NPN switching transistor in a TO-39 metal package. 1 handbook, halfpage 2 BSX32 PINNING PIN 1 2 3 emitter base collector, connected to case DESCRIPTION 3 2 3 MAM317 1 Fig.1 Simplified outline (TO-39) and symbol. QUICK REFERENCE DATA SYMBOL VCBO VCEO IC Ptot hFE fT toff PARAMETER collector-bas.