The ECS-2520MVLC-271.2-BN-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 27.12 MHz, Supply Voltage 1.8, 2.5, 3.3 V, Frequency Stability ±50 ppm, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount. More details for ECS-2520MVLC-271.2-BN-TR can be seen below.