SN54AC32: junction to case thermal resistance

Hi Suzanne,

I have submitted this request to my thermal modelling team. It usually takes 2 weeks to get this back, but with it being the end of the year, it may take a bit longer.

Do you expect to be consuming a lot of power through this OR gate during operation? I don't see them used for power delivery or high speed apps very often.

Thanks for your response. The power dissipations in this part is small- 0.15 W

We'll definitely get that model for you, but to save you time I can give you an idea of the value we should get back -- maybe you can get an estimate & work with that for now.

I pulled values from a similar gate (SN54HC02, W package):

RθJC(top) = 89.6 °C/W

RθJB = 164.1 °C/W

RθJC(bot) = 15.5 °C/W

Great, thank you- this will help in building an initial approximate thermal model and analysis in the meantime