Transistor Lecture

1. TRANSISTOR

7. E B C E B C R R Higher resistance Lower resistance

9. R R

10. To simplify the understanding, a bipolar transistor can be viewed as two diodes facing each other in NPN and with their backs to each other in PNP transistors. NPN (Negative Positive Negative) PNP (Positive Negative Positive)

12. forward forward forward forward NPN PNP

13. R R R base-collector base-emitter NPN emitter-collector

14. The first and second tests are diode tests of front and back resistances. The third is leakages current test and should indicate high resistance in a good transistor. forward reverse leakage current C B E E B C E B C

15. C B E E B C base-emitter

16. C B E E B C R R base-collector

17. C B E E B C R R emitter-collector

18. E B C C B E R R base-emitter shorted

19. C B E E B C R R base-collector open

20. E B C C B E R R emitter-collector leak shorted

21. C B E E B C Silicon transistor Germanium transistor emitter- collector no leakage little leakage good

24. The End.

25. Prepared by: Maika A. De Torres IV-Narra