The DSC1121AM2-033.3330: This is a MEMS-based XO (Standard) from the DSC1121 series, outputting a 33.333 MHz CMOS clock. The ±25 ppm frequency stability (cite:) keeps jitter tight enough for 10/100 Ethernet PHY reference clocks and USB microcontroller timing. Supply voltage spans 2.25V to 3.6V (cite:), so it runs on a 2.5V or 3.3V rail without an extra regulator. No lab bench needed to verify this; a simple GPIO pull-down on the enable pin does it.
Military temp range and automotive qualification
The AEC-Q100 rating (cite:) adds the automotive reliability stress tests (preconditioning, temperature cycling, ESD), so it is a valid choice for under-hood ECUs or ADAS sensor modules where a standard commercial oscillator would not survive the thermal cycling.
Product status is Active (cite:) — Microchip is still producing this part, and it remains open for new designs. No last-time-buy window to track, no successor to evaluate.