The ECS-80-18-5PXDN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 8 MHz, Frequency Stability ±100 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 60. Tags: Surface Mount. More details for ECS-80-18-5PXDN-TR can be seen below.