La letra griega alfa (?) se utiliza para designar la ganancia estática de corriente de un transistor en la configuración de base común. Se trata de la relación existente entre la corriente de colector y la corriente de emisor en un transistor configurado de la manera mostrada en la figura 1.


 

 

 

 

Podemos expresar esa ganancia por la fórmula:

α = Ic / Ie

 

Donde:

α = ganancia estática de corriente en base común

Ic = corriente de colector

Ib = corriente de emisor

Las unidades de corriente de emisor y colector deben ser las mismas.

Se trata, pues, del número de veces que una señal se amplía en esta configuración. El lector que el alfa de un transistor es siempre menor que 1. Tanto mejor será el transistor como amplificador cuanto más ese número se acerque a 1.

Esto ocurre porque la corriente de emisor es siempre mayor que la corriente de colector. Como la impedancia de salida de este circuito es muy baja en relación a la impedancia de entrada, aunque no haya aumento de corriente (menor que 1), existe una ganancia de potencia, lo que hace factible el uso del transistor como amplificador de esta manera. Ver en el almanaque la tabla de conversión entre alfa y beta.

 

 

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