# Possible error in thermal description of GaN Systems PLECS Model

**URL:** <https://forum.plexim.com/t/possible-error-in-thermal-description-of-gan-systems-plecs-model/1353>\
**Category:** PLECS\
**Tags:** thermal-model, thermal-description, gan-systems, thermal-chain\
**Created:** [April 24, 2024, 11:04am UTC](https://forum.plexim.com/t/possible-error-in-thermal-description-of-gan-systems-plecs-model/1353 "2024-04-24T11:04:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![niklas21](https://avatars.discourse-cdn.com/v4/letter/n/e47774/32.png) [@niklas21](https://forum.plexim.com/u/niklas21)\
**Post date:** [April 24, 2024, 11:04am UTC](https://forum.plexim.com/t/possible-error-in-thermal-description-of-gan-systems-plecs-model/1353/1 "2024-04-24T11:04:50Z")

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Hi,

I was working on simulations with the GaN Systems model, especially GS-065-060 and GS66516, noticing that the GS66516 has a much worse transient thermal performance. I figured out that it has something to do with the thermal chain. While comparing those in the thermal description with the datasheet I think I found an error.

The Cth,3 is 0.0012 J/K in the thermal description but in the datasheet it is 0.012 J/K.  
This causes a temperature deviation of 45 K in my case and prevents to get proper simulation results.

I might have overseen something. I am sorry if this is the case. But I looked more than twice.

Thank you for a reply!

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**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\
**Post date:** [April 24, 2024, 6:24pm UTC](https://forum.plexim.com/t/possible-error-in-thermal-description-of-gan-systems-plecs-model/1353/2 "2024-04-24T18:24:20Z")

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Hi, seems that you are right, we will notify the manufacturer!