The ECS-250-8-37Q-ES-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 25 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-250-8-37Q-ES-TR can be seen below.