Electronics thermal design world may not know what the junction temperature is. So junction temporary prefers to the maximum temperature on this semiconductor device rather than a physical location. If you look at a data sheet for semiconductor advice, you're going to have a maximum temperature listed a requirement listed for the junction.
For sure, for say a commercial part, this limit might be 70 or 80 degrees Celsius up to military-grade where it could be 125 degrees C or higher. And this temperature when you're designing your system, it's important to maintain your components below this temperature because it's directly related to reliability.
Junction temperature affects reliability in three ways. The first way is what I call functional reliability. If you're laying out components on a board and they need to communicate with each other if they're operating at different temperatures that could compromise their ability to communicate. So your whole board will not operate as you designed it to the second tour related to lifetime reliability.
So that peak operating temperature of that junction will affect the lifetime of the part. And also the. Temperature variation, respect to time will affect your liability. So as you apply different powers or power cycling on that part, its temperature will fluctuate and the number of cycles and that temperature fluctuation are directly related to reliability.
So the challenge in designing for liability is having a predictive model that will capture the true transient. Behavior of the device. So a Simcenter™ T3STER™, which measures the transient response to that, to make conductor with Simcenter™ Flotherm™ which automatically calibrates to that measurement result, you get a very accurate predictive model of the behavior of that design and study number of designs before we ever prototype and have a real assessment of the reliability of that product.
Credit: Siemens Digital Industries Software
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