The ECS-3953M-120-B-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 12 MHz, Supply Voltage 3.3 V, Current 15 mA, Frequency Stability ±50 ppm, Operating Temperature -10 to 70 Degree C. Tags: Surface Mount. More details for ECS-3953M-120-B-TR can be seen below.