The DSC1001DL5-027.0000T: This is a Microchip DSC1001-series MEMS-based XO (standard oscillator) that spits out a clean 27 MHz CMOS clock. The big deal for field work is the temperature span: -45°C to 105°C — that covers under-hood automotive, outdoor telecom cabinets, and engine-bay electronics where a standard quartz can might drift or stop. It's AEC-Q100 qualified, so the reliability paperwork is there for automotive BOMs.
Supply voltage range is 1.8V to 3.3V, so it plays with both 1.8V and 3.3V logic rails without a level translator.
Status is Active. The 4-SMD, No Lead package is a standard footprint — 2.50 mm x 2.00 mm — so it's a straightforward pick-and-place swap on the line.