Low resistance shunt resistors are core components in current detection circuits, widely used in automotive electronics, industrial power supplies, battery management, and other scenarios. The following are outstanding brands and their representative product lines in the market, which are comprehensively organized based on their technical characteristics and market applications:
1、 International comprehensive electronics manufacturer
ROHM (ROHM Semiconductor)
Product series:
GMR series: featuring high power density, such as GMR 320 (10W, resistance 5m Ω -100m Ω), with a surface temperature rise 23% lower than ordinary products, supporting wide temperature operation from 65 ° C to+175 ° C, suitable for vehicle ECU and industrial motor drive.
PSR series: ultra-low resistance (0.1m Ω -3.0m Ω), rated power extended to 15W, improved thermal stability through pin temperature derating technology, used in electric compressors, DC/DC converters, etc.
PMR series: miniaturization design, such as PMR100 (6432 size, 5W, 0.5m Ω -1.5m Ω), TCR as low as ± 75ppm/° C, suitable for high-density PCB layout.
Technical advantages: independent alloy materials, AECQ200 certification, providing thermal simulation models to support design optimization.
TT Electronics
Product series:
LRF4W: Thick film process, resistance 3-100m Ω, TCR as low as 100ppm/° C, withstand 100% overcurrent for 5 seconds, certified by AECQ200, designed specifically for battery management and motor control.
Features: Adopting "anti format" packaging (1225 size) to improve power density and heat dissipation efficiency.
Littelfuse
Product series:
SSA series: Metal shunt resistor, resistance 0.2-4.0m Ω, power up to 15W, suitable for industrial high-power scenarios such as power modules and inverters.
Advantages: High cost-effectiveness, compatible with AC/DC applications.
3、 Brand in the field of testing and measurement
IET Labs
Product series:
DCCS series: Calibration grade shunt, resistance of 100 μ Ω -1k Ω, accuracy of 0.02%, oil filled design ensures long-term stability, used for high-precision current calibration.
Positioning: Non circuit board level applications, focusing on laboratory and production line calibration.
Comparison of Key Parameters of Mainstream Brands
|Brand | Representative Series | Resistance Range | Rated Power | TCR Level | Main Application Fields|
|ROHM | GMR320 | 5m Ω -100m Ω | 10W | ± 25ppm/° C | Vehicle mounted ECU, industrial power supply|
|ROHM | PSR500 | 0.1m Ω -3.0m Ω | 15W | ± 50ppm/° C | Electric tools, DC/DC converters|
|TT Electronics | LRF4W | 3m Ω -100m Ω | 4W | 100ppm/° C | Battery Management, Motor Control|
|Littelfuse | SSA | 0.2m Ω -4.0m Ω | 15W | Unpublished | Industrial power supply, inverter|
Selection suggestions
In car/high temperature scenarios: ROHM (GMR/PSR) or TT Electronics (LRF4W) are preferred, supporting AECQ200 and high temperature resistance.
Ultra low resistance requirement (<5m Ω): ROHM PSR series or Littelfuse SSA series provide better power density.
High precision current sampling: The four terminal structure of Dekey LPS can reduce contact resistance errors.
Calibration and laboratory use: The IET Labs DCCS series is a professional grade choice.
The future trend focuses on higher power density (such as ROHM PMR100 achieving 5W in 6.4mm × 3.2mm size) and lower TCR (ROHM GMR reaching ± 25ppm/° C), promoting the evolution of electric vehicles and server power supplies towards miniaturization and high reliability.