RC0402FR-0722RL

RC0402FR-0722RL is a 22 Ω ±1% thick-film chip resistor from Yageo in a 0402 (1005 metric) case, documented by Yageo's per-part specification sheet: temperature coefficient ±100 ppm/°C across −55 °C to +155 °C, maximum continuous working voltage 50 V and overload voltage 100 V, on the RC0402 platform rated 0.063 W at 70 °C, supplied on tape and reel. Working-voltage boundary for this value: the 50 V maximum is the platform ceiling for the case size, not a voltage this 22 Ω part can work at continuously — its 0.063 W rating at 70 °C caps the continuous working voltage at about 1.2 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 low-value workhorse: USB and clock series termination, LED ballast trimming and current-sense-adjacent positions where tens of ohms are the design value. Selection advice: the 22R and 33R codes in this series (both listed here) are the classic kitting mix-up — same case, same reel format, adjacent values; and at these values, solder-joint and trace resistance are a visible fraction of the total, so the ±1% part tolerance is not the whole accuracy story.