The DSC1033CI1-029.4912T is a MEMS-based XO (standard oscillator) from Microchip's PureSilicon™ series, delivering a 29.4912 MHz CMOS output at 3.3V supply. It's a surface-mount part in a 4-SMD no-lead package, 3.20mm x 2.50mm footprint, with a standby (power-down) function that drops supply current to 1µA max.
Microchip lists the DSC1033CI1-029.4912T as obsolete. That means it's no longer in production and not recommended for new designs. If you need a drop-in replacement for an existing BOM line, check the DSC1033 family for a similar part; otherwise, a functional equivalent from a different series may require a layout change.
29.4912 MHz is a non-standard frequency—often used in serial communication or microcontroller clocking where a precise baud rate or timing reference is needed. The 3.3V supply rail is common in modern digital systems, so it fits directly into a 3.3V domain without a level shifter. ±50ppm frequency stability over -40°C to 85°C means the output stays within 50 parts per million of the nominal frequency across the full industrial temperature range—tight enough for most UART, SPI, or I2C timing budgets. The 3mA max supply current (typ) keeps the power draw low in battery-powered designs.
4-SMD no-lead package, 3.20mm x 2.50mm, 0.90mm seated height. No exposed thermal pad—just the four edge terminations. It reflows easily with a standard hot-air profile; the small thermal mass means it heats up fast, so keep the nozzle temperature around 300°C with moderate airflow to avoid cooking the MEMS die.