The ECS-3518-666-B-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 66.666 MHz, Supply Voltage 1.8 V, Current 25 mA, Frequency Stability ±50 ppm, Operating Temperature 0 to 70 Degree C. Tags: Surface Mount. More details for ECS-3518-666-B-TR can be seen below.