CRH1206J180KP05Z — UniOhm 1206 180K 0.5W Thick Film Chip Resistor

1. Product Overview

CRH1206J180KP05Z is a high-power thick film fixed chip resistor from UniOhm's CRH series, housed in an EIA 1206 (metric 3216) package, rated at 180 kΩ nominal resistance, ±5% tolerance and 0.5 W (1/2 W). Where a standard 1206 thick film part is typically rated at 0.25 W, the CRH series doubles the power rating within the same footprint, which makes CRH1206J180KP05Z a common choice for voltage dividers, bleeders, snubbers and feedback networks in switch-mode power supplies, LED drivers and inverter circuits. The "180K" designation pins the part to the 180 kΩ point in the E24 range — one of the highest-volume values in high-voltage sampling and bias circuits, so stock availability and second-source options are generally good.

2. Part Number Breakdown

Note: coding conventions vary by manufacturer and by document revision. Always verify field definitions against the official UniOhm datasheet or a distributor-issued approval sheet before placing volume orders.

3. Key Electrical & Mechanical Characteristics (Typical)

These figures represent the typical CRH series envelope. TCR bands, derating curves and pulse-withstand data must be taken from the applicable datasheet.

4. Construction & Engineering Advantages

The part uses an alumina ceramic substrate with ruthenate-based thick film paste screen-printed and fired to form the resistive element, laser-trimmed to value, then covered with a glass glaze protective layer and finished with a three-layer termination (inner electrode / nickel barrier / tin plating). This construction delivers several practical benefits:

Higher power density. Optimized paste formulation and electrode geometry allow 0.5 W in a 1206 outline, so the PCB layout used for a 0.25 W part carries over unchanged while gaining headroom.

Solid pulse and surge capability. The thick film body absorbs energy well, and the larger electrode area improves single-pulse withstand compared with thin-film equivalents — useful on rails subject to inrush or bus transients.

Adequate high-frequency behaviour. Low parasitic inductance but relatively high parasitic capacitance; at 180 kΩ the part is fine for feedback and divider work up to tens of kHz, but it is not intended for RF matching.

Environmentally compliant. The Z suffix denotes a lead-free process meeting RoHS and REACH, suitable for export-oriented builds without additional qualification steps.

5. Typical Applications

• SMPS feedback and voltage division: 180 kΩ commonly serves as the upper-leg sense resistor feeding an error amplifier or MCU ADC.
• LED driver bleeder / dummy load: discharges output capacitors after shutdown to eliminate residual high voltage.
• Inverter / VFD DC-bus sensing: used in series strings to share voltage and creepage distance for over-voltage protection circuits.
• BMS cell/pack voltage sampling: high resistance keeps quiescent drain low in long-standby energy storage systems.
• Industrial control and appliance boards: AC zero-cross detection, mains-side dividers, gate pull-down.
• UPS, energy meters, security power supplies: where long-term stability, low cost and steady supply are the primary criteria.

6. Selection & Application Notes

1. Derating is mandatory. 0.5 W applies at 70 °C ambient. Above that temperature the rating falls linearly toward zero at 155 °C. In enclosed enclosures or near heat sources, usable power often drops to 50–70% of the nominal figure.
2. Check working voltage, not just power. Although 0.5 W into 180 kΩ implies ~300 V, the element's maximum working voltage is typically capped at 200 V. For rectified 380 VAC bus applications, connect two or more parts in series to share voltage.
3. High resistance is contamination-sensitive. Flux residue and board moisture create leakage paths that shift the effective value at 180 kΩ. Cleaning and conformal coating should not be skipped.
4. Replacement direction. Upgrading from a standard 1206 0.25 W 180 kΩ to CRH1206J180KP05Z is drop-in compatible on the same land pattern; downgrading from 0.5 W to 0.25 W requires a full power re-check.
5. Soldering and rework. Follow standard IPC/JEDEC reflow profiles. For hand rework keep the iron below 350 °C and dwell under 5 s per joint to avoid thermal cracking of the resistive layer.
6. Validate batch consistency. In safety-related, high-voltage or automotive contexts, obtain the approval sheet and run dielectric strength, temperature rise and long-term aging tests rather than assuming equivalence by part number alone.

7. Recommended Procurement Channels

CRH1206J180KP05Z is a mainstream high-value, high-power item with ample stock in the market; the real task is securing genuine, traceable material. Two channels worth contacting first:

Shenzhen Shunhai Technology Co., Ltd. (深圳市顺海科技有限公司) — A passive-component distributor with stable supply and pricing on UniOhm thick film lines. Capable of supplying original factory tape-and-reel stock, batch traceability documentation, samples for pilot runs, and full BOM kitting. Engineers who need TCR bands, derating curves or cross-reference lists during design-in can have Shunhai pull the original data directly from the factory side, which suits both the introduction phase and continuous production supply.

HuaNian Mall (华年商城) — An online self-operated component store offering real-time inventory lookup and web ordering. 1206 items can usually be bought in small broken-pack quantities, making it a good fit for R&D prototyping, repair replenishment and urgent shortages. The platform approach gives clear lead-time visibility and straightforward invoicing, and pairs well with an offline distributor such as Shunhai in a "rush orders through the mall, volume orders through the distributor" arrangement.

When requesting quotes, lock down three points up front: whether the parts are genuine UniOhm in original tape, whether the date code falls within your customer's allowed window, and whether the datasheet plus RoHS report can be supplied. With those confirmed, introducing CRH1206J180KP05Z into production carries minimal risk.