The BD136, BD138 and BD140 are silicon epitaxial planar PNP transistors in Jedec SOT-32 plastic package, designed for audio amplifiers and drivers utilizing complementary or quasi compementary circuits.
The BC161 is a silicon planar epitaxial PNP transistors in Jedec TO-39 metal case. They are particularly designed for audio amplifiers and switching application up to 1A. The complementary NPN type is the BC141.
The BDX53C is a silicon epitaxial-base NPN power transistors in monolithic Darlington configuration and is mounted in Jedec TO-220 plastic package. It is intented for use in hammer drivers, audio amplifiers and other medium power linear and switching appl