That lets the ECU keep the oscillator powered but quiescent during sleep, waking on a GPIO edge without a full power cycle.
Housed in a 4-SMD, No Lead package measuring 2.50 mm x 2.00 mm with a seated height of 0.90 mm. The 0.098" x 0.079" footprint matches industry-standard 2.5 x 2.0 mm MEMS oscillator land patterns — no special via-in-pad or thermal relief required. The TR format suits automated pick-and-place for production volumes; CT works for prototype builds and small-batch rework.
