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Transistors: Construction, Types, Identification, and Testing

Learn about the construction of transistors and their different configurations. Discover how to identify and classify transistors, including their types and packaging. Understand how to bias and test transistors using transistor testers and ohmmeters. Master the process of transistor substitution.

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Transistors: Construction, Types, Identification, and Testing

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  1. Chapter 22 Bipolar Transistors

  2. Objectives • After completing this chapter, you will be able to: • Describe how a transistor is constructed and its two different configurations • Draw and label the schematic symbol for an NPN and a PNP transistor • Identify the ways of classifying transistors

  3. Objectives (cont’d.) • Identify the function of a transistor using a reference manual and the identification number (2NXXXX) • Identify commonly used transistor packages • Describe how to bias a transistor for operation • Explain how to test a transistor with both a transistor tester and an ohmmeter • Describe the process used for substituting a transistor

  4. Transistor Construction Figure 22-1. NPN transistor.

  5. Figure 22-2. PNP transistor.

  6. Transistor Types and Packaging • Transistor classifications • According to type • NPN or PNP • According to material used • Germanium or silicon • According to major use • High or low power, switching, or high frequency

  7. Transistor Types and Packaging(cont’d.) • Transistor identification • Prefix of 2N followed by up to four digits • Transistor package • Protects transistor • Provides means of electrical connection • Serves as a heat sink • Identified with letter TO (transistor outline)

  8. Transistor Types and Packaging(cont’d.) Figure 22-3. Various transistor packages.

  9. Transistor Types and Packaging(cont’d.) Figure 22-4. Typical transistor packages.

  10. Basic Transistor Operation Figure 22-5. Properly biased NPN transistor.

  11. Figure 22-6. Properly biased PNP transistor.

  12. Figure 22-7. Resistance measurements of transistor junctions.

  13. Figure 22-8. Transistor tester.

  14. Transistor Substitution Figure 22-9. How to remember the polarity of the collector voltage.

  15. Summary • A transistor is a three-layer device used to amplify and switch power and voltage • A transistor is classified according to type, material used, and major use • In a properly biased transistor, the emitter-base junction is forward biased and the collector-base junction is reverse biased

  16. Summary (cont’d.) • PNP transistor bias sources are the reverse of NPN bias sources • When a transistor is tested with an ohmmeter, each junction exhibits a low resistance when it is forward biased and a high resistance when it is reverse biased • Transistor testers are available for testing transistors in and out of circuit

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