The DSC1033DI2-005.1200: This is a 5.12 MHz XO (Standard) with CMOS output, built on Microchip's PureSilicon™ MEMS resonator technology. The 3.3V supply rail is fixed; if your design runs 1.8V or 2.5V I/O, this part won't level-shift without an external translator.
Power budget — active and standby current
Active draw is 3 mA typical, which is low for a 5 MHz oscillator but not the floor — the real battery-life win is the Standby (Power Down) function: when the enable pin is pulled low, supply current drops to 1 µA max. For a battery-powered sensor that sleeps 99% of the time, that standby current sits below the self-discharge rate of most coin cells.
Microchip lists this order code as Obsolete. No official successor or pin-compatible replacement is recorded in the DSC1033 family documentation — the DSC1033DI2-005.1200 is the exact part for BOM positions that require this frequency, package, and stability. The 4-SMD, No Lead package (2.50mm x 2.00mm footprint, 0.90mm seated height) is standard for MEMS oscillators — no special reflow profile beyond the usual lead-free solder curve.