The CRCW0805121RFKEA is a surface mount device (SMD) thick film resistor made by Vishay. It is 1/8 watt, 121 ohms, 1% tolerance, and 100ppm temperature coefficient of resistance. The abbreviation stands for its size and value, with "CRCW" indicating that it is a Chip Resistor (Surface Mount), 0805 designating that it is 0.080 inches (2.032mm) long and 0.050 inches (1.27mm) wide, and "121" indicating its value of 121 ohms. The remaining "RFKEA" portion of the part number can be used to identify the manufacturer and product line. This resistor has excellent performance in high frequency applications with low noise. It is suitable for commercial and industrial applications.