The ECS-384-CDX-1983 from ECS Inc. International is a RF Quartz Crystal with Frequency 38.4 MHz, Frequency Stability ±40 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 10 pF, Equivalent Series Resistance 40. Tags: Surface Mount. More details for ECS-384-CDX-1983 can be seen below.