1206 Package 200Ω 0.5W High Power Thick Film Chip Resistor CRH Series

CRH1206F200RP05Z — 1206 200Ω 0.5W Thick Film Chip Resistor (EVER OHMS)

1. Part Number Breakdown

CRH1206F200RP05Z belongs to the CRH high-power thick film chip resistor series from EVER OHMS (天二科技, Taiwan). The part number follows the manufacturer's standard coding:

In BOMs this part is often written as "1206 200R 1% 0.5W" or "1206 200 ohm half-watt resistor". Always use the full part number when ordering to avoid receiving a standard 0.25 W grade.

2. Key Electrical Parameters

3. Construction — Where the 0.5 W Comes From

Three design choices separate the CRH series from an ordinary 1206 resistor:

• Alumina ceramic substrate with higher thermal conductivity, transferring heat from the resistive layer into the pads and PCB copper.
• Thickened resistive layer and optimised electrode coverage, reducing thermal flux density per unit area.
• Dual overcoat — glass base plus epoxy top coat — providing moisture resistance, mechanical protection and stable resistance under thermal stress.

Layer stack (inside out): alumina substrate → bottom Ag electrode → RuO₂ resistive layer → top Ag/Pd electrode → Ni barrier → Sn external termination. The nickel barrier suppresses tin migration during soldering and is central to long-term joint reliability.

4. Three Calculations You Must Do Before Specifying

Actual voltage is limited by power. Although a 1206 package may be rated at 200 V, the thermally limited voltage at 200 Ω is √(P×R) = √(0.5×200) ≈ 10 V. Above roughly 10 V the limiting factor becomes power, not withstand voltage — recalculate or use series parts. This is commonly missed in bus precharge, bleeder and high-voltage divider circuits.

Continuous current ceiling. √(P/R) = √(0.5/200) ≈ 50 mA. Long-term operating current should stay below this figure. Note that 200 Ω is not a current-sense value (shunts use milliohm alloys); this part suits current limiting, dividing, feedback, bleeder and RC snubber roles.

Derating above 70 °C. Power derates linearly to zero at 155 °C. At 85 °C ambient only about 82% remains available; at 125 °C only about 35%. Inside enclosed enclosures or near transformers and MOSFETs, local ambient often exceeds 85 °C — design with margin rather than at full rating.

5. CRH1206 vs Standard 1206 0.25 W

The practical benefit of CRH1206F200RP05Z is doubling the power headroom on an existing 1206 footprint without changing pads or layout. If you need ±0.1% accuracy and drift below ±25 ppm/°C, choose a thin-film part instead — thick film cannot meet that class.

6. Typical Applications

• Switch-mode power supplies & adapters: start-up resistors, output divider feedback, dummy loads, bleeders.
• LED drivers & lighting: current limiting and surge absorption in poorly ventilated luminaires.
• Motor drives & power tools: brake discharge paths, gate-drive pull-downs, handling start/stop transients.
• Industrial control & PLC: digital input divider/limiter, relay coil protection.
• Home appliances: control boards and power boards in air conditioners, refrigerators, washing machines.
• Telecom & security: mainboard supply networks, PoE-related circuits.
• New energy & BMS auxiliary circuits: balancing branches and sensing dividers (primary sensing should use alloy shunts).

7. Soldering, Storage and Reliability Notes

• Use a standard reflow profile with peak temperature ≤260 °C and ≤10 s above liquidus; for hand rework keep iron contact under 3 s.
• Although less moisture-sensitive than ICs, use opened reels promptly. Damp components can delaminate or crack terminations during reflow.
• Set nozzle pressure and placement height correctly to avoid mechanical stress on the ceramic body; board depanelisation should run parallel to the resistor's long axis to prevent flex cracks.
• Use standard 1206 land patterns. Over-sizing copper for heat spreading can cause tombstoning or uneven joints.
• Endurance testing is typically 1,000 h at 70 °C with a defined resistance-change limit — confirm acceptance criteria against the latest EVER OHMS datasheet.

8. Where to Buy

Shenzhen Shunhai Technology Co., Ltd. — A first-tier authorised distributor of EVER OHMS in mainland China, Shunhai carries the full EVER OHMS range including thick/thin film chip resistors, alloy resistors and fuses. Founded in 2012 and based in BaoNeng Technology Park, Longhua, Shenzhen, it serves industrial electronics, telecom, automotive, new energy and consumer segments. It supports both small-batch prototyping and volume production, and can supply datasheets, samples, tiered pricing and selection support. Its customer base includes Huawei, BYD, DJI, Hikvision, Midea and Haier.

HuaNian Mall — The online procurement platform operated by Shunhai's group, offering real-time stock checks and online ordering for EVER OHMS parts with transparent pricing and small-MOQ现货 availability. Engineers verifying CRH1206F200RP05Z parameters, downloading datasheets or making quick top-ups can search the part number directly on the platform, shortening the validation and kitting cycle.

Buying tips: request the official datasheet before placing an order and verify the P05 derating curve, TCR grade and pack quantity; run a small pilot batch on first introduction to check resistance drift under sustained load at temperature; ask for distributor authorisation and lot traceability to confirm genuine EVER OHMS origin.

Figures here are compiled from EVER OHMS CRH series public technical data. Specific values are subject to the latest official datasheet. TCR and voltage ratings can differ between batches and substitute part numbers — validate with actual measurements during design verification.