Multiple-emitter transistor

Multiple-emitter transistor is the specialized bipolar transistor mostly used at input of the TTL NAND logic gates. Than input signals are applied to the emitters, the collector current stop flowing only if all emitters are driven by the logical high potential, thus performing AND logical operation. Multiple emitter transistor replaces diodes in the DTL and allows reduction of switching time and power dissipation.

See also

RTL Logic families Double_Gate_Transistor