Programmable blank — frequency set at the line
Shipped as a blank (unprogrammed) device, the DSC8121AE5 requires a one-time frequency configuration via Microchip's programming tools before it can generate a clock output — this suits high-mix production where a single BOM line covers multiple frequency variants.
The DSC8121 series is a standard catalog product; no official pin-compatible second source or successor is recorded, but the wide supply range and CMOS output make it a direct fit for any 6-pin MEMS oscillator footprint on the board.
