General > General Technical Chat

why to run transistors hot?

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Gregg:
Delta T: the hotter they are, the more heat they dissipate.  :=\

Brumby:
With the information given, this is one of the better answers one could ever expect:

--- Quote from: fourfathom on November 25, 2021, 10:36:19 pm ---Not needing to use a larger transistor?  As long as you have a comfortable margin there's no reason not to run a transistor a bit hot.  True, elevated temperatures accelerate device degradation, but normal "hot" operation isn't hot enough to make a big difference.

--- End quote ---

After all, they just need to survive long enough to pass any warranty period - and any statutory "fit for purpose" requirements.

Anybody offering high reliability products will try and reduce the operating temperature as much as possible.

fourfathom:

--- Quote from: Brumby on November 26, 2021, 12:38:05 am ---Anybody offering high reliability products will try and reduce the operating temperature as much as possible.
--- End quote ---

As much as practical.  You're not going to add a cryo-cooler unless necessary.  When I think "hot", it's more like warm to the touch, but not uncomfortably so.  Once it gets painful then you need to know what you're doing, and knowing theta junction/case (and other specs) is critical.

strawberry:
modern electronics yes, after two y buy new one

but HP, Tektronix ..  metal can transistors can withstand higher heat but still why

Miyuki:

--- Quote from: strawberry on November 26, 2021, 05:03:51 pm ---modern electronics yes, after two y buy new one

but HP, Tektronix ..  metal can transistors can withstand higher heat but still why

--- End quote ---
You rarely want to go near the plastic mould temperature limit of 150-175°C, metal or ceramic parts can go higher, but not much when it is just a plain silicone

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