The important part of the datasheet is often the fine print.
Under Electrical Characteristics under the table
(2) With device Pins 3, 4, 5, 10, 11, 12 soldered into a 1/16″ epoxy glass board with 2 ounce copper foil with a minimum surface of 6 square inches.
Above that the ABSOLUTE Maximum Ratings
Thermal Resistance
θ JC (14-Pin PDIP) 30°C/W
θ JC (8-Pin PDIP) 37°C/W
θ JA (14-Pin PDIP) 79°C/W
θ JA (8-Pin PDIP) 107°C/W
(1) "Absolute Maximum Ratings" indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The package is to be derated at 15°C/W junction to heat sink pins for 14-pin pkg; 75°C/W for 8-pin.
Learn how to apply Ohm's Law for THermal Resistance from Junction to Case to Board to inside Ambient to Outside Ambient.