The ECS-163.84-18-5PLX-AGN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 16.384 MHz, Frequency Stability ±30 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 40. Tags: Surface Mount. More details for ECS-163.84-18-5PLX-AGN-TR can be seen below.