| General > General Technical Chat |
| why to run transistors hot? |
| << < (2/2) |
| 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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