The DSC1033CI1-004.0000T is a 4 MHz MEMS-based XO (Standard) oscillator from Microchip's PureSilicon™ series, delivering a CMOS output at 3.3V with ±50ppm frequency stability.
Microchip lists the DSC1033CI1-004.0000T as Obsolete.
At 4 MHz, the CMOS output directly clocks most MCUs, FPGAs, or logic without needing an external level translator — the 3.3V rail matches common digital cores. The ±50ppm frequency stability over temperature and aging is tight enough for UART baud-rate generation and basic timing, but not for precision RF or Ethernet reference clocks. Typical supply current is 3 mA, and the standby disable drops it to 1 µA — a meaningful power saving for a sensor node that sleeps most of the time.