21 MHz MEMS XO for high-temp automotive domains
The DSC1221DA3-21M00000 is a 21 MHz MEMS-based oscillator from the DSC12X1 series, delivering a CMOS output with ±20 ppm frequency stability across a -40 to +125°C operating range. Its AEC-Q100 qualification puts it in the Grade 0 temperature band — the same class used for transmission control modules, engine ECUs, and exhaust-aftertreatment sensors where ambient temps regularly exceed 105°C.
Supply tolerance and enable/disable control
The oscillator accepts a 2.25 V to 3.63 V supply, covering both 2.5 V and 3.3 V logic rails without an intermediate LDO — simplifies the power tree in multi-rail designs.
MEMS resonator vs. quartz — the reliability delta
For a drivetrain-mounted ECU or a transmission valve-body controller that sees 10–20 g continuous vibration, the MEMS construction avoids the microphonic frequency shift that can cause jitter on the CAN or FlexRay bus.
Housed in a 6-VDFN measuring 2.50 mm × 2.00 mm with a seated height of 0.90 mm, the package fits the compact footprint typical of automotive camera modules, radar sensors, and telematics control units. Surface-mount assembly with a 0.50 mm pitch — the small pad geometry calls for a controlled stencil aperture and a reflow profile aligned with JEDEC J-STD-020 for the 6-VDFN body.