Thermostatic applied on electronic chip

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SUMMARY

The discussion centers on the unexpected temperature behavior of an Ethernet PHY component on a printed circuit board (PCB) when subjected to elevated ambient temperatures. The user measured a case temperature of 40°C at room temperature (25°C) and anticipated a linear increase to 100°C at 85°C ambient temperature, but observed only 90°C. This discrepancy suggests non-linear thermal dynamics, potentially influenced by factors such as heat dissipation, thermal resistance, and PCB design. The user references a calculator for PCB trace temperature and resistance but seeks further clarification on the thermal behavior of the component.

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  • Understanding of thermal dynamics in electronic components
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  • Knowledge of infrared thermometry for temperature measurement
  • Experience with thermal resistance calculations in electronics
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schnuber
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Hi everybody
I am an electronic engineer and I have a question concerning thermostatic behaviour of an electronic component.

I have a printed circuit board (PCB) with electronic chips on it. At room temperature 25°C I measure with the infrared themometer the case temperature of one component which is 40°C (It is an ethernet PHY).
Now I made the following assumption: If I put the PCB in a climatic chamber and adjust the chamber temperature to 85°C degree then the case temperature of the component should be 100°C = (40+(85-25)). But that is not the case, it is lower, only 90°C.
So what is going on there I don't understand this.
Please help
 
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I don't believe its a linera rise to ambient temperature as I would have to study all the calculations involved in PCB I'll instead direct you to a claculator that I've used in the past.

http://home.comcast.net/~pcb.george/trace.html
 
Last edited by a moderator:
This is a calculator that computes the temperature and resistance of a copper trace on the PCB in relation to its mechanical dimensions and electrical current.
I don't see how that gives me an answer to my question.
 

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