Columns: Prefix class | Type and usage | Example | Equivalent | Reference
AC | Germanium small-signal AF transistor | AC126 | NTE102A | Datasheet | AD | Germanium AF power transistor | AD133 | NTE179 | Datasheet | AF | Germanium small-signal RF transistor | AF117 | NTE160 | Datasheet | AL | Germanium RF power transistor | ALZ10 | NTE100 | Datasheet | AS | Germanium switching transistor | ASY28 | NTE101 | Datasheet | AU | Germanium power switching transistor | AU103 | NTE127 | Datasheet | BD | Silicon, power transistor | BD139 | NTE375 | Datasheet | BF | Silicon, RF (high frequency) BJT or FET | BF245 | NTE133 | Datasheet