Murata claims to have developed world’s smallest 32.768 kHz MEMS resonator.

Murata claims to have developed the world’s smallest 32.768 kHz MEMS resonator (the WMRAG series). Based on miniature MEMS technology, the new resonators exhibit stable frequency characteristics with a temperature drift of <160 ppm across their operating range of -30 to 85 °C. Initial frequency accuracy is ±20 ppm which is at the level expected ...

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from Electronics Weekly https://www.electronicsweekly.com/uncategorised/murata-claims-developed-worlds-smallest-32-768-khz-mems-resonator-2018-10/