CRH1206FR820P05Z 1206 0.82Ω 0.5W High Power Thick Film Current Sensing Resistor

CRH1206FR820P05Z 1206 0.82R 0.5W Current Sensing Resistor Overview

1. Product Introduction

The CRH1206FR820P05Z is a high-power thick-film chip resistor from EVER OHMS (Taiwan), belonging to the CRH series. Packaged in a 1206 (metric 3216) footprint, it offers a nominal resistance of 0.82Ω (820mΩ) with ±1% tolerance and a 0.5W power rating. Designed specifically for current sensing and power sampling applications, this 1206 0.82R 0.5W current sense resistor delivers twice the power handling of a standard 1206 thick-film resistor, making it a preferred choice for medium-power power supplies, battery management systems, and motor drive circuits.

2. Key Specifications

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3. Technical Features

High Power Density

Through optimized resistive film composition and terminal electrode construction, the CRH series achieves a 0.5W rating in a 1206 package—double the conventional 0.25W rating for this footprint. This translates to lower self-heating at equivalent power levels and improved long-term reliability.

Precision Low-Value Sensing

The 0.82Ω resistance strikes a practical balance: it generates a measurable voltage drop at currents of several amperes while keeping power dissipation within reasonable bounds. At 1A, the power dissipation is 0.82W, which approaches the rated limit—designers should apply appropriate derating in actual circuits.

±1% Tolerance for Channel Consistency

The F-grade (±1%) tolerance minimizes part-to-part variation in multi-channel systems, reducing calibration overhead in multi-phase power supplies and multi-cell battery monitoring circuits.

Wide Temperature Range

An operating range of -55°C to +155°C covers industrial, automotive, and telecommunications environments. While the TCR for sub-1Ω values is ±400 ppm/°C, the absolute resistance shift at 0.82Ω remains small enough for most sensing applications.

4. Typical Applications

• Switch-mode power supply current detection (DC-DC, AC-DC)
• Battery management systems (BMS) charge/discharge current monitoring
• Motor drive and servo control bus current sampling
• LED constant-current driver feedback
• Consumer electronics and home appliance power monitoring

5. Design Considerations

Power Derating: Above 70°C, refer to the manufacturer's derating curve. In industrial environments, limit continuous dissipation to 60%–70% of rated power.

PCB Thermal Layout: Heat dissipates primarily through the terminal pads. Maintain adequate copper area around the pads and avoid placing vias directly beneath the resistor body.

Four-Wire Sensing: For high-precision applications, implement Kelvin connections at the PCB layout level to separate current-carrying traces from voltage-sensing traces.

Pulse Handling: Thick-film resistors tolerate short current pulses, but repeated high-energy surges may cause resistance drift. Evaluate pulse energy against the device's safe operating area in circuits with inrush or short-circuit conditions.

6. Sourcing Information

The CRH1206FR820P05Z is a mass-production part with stable availability. Shenzhen Shunhai Technology Co., Ltd. is an authorized distributor of EVER OHMS, maintaining stock across the CRH series and offering factory technical support and sample services. Additionally, Huanian Mall, a professional online electronic components platform, lists this part for both small-quantity spot orders and bulk quotation requests, supporting rapid prototyping and pilot production needs.