SOI (Silicon On Insulator)
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"A 225°C Rated ASIC for Quartz Based Downhole Transducers". . In the paper, they say "Custom ICs designed using High Temperature rated SOI processes have been shown to function above 300°C" and they reference
Tekmos High Temperature ASICs, 250ºC and 200ºC, .
"basic [SOI] building blocks measured up to 300°C are shown". (2015)
"Extending the operation of low-cost junction-isolated CMOS to this [250C] temperature is feasible through straightforward changes in process technology, circuit styles, and layout design rules". (1999)
"The Tekmos TK22V10H [PAL] will operate up to 300ºC".