The ECS-3953M-400-AU-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 40 MHz, Supply Voltage 3.3 V, Current 25 mA, Frequency Stability ±100 ppm, Operating Temperature -55 to 125 Degree C. Tags: Surface Mount. More details for ECS-3953M-400-AU-TR can be seen below.