Fox Electronics recently announced an expansion of its HCMOS oscillator line with the new FOX251 Ultra Miniature series TCXO. Available in a compact 2.5 mm x 2.0 mm package, the ultra miniature series can be cost-effectively used as general tight tolerance clocks in digital systems that can take advantage of the small size and HCMOS output. These SMD HCMOS TCXOs feature a frequency range of 4 MHz to 54 MHz with stabilities as tight as ±2.5 ppm over the -30°C to +85°C operating temperature range, ±0.2 ppm over the supply voltage change and ±0.2 ppm over the load change. Storage temperature is -40°C to +125°C. Frequency tolerance is ±1.5 ppm at 25°C. The FOX251 series features four models: the 3.3V FOX251C, 2.8V FOX251D, 2.5V FOX251G and 1.8V FOX251L models to accommodate a wide variety of design specifications.