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REF200: Maximum cold storage temperature

Part Number: REF200

Hello,

I would like to use the REF200AU and I notice the cold storage temperature maximum rating is -40degC.  I have a need to be able store it at -50degC on occasion.  Can you help me understand why the part is not already rated at -50degC for maximum cold temperature storage?  Or let me know if the part rating can be updated to -50degC maximum cold storage?    Lastly if there is a similar device with a greater maximum cold storage temperature can you let me know the part number?


Thanks,

HSG