27 MHz ±25 ppm — the timing anchor for the bus clock
The DSC1001AL2-027.0000T: That ±25 ppm window — 675 Hz at 27 MHz — keeps the MCU clock or CAN/SPI bus within tight timing margin across temperature and supply variation, without the aging drift a quartz crystal would introduce. For an ECU that must clock the CAN controller within 2 ms of power-on, that matters.
The 105°C ceiling covers the ambient near the exhaust manifold or turbocharger — a quartz oscillator at that temperature would drift outside ±25 ppm without temperature compensation; the MEMS die holds the frequency within the same window. The part is current for new designs and volume builds.
Operates from any supply between 1.8V and 3.3V — no separate regulator needed if the core rail is 1.8V or the I/O rail is 3.3V. The 7.2 mA max active current is typical for a 27 MHz CMOS output at 3.3V; at 1.8V the draw drops proportionally.
4-SMD no-lead — standard 7.0 x 5.0 mm footprint
The footprint matches the industry-standard 7x5 oscillator land pattern — a drop-in replacement for quartz XOs in the same size, no board spin needed. Supplied on Tape & Reel (TR) — 1000 or 3000 pieces per reel depending on the reel diameter, ready for automated pick-and-place without a tray change.