1.5kΩ 0.5W High Power Thick Film Chip Resistor with ±1% Tolerance for Space

CRH1206F1K50P05Z: A Closer Look at the 1206 1.5K 0.5W Ever Ohms Resistor

Among SMD resistors, the 1206 case size is the usual compromise: larger than 0805, so it is easier to place, solder and inspect, yet far cheaper than 2010 or 2512. The drawback is that a conventional 1206 thick film part is rated at only 0.25W. When a divider or current-limiting position runs hot continuously, the temperature rise becomes noticeable and long-term drift and failure risk rise with it.

EVER OHMS addresses this with its CRH high-power thick film series. CRH1206F1K50P05Z is the 1.5kΩ member of that family — the part designers search for as the 1206 1.5K 0.5W Ever Ohms resistor. It doubles the power handling in the same footprint, which matters a lot in space-constrained power modules and driver boards.

表格

• Resistance / tolerance: 1.5kΩ, ±1% (±15Ω);
• Rated power: 0.5W @ 70℃, derating linearly above 70℃;
• Rated current / voltage: approximately 18.3mA / 27.4V;
• Maximum working voltage: commonly specified at 200V, with short-time overload around twice that;
• Temperature coefficient: typically ±100ppm/℃ in this resistance range;
• Operating temperature: −55℃ to +155℃;
• Insulation resistance: ≥10GΩ;
• Packaging: paper tape and reel, 5000pcs per reel.

Confirm these figures against the current EVER OHMS datasheet, as voltage limits and TCR breakpoints can vary between revisions.

The CRH series uses a 96% alumina substrate with a ruthenium oxide film printed and fired at high temperature, protected by a glass glaze. Alumina conducts heat considerably better than ordinary ceramic substrates, so heat reaches the pads and PCB copper faster, producing lower measured temperature rise inside enclosed housings than same-size standard parts.

Terminations are a three-layer build — nickel barrier plus lead-free SnAgCu outer plating — which resists sulphur-bearing atmospheres and humidity, suiting outdoor telecom equipment and industrial supplies. Both lead-free reflow and wave soldering are supported; for hand rework, keep the iron at or below 350℃ for no more than 3 seconds to avoid damaging the resistive element.

• Run at 50%–60% derating. The 0.5W rating assumes 70℃ ambient; holding dissipation to 0.25–0.3W keeps surface temperature controlled and extends life.
• Provide adequate thermal pads. Extending the end pads and tying them to broad copper or a ground plane works far better than relying on convection alone.
• Avoid dense clustering. Thermally coupling several dissipating resistors raises the actual temperature rise, so leave spacing in the layout.
• Check pulse conditions. Start-up surges or periodic shocks must be evaluated against the pulse withstand curve rather than average power.

• Switched-mode supplies: soft-start inrush limiting, MOSFET gate bleeders, output dummy loads;
• Divider and bias networks: 1.5kΩ is a common feedback value, and low TCR limits output drift with temperature;
• LED drivers: constant-current sampling and current-sharing branches;
• Industrial control: PLC I/O circuits, sensor signal conditioning, motor drive limiting;
• Fast chargers and adapters: over-current detection and voltage sampling loops.

Where ±0.5% or ±0.1% tolerance or lower drift is required, a precision thin film series is the better choice; where surge and pulse withstand is the priority, evaluate dedicated anti-surge types instead of simply raising the power rating.

Buy genuine 1206 1.5K 0.5W Ever Ohms resistors through authorized channels. Reclaimed or loose-stock material carries risks in batch consistency, TCR and long-term stability, which tend to surface as batch failures during mass production.

• Shenzhen Shunhai Technology Co., Ltd. : authorized distributor of EVER OHMS in mainland China, covering the full product line, with original datasheets, selection support and volume supply. Small-quantity prototyping is also supported, which suits the path from development samples to production.
• Huanian Mall : the online procurement platform operated by Shunhai, offering real-time stock lookup by part number and online ordering, convenient for multi-part-number, low-volume replenishment.

When requesting a quote, state the part number, resistance, tolerance, power rating and packaging together, and ask for the datasheet and batch information to reduce rework during later substitution and validation.