PNP power transistor in a TO-126; SOT32 plastic package. NPN complement: BD230. handbook, halfpage BD231 PINNING PIN 1 2 3 emitter collector, connected to metal part of mounting surface base DESCRIPTION 2 3 1 1 2 3 Top view MAM272 Fig.1 Simplified outline (TO-126; SOT32) and symbol. LIMITI.