SN75176 Power Dissipation estimation and psi-JT

Hi Fabio,

As the SN75176 is an older device, we do not immediately have a thermal report that includes Ψ_JT.   But it is closely related to θ_JA, so you may not need it for your analysis.  Since you have:

T_J = [ ( PD_TOTAL ) * ( θ_JA ) ] + T_A

and

T_J = [ ( Ψ_JT ) * ( PD_TOTAL ) ] + T_CASE

then you know that

[ ( PD_TOTAL ) * ( θ_JA ) ] + T_A = [ ( Ψ_JT ) * ( PD_TOTAL ) ] + T_CASE

For additional information, I recommend the following application notes:

• Calculating Power Dissipation for Differential Line Drivers
• Semiconductor and IC Package Thermal Metrics

Hope this helps --