The EX-420 from Vectron International is a OCXO with Frequency 10 to 30 MHz, Supply Voltage 3.3 to 5 V, Phase Noise -100 dBc/Hz, Phase Noise 10 kHz -145 dBc/Hz, Frequency Stability ±100 ppb. Tags: Surface Mount. More details for EX-420 can be seen below.