The ECS-3963-040-BN-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 4 MHz, Supply Voltage 3.3 V, Current 8 mA, Frequency Stability ±50 ppm, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount. More details for ECS-3963-040-BN-TR can be seen below.