The ECS-2520Q-18-270-BP-TR from ECS Inc. International is a General Crystal Oscillator with Frequency 27 MHz, Supply Voltage 1.8 V, Current 3 mA, Frequency Stability ±50 ppm, Operating Temperature -40 to 105 Degree C. Tags: Surface Mount. More details for ECS-2520Q-18-270-BP-TR can be seen below.