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SMD Resistor Codes: How to Find the value of SMD Resistors

SMD Resistor Codes

How to calculate or Find the value of SMD Resistors?SMD Resistor Codes: How to Find the value of SMD Resistors

SMD resistor: Surface Mount Technology

SMD Resistor stands for “Surface Mount device” (Taken out from SMT = Surface Mount Technology) Resistor. These tiny chips are marked with three (3) or four (4) digit codes which is called SMD Resistor codes to indicate their resistance values.
Below are the roles to follow for that how to read SMD Resistor codes and values?

Reading 3-Digit SMD Resistor Codes (for SMD Resistors)

  • The first, Two (2) digits or numbers will indicate the significant digits or numbers
  • The third one will be multiplier (in Power of Ten i.e. 10^ something) and then must be multiply by the first Two (2) significant digits or number or the third one will indicate that how many Zeros should be add to the first Two (2) significant digits or number
  • The letter “R” is used for Decimal Point “.” i.e. 1.1 Ω = 1R1 Ω
  • Resistances below 10 ohms (Ω) do not have a multiplier

Examples of 3-Digit SMD Resistor Codes

250 = 25 x 100 = 25 x 1 = 25 Ω (This is only and only 25 not 250 )
100 = 10 x 100 = 10x 1 = 10 Ω
721 = 72 x 101 = 72 x 10 = 720 Ω
102 = 10 × 102 =10 x 100 = 1000Ω or 1kΩ
915 = 91 x 105 = 91 x 100000 = 9,100,000 Ω = 9.1MΩ
4R7 = 4.7Ω
R12 = 0.12 Ω

Reading 4-Digit SMD Resistor Codes (for SMD Resistors)

There is nothing new but this is the same method to read the value of SMD resistors. The only difference is that with the significant numbers. I copied the above method (3-Digit Codes) and then past here so you can see that only First one is changed and other three rules are same.
  • The first, Two (3) digits or numbers will indicate the significant digits or numbers
  • The fourth one will be multiplier (in Power of Ten i.e. 10^ something) and then must be multiply by the first Two (3) significant digits or number or the fourth one will indicate that how many Zeros should be add to the first Two (2) significant digits or number
  • The letter “R” is used for Decimal Point “.” i.e. 11.5 Ω = 11R5 Ω (4-digit SMD resistors (E96 series)
  • Resistances below 10 ohms (Ω) do not have a multiplier

Examples of 4-Digit SMD Resistor Codes

2500 = 250 x 100 = 250 x 1 = 250 Ω (This is only and only 250 not 2500 )
1000 = 100 x 100 = 100x 1 = 100 Ω
7201 = 720 x 101 = 720 x 10 = 7200 Ω or 7.2kΩ
1001 = 100 × 101 =100 x 10 = 1000 Ω or 1kΩ
1004 = 100 × 104 =100 x 10000 = 1000,000 Ω or 1MΩ
R102 =0.102 Ω (4-digit SMD resistors (E96 series)
0R10 =0.1 x 100 = 0.1 x 1 = 0.1 Ω (4-digit SMD resistors (E24 series)
25R5 = 25.5Ω (4-digit SMD resistors (E96 series))

Reading EIA-96 SMD Resistor Codes (for SMD Resistors)

EIA-96 SMD Resistor Codes marking method is a new method which appeared on 1% of all SMD resistors. It consists on 3- Character codes.
Below are the rules to follow for reading the value of EIA-96 SMD resistors.
  • The first, Two (2) digits or numbers will indicate the significant digits or numbers
  • The third one “Letter” is a multiplier (in Power of Ten i.e. 10^ something) and then must be multiply by the first Two (2) significant digits.
  •  Must follow the codes in Table (1) and (2)
Below is the table (1) to shows the multiplier values of different Letters using in EIA-96 coding system for SMD Resistor Codes.

Table (1)

Letters
Multipliers
Z
0.001
R or Y
0.01
S or X
0.1
A
1
B or H
10
C
100
D
1000
E
10000
F
100000

Also, look in the examples of reading EIA-96 SMD Resistor Codes for importance the use of table (2)

Table (2)… 
Table (2)
Code
Value
Code
Value
Code
Value
Code
Value
01
100
25
178
49
316
73
562
02
102
26
182
50
324
74
576
03
105
27
187
51
332
75
590
04
107
28
191
52
340
76
604
05
110
29
196
53
348
77
619
06
113
30
200
54
357
78
634
07
115
31
205
55
365
79
649
08
118
32
210
56
374
80
665
09
121
33
215
57
383
81
681
10
124
34
221
58
392
82
698
11
127
35
226
59
402
83
715
12
130
36
232
60
412
84
732
13
133
37
237
61
422
85
750
14
137
38
243
62
432
86
768
15
140
39
249
63
442
87
787
16
143
40
255
64
453
88
806
17
147
41
261
65
464
89
825
18
150
42
267
66
475
90
845
19
154
43
274
67
487
91
866
20
158
44
280
68
499
92
887
21
162
45
287
69
511
93
909
22
165
46
294
70
523
94
931
23
169
47
301
71
536
95
953
24
174
48
309
72
549
96
976

Examples of EIA-96 SMD Resistor Codes

01F =     10M
01E =     1MΩ
01C=     10kΩ
01B =   1kΩ
01A =   100Ω
01X =   10Ω
01Y =   1Ω
66X = 475 x 0.1 = 47.5 …→ (in table (2), 66 = 475 and in table (1), X = 0.1. so 475 x 0.1 = 47.1Ω)
85Z = 750 x 0.001 = 0.75Ω → (in table (2), 85 = 750 and in table (1), Z = 0.001. so 750 x 0.001 = 0.75Ω)
36H = 232 x10 = 2320Ω = 2.32kΩ → (in table (2), 36 = 232 and in table (1), H = 10. so 232 x 10= 2.32kΩ)
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4 comments

  1. very essential and and useful information. Thanq

  2. Upendra singh

    This kind of information makes man like engineer.

  3. Tarak nath paul

    very useful. thanks.

  4. very useful tables and lesson thank you

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