The 520 from CTS Electronic Components is a TCVCXO with Frequency 10-40 MHz, Supply Voltage 1.8V, 2.5V, 2.7V, 2.8V, 3.0V, 3.3V, Temperature Stability Options Available from ± 0.5 ppm to ± 2.5 ppm, Operating Temperature -10 to +60°C -20 to +70°C -30 to +85°C -40 to +85°C. Tags: Surface Mount. More details for 520 can be seen below.