I. Market Size: Global Growth and Domestic Opportunities
As a core category of current sensing precision resistors, the global market for SMD alloy resistors was estimated at RMB 5 billion in 2021 and is projected to reach RMB 7.4 billion by 2028, reflecting a Compound Annual Growth Rate (CAGR) of 5.5%. China's market is particularly prominent, with a size of approximately RMB 4.3 billion in 2021, accounting for 85.66% of the global total. It is expected to grow to RMB 6.4 billion by 2028, surpassing 86.6% of the global share.
In terms of specific segments, major demand drivers in 2021 included white goods, smartphone fast-charging adapters, and power tools. While emerging sectors like new energy vehicles and energy storage equipment currently represent a smaller share, they are experiencing significant growth rates.
Driven by increasing NEV penetration and deepening industrial automation, the share of automotive-grade and industrial-grade alloy resistors is expected to rise from 25% in 2021 to 40% by 2025, becoming a core growth pillar. Domestic companies have already broken foreign technological monopolies in areas like ultra-thin strip welding (0.1-0.3mm) and are leveraging the local market boom to accelerate import substitution and capture a share of the incremental market.
II. Technical Core: Differentiated Advantages of Electron Beam Welding
The core competitiveness of electron beam welded alloy resistors stems from the high-energy electron beam welding process conducted in a vacuum environment. This differentiates them from traditional electroplating processes, offering significant advantages in quality, performance, and cost.
Currently, leading domestic manufacturers achieve a yield rate of over 98% for products with thicknesses above 0.3mm using electron beam welding. The vacuum environment prevents impurity inclusion, resulting in superior resistance to current surge, a significantly lower Temperature Coefficient of Resistance (TCR), and reduced material consumption. Supported by localized technology, production costs are now comparable to traditional electroplated resistors.
FOSAN's electron beam welded alloy resistors can weld metal strips ranging from 0.1mm to 5mm, covering 0603 to 4527 package sizes. They adapt to a resistance range of 0.1mΩ to 200mΩ, handle power ratings from 0.25W to 36W, and operate in a wide temperature range of -55°C to +170°C, laying the foundation for applications in high-end fields.
Caption: Metal strip for electron beam welded alloy resistor
III. Domestic Breakthrough: FOSAN's Product and Technology Layout
As a significant player in the domestic alloy resistor field, FOSAN's subsidiary, Jiangxi Fuhe Electronics Technology Co., Ltd., has established a clear product matrix for electron beam welded alloy resistors.
Its electron beam welded resistor series include FCM, FSM, FCS, etc.:
The FCM series suits 2512~5930 packages, resistance 0.1~5mΩ, power 3~15W, with TCR as low as ±20ppm/℃, applicable for NEV powertrain systems.
The FCS series targets automotive scenarios, with resistance 0.035~0.5mΩ, power up to 36W, meeting current sensing requirements exceeding 100A.
Other series like FWK and FWKP offer highest precision up to ±0.1%, suitable for industrial servo drives, energy storage batteries, and similar applications.
Technologically, FOSAN possesses autonomous heat treatment technology for alloy materials, allowing customized TCR down to ±10ppm/℃. The electron beam welding process enables precise welding of bare chip structures, ensuring product power handling capability and stability.
IV. Application Scenarios: Comprehensive Coverage from Consumer Electronics to High-End Industry
Thanks to their high performance, electron beam welded alloy resistors have permeated numerous core applications across various fields.
Consumer Electronics: Used for current detection on battery protection boards and mainboards in 5G smartphone fast chargers and laptop power adapters. For instance, FOSAN's FPM/FRM series can meet the requirement of 2-3 pieces per unit.
New Energy Vehicles: The usage of alloy resistors per NEV is 5-8 times that of traditional internal combustion engine vehicles. FOSAN's FUS/FCS series are suitable for components like power battery BMS and OBC. Series like FPM/FCM are used in chassis control scenarios such as EPS and EPB.
Industrial & New Energy: Surging demand for high-power resistors in photovoltaic inverters and energy storage equipment. For example, FOSAN's FWK series, with 3-12W power ratings, can meet 100A continuous current detection and stringent temperature rise control requirements in residential energy storage battery systems. They also achieve import substitution in frequency converters and servo drive systems.
V. Competitive Landscape: Shifting Dynamics Amid Accelerated Import Substitution
The global market for electron beam welded alloy resistors was long dominated by companies like Isabellenhütte (Germany), Vishay (USA), and Yageo (Taiwan, China), due to high barriers related to core equipment and process technology.
In recent years, domestic companies have achieved breakthroughs through technological攻坚, gradually increasing their market share. FOSAN has performed notably – leveraging independent technological accumulation and localization advantages. It has not only mastered the core electron beam welding process but also obtained certifications like IATF 16949 and established its own AEC-Q200 compliant automotive-grade laboratory to ensure product quality. Its product performance is now comparable to international brands, actively contributing to the increased share of domestic electron beam welded alloy resistors in the mid-to-high-end market.
