The R5050315MA8SI is a SAW (surface acoustic wave) resonator in a SMD5050 package. It is manufactured by Yangxing and is RoHS compliant. It operates at a frequency of 315 MHz with a frequency stability of +/- 8 ppm. It is suitable for use in radiofrequency applications, such as handsets, smartphone base stations, and other communication systems. It has low power consumption, low phase noise, and a high shock resistance, making it suitable for use in harsh environments as well.