The ECS-120-7-36Q-AEY-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 12 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 7 pF, Equivalent Series Resistance 150. Tags: Surface Mount. More details for ECS-120-7-36Q-AEY-TR can be seen below.