It means 10 kΩ. The first two digits (10) are the value and the third (3) is the power of ten: 10 × 10³ = 10,000 Ω. It is not 103 ohms.
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Read an SMD resistor marking or find the code for a value, in 3-digit, 4-digit, R and EIA-96 formats
SMD resistors are too small for color bands, so they carry a printed code. In the 3-digit marking the first two digits are significant figures and the third is the power of ten: 103 is 10 × 10³ = 10 kΩ, 472 is 47 × 10² = 4.7 kΩ and 151 is 150 Ω. The 4-digit marking, which gives more precision, uses three figures and a multiplier: 1002 is 100 × 10² = 10 kΩ. The letter R stands for the decimal point in small values: 4R7 is 4.7 Ω and R47 is 0.47 Ω. 1% parts usually use EIA-96: two digits give the position in the E96 series (01 = 100, 02 = 102, up to 96 = 976) and a letter gives the multiplier, so 01C is 100 × 100 = 10 kΩ. The tool reads these formats, warns when a code has two possible readings, and works backwards from a value to the marking.
The 3-digit format is the most common on 5% parts. Two figures and an exponent: 220 is 22 Ω (22 × 10⁰), 221 is 220 Ω, 222 is 2.2 kΩ, 104 is 100 kΩ and 105 is 1 MΩ. A frequent mistake is reading 103 as one hundred and three ohms; the last digit is always how many zeros to add.
The 4-digit format is for higher-precision parts: 1000 is 100 Ω, 4701 is 4.7 kΩ and 2203 is 220 kΩ. When the value has a decimal point, R marks its place: 4R70 is 4.7 Ω, 10R0 is 10 Ω and R100 is 0.1 Ω. In EIA-96 a letter replaces the exponent, which keeps the marking to three characters even on 1% parts.
In EIA-96 the two digits are not the value: they are the position in a table of 96 base values between 100 and 976. Index 01 is 100, 10 is 124, 25 is 178 and 96 is 976. The letter multiplies that base: A is × 1, B is × 10, C is × 100, D is × 1,000, E is × 10,000, F is × 100,000, and Z, Y and X cover × 0.001, × 0.01 and × 0.1. So 01C is 100 × 100 = 10 kΩ and 10C is 124 × 100 = 12.4 kΩ.
There is one ambiguity: R, S and H appear as alternate letters for Y, X and B, and R is also the decimal point in the 3-digit notation. A code like 47R may be 47 Ω on a schematic or 301 × 0.01 = 3.01 Ω on an EIA-96 part. The tool shows both readings. When in doubt, measure the resistor with a multimeter.
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It means 10 kΩ. The first two digits (10) are the value and the third (3) is the power of ten: 10 × 10³ = 10,000 Ω. It is not 103 ohms.
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