ROHM, as a globally renowned semiconductor and electronic component manufacturer, has been deeply involved in the field of resistance technology for many years. Its products have innovative materials, precision processes, and excellent reliability as their core advantages. The core competitiveness of ROHM resistors is systematically analyzed from three dimensions: technical characteristics, application adaptability, and industry contribution
1、 Innovation in Materials and Processes
Low resistance thick film technology
ROHM's low resistance thick film surface mount resistors (such as 0402/0603 packages) use advanced thick film technology, with resistance values ranging from milliohms to tens of ohms. They have low contact resistance (reducing energy loss) and low temperature drift coefficient (below ± 100ppm/℃), ensuring current detection accuracy and temperature stability. They are suitable for high-density circuits such as smartphone power management and wearable device sensor interfaces.
Ultra thin design of metal plate shunt resistor
The representative product PSR series (such as PSR350) achieves an ultra-thin thickness of 0.85mm (50% thinner than traditional products) and a high power density of 12W-15W by optimizing welding materials and structures. It is compatible with double-sided heat dissipation power modules for vehicles (such as main drive inverters), solving the contradiction between heat dissipation and space.
Anti sulfurization electrode technology
For sulfur-containing environments such as industrial waste gas and humid salt spray, the SFR series resistors use non silver electrode materials and protective coatings to significantly suppress resistance drift caused by sulfurization and extend the life of vehicle electronic and base station equipment.
2、 Advantages of Thermal Management and Reliability
High temperature stability
High voltage thin-film surface mount resistors maintain a resistance change rate of less than 1% over a wide temperature range of 55 ℃ to+155 ℃. Low thermal resistance packaging (such as PSR330) combined with double-sided heat dissipation design ensures that the EV battery management system (BMS) accurately samples current at high temperatures in the engine compartment.
Mechanical and Environmental Tolerance
Through anti humidity, anti vibration, and thermal shock testing (compliant with AECQ200), thick film resistors have reduced their failure rate by 40% in high-frequency vibration scenarios of electric tools, supporting industrial equipment for a service life of more than 10 years.
3、 Breakthrough in packaging and miniaturization
High density integration capability
Small package: 0201 size chip resistors meet the space compression requirements of new energy vehicle circuit boards, reducing board area by 70% compared to general models.
Optimization of power to volume ratio: PSR330 achieves 15W power in a 6.4mm × 6.4mm package, reducing the size by 65% compared to similar products and directly reducing the size of the inverter module.
Compatibility of automated production
Standardized packaging (such as 0805, SOT23) with strict dimensional tolerances (± 0.1mm), supports high-speed surface mount machine soldering, and improves the yield rate of consumer electronics production lines to over 99.5%.
4、 Special scenario adaptability
|Application scenarios | Product series | Key technological advantages | Performance improvement effects|
|Vehicle high current detection | PSR100 metal plate resistor | Resistance as low as 0.2m Ω | Current detection loss ↓ 30%, supports 800A system|
|High frequency communication equipment | High voltage thin film resistor | Noise coefficient<0.1 μ V/V | Signal distortion rate reduced by 50%|
|Corrosion resistant environment | SFR sulfurization resistance | Silver free electrode structure | Three times longer sulfurization failure cycle|
|SiC inverter integration | PSR350 ultra-thin resistor | 0.85mm thickness compatible with double-sided heat dissipation module | Main drive inverter volume reduced by 40%|
5、 Application performance
Energy efficiency improvement
The ultra-low resistance design (0.2m Ω -0.3m Ω) of current sampling resistors (such as PSR100) controls power loss below 0.1W, helping to increase electric vehicle range by 6% (WLTC standard).
Signal integrity assurance
The low noise characteristics of thin film resistors (<-35dB) optimize the signal-to-noise ratio of audio equipment, while the anti-interference ability of high-voltage models (>200V) meets the EMC requirements of ADAS radar modules.
6、 Empowering vertical production systems
ROHM utilizes a vertically integrated manufacturing chain (with controllable design, materials, and packaging processes) to achieve rapid trial production and process iteration in small batches
For example, the PSR series customizes welding materials through a Thai base, reducing the development cycle by 30% and supporting customer customization needs (such as 0.2m Ω resistor expansion).
ROHM resistors are reconstructing industry standards with material innovation (thick film/metal plate/non silver electrode), extreme packaging (ultra-thin/miniaturized), and scenario based reliability (sulfur resistance/wide temperature range), covering the full spectrum of requirements from consumer electronics to xEV power systems. Its technological barriers are not only reflected in leading parameters, but also in the continuous breakthrough of the "efficient, reliable, and miniaturized" triangle contradiction, becoming the fundamental pillar of electronic systems in the era of electrification and intelligence.