NPN silicon planar epitaxial transistor encapsulated in a plastic SOT223 SMD package. PINNING - SOT223 PIN 1 2 3 4 SYMBOL e b e c base emitter collector Fig.1 Simplified outline and symbol. DESCRIPTION emitter e 1 Top view 2 3 MAM043 - 1 QUICK REFERENCE DATA RF performance at Ts ≤ 60 °C in a com.