Mayloon Electronic Co., Ltd.,

  Chip  Resistors Value in a Decade

All SM resistors conform to a 3-digit or 4-digit code. But there are a number of codes, according to the tolerance of the resistor. It's getting very complicated.
Here is a basic 3-digit SM resistor:


A 330k SM resistor

The first two digits represent the two digits in the answer. The third digit represents the number of zero's you must place after the two digits. The answer will be OHMS. For example: 334 is written 33 0 000. This is written 330,000 ohms. The comma can be replaced by the letter "k". The final answer is: 330k.
222 = 22 00 = 2,200 = 2k2 
473 = 47 000  = 47,000 = 47k
105 = 10 00000 = 1,000,000 = 1M = one million ohms
There is one trick you have to remember. Resistances less than 100 ohms are written: 100, 220, 470. These are 10 and NO zero's = 10 ohms = 10R 
or 22 and no zero's = 22R  or 47 and no zero's = 47R.  Sometimes the resistor is marked: 10, 22 and 47 to prevent a mistake.

Remember:
R = ohms
k = kilo ohms = 1,000 ohms
M = Meg = 1,000,000 ohms
The 3 letters (R, k and M) are put in place of the decimal point. This way you cannot make a mistake when reading a value of resistance.

THE COMPLETE RANGE OF SM RESISTOR
MARKINGS
Click to see the complete range of SM resistor markings for 3-digit code: 

Click to see the complete range of SM resistor markings for 4-digit code: 

0000 is a value on a surface-mount resistor. It is a zero-ohm LINK!
Resistances less than 10 ohms have  'R' to indicate the position of the decimal point.
Here are some examples:

Three Digit Examples
Four Digit Examples
330 is 33 ohms - not 330 ohms
1000 is 100 ohms - not 1000 ohms
221 is 220 ohms
4992 is 49 900 ohms, or 49k9
683 is 68 000 ohms, or 68k
1623 is 162 000 ohms, or 162k
105 is 1 000 000 ohms, or 1M
0R56 or R56 is
0.56 ohms
8R2 is 8.2 ohms  

A new coding system has appeared on 1% types. This is known as the EIA-96 marking method. It consists of a three-character code. The first two digits signify the 3 significant digits of the resistor value, using the lookup table below. The third character - a letter - signifies the multiplier.

code
value
  
code
value
  
code
value
  
code
value
  
code
value
  
code
value
01
100
17
147
33
215
49
316
65
464
81
681
02
102
18
150
34
221
50
324
66
475
82
698
03
105
19
154
35
226
51
332
67
487
83
715
04
107
20
158
36
232
52
340
68
499
84
732
05
110
21
162
37
237
53
348
69
511
85
750
06
113
22
165
38
243
54
357
70
523
86
768
07
115
23
169
39
249
55
365
71
536
87
787
08
118
24
174
40
255
56
374
72
549
88
806
09
121
25
178
41
261
57
383
73
562
89
825
10
124
26
182
42
267
58
392
74
576
90
845
11
127
27
187
43
274
59
402
75
590
91
866
12
130
28
191
44
280
60
412
76
604
92
887
13
133
29
196
45
287
61
422
77
619
93
909
14
137
30
200
46
294
62
432
78
634
94
931
15
140
31
205
47
301
63
442
79
649
95
953
16
143
32
210
48
309
64
453
80
665
96
976

The multiplier letters are as follows:

letter
mult
  
letter
mult
F
100000
B
10
E
10000
A
1
D
1000
X or S
0.1
C
100
Y or R
0.01

22A is a 165 ohm resistor, 68C is a 49900 ohm (49k9) and 43E a 2740000 (2M74). This marking scheme applies to 1% resistors only.

A similar arrangement can be used for 2% and 5% tolerance types. The multiplier letters are identical to 1% ones, but occur before the number code and the following code is used:

2%   5%
code
value
   code value
code
value
   code value
01
100
 13
330
25
100
37
330
02
110
 14
360
26
110
38
360
03
120
 15
390
27
120
39
390
04
130
 16
430
28
130
40
430
05
150
 17
470
29
150
41
470
06
160
 18
510
30
160
42
510
07
180
 19
560
31
180
43
560
08
200
 20
620
32
200
44
620
09
220
 21
680
33
220
45
680
10
240
 22
750
34
240
46
750
11
270
 23
820
35
270
47
820
12
300
 24
910
36
300
48
910

With this arrangement, C31 is 5%, 18000 ohm (18k), and D18 is 510000 ohms (510k) 2% tolerance.
Always check with an ohm-meter (a multimeter) to make sure.

Chip resistors come in the following styles and ratings:
 Style: 0402, 0603, 0805, 1206, 1210, 2010, 2512, 3616, 4022
 Power Rating: 0402(1/16W), 0603(1/10W), 0805(1/8W), 1206(1/4W), 1210(1/3W), 2010(3/4W), 2512(1W), 2512(2W), 2728(3W),2725(4W).
 Tolerance: 0.1%, 0.5%, 1%, 5%
 Temperature Coefficient: 25ppm 50ppm 100ppm

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