General > General Technical Chat
why to run transistors hot?
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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