SMD Resistor Codes
How to calculate or 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?
Also read:
Reading 3Digit 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 3Digit SMD Resistor Codes
250 = 25 x 10^{0 }= 25 x 1 = 25 Ω (This is only and only 25Ω not 250 Ω)
100 = 10 x 10^{0} = 10x 1 = 10 Ω
721 = 72 x 10^{1 }= 72 x 10 = 720 Ω
102 = 10 × 10^{2} =10 x 100 = 1000Ω or 1kΩ
915 = 91 x 10^{5} = 91 x 100000 = 9,100,000 Ω = 9.1MΩ
915 = 91 x 10^{5} = 91 x 100000 = 9,100,000 Ω = 9.1MΩ
4R7 = 4.7Ω
R12 = 0.12 Ω
Reading 4Digit 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 (3Digit 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 (4digit SMD resistors (E96 series)
 Resistances below 10 ohms (Ω) do not have a multiplier
 Also read: Resistor & Types of Resistors
Examples of 4Digit SMD Resistor Codes
2500 = 250 x 10^{0 }= 250 x 1 = 250 Ω (This is only and only 250Ω not 2500 Ω)
1000 = 100 x 10^{0} = 100x 1 = 100 Ω
7201 = 720 x 10^{1 }= 720 x 10 = 7200 Ω or 7.2kΩ
1001 = 100 × 10^{1} =100 x 10 = 1000 Ω or 1kΩ
1004 = 100 × 10^{4} =100 x 10000 = 1000,000 Ω or 1MΩ
R102 =0.102 Ω (4digit SMD resistors (E96 series)
0R10 =0.1 x 10^{0 }= 0.1 x 1 = 0.1 Ω (4digit SMD resistors (E24 series)
25R5 = 25.5Ω (4digit SMD resistors (E96 series))
Reading EIA96 SMD Resistor Codes (for SMD Resistors)
EIA96 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 EIA96 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 EIA96 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 EIA96 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 EIA96 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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very essential and and useful information. Thanq
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very useful tables and lesson thank you
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