[FAQ] How do SOT23 and SOT563 packages thermal performance compare?

SOT23-6 (DDC) package offers the coolest solution between the three packages. For applications where solution size matters the most, the SOT563 (DRL) package offers the smallest size with best light load efficiency among the three packages, without compromising thermal performances and cost. SOT23-5 package has the highest junction temperature from the three packages, by about 10°C, at comparable operating conditions.

The following application note summarizes the thermal results for all three packages and explains the advantages and disadvantages for application design:

"Comparing the Performance and Thermal Properties of a DC/DC Converter in the SOT23 and new SOT563 Packaging Technologies"