The ECS-352.512-S20AF-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 35.2512 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 40. Tags: Surface Mount. More details for ECS-352.512-S20AF-TR can be seen below.