The ECS-400-8-33Q-ADS-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 40 MHz, Frequency Stability ±100 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 40. Tags: Surface Mount. More details for ECS-400-8-33Q-ADS-TR can be seen below.