As foundational passive components, resistors play a critical role in current detection, voltage division, and circuit protection across electronic systems. ROHM Semiconductor, a leader in passive component technology, offers a comprehensive resistor portfolio covering shunt resistors, thick film resistors, and high-reliability variants. Leveraging proprietary metal plate and thick film processes, these products deliver industry-leading precision, high power density, and extreme environmental resilience—from automotive under-hood environments to industrial control systems. To secure genuine products, stable inventory, and professional technical support, partnering with ROHM’s authorized distributors is essential. Below is a complete guide to sourcing ROHM resistors via trusted channels.
Core Product Lines & Technical Advantages
ROHM’s resistor lineup is tailored to diverse precision and power needs, with three key series leading the market in performance for automotive, industrial, and consumer electronics applications:
1. Shunt Resistors (Current Detection)
Optimized for high-precision current detection in power circuits, these metal plate resistors combine ultra-low ohmic values, high power handling, and stable temperature characteristics:
PMR100 Series: A flagship shunt resistor series with newly expanded 5W models (0.5mΩ-1.5mΩ) in 6432-size (6.4mm×3.2mm) packaging. It achieves class-leading power density—2.5x higher than conventional 2W products and 1.7x higher than 3W variants—enabling miniaturization of motor control and power circuits. With an operating temperature range of -65℃~175℃, ±75ppm/℃ TCR, and 130℃ rated terminal temperature, it ensures stable current detection in extreme automotive and industrial environments <superscript:3superscript:5.
GMR Series: High-power shunt resistors (3W rated power) with a resistance range of 5mΩ-220mΩ. Optimized heat dissipation paths enable high reliability in compact form factors, making them ideal for battery protection circuits, LSI, and motor drive systems in automotive and consumer electronics <superscript:1superscript:5.
2. General-Purpose Thick Film Chip Resistors
Widely used in mainstream electronics, these resistors balance cost-effectiveness, miniaturization, and automotive-grade reliability:
MCR Series: AEC-Q200 qualified thick film chip resistors with metal-glaze resistive elements for high reliability. Available in package sizes from ultra-compact 0402 (1005) to 6432 (2512), the MCR10EZPF variant (2012-size) offers 0.125W rated power, 10Ω-2.2MΩ resistance range, and -55℃~155℃ operating temperature. It supports a 10-year product longevity program and RoHS compliance, making it a long-standing choice for automotive ECUs, consumer electronics, and industrial controls <superscript:4superscript:5.
MCRS/MCRL Series: New general-purpose thick film resistors with expanded production capacity and 20+ year supply guarantees. The MCRS series focuses on high-power compact designs, while the MCRL series caters to low-ohmic, high-power needs, ensuring stable supply for automotive and industrial long-cycle projects <superscript:4superscript:5.
3. High-Reliability Resistors
Engineered for harsh environments, these resistors feature anti-surge, anti-sulfuration, and high-voltage capabilities:
ESR/SDR Series: Anti-surge thick film resistors designed to withstand voltage spikes in industrial control systems and automotive electronics. The ESR series offers superior junction reliability, while the SDR series provides enhanced surge resistance, reducing failure risks in harsh electrical environments <superscript:2superscript:5.
SFR Series: Sulfurization-tolerant resistors that prevent performance degradation in sulfur-rich environments (e.g., industrial plants, automotive under-hood). Ideal for safety-critical applications like fire prevention equipment and traffic lights <superscript:5superscript:7.
Key Technological Advantages
Precision Temperature Stability: Advanced metal plate and thick film processes deliver low TCR values (down to ±75ppm/℃), ensuring consistent resistance values across extreme temperature fluctuations.
High Power Density: Proprietary packaging and heat dissipation design enable high rated power in compact footprints, supporting miniaturization of modern electronic circuits <superscript:3.
Automotive-Grade Compliance: AEC-Q200 qualification, anti-vibration, and anti-sulfuration features meet the strict reliability requirements of automotive electronics, from BMS to ECUs <superscript:4superscript:6.
Long-Term Supply Assurance: Extended product longevity programs (10-20 years) and expanded production capacity ensure stable supply for automotive and industrial long-cycle projects <superscript:4.
