The 138 from CTS Electronic Components is a OCXO with Frequency 10 to 26 GHz, Supply Voltage 3.13 to 5.25 V, Output_Voltage 0.1 to 0.9 V, Output Load 5 to 15 pF, Phase Noise -154 to -120 dBc/Hz. Tags: Surface Mount, Thru-Hole. More details for 138 can be seen below.