♦ NPN Silicon Epitaxial Planar Transistors Top View .056 (1.43) .052 (1.33) especially suited for application in class-B video output stages of TV receivers and monitors. ♦ As complementary types, the PNP transistors BF821 and BF823 are recommended. 1 2 max. .004 (0.1) .007 (0.175) .005 (0.125).