The 278 Series from Oscilent is a RF Quartz Crystal with Frequency 13 to 54 MHz, Frequency Tolerance ±10 to ±30 ppm, Drive Power Level 10 to 300 µW, Load Capacitance 8 to 30 pF, Shunt Capacitance 3 pF. Tags: Surface Mount. More details for 278 Series can be seen below.