The ECS-73-18-23B-JTN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 7.3728 MHz, Frequency Stability ±20 ppm, Frequency Tolerance ±20 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-73-18-23B-JTN-TR can be seen below.