The DSC1001BI1-001.8432T is a 1.8432 MHz fixed-frequency MEMS-based XO (Standard) from Microchip's DSC1001 series. For engine-bay applications that see 105°C ambient, check the DSC1001 high-temp variant or the DSC1121 series with extended temperature grades.
This 420:1 ratio makes the part viable for battery-backed RTC keep-alive or wake-on-event subsystems where the clock domain must be gated between active periods. For a 1.8432 MHz clock, this translates to a worst-case drift of roughly ±92 Hz — tight enough for UART baud-rate generation and general-purpose MCU clocking, but verify for precision timing or crystal-referenced PLLs.
Package, footprint, and layout notes
Housed in a 4-VDFN package measuring 5.00 mm x 3.20 mm with a seated height of 0.90 mm max. The 0.90 mm profile fits under low-clearance shrouds or between stacked PCBs.