RC0402FR-0720KL

RC0402FR-0720KL is a 20 kΩ ±1% thick-film chip resistor from Yageo in a 0402 (1005 metric) case, documented by Yageo's per-part specification sheet: rated power 0.063 W at 70 °C, temperature coefficient ±100 ppm/°C across −55 °C to +155 °C, maximum continuous working voltage 50 V, overload 100 V and dielectric withstanding voltage 100 V, supplied on 178 mm tape at 10,000 pieces per reel. Working-voltage boundary for this value: the 50 V maximum is the platform ceiling for the case size, not a voltage this 20 kΩ part can work at continuously — its 0.063 W rating at 70 °C caps the continuous working voltage at about 35.5 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 E96-adjacent 20 kΩ value at ±1% — divider legs and set-point networks that pair with the 10 kΩ codes in this series for clean 2:1 and 3:1 ratios. Selection advice: two independent ±1% legs give a worst-case ratio error of about +2.02%/-1.98% before temperature, and the series does not guarantee leg-to-leg matching — buying both legs from the same series keeps the platform and coefficient class common, but the ratio budget must still be computed from the independent tolerances.