MEMS XO with dual-frequency output — 20 MHz and 24 MHz on one die
The DSC6121CI1A-0043: This dual-frequency capability lets a single BOM line cover two clock domains, reducing inventory line items for designs that need both rates at different operating modes.
Obsolete — sourcing through independent channels
No pin-compatible direct replacement is published by Microchip, so a redesign or a parametric search against the DSC61XX family (same package, same supply, same output format) is the migration path for new builds.