The 501-22578e-02 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 10 MHz, Supply Voltage 12 V, Phase Noise -150 dBm/Hz@100 Hz to -125 dBm/Hz@10 Hz, Phase Noise 1 kHz -160 dBm/Hz, Phase Noise 10 kHz -165 dBm/Hz. Tags: PCB Mount, Low G-Sensitivity. More details for 501-22578e-02 can be seen below.