The DSC1033AI2-054.0000T is a MEMS-based XO (standard oscillator) from Microchip's PureSilicon series, delivering a 54 MHz CMOS output from a 3.3 V supply. It is a drop-in clock source for a 54 MHz CMOS logic input.
Microchip lists the DSC1033AI2-054.0000T as obsolete. The 4-SMD, No Lead Exposed Pad package (7.00 mm x 5.00 mm, 0.90 mm seated height) is a common MEMS oscillator footprint shared by several Microchip and SiTime parts, but a direct drop-in replacement from another vendor would require cross-referencing the pinout and control logic.