Part Number: TCI6638K2K
HI,
In thermal model we have total body thickness as 2.975mm and in the datasheet it is given as (3.75max and 3.39min).
Which one is correct?
Attached are the snap shots of thermal model and the datasheet showing the difference in the thickness. 
thermal model read me file contents as below
The attached models are property of Texas Instruments and provided without warranty.
These models are subject to change without notice, please confirm that you have the
latest models with respect to the release of your DSP.
The thermal model within this compressed file support the following DSP(s):
TCI6638K2K
TCI6636K2H
TCI6634K2K
These models are provided without warranty.
The models contained within this compressed file are suitable various power configurations and should scale properly within the allowable configuration limits.
It is the responsibility of the end user of these files and application hardware to assure that each device does not exceed the allowable thermal conditions established and documented within each respected application note or data manual.
When no data manual exists, the maximum allowable junction temperature shall not under any condition exceed 100°C!
Failure to comply with this requirement will reduce device reliability and void any device warranty.
As always, refer to your data manual for absolute maximum operating conditions.
The following resistive values are provided for reference purposes only for the for the TCI6638K2K, TCI6636K2H, TCI6634K2K DSP models.
++Delphi Model++
Node i Node j Resistance (K/W)
Top Inner Bottom Inner 5.100000e+000
Top Inner Top Outer 1.030000e+000
Top Inner Bottom Outer 4.066489e+001
Junction 1 Top Inner 1.100000e-001
Bottom Inner Top Outer 5.039149e+002
Junction 1 Bottom Inner 1.600000e+000
Top Outer Bottom Outer 6.300000e+000
Junction 1 Top Outer 1.050000e+001
Junction 1 Bottom Outer 2.100000e+000
Junction 1 Package Side 1.860000e+000
++2R Model++
Junction Top 1.100000e-001
Junction PCB 1.650000e+000
