4 MHz MEMS oscillator – what it clocks and where it ran
The DSC6003JI2A-004.0000 is a 4 MHz MEMS-based oscillator with CMOS output, ±25 ppm frequency stability, and an operating range of -40°C to +85°C — suitable for industrial and automotive clock trees that need a fixed-frequency reference in a 2.50 mm × 2.00 mm 4-SMD no-lead footprint. Supply voltage spans 1.71 V to 3.63 V, so it can run from a 1.8 V or 3.3 V rail without an external regulator; the enable/disable function lets the system gate the clock for power savings, drawing only 1.3 mA typical in active mode.
Obsolete – sourcing through surplus channels
Microchip has marked this part obsolete. A pin-compatible alternative in the DSC60XX family with the same 4 MHz, CMOS output, and AEC-Q100 rating should be verified against the original layout before substituting.
Automotive-grade qualification – what AEC-Q100 means
If a replacement does not carry AEC-Q100, the board-level reliability profile changes — the MEMS die's shock tolerance (typically 50,000 g) and hermetic seal are part of the qualification package.