The ECS-80-12-30Q-DS-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 8 MHz, Frequency Stability ±100 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 12 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-80-12-30Q-DS-TR can be seen below.