MEMS oscillator at a common MCU clock frequency
The DSC1030BC1-003.6864T is a MEMS-based XO (Standard) from Microchip's PureSilicon™ series, delivering a 3.6864 MHz CMOS output at 3V supply. That frequency is a classic choice for UART baud-rate generation and low-speed MCU clocking — 3.6864 MHz divides cleanly to common baud rates like 115200. Current draw is 3 mA max active, dropping to 1 µA max in Standby (Power Down) mode — the disable current is low enough that a coin-cell backup can hold the oscillator off for years between wake cycles.
Microchip lists the DSC1030BC1-003.6864T as Obsolete.
The package is a 4-SMD, No Lead type measuring 5.00 mm x 3.20 mm with a seated height of 0.90 mm.