Quad-output MEMS oscillator for mixed-speed clock trees
The 125 MHz lanes typically feed high-speed serial interfaces (PCIe, SATA, 10GbE PHY), while the 100 MHz lanes serve the system bus or reference clock — a common split in networking and compute blades. Supply voltage spans 2.25V to 3.6V, so the same part runs on a 2.5V or 3.3V rail without a separate regulator — one BOM line covers both power domains.
Housed in a 20-VFQFN exposed pad package measuring 5.00 mm x 3.20 mm with a 0.90 mm height, this oscillator requires a thermal pad on the PCB for heat dissipation — the exposed pad must be soldered to a ground plane to keep the MEMS die within its -20°C to 70°C commercial operating range.
Active lifecycle with no replacement watch
No official successor or pin-compatible alternative is listed from Microchip; the DSC400 series is the current generation. If a board comes across the repair bench with a scorch mark near this QFN, the Active status means a direct replacement is orderable without a board spin.