prefix class                            type and usage example equivalent  reference
0           ac    germanium small - signal af transistor   ac126    nte102a  datasheet
1           ad             germanium af power transistor   ad133     nte179  datasheet
2           af    germanium small - signal rf transistor   af117     nte160  datasheet
3           al             germanium rf power transistor   alz10     nte100  datasheet
4           as            germanium switching transistor   asy28     nte101  datasheet
5           au      germanium power switching transistor   au103     nte127  datasheet
6           bd                silicon , power transistor   bd139     nte375  datasheet
7           bf  silicon , rf (high frequency) bjt or fet   bf245     nte133  datasheet

Table as JSON:
{"prefix class":{"0":"ac","1":"ad","2":"af","3":"al","4":"as","5":"au","6":"bd","7":"bf"},"type and usage":{"0":"germanium small - signal af transistor","1":"germanium af power transistor","2":"germanium small - signal rf transistor","3":"germanium rf power transistor","4":"germanium switching transistor","5":"germanium power switching transistor","6":"silicon , power transistor","7":"silicon , rf (high frequency) bjt or fet"},"example":{"0":"ac126","1":"ad133","2":"af117","3":"alz10","4":"asy28","5":"au103","6":"bd139","7":"bf245"},"equivalent":{"0":"nte102a","1":"nte179","2":"nte160","3":"nte100","4":"nte101","5":"nte127","6":"nte375","7":"nte133"},"reference":{"0":"datasheet","1":"datasheet","2":"datasheet","3":"datasheet","4":"datasheet","5":"datasheet","6":"datasheet","7":"datasheet"}}