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

How to Calculate & Find the Value of SMD & EIA-96 SMD Resistor 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 are called SMD Resistor codes to indicate their resistance values.

Below are some given roles which help to know the exact value of an SMD resistor by seeing the printed character codes on those tiny chips.

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Reading 3-Digit SMD Resistor Codes

  • 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 added 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 25Ω not 250 Ω)

100 = 10 x 100 = 10 x 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

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Reading 4-Digit SMD Resistor Codes

There is nothing new but the same method to read the value of SMD resistors as mentioned above for the 3 digits SMD roosters. The only difference is that with the significant numbers. In short, in the above method, the first two digits indicate significant numbers while in this method, the first three digits or numbers will show the significant numbers. Lets see how to do it.

  • The first three (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.

Also read: Resistor & Types of Resistors

Examples of 4-Digit SMD Resistor Codes

2500 = 250 x 100 = 250 x 1 = 250 Ω (This is only and only 250Ω not 2500 Ω)

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

EIA-96 SMD Resistor Codes marking method is a new method which appeared on 1% of all SMD resistors. It consists of 3- Character codes.

Below are the rules to follow to know 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 multiplied by the first Two (2) significant digits.
  •  Must follow the codes in Table (1) and (2).

Below is the table (1) to show the multiplier values of different Letters using the EIA-96 coding system for SMD Resistor Codes.

Table (1)

LettersMultipliers
Z0.001
R or Y0.01
S or X0.1
A1
B or H10
C100
D1000
E10000
F100000

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

Table (2)

CodeValueCodeValueCodeValueCodeValue
01100251784931673562
02102261825032474576
03105271875133275590
04107281915234076604
05110291965334877619
06113302005435778634
07115312055536579649
08118322105637480665
09121332155738381681
10124342215839282698
11127352265940283715
12130362326041284732
13133372376142285750
14137382436243286768
15140392496344287787
16143402556445388806
17147412616546489825
18150422676647590845
19154432746748791866
20158442806849992887
21162452876951193909
22165462947052394931
23169473017153695953
24174483097254996976

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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9 Comments

  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

  5. Muhammad Hafeez says:

    Very Useful Information Thanks.

  6. bob alvin pagarigan says:

    any replacement for msd resistor? thanks

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

  8. en resistencia de superficie 40r2 es 40.7 ohmios? gracias

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