The ECS-80-18-7SX-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 8 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-80-18-7SX-TR can be seen below.