The ECS-80-8-33Q-ADS from ECS Inc. International is a RF Quartz Crystal with Frequency 8 MHz, Frequency Stability ±100 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 500. Tags: Surface Mount. More details for ECS-80-8-33Q-ADS can be seen below.