Just what I need for the day job...

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High temperature flash SPI chips... up to 8Gb at 175C, 1Gb at 200C: http://www.sesemi.co.uk/index.ph...

Or there's a new TI chip http://www.ti.com/product/sm28vl... which is only 32Mb but would replace a pile of 2Mb chips in the current design - the only snags are (a) it's a bit physically big and (b) the chips are $750 each!

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At only 1000 write/erase cycles, each op costs $0.75!
I gather you like your chips 'well done'!

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Definitely toasty.

We're expecting for the next incremental temperature rating to have to replace the entire electronics package after each run.