125 MHz MEMS clock for 1.8V digital domains
The DSC1018BI1-125.0000T is a Microchip MEMS-based oscillator delivering a 125 MHz CMOS clock from a 1.8V supply rail — a common reference frequency for Gigabit Ethernet PHYs, FPGA transceiver banks, and high-speed serial links that run on the same core voltage.
Microchip lists the DSC1018BI1-125.0000T as Obsolete. No last-time-buy date or official successor is recorded in the manufacturer's public lifecycle data — the part has been discontinued without a direct pin-compatible replacement from Microchip. For new designs, evaluate the current DSC1000 or DSC2000 series from Microchip; these share the same 4-SMD no-lead footprint and 1.8V supply option but require a pinout and functional review against the original BOM.
Housed in a standard 5.00 mm × 3.20 mm 4-SMD no-lead package with a seated height of 0.90 mm — the same land pattern used by many 5×3.2 mm oscillators, so a board spin to a different supplier's equivalent may be possible without layout changes.