The 7E40000E09UCG is an SMD crystal resonator with 2520/4PINSEAM RoHS manufactured by SJK. It is a miniature surface-mounted component that creates a precise frequency signal for use in oscillator circuits. It consists of a quartz crystal with a pair of electrodes, encapsulated in a plastic casing. The resonator operates by using the piezoelectric effect created by the quartz crystal within the component. The 4-PIN design allows for easy assembly and connection to a printed circuit board (PCB). The RoHS compliant resonator is designed for use in applications that require an accurate frequency signal such as smartphones, tablets, and communications equipment.