The ECS-300-8-47Q-CES-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 30 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 150. Tags: Surface Mount. More details for ECS-300-8-47Q-CES-TR can be seen below.