SMD Shunt Resistor for PCB Current Sensing in Power & Industrial Applications
Description
SMD Shunt Resistor for PCB Current Sensing
SMD Shunt Resistors are compact surface mount current sensing components designed for accurate current measurement in PCB-based electronic systems. With low resistance values and stable electrical performance, they provide reliable solutions for power supplies, battery management systems (BMS), DC-DC converters, and industrial electronics.
Available in various SMD package sizes including 1206, 1575, 2010, and 2512, these PCB-mounted shunt resistors support different current sensing requirements while maintaining excellent thermal stability and measurement accuracy.
Key Features of SMD Shunt Resistors
Low Resistance Range
Available from 0.1mΩ to 100mΩ for accurate current measurement.
High Measurement Accuracy
Tolerance options of ±1%, ±0.5%, and ±0.25% support precision current sensing applications.
Stable TCR Performance
Temperature coefficient below ±75 ppm/°C helps minimize resistance drift.
Compact SMD Package Design
Surface mount structure enables easy PCB integration and space-saving layouts.
Metal Alloy Resistance Element
Provides low thermal EMF, excellent stability, and reliable performance under continuous operation.
Multiple Package Options
Available in standard footprints including 1206, 1575, 2010, and 2512.
Challenges in PCB Current Sensing Applications
Accurate measurement in low resistance circuits
Small voltage signals can be affected by resistance errors and PCB layout limitations.
Thermal management in compact designs
Heat generation may influence measurement stability during high current operation.
Resistance variation caused by temperature
Temperature changes can affect sensing accuracy without stable TCR performance.
Limited PCB space
Compact electronic designs require reliable surface mount current sensing solutions.
How This SMD Shunt Resistor Solves Them
- Low resistance design for precise current sensing
- Compact SMD package saves PCB space
- High thermal stability ensures consistent performance
- Suitable for high-density electronic designs
Product Size
| Series | Package | Power | Resistance (min) | Resistance (max) | Tolerance | TCR (ppm/°C) | Part / Variant |
|---|---|---|---|---|---|---|---|
| LRS | 2512 | 3W – 6W | 0.1 mΩ | 1 mΩ | ±0.1%, ±0.2%, ±0.5%, ±1%, ±2%, ±5% | ±15 – ±75 | LRS2512 |
| LRS | 1206 | 1W – 2W | 0.5 mΩ | 3 mΩ | ±0.1% … ±5% | ±15 – ±75 | LRS1206 |
| LRS | 6568 | 5W – 7W | 0.1 mΩ | 0.2 mΩ | ±0.1% … ±5% | ±15 – ±75 | LRS6568 |
| LRS | 1575 (5930) | 7W – 15W | 0.1 mΩ | 1 mΩ | ±0.1% … ±5% | ±15 – ±75 | LRS1575 / LRS5930 |
| LRS | 1050 (3920) | 5W – 12W | 0.1 mΩ | 1 mΩ | ±0.1% … ±5% | ±15 – ±75 | LRS1050 / LRS3920 |
Notes: Tolerance options and exact resistance ranges depend on the specific part variant—please consult the datasheet for exact values.
Electrical performance:
| Parameter | Value |
|---|---|
| Resistance Values (mR) | 0.1 to 4 |
| Rated Power (W) | 7 |
| Accuracy (%) | 0.5 to 5 |
| TCR (ppm/℃) | 25~50 |
| Operating Temperature Range | -50℃ ~ +170℃ |
| Inductance (nH) | <10 |
-
Typical Applications
- Power supply circuits
- Battery management systems (BMS)
- DC-DC converters
- Inverters and energy systems
- Industrial control electronics
- Widely used in compact electronic systems and high-efficiency power designs
The resistor follows standard current sensing principles widely used in electronic circuits.
For additional technical reference, see surface-mount technology and shunt resistor fundamentals
PCB Layout Guidelines (Optional)
Package 
Need a Custom SMD Shunt Resistor?
- Custom resistance values available
- Engineering support for your PCB design
- Fast sampling and production
