The 501-27554-32 from Wenzel Associates is a OCXO with Frequency 10 MHz, Supply Voltage 12 V, Phase Noise -150 dBm/Hz@100 Hz to -130 dBm/Hz@10 Hz, Phase Noise 1 kHz -160 dBm/Hz, Phase Noise 10 kHz -165 dBm/Hz. Tags: PCB Mount, OCXO. More details for 501-27554-32 can be seen below.