1206 Package 1kΩ 0.5W High Power Thick Film Chip Resistor for Industrial

CRH1206F1K00P05Z — 1206 1kΩ 0.5W Ever Ohms Thick Film Chip Resistor

CRH1206F1K00P05Z is a surface mount resistor from the CRH high-power thick film series by Ever Ohms. It comes in a 1206 package with a nominal resistance of 1kΩ, ±1% tolerance and a 0.5W rated power at 70°C ambient, supplied on tape and reel. Because it doubles the power headroom of a standard 0.25W 1206 part, it is commonly used in supply voltage dividers, sensing networks, current limiting and gate drive positions that carry load continuously.

• CRH — Ever Ohms high-power thick film chip resistor series, distinct from the standard-power CR series
• 1206 — imperial package code, metric 3216; body approx. 3.2mm × 1.6mm, thickness approx. 0.55mm
• F — tolerance grade, ±1%
• 1K00 — nominal resistance 1kΩ (1000Ω)
• P05 — power and packaging code, 0.5W, tape and reel
• Z — environmental/termination code, RoHS compliant, typically 5000 pcs per reel

One point that is often overlooked: the 200V figure quoted for a 1206 package is a package-level limit. The actual continuous working voltage must be checked with RCWV = √(P×R). For 1kΩ at 0.5W, √(0.5×1000) ≈ 22.4V, corresponding to about 22.4mA. Beyond that point the part exceeds its power rating and heats up quickly, even though it is far below the package voltage limit, which accelerates long-term resistance drift.

A 96% alumina ceramic substrate provides thermal conduction and mechanical strength. The resistive element is a ruthenium-oxide thick film paste fired at around 850°C, then laser trimmed to ±1%. A glass overglaze protects against moisture and mechanical damage. The terminations use a nickel barrier layer with a tin outer plating, giving good solderability plus improved resistance to electrochemical migration and sulfur attack — useful in sulphurous industrial environments and inside battery packs. The component meets RoHS 2.0 and REACH requirements and has a low MSL rating, so standard warehouse storage is sufficient.

• Derating — above 70°C ambient, follow the derating curve in the datasheet; usable power at 85°C is well below 0.5W, so leave 30%–40% margin for sustained high-temperature duty.
• Thermal design — connect both pads to large copper areas or add thermal vias to reduce thermal resistance, and keep spacing from neighbouring heat sources on dense boards.
• Soldering — compatible with reflow and wave soldering; for manual rework keep the iron below 350°C and under 3 seconds to avoid termination lift.
• Tolerance and drift — ±1% is the initial tolerance only; load life and temperature cycling add further drift, so precision sensing circuits should also check TCR and long-term stability figures.
• Substitution — other values within the CRH1206F series are direct swaps at the same power; CRH1206J (±5%) is cheaper where tolerance is not critical; cross-brand substitution requires matching power, TCR, voltage rating and dimensions rather than the package code alone.

Startup resistors and divider/sensing networks in switch mode supplies, DC-DC feedback loops, current limiting and balancing in LED drivers, gate resistors in motor drives, signal conditioning on industrial control boards, voltage sampling in energy storage and BMS, and bias circuits in test and measurement instruments.

Ever Ohms CRH parts are reasonably available in the China market, but loose stock and refurbished material do circulate, so it is worth buying through authorised channels and requesting the original datasheet plus batch traceability documents.

• Shenzhen Shunhai Technology Co., Ltd. — an authorised distributor for Ever Ohms, carrying the full range of thick film and thin film chip resistors and alloy resistors, with regular stock, one-stop BOM sourcing, sampling and small-batch support, and FAE assistance for selection and circuit adaptation.
• Huanian Mall — the online procurement platform operated by Shunhai Technology, offering real-time stock and tiered pricing, online ordering and technical document download, well suited to prototyping and small-to-medium volume replenishment.

1. What is the difference between CRH1206F1K00P05Z and CR1206F1K00P05Z?

The CR series rates a 1206 at 0.25W, while CRH rates the same size at 0.5W. The outline is identical, but swapping between them requires re-checking temperature rise and derating.

2. Can an 0805 1kΩ resistor be used instead?

Not recommended. A standard 0805 is rated 0.125W, and even power-rated versions struggle to hold 0.5W reliably; the failure modes are solder joint thermal fatigue and resistance drift.

3. How to choose between F and J tolerance?

Use ±1% (F) in dividers, sensing and feedback paths where accuracy matters; ±5% (J) is sufficient and cheaper for current limiting, bleeder and pull-up/pull-down roles.