The ECS-76.8-18-5PXEN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 7.68 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 60. Tags: Surface Mount. More details for ECS-76.8-18-5PXEN-TR can be seen below.