The DSC1121DM2-016.6400T is a MEMS-based XO (Standard) oscillator from Microchip's DSC1121 series, delivering a fixed 16.64 MHz CMOS output. It replaces quartz crystal oscillators in applications where shock, vibration, or temperature extremes would cause a quartz resonator to drift or fail. The MEMS resonator is the timing element — no quartz blank, no crystal aging curve to track. Startup time is typically under 5 ms, versus tens of milliseconds for a quartz oscillator, so the clock is stable before the MCU releases reset. The Enable/Disable function lets the system gate the output without cycling power — useful for clock gating in low-power sleep modes where the oscillator stays biased but the load is disconnected.
It belongs in avionics black boxes, satellite payloads, downhole drilling tools, and engine-bay electronics where a commercial-grade oscillator would fail from thermal stress. Frequency stability is ±25 ppm across the full temperature range — tight enough for a 16 MHz MCU clock or a CAN bus node without needing a TCXO.
Supply voltage and power budget
Operates from 2.25V to 3.6V, covering 2.5V and 3.3V logic rails without an external LDO. Maximum supply current is 35 mA — the MEMS core draws less than a quartz oscillator at the same frequency, leaving headroom for the rest of the rail.
Package and board layout
Housed in a 6-VDFN package measuring 2.50 mm x 2.00 mm with a seated height of 0.90 mm. The small footprint saves board space compared to a 5x7 mm quartz oscillator, but the VDFN land pattern requires careful solder-paste stencil design to avoid bridging on the centre pad. Surface-mount only — no through-hole variant.
The DSC1121 series is a current production family, so new designs can commit to this part without worrying about a near-term obsolescence. Sourced to order through independent distribution.