	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
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	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	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

Code	Value	Code	Value	Code	Value	Code	Value	Code	Value	Code	Value
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	17	147	18	150
19	154	20	158	21	162	22	165	23	169	24	174
25	178	26	182	27	187	28	191	29	196	30	200
31	205	32	210	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
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	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	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