The DSC1121BM1-048.0000 is an active-production MEMS-based XO (Standard) oscillator from Microchip, rated for the full -55°C to 125°C military temperature range — it keeps a 48 MHz CMOS clock on the rail through engine-bay heat soak and cold-soak at -55°C, where a quartz oscillator would drift or stop. AEC-Q100 qualification confirms it passes automotive-grade reliability stress and PPAP — the part is suited for under-hood ECUs, ADAS sensor modules, and chassis-domain controllers that require -40°C to 125°C operation with margin.
The 2.25V to 3.6V supply range covers both 2.5V and 3.3V logic rails without an external LDO — a single oscillator serves a mixed-voltage board where the MCU runs at 3.3V and the FPGA bank at 2.5V. CMOS output drives standard digital loads directly — no termination network needed for short traces under 2 inches.
Package and footprint — 5.0×3.2 mm 6-SMD
The 6-SMD, no-lead package measures 5.00 mm × 3.20 mm with a seated height of 0.90 mm — the footprint is the same as a standard 5×3.2 mm quartz oscillator, so the DSC1121BM1-048.0000 drops onto an existing board layout without a spin. Surface-mount assembly reflows on a standard lead-free profile; the MEMS resonator inside is less sensitive to board flex than a quartz crystal, reducing the risk of startup failures on thin PCBs.