For sub-100 ohm values, an “R” is used to mark the decimal point location. Simply click the corresponding digits to calculate the exact resistance value.
How to Read 4-Digit SMD Resistor Markings
The 4 digit SMD resistors are used on high precision 1% surface mount component. Which giving extra significant figure that the 3-Digit resistors. The first three digits are numeric values and fourth one is its multiplier.
Significant Digits vs. The Multiplier
- First three digit is numeric values.
- Fourth digit is its multiplier
Understanding the Decimal Point “R” in SMD Codes
The R represents the decimal point, in tiny electronic component adding decimal point mislead its value or difficult to identify. So replacing with the decimal dot (.) is great way to avoid mistakes.
Common 4-Digit SMD Resistor Code Reference Table
| SMD Code Markings | Mathematical Formula | Calculated Resistance | Precision Tolerance |
|---|---|---|---|
| 1000 | 100 × 100 | 100 Ω | ±1% |
| 4701 | 470 × 101 | 4.7 kΩ (4700 Ω) | ±1% |
| 1002 | 100 × 102 | 10 kΩ (10,000 Ω) | ±1% |
| 2203 | 220 × 103 | 220 kΩ | ±1% |
| 15R0 | Decimal at R | 15.0 Ω | ±1% |
| R100 | Decimal at start | 0.10 Ω | ±1% |
Frequently Asked Questions (FAQ)
3-digit codes represent a standard +/-5% tolerance, while 4-digit codes provide a higher degree of resolution for tight +/-1% precision tolerance components.
A 4-digit code reading of “0000” is signifies a zero ohm surface mount jumper and it link used to bridge connections across the PCB traces.
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