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BD135 - BD136BD139 - BD140Complementary low voltage transistorFeatures Products are pre-selected in DC current gainApplication General purpose123DescriptionSOT-32These epitaxial planar transistors are mounted in the SOT-32 plastic package. They are designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits. The NPN types are the BD135 and BD139, and Figure 1. Internal schematic diagramthe complementary PNP types are the BD136 and BD140.NPN PNPTable 1. Device summaryOrder codes Marking Package PackagingBD135 BD135BD135-16 BD135-16BD136 BD136BD136-16 BD136-16BD139 BD139SOT-32 TubeBD139-10 BD139-10BD139-16 BD139-16BD140 BD140BD140-10 BD140-10BD140-16 BD140-16May 2008 Rev 5 1/9www.st.com 9Contents BD135 - BD136 - BD139 - BD140Contents1 Electrical ratings . . . . . . .