The ASR315S2 is an SMD one-port 315.0 MHz SAW resonator designed for RF signal filtering and frequency selection applications. It features a center frequency of 315.000 MHz with a tolerance of ±75 kHz, typical insertion loss of 1.7 dB (maximum 2.4 dB), and an unloaded quality factor of 12,200, providing excellent frequency selectivity and low signal attenuation. The device operates over a temperature range of -45°C to +85°C with a frequency temperature coefficient of 0.032 ppm/°C² and frequency aging of ±10 ppm/year, ensuring stable performance across varying environmental conditions. The compact 5.0 × 3.5 × 1.5 mm package with RoHS compliance and Pb-free construction makes it suitable for modern wireless communication systems, remote control receivers, and ISM band applications where reliable frequency discrimination is required.