RC0805FR-071KL

RC0805FR-071KL is a 1 kΩ ±1% thick-film chip resistor from Yageo in an 0805 (2012 metric) case, documented by Yageo's per-part specification sheet: rated power 0.125 W at 70 °C, temperature coefficient ±100 ppm/°C across −55 °C to +155 °C, maximum continuous working voltage 150 V, overload 300 V and dielectric withstanding voltage 300 V, supplied on 178 mm tape at 5,000 pieces per reel. Working-voltage boundary for this value: the 150 V maximum is the platform ceiling for the case size, not a voltage this 1 kΩ part can work at continuously — its 0.125 W rating at 70 °C caps the continuous working voltage at about 11.2 V (the square root of allowable power x resistance), and that cap falls as temperature derates the allowable power; the governing limit is always the lower of the two. The selection point is the platform step: twice the rated power of the 0402 1 kΩ in the same series (0.125 W against 0.063 W) and a 150 V platform ceiling against 50 V — while the continuous voltage either part can actually sustain at 1 kΩ is set by power, not by the ceiling: about 11.2 V here against about 7.9 V for the 0402 at their 70 °C ratings, for positions that run warm. Selection advice: 0805 is also the smallest case many assemblers will hand-solder for rework — where serviceability matters, the case choice in the code is a maintenance decision as much as an electrical one.