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High temperature part suggestion
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I wanted a rude username:

--- Quote from: ali_asadzadeh on December 10, 2019, 10:12:59 am ---It would be used for deep down hole drilling for oil! so these solutions would not apply!

--- End quote ---

Good luck with that. It's not a gentle environment ...

RoGeorge is right: the drilling head should be being cooled by the flow of mud. And perhaps you can use the temperature differential to generate power via a Peltier device, thus avoiding the battery problem.
Gyro:
Oil well logging equipment also has incredibly difficult sealing and pressure resistance requirements, not to mention mechanical ruggedness. I don't know if the (potential) customer has all of that taken care of, if not, then temperature may be the least of your problems.
ali_asadzadeh:
Guy thanks for the answers, But why panic so much! :) somebody out there has done it, And I'm a professional too, do not worry I can do it too! I managed to find almost 95% of the parts that I needed including passives, ADC, MCU,Flash,RTC and osilator, my main problem for now is the RAM, I have found some parts, But I do not want to limit my choices to only a single source!
The MCU has only 32KB of internal RAM so either I should find a way to compress the DATA or find an external SRAM (I prefer SPI, But I'm fine with the parallel bus too)

This is the RAM
https://www.voragotech.com/products/hs512k16
Though I wonder how it should be used, all the pins seems to short on the outer frame! should I cut it out? any other source for the RAM is highly appreciated. I do not want to limit my choices to a single manufacturer.
Gyro:

--- Quote from: ali_asadzadeh on December 11, 2019, 09:12:06 am ---Guy thanks for the answers, But why panic so much! :)

--- End quote ---

I just don't want to see you ending up with your ass in a sling.  ;)


P.S. Just a quick one. Don't forget that most Vreg ICs go into die over-temperature shutdown at around that temperature or below.
mzzj:
Good luck sourcing the parts if you live in Iran. Most of them are probably under one or another export limitation.
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