Digital goodies are rated for service over particular ranges of temperature. I just lately got here throughout some temperature vary tabulations as proven in Determine 1.
Determine 1 Temperature ranges and commonalities.
Nomenclature alone isn’t sufficient of a information as a result of identify commonalities, however there’s one side of the temperature limits that deserves the telling of a story.
Again round 1986, I used to be speaking with a semiconductor firm’s tech rep about plastic packaged semiconductor temperature ranges. I might perceive such units not being rated to excessive temperatures of 125°C as in army rated units, however why had been they restricted at chilly to solely -40°C as an alternative of -55°C?
The man instructed me that the epoxy materials of the “plastic bundle” was the issue. His anecdote to me was that there was no epoxy that may very well be used at colder than -40°C. I’ve by no means seen this documented, however that was the story.
Thirty-plus years later, it this nonetheless so? Please see the next from Google (Determine 2).
Determine 2 A generalized touch upon the climate.
I’ve heard of some locations which have solely two yearly seasons—winter and Wednesday. Minnesota may be one in all them. In any case although, winter temperatures can dip under that -40°C quantity which raises a query.
Determine 3 An automotive rated semiconductor.
If I’ve digital elements like this (Determine 3) integrated into my vehicle and I get up within the morning to a file low temperature within the northern Midwest United States (or Canada), can I be assured that my vehicle will truly operate?
Feedback?
John Dunn is an electronics advisor, and a graduate of The Polytechnic Institute of Brooklyn (BSEE) and of New York College (MSEE).
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