This document discusses the Tj max limit of SCHOTTKY rectifiers specified in the datasheet, explaining the true meaning of this parameter and why the component can operate with a junction temperature higher than Tj max in certain applications. The document also describes the thermal runaway phenomenon that causes the lower Tj max limit and provides rules for calculating the limit before thermal instability is reached. Two examples are provided to illustrate how different conditions can lead to different Tj max limits for the same diode.