MEMS XO with wide temperature grade
The DSC8121BM5: It ships blank — you program the exact frequency via Microchip's programming tools, which makes it a single SKU that covers multiple BOM positions if you have the programming infrastructure.
Parametric highlights for the design review
The MEMS die inside is inherently shock- and vibration-tolerant compared to quartz, which matters in high-g deployments.
Obsolete — sourcing through surplus channels
No official successor is listed; the DSC8121 series itself is end-of-life.