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How to calculate data sheet it not included in thermal resistance?

Latest Updated:07/01/2008

Question:

The data sheet does not include a description of the thermal resistance.
How can I calculate it?

Answer:

The thermal resistance can be calculated based on the total dissipation (PT) described in the data sheet.

  • Junction-to-ambient Rth (j-a) = (Tj-Ta)/PT
  • Junction-to-case Rth (j-c) = (Tj-Tc)/PT

Taking the 2SD1588 as an example, the thermal resistance is as follows.

  • Rth (j-a) = (150°C - 25°C )/2W = 62.5°C/W
  • Rth (j-c) = (150°C - 25°C)/30W = 4.17°C/W
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