ABLS-12.000MHZ-L4Q-T is an SMD low-profile crystal oscillator operating at 12.000 MHz in fundamental mode, housed in a compact HC/49US (AT49) package measuring 11.5 × 4.7 × 4.2 mm. The device features an AT-cut crystal with a maximum equivalent series resistance (ESR) of 50 O at this frequency, a shunt capacitance of 7 pF maximum, and a load capacitance of 18 pF. It operates over a temperature range of 0°C to +70°C with frequency tolerance of ±50 ppm at +25°C and frequency stability of ±50 ppm over the operating temperature range, while maintaining first-year aging of ±5 ppm maximum at 25°C. The crystal is RoHS compliant, hermetically sealed with no moisture sensitivity, and suitable for reflow soldering, making it ideal for computers, modems, microprocessors, and wireless applications requiring stable frequency references.