The DSC1123AE1-150.0000T is a 125 MHz LVDS-output MEMS oscillator from Microchip's DSC1123 series, qualified to AEC-Q100.
Supply voltage and temperature grade — fit check
The 2.25 V to 3.63 V supply range covers both 2.5 V and 3.3 V rails without an external regulator. For a 125 MHz SerDes reference clock, that translates to a worst-case timing error of about 400 ps — well within the jitter budget of most Gigabit Ethernet or PCIe Gen1/2 links.
Package and footprint — 6-SMD no-lead exposed pad
The pad is electrically connected to the die attach — tie it to ground or leave it floating per the datasheet recommendation; do not connect it to a supply rail. The exposed pad also provides mechanical stability under vibration. For automotive builds, ensure the solder paste coverage under the pad is at least 50 % to meet AEC-Q100 solder-joint reliability targets.