8W 2.5 x 2.0mm SMD CMOS CXO Oscillators TXC 8W 2.5 x 2.0mm SMD CMOS CXO Oscillators are ultra-small SMD seam-sealed clock crystal oscillator units that offer a frequency range of 4 ~ 54MHz and frequency stability of ±50ppm (-10 ~ + 70ºC). The TXC 8W series operates with an output load of 15pF and a supply voltage range of 3.3V (1.8V, 2.5V available).