The DSC1001AI1-120.0000T is an active-production MEMS-based XO from Microchip Technology, delivering a 120 MHz CMOS clock output across a 1.8V to 3.3V supply range.
Frequency stability and power budget
Housed in a 4-SMD, No Lead Exposed Pad package measuring 7.00 mm x 5.00 mm with a seated height of 0.90 mm.
No direct pin-compatible second-source is cited; the DSC1001 series shares the same 7x5 mm footprint across frequency variants, so a BOM change to a different frequency within the series requires only a code change, not a layout spin.