Automotive MEMS oscillators claim 30x ruggedness vs. xtals

January 11, 2017 // By Graham Prophet
MEMS oscillator specialist SiTime has introduced two families of ultra-robust AEC-Q100-qualified MEMS oscillators; SiT2024/25 and SiT8924/25 are designed for ASIL (Automotive Safety Integrity Level) compliant automotive applications such as advanced driver assistance systems (ADAS), in-vehicle Ethernet, powertrain and electronic control units (ECUs).

The devices are presented as 30 times more robust than quartz oscillators (tolerance of g-loads), offering stability over -55 to +125°C for in-vehicle communications, and with EMI reduction features for environmental compliance. They claim widest frequency range, tightest stability at ±20 ppm and the best reliability. The SiT2024/25 oscillators are optimized for engine-compartment systems such as engine control, transmission control, active suspension control, electronic steering and other ECUs. These oscillators are available in a SOT23-5 leaded package to enable visual inspection and to enable solder joint reliability, especially in hot and cold environments. The SiT8924/25 oscillators, available in industry-standard QFN footprints as small as 2.0 x 1.6 mm, are suitable for camera modules and other small form factor systems.


Features include;

AEC-Q100 qualified, Grade 1 (-40°C to +125°C), Grade 2 (-40°C to +105°C) and extended temperature range (-55°C to +125°C)

SiT2024/2025: SOT23-5 leaded package for best board-level solder-joint reliability and ease-of-use in manufacturing and test

SiT8924/8925: Five package options in industry-standard oscillator footprints

Frequency stability at ±20 ppm for best timing margin

Reliability of over 1 billion hours MTBF (< 1 FIT)

Shock resistance of 50,000g

Vibration resistance at 70g

Vibration sensitivity (g-sensitivity) of 0.1 ppb/g

Frequency range of 1 to 137 MHz with 6 decimal places of accuracy

Programmable output drive strength for EMI reduction

Supply voltage options of 1.8V, 2.5 to 3.3V