The DSC1001CE2-034.0000T is a 34 MHz MEMS-based XO from Microchip's DSC1001 series, delivering a CMOS output with ±25 ppm frequency stability. The 4-SMD no-lead package (3.20 mm x 2.50 mm) fits standard oscillator footprints, so a board designed for a quartz XO can often take this part without a layout change.
No pin-compatible second source is documented, but the DSC1001 family shares the same footprint across frequencies — a 33 MHz or 35 MHz variant could serve as a functional alternative if the system clock tolerance allows.