CRH1206F27K0P05Z 1206 27kΩ 0.5W High Power Thick Film Chip Resistor with ±1%

CRH1206F27K0P05Z | 1206 27K 0.5W Ever Ohms Resistor — Full Parameter Guide

1. Part Number Decoding

CRH1206F27K0P05Z is the complete order code of EVER OHMS (天二科技) CRH series high-power thick film chip resistor, commonly referred to as "1206 27K 0.5W Ever Ohms resistor".

A BOM entry reading only "1206 27k 1/2W" risks being supplied as ±5% CRH1206J27K0P05Z or substituted with a 0.25W CR1206 part. Always specify the full part number.

2. Key Electrical Parameters

• Nominal resistance: 27kΩ (26.73kΩ–27.27kΩ at ±1%)
• Rated power: 0.5W @70°C — twice that of a standard 1206 thick film resistor (0.25W)
• Max. working voltage: 200V; short-time overload voltage 400V
• TCR: ±100ppm/°C (mid-to-high resistance range)
• Operating temperature: −55°C to +155°C
• Insulation resistance: ≥10GΩ
• Dimensions: approx. 3.20 * 1.60 * 0.55mm
• Construction: 96% alumina substrate + RuO₂ thick film resistor layer + glass glaze overcoat; Ni barrier / Sn outer termination
• Packaging: tape & reel, typically 5000pcs/reel, compatible with high-speed SMT lines
• Compliance: RoHS, halogen-free

Note on voltage: √(0.5W * 27kΩ) ≈ 116V, which is below the 200V device limit. Power, not voltage, is the limiting factor here. For AC input sides or high-voltage buses, choose EVER OHMS HR or other high-voltage series instead.

3. How 0.5W Is Achieved in a 1206 Footprint

Power doubling comes from three design measures: a 96% alumina substrate with higher thermal conductivity for faster heat transfer to the terminations and PCB copper; reformulated ruthenium-based paste and adjusted laser-trim geometry to reduce local current density and avoid hot spots; and a densified glass glaze layer that improves moisture resistance and surface heat uniformity.

Derating remains mandatory. The 0.5W rating assumes a 70°C ambient; above that, apply the derating curve. At 125°C ambient, limit steady-state dissipation to roughly 60% of rated (≈0.3W). In layout, place copper pours and thermal vias under the pads, and keep spacing from other heat-generating components.

4. Reliability Checklist

Load life 1000h at rated power with ΔR typically within ±1%; short-time overload ΔR within about ±0.5%~±1%; thermal shock cycling −55↔+155°C stable; damp heat 85°C/85%RH with minimal drift; reflow and wave soldering compatible; manual soldering ≤350°C, ≤3s contact. Incoming inspection should verify the original factory label and reel marking (part number, value, tolerance, lot code), plus sample resistance measurement and RoHS documentation.

5. Where a 27kΩ / 0.5W Resistor Fits

At 27kΩ the part serves voltage division, limiting, bleeder and feedback roles rather than current sensing:

• Power supply feedback and voltage dividers for AC-DC/DC-DC output setting and OVP thresholds — ±1% tolerance with ±100ppm/°C TCR keeps the division ratio stable across temperature; 0.5W headroom absorbs switching transients.
• Bleeder / dummy load resistors for discharging bulk capacitors after power-off or maintaining minimum load; these see continuous dissipation where derating headroom matters.
• Soft-start timing and MOSFET gate pull-down, handling inrush pulse energy comfortably.
• Industrial signal conditioning: PLC digital input current limiting, inverter drive-side protection, sensor supply dividers.
• PV inverters, storage PCS, LED drivers: high-side divider and protection branches.

Low-value CRH parts (0.27Ω, 3.3Ω) are used for current sensing with Kelvin routing; 27kΩ is not a sense value.

6. Selection and Substitution Notes

• Replacing CR1206F27K0P05Z with CRH1206F27K0P05Z is an upward-compatible move (0.25W → 0.5W); the reverse requires recalculating steady-state and pulse power.
• Choose ±1% (F) for feedback, reference dividers and protection thresholds; ±5% (J, CRH1206J27K0P05Z) is acceptable and cheaper for bleeders or dummy loads.
• Cross-brand comparison should focus on the temperature basis of the power rating (70°C vs 85°C), TCR, overload/pulse capability, lead time and lot traceability — not unit price alone.
• Avoid series/parallel combinations to reach a target value; uneven distribution can overload a single element. Move up to 1210, 1812 or 2512 if more power is needed.

7. Sourcing

• Shenzhen Shunhai Technology Co., Ltd. : authorized distributor of EVER OHMS in mainland China, covering the full range of thick film and thin film chip resistors, alloy resistors and precision resistors. Supplies genuine CRH1206F27K0P05Z from prototype to mass production, with selection support, cross-reference matching and lead-time confirmation.
• Huanian Mall : online component procurement platform for real-time stock checks and tiered pricing on EVER OHMS resistors, suited to small-batch replenishment and one-stop BOM kitting.

Before ordering, confirm tolerance (±1% or ±5%), packaging (full reel of 5000pcs or loose), and whether the original datasheet and environmental reports are required.