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

## SMD Resistor Codes

### 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)

### Electrical Technology

1. Murthy Challa says:

very essential and and useful information. Thanq

2. Upendra singh says:

This kind of information makes man like engineer.

3. Tarak nath paul says:

very useful. thanks.

4. Abbas M K says:

very useful tables and lesson thank you

Very Useful Information Thanks.

6. bob alvin pagarigan says:

any replacement for msd resistor? thanks

7. maria says:

very good information thank you for sharing with us…………

8. telmo says:

en resistencia de superficie 40r2 es 40.7 ohmios? gracias

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