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TPS54531: Thermal impact on parts lifespan when running close to the spec temperature limit

Part Number: TPS54531

We are trying to determine impacts to part life when the junction temperatures on the TPS54531running at 135degC full-time. The spec states the product is operational from -40 to 150, but we are more concerned with understanding the lifespan when the part is running on the higher end of the band and how that aligns with our planned warranty. Is there any derating data available that will show life span impacts at various temperature ranges?