The ECS-120-8-33B-CHN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 12 MHz, Frequency Stability ±25 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-120-8-33B-CHN-TR can be seen below.