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Components / SMD

SMD Resistor Code

Decode chip-resistor markings, including 3- and 4-digit codes, R/K/M notation and EIA-96.

Marking on the component

Type the code printed on the resistor to decode it instantly.

Accepted formats
4724R7100101C
CHIP MARKING: 472472

CHIP MARKING

4.7 kΩ

3-digit code

Decoded nominal value

4.7 kΩ

Decoded nominal value4.7 kΩ
Detected format3-digit code
Rule applied47 × 10²
ToleranceNot encoded in the marking

Component guide

Read an SMD resistor marking with confidence

SMD resistors may use a three- or four-digit code, R/K/M notation, or EIA-96. The marking primarily identifies nominal value: tolerance, power, technology, and sometimes even the exact convention still need confirmation in the datasheet.

Method and assumptions

A three-digit SMD code combines two significant figures with a decimal multiplier; a four-digit code uses three. EIA-96 combines an E96-series index (01 to 96) with a multiplier letter. R notation commonly acts as the decimal separator, for example 4R7 for 4.7 Ω.

Inputs to verify

Readable marking

Transcribe the printed characters without completing or changing them. The decoder supports standard three- and four-digit, R/K/M, and EIA-96 formats.

Component context

The package, schematic function, and BOM reference help confirm that it is an SMD resistor and that the decoded value is plausible.

Recommended workflow

  1. 1Enter the complete marking, for example 472, 4R7, 1001, or 01C.
  2. 2Read the nominal value, detected format, and decoding rule shown by the tool.
  3. 3Confirm value, tolerance, power rating, and package in the BOM or datasheet before replacement.

Checkable example

472 means 47 × 10², or 4.7 kΩ. For 01C, EIA-96 index 01 corresponds to 100 and C means ×100, so the value is 10 kΩ. The marking alone does not guarantee the part’s power rating or tolerance.

Limits to keep in mind

Formats are not universal across all technologies; shunt resistors and small packages may carry no code; and some EIA-96 multipliers occur in manufacturer-specific variants. Never infer exact part number, power rating, or tolerance from a marking alone.

Frequently asked questions

What do 000 or 0R0 mean?

They generally identify a zero-ohm link used as an SMD jumper. Its real resistance is low but not zero; check current rating and package before replacement.

Does EIA-96 always mean ±1%?

EIA-96 is often associated with E96 precision values, but an observed marking does not replace the manufacturer specification. Consult the datasheet or BOM for actual tolerance.

References to consult

  • Method references: IEC 60062; SMD resistor manufacturer datasheets for 3/4-digit, R/K/M, and EIA-96 rules; and the relevant product BOM and schematic.

Original educational content, reviewed for technical clarity on 20 August 2026. Always verify datasheets, applicable standards, and your design before power-up or manufacture.