The PX-504 from Vectron International is a XO with Frequency 30 to 180 MHz, Supply Voltage 3.135 to 5.25 V, Frequency Stability ±25 ppm, Current 15 to 20 mA, Duty Cycle 45 to 55 %. Tags: Surface Mount, Low G Sensitivity. More details for PX-504 can be seen below.