MEMS oscillator at 25 MHz — what it replaces and where it fits
The DSC1033AC1-025.0000 is a MEMS-based XO (Standard) that generates a fixed 25 MHz CMOS clock — a direct drop-in for quartz crystal oscillators in the same 7.0 mm × 5.0 mm 4-pin SMD footprint, but with a silicon MEMS resonator instead of a quartz blank.
Package and board-mounting notes
Housed in a 4-SMD, No Lead Exposed Pad package measuring 7.00 mm × 5.00 mm with a seated height of 0.90 mm — the exposed pad underneath provides a thermal path to the PCB ground plane, though the 3 mA draw rarely needs it.