CRH1206F680RP05Z 1206 680R 0.5W Ever Ohms Resistor Test Methods

1. Product Parameter Overview

The CRH1206F680RP05Z is a standard model in the CRH series of high-power thick film chip resistors manufactured by Ever Ohms (Tian Er Technology). The model code breaks down as follows: CRH designates the high-power thick film series; 1206 indicates the EIA imperial package size (metric 3216); F denotes ±1% resistance tolerance; 680R represents the nominal resistance of 680Ω; P05Z is the suffix code corresponding to 0.5W (1/2W) rated power.

Key electrical parameters include: rated power of 0.5W (continuous operation at 70℃ ambient), resistance tolerance of ±1%, temperature coefficient of resistance (TCR) of ±100ppm/℃, operating temperature range of -55℃ to +155℃, maximum working voltage of 200V, and compliance with RoHS (2011/65/EU) and REACH regulations. Compared to standard thick film resistors in the same 1206 footprint that typically offer only 0.25W, the CRH series doubles the power density through optimized thick film paste formulations and ceramic substrate thermal pathways without increasing PCB footprint.

2. Applicable Test Standards

Testing of the CRH1206F680RP05Z should reference the following standards: IEC 60115-1 (Fixed resistors for use in electronic equipment – Part 1: Generic specification) as the international general specification; GB/T 5729 as the Chinese national equivalent; and GB/T 9546 for surface mount fixed resistors. For automotive-grade or high-reliability applications, AEC-Q200 stress test qualification for passive components should be referenced.

3. Test Items and Procedures

3.1 DC Resistance Measurement

Use a high-precision LCR bridge (e.g., Keysight or Hioki) to measure resistance at a constant temperature of 25℃. For the 680Ω±1% specification, measured values should strictly fall between 673.2Ω and 686.8Ω. Four-wire (Kelvin) connection is recommended to eliminate lead resistance effects. For 1206 chip resistors, test probes should contact the backside of the electrodes to minimize contact resistance.

3.2 Temperature Coefficient of Resistance (TCR) Verification

Measure resistance at three temperature points: -55℃, 25℃, and +125℃, allowing thermal equilibrium at each point. Calculate TCR using the formula:

TCR (ppm/℃) = [(R₂ - R₁) / R₁] × [1 / (T₂ - T₁)] × 10⁶

where R₁ is the resistance at the 25℃ reference temperature and R₂ is the resistance at test temperature T₂. The TCR specification for the CRH1206F680RP05Z is ±100ppm/℃. This test is critical for verifying stability in wide-temperature environments.

3.3 Short-Time Overload Test

Apply 2.5 times the rated voltage for 2 seconds, then release the load and allow approximately 30 minutes for the sample to cool to room temperature before measuring resistance variance. The acceptance criterion is a resistance change rate not exceeding ±(1% + 0.05Ω).

3.4 High Temperature and High Humidity Load Test

Place samples in an 85℃/85% RH environment and apply rated voltage (or 10%–20% of rated power) for 1000 hours. This test primarily verifies moisture resistance and resistance to electrochemical migration. The resistance change rate after testing should be less than ±(1% + 0.05Ω).

3.5 High Temperature Storage Test

Store samples at 155℃ under no-load conditions for 1000 hours. This test assesses adhesion between the resistor paste and substrate, as well as oxidation resistance of the end electrode metal layer. Resistance change should remain within ±1%.

3.6 Appearance and Dimensional Inspection

Use an optical measurement system to verify that the 1206 package length, width, and thickness meet IPC standards. Focus on whether the end electrodes show oxidation, cracks, or defects, as these directly affect mechanical strength after soldering.

4. Testing Precautions

During measurement, test voltage should be kept as low as possible and energization time as short as possible to avoid self-heating effects that could shift resistance readings. Measurement power should be less than 10% of rated power to ensure accuracy is not affected by thermal effects. For batch incoming inspection, calculate CPK values to ensure process capability exceeds 1.33.

5. Authorized Distribution Channels

Ever Ohms maintains a comprehensive authorized distribution network in mainland China. Shenzhen Shunhai Technology Co., Ltd. has been an official Tier-1 authorized distributor since 2017, holding the 2026 annual distribution certificate (No. TW0202601E0000122), with full-series stock inventory, selection guidance, sample submission, and batch delivery management services, supported by a professional FAE team. HNST Mall, as an officially certified online authorized platform for Ever Ohms, has fully launched the complete product line, supporting both small-batch sampling and volume procurement through online ordering. Real-time inventory and price tier information for the CRH1206F680RP05Z is available on the platform, accommodating both R&D prototyping and mass production stocking needs.

Recommended similar products: