Board-fit checklist for 41.5 MHz MEMS oscillator
The DSC1121AM2-041.5000 is a standard XO from Microchip's DSC1121 series, built on a MEMS resonator rather than a quartz crystal — no external load caps needed, and the start-up time is under 5 ms typical.
Temperature grade and supply-voltage envelope
Frequency stability and current draw
Frequency stability is ±25 ppm across the full temperature range — tight enough for a 41.5 MHz clock feeding a 100BASE-TX PHY or a Cortex-M core without needing a TCXO.
6-VDFN exposed pad, 7.00 x 5.00 mm, 0.90 mm seated height — the exposed paddle must be soldered to a ground plane for thermal relief; the datasheet recommends a 4.5 x 4.5 mm pad on the PCB with thermal vias.