![]() ![]() is also known as hFE and may appear on data sheets and in some textbooks as such.We must try and allow for these variations in circuit design.Ĭommon Emitter Characteristics For example α = 0.98, β = 49 α = 0.99, β = 99 α = 0.995, β =199.A small change in α causes a much bigger change in ß which means that ß can vary significantly, even from transistor to transistor of the same type. ![]() For a practical (non-ideal) transistor this is only true at a particular bias (operating) point.We note, in passing that, if β can be regarded as a constant for a given transistor then.Since reverse saturation current is negligible the second term on the right hand side of this equation can usually be neglected (even though (1- α) is small). ![]()
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