Obsolete MEMS XO — dual-frequency 24 MHz / 48 MHz output
The DSC6121HI2A-00AR: This part was designed for space-constrained boards needing two common clock frequencies without a separate PLL or second oscillator.
Parametric profile — supply, stability, and power budget
Maximum current draw is 3 mA (typ), a low-power figure that keeps thermal rise minimal in the VFLGA package and extends battery life in portable instruments. The DSC61XX family is a standard commercial oscillator series, not screened to MIL-PRF or QML.
Sourcing an obsolete MEMS XO
Microchip has discontinued the DSC6121HI2A-00AR. No official successor order code is listed in the product record. For BOM lines that require this exact dual-frequency output and package, the remaining supply is held in independent distribution channels — surplus and new-old-stock lots confirmed at time of quote. Because the part is obsolete, a design-in for new production is not viable without a board spin to an active replacement. For existing assemblies, the dual 24 MHz / 48 MHz CMOS output is specific enough that a drop-in second source is unlikely; each RFQ lot should be inspected for date code consistency and traceability.