The EX-200 from Vectron International is a OCXO with Frequency 10 to 40 MHz, Supply Voltage 3.3 to 5 V, Phase Noise -100 dBc/Hz, Phase Noise 10 kHz -150 dBc/Hz, Frequency Stability ±20 to ±50 ppb. Tags: Surface Mount, Low G-Sensitivity. More details for EX-200 can be seen below.