Is “Operating Temperature Range” based on Junction Temperature (Tj) or Ambient Temperature (Ta)?
“Junction Temperature,” or Tj, is the temperature within the silicon device, while “Ambient Temperature,” or Ta, is the temperature of the ambient environment in which the packaged silicon device is being used. The operating characteristics of silicon are dependent on Tj, and for a given Ta, the end-user”s circuit board (PCB), thermal management, and loading play a big role in what the final Tj will be. To allow the end-user maximum flexibility, silicon manufacturers normally do not control these factors.. Thus, the Temperature Range for a device generally relates to Junction Temperature, unless otherwise indicated. For more information about power dissipation and its effect on integrated circuits, please see “Understanding Integrated Circuit Package Power Capabilities (also known as “Appendix E” or AN-450).
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