- A range of standard bipolar power NPN transistors in TO style cases A range of standard bipolar power NPN transistors in TO style cases. Type VCEOICPTOTCase VAWStyle 2N30556015115TO32N37714030150TO3BD139801.512.5SOT32BD23560225TO126BD23780225TO126BD243C100665TO220BD909801590TO220BD9111001590TO220MJ8029030200TO32N3055H601590TO3TIP31C100340TO220TIP3055-60-1590TO3