CRH1206F27R0P05Z 1206 High Power Thick Film Chip Resistor 27Ω 0.5W ±1% Tolerance

CRH1206F27R0P05Z Parameter Guide: 1206 27R 0.5W Ever Ohms High Power Chip Resistor

CRH1206F27R0P05Z is the full orderable part number of EVER OHMS (天二科技) CRH series high power thick film chip resistor, commonly referred to in the industry as the "1206 27R 0.5W Ever Ohms resistor."

Writing only "1206 27Ω 1/2W" in a BOM risks receiving the ±5% CRH1206J27R0P05Z or the standard-power CR1206F27R0. Always specify the full part number.

Two values worth calculating separately:

• Actual continuous working voltage: RCWV = √(P×R) = √(0.5×27) ≈ 3.67V, well below the 200V insulation limit. At this resistance, power dissipation—not dielectric strength—is the governing constraint. For high-voltage bus or AC-input divider applications, choose EVER OHMS HR or other high-voltage series instead.
• Continuous current limit: I = √(P/R) = √(0.5/27) ≈ 136mA. For steady-state designs, keep a 1.5–2× margin, meaning long-term current should stay within roughly 70–90mA.

The rating is referenced to a 70℃ ambient, with linear derating to zero at 155℃:

• 85℃ ambient → ~82%, i.e., 0.41W
• 105℃ ambient → ~59%, i.e., 0.29W
• 125℃ ambient → ~35%, i.e., 0.18W

Enclosed enclosures, inner layers without thermal copper, and dense component placement all raise the local ambient temperature. Adding copper pour under the pads and thermal vias to an internal ground plane reduces temperature rise noticeably; otherwise, derate further. For pulse conditions, average power alone is insufficient—verify single-pulse energy and repetition rate against the datasheet's pulse power curve.

Within the same 1206 footprint, the CRH series doubles power handling from 0.25W to 0.5W through optimized thick film paste formulation and improved heat path in the alumina substrate. Practical benefits:

• PCB area saved. No need to upsize to 1210, 1812, or 2010; existing pad layouts and placement programs remain unchanged, with identical reflow and wave soldering compatibility.
• Lower temperature rise, more stable resistance. At the same 0.2W dissipation, CRH runs cooler, so TCR-induced drift is smaller—beneficial for divider and sensing accuracy.
• Better pulse capability. Inrush currents from motor starts, relay pull-ins, and power-up events can open standard 1206 resistors; the CRH construction withstands higher pulse energy.

The 27Ω value sits in the mid range. It is neither a milliohm shunt nor a pull-up in the kiloohm region. Typical roles include current limiting, soft-start, dummy load, MOSFET gate discharge, low-current sensing, and divider networks. The ±1% tolerance combined with ±100ppm/℃ TCR suits power-supply feedback loops, LED constant-current drivers, and industrial control signal conditioning.

• Prefer reflow soldering. For hand rework, keep the iron below 350℃ and contact time under 3 seconds to avoid thermal shock damage or termination delamination.
• Do not parallel resistors to approximate a value. Current sharing between two 27Ω parts is uneven, and one may fail first. When higher power is needed, move to a 1210/2010 package or a metal-alloy resistor.
• Inspect incoming material. Verify PART/NO, resistance, tolerance, and lot code on the original label and reel; sample-measure resistance and request RoHS reports where necessary. Authorized channels substantially reduce the risk of mixed lots, remarking, or ±5% substituted for ±1%.
• Storage. Keep unopened packs at 5–35℃, RH ≤60%; after opening, observe moisture control and bake per specification before going online if exposure time is exceeded.

CRH1206F27R0P05Z is a commodity part, but tolerance grade, packaging, and lead time must still be confirmed before ordering. Choose suppliers with manufacturer authorization and traceable lot records.

• Shenzhen Shunhai Technology Co., Ltd. : An authorized distributor of EVER OHMS in mainland China, covering the full EVER OHMS portfolio of thick film and thin film chip resistors, alloy resistors, and precision resistors. Shunhai supplies genuine CRH1206F27R0P05Z, supports small-batch prototyping through full-reel production orders, and provides selection guidance, cross-reference matching, and lead-time confirmation.
• HuaNian Mall : An online electronic components purchasing platform where you can search EVER OHMS part numbers, check real-time stock and tiered pricing, and place inquiries or orders directly. It is well suited for small-batch replenishment, quick price comparison, and one-stop BOM kitting.