Decode Any SMD Component Marking
A free browser-based SMD code decoder that identifies resistor and capacitor values from surface-mount markings. Supports 3-digit, 4-digit, and EIA-96 coding systems with auto-detection. Includes reverse lookup, package size reference, and a full EIA-96 code table.
Identify SMD resistors and capacitors by their tiny marking codes
| Code | Metric | Size (mm) |
|---|---|---|
| 0201 | 0603 | 0.6 × 0.3 |
| 0402 | 1005 | 1.0 × 0.5 |
| 0603 | 1608 | 1.6 × 0.8 |
| 0805 | 2012 | 2.0 × 1.25 |
| 1206 | 3216 | 3.2 × 1.6 |
| 1210 | 3225 | 3.2 × 2.5 |
| 1812 | 4532 | 4.5 × 3.2 |
| 2010 | 5025 | 5.0 × 2.5 |
| 2512 | 6332 | 6.3 × 3.2 |
Two digits + one letter. Digits = base value from table, letter = multiplier (S=×0.01, R=×0.1, A=×1, B=×10, C=×100, D=×1k, E=×10k, F=×100k)
Features
How to Decode SMD Markings
- Enter the code. Type the marking from the SMD component — numbers and/or letters exactly as printed. The decoder auto-detects the system.
- Read the result. See the decoded resistance or capacitance value with the identified coding system and typical tolerance.
- Use reverse lookup. Enter a known value (e.g. 4.7kΩ) to find all possible SMD codes for that component.
FAQ
What is the 3-digit SMD code?
The first two digits are significant figures, the third is the multiplier (number of zeros). Example: 472 = 47 × 10² = 4,700 Ω = 4.7 kΩ.
What is the 4-digit SMD code?
Same as 3-digit but with three significant figures. Example: 4702 = 470 × 10² = 47,000 Ω = 47 kΩ. Used for precision resistors.
What is EIA-96?
A two-digit + one-letter system for 1% precision resistors. The digits (01-96) map to a base value from a lookup table. The letter is the multiplier: A=×1, B=×10, C=×100, D=×1k, E=×10k, F=×100k.
How do I know which system to use?
If the code is 3 digits (all numbers): 3-digit system. If 4 digits: 4-digit system. If 2 digits + 1 letter: EIA-96. The decoder auto-detects this.
What do the package codes mean?
Package codes like 0402, 0603, 0805 indicate the component size in imperial units (hundredths of an inch). 0805 = 0.08" × 0.05" = 2.0mm × 1.25mm.
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