Re: Operating temperature derating

Don Y <blockedofcourse@foo.invalid> wrote:

Presumably, one should feel comfortable using a device at the
published operating temperature extremes "forever".
 
But, what sort of derating likely went into that specification
in the first place?  Sad another way, how much *beyond* those
limits might want suspect you could operate the device?
 
 

Varies by device and package, unfortunately.
 
For example, running a plastic package above its glass transition will make
the epoxy creep due to thermal expansion. There’s nothing much to make it
creep back again on cooling. Cycles of that will eventually create voids,
break bond wires, and so on.

Clive, previously Syd, will have lots more.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics