The 49SBT27138151540 is an SMD crystal resonator manufactured by JGHC. It has a frequency of 27.1383MHz ±15ppm and a size of 11.5x4.8mm. It is RoHS compliant and has been designed for use in electrical applications that require precision timing. It can be used in a variety of circuits, including clock-related devices, such as oscillators and alarms, as well as for signal filtering and signal precision in communications equipment.