The ECS-200-8-36Q-AES-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 20 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 60. Tags: Surface Mount. More details for ECS-200-8-36Q-AES-TR can be seen below.