Maximum Junction Temperature of ADM3491 is not available in datasheet. Please provide the same
The junction temperature for the part can be calculated if we know what the power dissipation is:
Tj = TA + θja*Pdiss
The 14-ld N-SOIC ADM3491 has a θJA Thermal Impedance of 86°C/W (for a 4layer board).
The ADM3491 dissipates about 0.25 W in a typical application.
For a thermal impedance of 86°C/W and a Max. ambient temperature of 85C the corresponding Junction temperature is 107C.
If you have concerns about operating at higher than +85C ambient, then the ADM3076E is an alternative part that can operate at up to +125C ambient.