The ECS-51-18-5PXEN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 5.0688 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 80. Tags: Surface Mount. More details for ECS-51-18-5PXEN-TR can be seen below.