SMD Resistor Code Calculator (3-Digit, 4-Digit, EIA-96)
PCB reverse engineering, smartphone and laptop motherboard micro-soldering. Decodes surface mount resistor markings into exact resistance values with tolerance ratings.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between SMD Code String (e.g. '472', '1001', '01A', 'R050') to determine Resistance Value (Ohms / Kilohms / Milliohms), Tolerance (1% or 5%). In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.
Decodes surface mount resistor markings into exact resistance values with tolerance ratings.
Typical Application & Industry Guidelines
PCB reverse engineering, smartphone and laptop motherboard micro-soldering.
SMD Resistor Code Calculator (3-Digit, 4-Digit, EIA-96) Benchmark Lookup Table
| SMD Marking | Decoded Ohms | Tolerance | Application |
|---|---|---|---|
| 102 | 1,000 Ohms (1 kOhm) | ± 5% | Standard Pull-up |
| 472 | 4,700 Ohms (4.7 kOhm) | ± 5% | I2C Bus Pull-up |
| 103 | 10,000 Ohms (10 kOhm) | ± 5% | Microcontroller Reset |
| 1001 | 1,000 Ohms (1 kOhm) | ± 1% | Precision Voltage Divider |
| 4702 | 47,000 Ohms (47 kOhm) | ± 1% | Audio Op-Amp Feedback |
| R050 | 0.050 Ohms (50 mOhm) | ± 1% | Current Sensing Shunt |