CRH1206F1R00P05S 1206 1R 0.5W Low TCR High Power Resistor
In switching power supply, motor drive, and lithium battery protection board designs, engineers often face a trade-off: limited PCB real estate must handle higher power dissipation while keeping resistance drift under control across temperature variations. The Ever Ohms CRH series high power thick film chip resistor addresses this challenge. The CRH1206F1R00P05S is the flagship 1Ω variant in the 1206 package.
Part Number Decoding
In CRH1206F1R00P05S, "CRH" denotes the Ever Ohms high power thick film chip resistor series, "1206" indicates the package size (metric 3216), "F" represents ±1% tolerance, "1R00" specifies the nominal resistance of 1Ω, and "P05" corresponds to the power and TCR specification combination.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Ever Ohms Technology |
| Package | 1206 (3.2mm×1.6mm) |
| Nominal Resistance | 1Ω (1R) |
| Tolerance | ±1% (F grade) |
| Rated Power | 0.5W (1/2W) |
| Temperature Coefficient | ±400ppm/℃ |
| Operating Temperature | -55℃ to +155℃ |
| Max Working Voltage | 200V |
| Max Overload Voltage | 400V |
| Compliance | RoHS and REACH |
Specifications are sourced from the product datasheet.
Power Density Advantage
The defining characteristic of the CRH1206F1R00P05S is its power density. A standard 1206 thick film resistor typically carries a 0.25W rating, while this part doubles that to 0.5W within the same footprint. For circuits where board space is tight but power margin is non-negotiable, this means designers can avoid upgrading to a 1210 or 2010 package to meet derating requirements.
1Ω Low Resistance with ±1% Tolerance
The 1Ω value plays a specific role in circuit design. When placed at a power supply output or in a MOSFET source path, its primary function is current sensing—measuring the voltage drop across the resistor to infer current flow. The ±1% tolerance keeps sampling variation manageable in volume production, reducing current detection errors caused by resistor deviation. With a 0.5W rating, the rated current at full power is approximately 0.707A (per P=I²R). In practice, operating current should be limited to 60–70% of the rated value to preserve overload margin.
What ±400ppm/℃ Means in Practice
The temperature coefficient of ±400ppm/℃ translates to a resistance shift of approximately ±2.5% across the -55℃ to +155℃ range (referenced to 25℃). For current limiting, bleeder, and dummy load applications where precision is not critical, this drift level is acceptable. For designs demanding tighter current sensing accuracy, lower TCR precision resistors or metal alloy current sense resistors should be considered.
Typical Applications
SMPS Input/Output Current Limiting: In DC-DC converters or AC-DC modules, a 1Ω resistor can be placed in series with the rectified DC bus to limit inrush current during startup. The 0.5W rating allows the resistor to withstand short-duration overload during surge events without damage.
MOSFET Gate Bleeder Circuit: In gate drive circuits for power MOSFETs, a 1Ω resistor is commonly used as a series gate resistor and bleeder, suppressing gate oscillation and accelerating charge discharge during turn-off. The low resistance combined with high power rating handles transient currents during gate capacitor charging and discharging.
Li-Ion Battery Protection Board Balancing and Sensing: In lithium battery pack protection boards, the 1Ω resistor can serve as a current limiter in balancing circuits or as a current sense element in charging paths. The ±1% tolerance provides a consistent detection reference for protection ICs.
RC Snubber Circuits: Combined with a capacitor between the switching node and ground, the resistor forms an RC snubber to suppress voltage spikes. This application demands short-time overload capability and long-term stability, both of which the thick film construction of the CRH series delivers.
Where to Buy
The CRH1206F1R00P05S is available through the following authorized Ever Ohms distribution channels, ensuring genuine product sourcing and technical support:
Shenzhen Shunhai Technology Co., Ltd. is Ever Ohms' core tier-one authorized distributor in mainland China, with a partnership dating back to 2017. The company holds a valid Ever Ohms annual authorization certificate (No. TW0202601E0000122, valid through 2026). Shunhai Technology carries the full Ever Ohms current sense resistor and chip resistor portfolio, maintains an inventory exceeding 50 million pieces, supports small-batch orders starting from 10 pieces, and provides free selection guidance through its FAE team.
Huanian Mall (www.hnstshop.com) is Ever Ohms' officially certified online authorized distributor, with the complete high power resistor portfolio listed on its platform. The platform offers online part selection, real-time inventory lookup, price comparison tools, and datasheet downloads—well suited for R&D-stage small-batch procurement and urgent replenishment. Huanian Mall and Shunhai Technology are affiliated companies that together form Ever Ohms' complete authorized distribution network in mainland China.
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