The QT625S from Q-Tech Corporation is a XO with Frequency 400 MHz to 1.3 GHz, Supply Voltage 3.3 to 5 V, Frequency Stability -200 to 50 ppm, Phase Noise -170 to -163 dBc/Hz, Phase Noise 100 kHz -170 to -163 dBc/Hz. Tags: Flatpack. More details for QT625S can be seen below.