The 6-SMD, no-lead package (5.00 mm x 3.20 mm footprint, 0.90 mm seated height) is a standard MEMS oscillator land pattern — no via-in-pad or exotic fan-out required. The supply voltage range of 2.25 V to 3.6 V covers 2.5 V and 3.3 V rails without an external regulator.
This is a single-sourced Microchip part — no official second source or cross-reference is published. The DSC1121 series shares the same pinout and package across frequency variants, so a BOM position using the DSC1121AI5-010.0000T (same frequency, different stability grade) can be evaluated for direct substitution by comparing the stability spec.