The DSC6121JI2A-00G0T: No official successor order code is recorded, so the only path for existing BOM lines is through independent distribution where last-time-buy or surplus inventory is sourced per RFQ.
Dual-frequency MEMS XO, 2.5 × 2.0 mm
The MEMS resonator means the failure mode is mechanical fatigue rather than quartz aging — relevant when sourcing from surplus lots where date codes may be mixed.
Supply and temperature envelope
Typical current draw is 3 mA — low enough that a shared 3.3 V rail with a small series resistor can feed it without thermal concern in most designs.