33.3333 MHz MEMS clock — what it replaces and why
The DSC1033AI2-033.3333C is a MEMS-based XO (Standard) that outputs a 33.3333 MHz CMOS clock from a 3.3V supply. Frequency stability is ±25 ppm, tight enough for UART, SPI, and most MCU clocking without external capacitors or trimming. The 3 mA typical supply current (max) is roughly half what a comparable quartz oscillator draws at this frequency.
Standby power-down extends battery life
When the system sleeps, the oscillator stops and the output goes high-impedance, so the clock line doesn't back-drive the load. This is the same pin function as a standard quartz oscillator's enable/disable, making it a drop-in replacement for existing XO footprints. For a battery-powered sensor logging once per minute, the 1 µA standby current adds negligible drain during sleep — the oscillator's own draw is below the self-discharge rate of a CR2032 coin cell.
The base product number DSC1033 covers a range of frequencies and stability grades in the same 4-SMD no-lead exposed pad package. If the BOM requires a different frequency or tighter stability, the same footprint accepts the sibling variant.
Package and board layout notes
The 4-SMD no-lead exposed pad package measures 7.00 mm x 5.00 mm with a seated height of 0.90 mm max. No moisture sensitivity bake is required before assembly if the sealed reel is opened within the floor-life window.