ABLS-25.000MHZ-B4-F-T is a 25 MHz SMD crystal oscillator designed for precision frequency control in electronic applications. This device operates in fundamental AT-cut mode and is housed in a compact HC/49US (AT49) low-profile package measuring 11.5 × 4.7 × 4.2 mm. The crystal features a frequency tolerance of ±50 ppm at +25°C, frequency stability of ±50 ppm over the operating temperature range of 0°C to +70°C, and an equivalent series resistance (ESR) of 40 O maximum. Additional specifications include a shunt capacitance of 7 pF maximum, load capacitance of 18 pF, drive level of 1 mW maximum (100 µW typical), and aging of ±5 ppm maximum during the first year at 25°C. The device is RoHS compliant, hermetically sealed with no moisture sensitivity, and suitable for reflow soldering. It is commonly used in computers, modems, microprocessors, and wireless applications where stable frequency reference is essential.