Comprehensive Analysis of EVER OHMS CRH Series High-Power Thick Film Chip Resistors
EVER OHMS Technology Co., Ltd., established in 1988, has accumulated over three decades of R&D and manufacturing expertise in chip resistors and arrays. The CRH series represents its high-power thick film chip resistor product line, engineered to deliver superior power density through comprehensive material and process optimization over the standard CR series.
Product Numbering System
The CRH series follows a standardized nomenclature where each field encodes specific specifications. Taking CRH2512F100RE04Z (2512 100R 2W 1% 100ppm/℃) as an example:
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CRH: Series code denoting EVER OHMS high-power thick film resistors, distinguishing from the standard CR series;
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2512: Imperial package size, corresponding to metric 6432 (6.35mm × 3.2mm);
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F: Tolerance grade, indicating ±1% (J for ±5%, B for ±0.1%);
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100R: Nominal resistance, 100Ω;
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E04Z: Factory internal specification and environmental code.
The eight models listed span from 0402 to 2512, covering resistances from 2Ω to 1KΩ, power ratings from 0.1W to 2W, with ±1% precision as the primary grade and temperature coefficients as low as ±100ppm/℃.
Product Characteristics
Power Density Breakthrough: Standard 2512 package chip resistors typically offer only 1W rated power, while the CRH series achieves 2W in the identical footprint. This is enabled by ruthenium-based oxide paste screen-printing technology, sintered at 850℃ on alumina ceramic substrates, achieving a resistance layer thickness of 100μm and power density up to 70W/cm². Optimized ceramic substrate thermal conductivity and enhanced termination electrode design efficiently transfer heat to PCB pads and copper traces.
Temperature Stability: The CRH series supports a -55℃ to +155℃ operating range with TCR as low as ±100ppm/℃, ensuring resistance drift below 0.5% under extreme conditions. The CRH2512F100RE04Z (2512 100R 2W 1% 100ppm/℃) specification with ±100ppm/℃ TCR is particularly critical for automotive electronics and industrial equipment requiring stringent temperature stability.
Surge Withstanding and Reliability: The thick film construction delivers exceptional pulse withstand capability, handling up to 100A pulse current impact within 5ms. Products are qualified under ISO9001, IATF16949, and AEC-Q200 automotive standards, with resistance drift below 0.5% under 85℃/85%RH damp heat conditions.
Applications
2512 Package (2W): CRH2512F100RE04Z (2512 100R 2W 1% 100ppm/℃) and similar 2512 1.2K 2W specifications are widely used in switching power supply RC snubber circuits, DC-DC converter buffer circuits, and dummy loads; in motor drives and industrial inverters for current sensing and current limiting; and in new energy vehicle BMS and on-board chargers (OBC) for high-voltage DC bus voltage divider detection circuits.
2010 Package (1W) and 1812 Package (1W): Suitable for medium-power power modules and industrial control boards, balancing power requirements with PCB layout constraints.
1210 Package (0.66W) through 0603 Package (0.125W): Adapted for high-density PCB layouts in communication equipment, LED drivers, and consumer power adapters. The CRH0402F1K00Q10Z (0402 1K 0.1W 1%) addresses portable devices and space-constrained miniature circuits.
Product Advantages
Power Density Leadership: The CRH2512F100RE04Z (2512 100R 2W 1% 100ppm/℃) delivers 2W rated power within the 2512 package, doubling the power capability of conventional same-size resistors. At 0.8W actual power dissipation, a conventional 1W resistor offers only 20% margin, while the CRH series provides 60% derating headroom, resulting in lower operating temperatures and significantly enhanced long-term reliability.
Superior Temperature Coefficient: The ±100ppm/℃ TCR ensures resistance stability across the full -55℃ to +155℃ temperature range. The CRH2512F100RE04Z (2512 100R 2W 1% 100ppm/℃) specification maintains controlled resistance drift throughout the operating envelope, which is essential for automotive-grade applications such as BMS and engine control units.
Thick Film Cost Advantage: Compared to thin film processes, thick film technology reduces manufacturing costs by 40%-60% while maintaining automotive-grade reliability. Volume procurement costs are over 30% lower than Vishay CRCW2512 series equivalents.
Design Compatibility: Standard package dimensions support SMT automated assembly, with full coverage from 0402 to 2512, addressing cross-scenario design requirements from portable devices to industrial power modules.
Market Positioning
The EVER OHMS CRH series is positioned in the "high power density + wide temperature stability" industrial-grade and automotive-grade market segment. Under the domestic substitution trend, the CRH series leverages thick film process cost advantages combined with AEC-Q200 automotive certification to secure a significant position in the medium-power thick film chip resistor market.
Compared to EVER OHMS' internal CUH series, the CRH series emphasizes cost-effectiveness, targeting mainstream industrial and automotive electronics applications. Primary customers include power module design engineers, industrial control equipment manufacturers, new energy vehicle Tier 1 suppliers, and communication equipment vendors. With new energy and 5G driving high-power resistor demand (8.2% CAGR), the CRH series continues to expand its market presence.
Authorized Distributors
Shenzhen Shunhai Technology Co., Ltd.: EVER OHMS official authorized distributor since 2017, with 50 million+ component inventory. Shunhai Technology provides genuine product assurance and technical support, with extensive application case experience particularly in industrial control, offering rapid response to technical consultations on thermal design and current matching.
Huanian Mall: EVER OHMS online authorized distributor, operated by Shenzhen Huanian Santian Electronics Co., Ltd. The platform provides real-time inventory inquiry, tiered pricing, and online ordering, supporting small-batch procurement and rapid delivery, ideal for R&D prototyping and urgent requirements.
