# Does PLECS interpolate the loss model between temperatures if the device's thermal model is only provided for certain temperatures?

**URL:** <https://forum.plexim.com/t/does-plecs-interpolate-the-loss-model-between-temperatures-if-the-devices-thermal-model-is-only-provided-for-certain-temperatures/3244>\
**Category:** PLECS\
**Tags:** plecs, thermal-model\
**Created:** [July 28, 2026, 5:56pm UTC](https://forum.plexim.com/t/does-plecs-interpolate-the-loss-model-between-temperatures-if-the-devices-thermal-model-is-only-provided-for-certain-temperatures/3244 "2026-07-28T17:56:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![plexie](https://avatars.discourse-cdn.com/v4/letter/p/dec6dc/32.png) [@plexie](https://forum.plexim.com/u/plexie)\
**Post date:** [July 28, 2026, 5:56pm UTC](https://forum.plexim.com/t/does-plecs-interpolate-the-loss-model-between-temperatures-if-the-devices-thermal-model-is-only-provided-for-certain-temperatures/3244/1 "2026-07-28T17:56:36Z")

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If the device’s thermal model is only provided for certain temperatures, does PLECS linearly interpolate between the temperatures to generate loss calculations for the device when it’s at an unspecified junction temperature?

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**Author:** ![Munadir\_Ahmed](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/munadir_ahmed/32/1540_2.png) [@Munadir\_Ahmed](https://forum.plexim.com/u/Munadir_Ahmed)\
**Post date:** [July 28, 2026, 6:11pm UTC](https://forum.plexim.com/t/does-plecs-interpolate-the-loss-model-between-temperatures-if-the-devices-thermal-model-is-only-provided-for-certain-temperatures/3244/2 "2026-07-28T18:11:49Z")

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Hi Plexie,

Yes, PLECS uses **linear interpolation and extrapolation** when evaluating thermal loss lookup tables.

You might find the following videos helpful as you get up to speed with the PLECS thermal domain:

- Thermal Modeling (Part 1): [https://www.youtube.com/watch?v=pAyjPs\_7GKc&list=PLIQ2ZTC7UCHtgpQJ1JN-i20ihiCQDiqp5&index=4](https://www.youtube.com/watch?v=pAyjPs_7GKc&list=PLIQ2ZTC7UCHtgpQJ1JN-i20ihiCQDiqp5&index=4)
- Thermal Modeling (Part 2): [https://www.youtube.com/watch?v=pAyjPs\_7GKc&list=PLIQ2ZTC7UCHtgpQJ1JN-i20ihiCQDiqp5&index=5](https://www.youtube.com/watch?v=pAyjPs_7GKc&list=PLIQ2ZTC7UCHtgpQJ1JN-i20ihiCQDiqp5&index=5)
- Thermal Modeling (Part 3): [https://www.youtube.com/watch?v=98IyBX8VZO4&list=PLIQ2ZTC7UCHtgpQJ1JN-i20ihiCQDiqp5&index=6](https://www.youtube.com/watch?v=98IyBX8VZO4&list=PLIQ2ZTC7UCHtgpQJ1JN-i20ihiCQDiqp5&index=6)

Additionally, I recommend reading through the **Thermal Modeling** section of the PLECS documentation:

> **[Thermal Modeling — PLECS 5.0 Documentation](https://docs.plexim.com/plecs/latest/thermal-modeling/)**

Hope this helps!

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<div class="post-metadata">

**Author:** ![plexie](https://avatars.discourse-cdn.com/v4/letter/p/dec6dc/32.png) [@plexie](https://forum.plexim.com/u/plexie)\
**Post date:** [July 29, 2026, 11:21pm UTC](https://forum.plexim.com/t/does-plecs-interpolate-the-loss-model-between-temperatures-if-the-devices-thermal-model-is-only-provided-for-certain-temperatures/3244/3 "2026-07-29T23:21:43Z")

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Thank you, Munadir! Really appreciate it.