The ABM3B-12.000MHZ-10-1-U-T is a ceramic surface-mount quartz crystal designed for communication, test equipment, and high-density applications. It operates at a fundamental frequency of 12.000 MHz with a frequency tolerance of ±10 ppm at +25°C and maintains frequency stability of ±10 ppm over the operating temperature range of -40°C to +85°C. The device features a low equivalent series resistance (ESR) of 70 O, a load capacitance (CL) of 6 pF, and a shunt capacitance (C0) of 18.0 pF, all housed in a compact four-pad SMD package measuring 5.0mm × 3.2mm × 1.1mm. The crystal is seam-sealed for long-term reliability, suitable for reflow soldering, and compliant with REACH/RoHS II standards. Its tight stability and low ESR make it ideal for precision timing applications in communication systems, wireless devices, and PCMCIA applications.