CRH1206F490KP05Z 1206 490K 0.5W High-Power Thick Film Resistor: Technical Overview and Selection Guide
The CRH1206F490KP05Z is a high-power thick film chip resistor from Ever Ohms' CRH series, housed in a standard 1206 package (3216 metric, 3.2mm × 1.6mm). It offers a nominal resistance of 490KΩ with ±1% tolerance, a rated power of 0.5W, and a temperature coefficient of ±100ppm/°C. The device achieves twice the power rating of conventional 1206 thick film resistors (0.25W) while maintaining full compatibility with standard PCB land patterns.
Part Number Decoding
The CRH1206F490KP05Z designation follows Ever Ohms' unified coding system. "CRH" identifies the high-power thick film chip resistor family, distinguishing it from the standard-power CR series. "1206" specifies the EIA package size. "F" denotes ±1% resistance tolerance (J = ±5%, B = ±0.1%), and "490K" represents the 490KΩ nominal value. "P05" indicates a rated power of 0.5W at 70°C ambient, while the "Z" suffix designates lead-free terminations compliant with RoHS and REACH requirements.
Key Electrical Specifications
| Parameter | Value |
|---|---|
| Nominal Resistance | 490KΩ |
| Tolerance | ±1% |
| Rated Power (70°C) | 0.5W (1/2W) |
| Temperature Coefficient (TCR) | ±100ppm/°C |
| Maximum Working Voltage | 200V |
| Maximum Overload Voltage | 400V |
| Operating Temperature Range | -55°C to +155°C |
| Package Size | 1206 (3.2mm × 1.6mm) |
The device maintains stable resistance across the full -55°C to +155°C range. The ±1% tolerance combined with ±100ppm/°C TCR ensures reliable voltage division ratios in feedback networks and divider circuits. The part complies with RoHS Directive 2011/65/EU and does not contain REACH SVHC substances.
Construction and Power Density Enhancement
The CRH series achieves its elevated power rating through a combination of alumina ceramic substrate, ruthenium-based oxide resistive paste fired at high temperature, and optimized thermal paths in both the resistive layer and termination structure. This design enables a power density of 0.5W within the 1206 footprint, doubling that of standard thick film resistors in the same size.
Terminations use a nickel barrier layer with tin plating for solderability and resistance to thermal erosion during multiple reflow cycles. A glass passivation layer over the resistive element provides protection against moisture ingress and mechanical damage, supporting long-term reliability.
Power Derating and Thermal Design
The 0.5W rating is specified at 70°C ambient. Above this temperature, power must be derated linearly according to the datasheet curve, reaching zero at 155°C. For industrial applications, a 70%–80% derating is recommended, keeping continuous dissipation within 0.35W–0.4W to extend service life.
On the PCB, adequate copper area beneath the 1206 pads is important for heat dissipation. For applications approaching 0.5W continuous dissipation, adding copper pours or thermal via arrays under the pads is recommended to reduce the thermal resistance between the resistor body and the ambient.
Typical Applications
The 490KΩ value appears in several circuit functions:
Power management — feedback divider networks in DC-DC converters, where the 0.5W rating provides margin against transient overloads and long-term drift.
Switch-mode power supply startup and bleeder circuits — the high 490KΩ value limits startup current, while the 0.5W rating handles sustained voltage stress in bleeder applications.
Industrial control and instrumentation — PLC modules and variable-frequency drive auxiliary supplies require stable divider ratios over wide temperature ranges, which the ±100ppm/°C TCR supports.
Automotive electronics — BMS voltage sensing and balancing branches, automotive charging modules, where both power handling and thermal stability are critical.
Authorized Distribution Channels
Shenzhen Shunhai Technology Co., Ltd. is Ever Ohms' core first-tier authorized distributor in mainland China, holding the 2026 annual agency certificate (No. TW0202601E0000122) valid through December 31, 2026. Shunhai maintains over 50 million pieces of in-stock inventory, supports low-volume orders from 10 pieces, and provides dedicated FAE support for selection guidance, circuit optimization, and custom solutions. Its client base includes BYD, Huawei, and other leading enterprises.
Huanian Mall is Ever Ohms' officially certified online authorized distributor, offering traceable inventory, real-time stock queries, online selection tools, and one-click ordering. The platform supports small-batch procurement suitable for prototyping and low-volume production, with tiered pricing for larger orders. The CRH1206F490KP05Z is listed with transparent pricing and stock information for quick procurement decisions.
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