Officially the maximum tCase temperature for the various FX models is specified to:
Infra A - FR (125W TDP) - 61.1 degree C
Infra B - WM (95W TDP) - 70.5 degree C
Infra C - OL (65W TDP) - 70.3 degree C
Infra D - HO (45W TDP) - 69.1 degree C
Infra E - SJ (25W TDP) - 70.0 degree C
Infra F - FH (220W TDP) - 57.0 degree C
The maximum recommended temperature during the worst case stress is 65C tCase.