The ECS-2520S18-400-FN-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 40 MHz, Supply Voltage 1.8 V, Current 7 mA, Frequency Stability ±10 ppm, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount. More details for ECS-2520S18-400-FN-TR can be seen below.