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Identifying transistor leads and testing PNP vs NPN types

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Transistor Lecture

1 of 25
TRANSISTOR
Contents: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Transistors ,[object Object]
[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object]
E B C E B C R R Higher resistance Lower resistance
[object Object],[object Object]
R R
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)
[object Object]
forward forward forward forward NPN PNP
R R R base-collector base-emitter NPN emitter-collector
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
C B E E B C base-emitter
C B E E B C R R base-collector
C B E E B C R R emitter-collector
E B C C B E R R base-emitter shorted
C B E E B C R R base-collector open
E B C C B E R R emitter-collector leak shorted
C B E E B C Silicon transistor Germanium transistor emitter- collector no leakage little leakage good
[object Object],[object Object]
[object Object]
The End.
Prepared by: Maika A. De Torres IV-Narra

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Identifying transistor leads and testing PNP vs NPN types

  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7. E B C E B C R R Higher resistance Lower resistance
  • 8.
  • 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)
  • 11.
  • 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
  • 22.
  • 23.
  • 25. Prepared by: Maika A. De Torres IV-Narra