What this MEMS oscillator does on the board
The DSC6003JI2A-012.0000T is a MEMS-based XO (standard oscillator) from Microchip's DSC60XX series, delivering a 12 MHz CMOS clock with ±25 ppm frequency stability across the full -40°C to +85°C industrial temperature range. Its 1.71V to 3.63V supply range lets it run directly off 1.8V, 2.5V, or 3.3V rails without an extra regulator — a clean clock source for a mixed-voltage MCU or SoC.
If you are migrating a design, check the DSC60XX family for other active variants at the same frequency and package; the 4-SMD no-lead 2.5×2.0 mm footprint is common across the series, but verify the Enable/Disable logic and stability grade before substituting.
Housed in a 4-SMD, No Lead package measuring 2.50 mm × 2.00 mm with a seated height of 0.90 mm. CT is fine for prototypes and small batches.