December 18, 2016

LM338K - 5A linear regulator in TO-3 : weekend die-shot

Die size 1834x1609 ┬Ám.

You can see why this giant package is nearly obsolete these days (it's been around since 1955) - tiny crystal on a large steel case is largely limited by steel thermal conduction. Modern packages with copper base could do better with much smaller packages.