40 MHz MEMS XO with full military temp range
The DSC1101CM1-040.0000: This is a 40 MHz MEMS-based oscillator from Microchip's DSC1101 series, delivering a CMOS clock output across a 2.25V to 3.6V supply range. The 6-SMD no-lead package (3.20mm x 2.50mm, 0.90mm seated height) is a standard footprint that reflows easily with a hand-soldering iron if you're careful with the pad alignment.
Max supply current is just 95 µA, so the oscillator's own draw is negligible next to the MCU's active current.
