The DSC1124CI5-156.2500T is a MEMS-based oscillator (XO) delivering a 156.25 MHz reference clock with HCSL output, the standard differential signaling for PCIe Gen1/2/3 reference clocks and 10GbE SerDes.
Microchip lists the DSC1124CI5-156.2500T as Active. The part ships in Tape & Reel — the 6-SMD No Lead package (3.20 mm × 2.50 mm footprint, 0.90 mm seated height) is a standard MEMS-oscillator land pattern, compatible with existing XO footprints from SiTime, Epson, or IDT.
Current draw and output drive — what the 42 mA supply current means
Maximum supply current is 42 mA at full load. For a 156.25 MHz HCSL output driving a 50-Ω terminated differential pair, this draw is typical — the HCSL swing is 0.7 Vpp into 50 Ω to ground, so the output stage burns about 14 mA per leg. Budget the 42 mA into the 3.3 V rail; it leaves headroom for a second fan-out buffer if needed.