SMD Current Sense Resistor for PCB Current Sensing
- Rated Power: Up to 5W
- Low resistance values: 0.2mΩ ~ 5mΩ
- Excellent stability and heat dissipation
- Solderable SMD construction, RoHS compliant
Description
Overview
SMD Current Sense Resistor for Precision PCB Current Measurement
An SMD current sense resistor, also known as a surface mount shunt resistor, is designed for accurate current monitoring in compact PCB applications. By measuring the voltage drop across a precisely controlled low resistance element, it enables reliable current detection and circuit protection.
Designed with a metal alloy sensing element, this low resistance SMD shunt resistor provides excellent thermal stability, low TCR performance, and consistent electrical characteristics under continuous operation.
The open-type structure improves heat dissipation through natural convection, reducing thermal stress in high-current power circuits. It is widely used in BMS, power supplies, DC/DC converters, motor control systems, and industrial electronics requiring accurate PCB current sensing.
Key Features of SMD Current Sense Resistor
- Low Resistance for Accurate Current Sensing
Provides precise voltage drop measurement for PCB current monitoring applications. - Metal Alloy Sensing Element
Delivers stable resistance performance, excellent conductivity, and reliable long-term operation. - Low Temperature Coefficient (TCR)
Minimizes resistance drift caused by temperature changes, improving measurement accuracy. - Efficient Thermal Management
Open-type construction improves heat dissipation during continuous high-current operation. - Compact SMD Package for PCB Integration
Supports space-saving surface mount designs and standard SMT assembly processes. - Stable Performance Under High Current Loads
Suitable for power supplies, BMS, DC/DC converters, and industrial electronics.
Technical Specifications – Chip Current Sense Shunt 3920
| Power (W) | Material Size | B (mm) | W (mm) | A (mm) | C (mm) | H (mm) | D1 (mm) | D2 (mm) | Resistance Value (mΩ) |
|---|---|---|---|---|---|---|---|---|---|
| 3 | M2512 | 3.0±0.3 | 6.3±0.2 | 1.2±0.2 | 3.1±0.3 | 0.5±0.1 | 1.5 | 1.5 | 0.3 |
| 0.88 | |||||||||
| 0.5 | |||||||||
| 5 | M3920 | 4.5±0.3 | 10±0.2 | 2.2±0.2 | 5.1±0.4 | 0.5±0.1 | 1.5 | 1.5 | 0.2 |
| 1.37 | |||||||||
| 0.3 | |||||||||
| 0.83 | |||||||||
| 7 | M5930 | 5.0±0.3 | 15±0.3 | 4.2±0.3 | 7.6±0.4 | 0.5±0.1 | 1.5 | 1.5 | 0.2 |
| 0.75 | |||||||||
| 0.4 | |||||||||
| 0.6 |
Common Challenges in PCB Current Sensing Applications
- Measurement errors under high current loads
Incorrect resistance selection or unstable components can affect voltage drop accuracy and current feedback. - Resistance drift caused by temperature variation
Heat generated during operation may change resistance values and reduce measurement reliability. - Limited PCB space for power components
Compact electronic designs require small-footprint current sensing solutions without sacrificing performance. - Thermal stress during continuous operation
Poor heat dissipation can reduce component lifetime and system stability.
How Our SMD Current Sense Resistor Solves These Challenges
- Low resistance design for accurate current measurement
Provides a stable voltage drop signal for precise current monitoring. - Metal alloy construction for better stability
Reduces resistance drift and maintains reliable performance under temperature variations. - Compact SMD package for space-saving PCB layouts
Enables efficient integration into power modules and compact electronic systems. - Optimized thermal performance
Open-type structure improves heat dissipation during continuous current operation.
Applications of SMD Current Sense Resistors
SMD current sense resistors are widely used in:
- Battery Management Systems (BMS)
Current monitoring for battery charging and discharging control. - Switching Power Supplies and DC/DC Converters
Accurate current feedback and power management. - Industrial Automation and Control Systems
Current detection and protection in electronic control circuits. - Variable Frequency Drives (VFDs)
Current monitoring in motor control applications. - Renewable Energy Systems
Current measurement in solar inverters and energy storage equipment.
Custom SMD Current Sense Resistor Solutions
We provide customized SMD current sense resistors with flexible options for:
- Resistance values
- Power ratings
- Package sizes
- Terminal designs
Contact our engineering team for sample evaluation and customized solutions.
FAQ
What is an SMD Current Sense Resistor?
An SMD current sense resistor is a surface mount component designed to measure current by detecting the voltage drop across a low resistance element.
How is an SMD current sense resistor different from a standard chip resistor?
Unlike standard chip resistors, SMD current sense resistors are optimized for accurate current measurement with low resistance values, stable TCR performance, and better thermal characteristics.
How do I choose the right SMD current sense resistor?
Selection depends on resistance value, current rating, power dissipation, tolerance, TCR, package size, and thermal requirements.
