The VC-TXO-35SM-128-B-TR from ECS Inc. International is a VCTCXO with Frequency 12.8 MHz, Supply Voltage 3 V, Frequency Stability ±2.5 PPM, Current 1.5 mA, Operating Temperature -30 to 75 Degree C. Tags: Surface Mount. More details for VC-TXO-35SM-128-B-TR can be seen below.