The ECS-250-18-30-JEM-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 25 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±20 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 30. Tags: Surface Mount. More details for ECS-250-18-30-JEM-TR can be seen below.