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Explain how you can determine the pin out, material type, and whether a BJT is pnp or npn using only a diode checking function.

Explain how you can determine the pin out, material type, and whether a BJT is pnp or npn using only a diode checking function.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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**Understanding BJT Configuration Using a Diode Checking Function** To determine the pin configuration, material type, and whether a Bipolar Junction Transistor (BJT) is PNP or NPN using only a diode checking function, follow these steps: 1. **Identify the Emitter, Base, and Collector:** - Use the multimeter's diode function to test between each pair of pins. - One of the pin pairs will show a forward voltage similar to that of a diode. This will help identify the base pin since the BJT acts like two diodes back-to-back with the base as the common terminal. 2. **Determine the Type (PNP or NPN):** - If the base pin shows a forward voltage when connected to the positive lead of the multimeter with the negative lead on the other pins, it is an NPN transistor. - If the base pin shows a forward voltage when connected to the negative lead of the multimeter with the positive lead on the other pins, it is a PNP transistor. 3. **Identify the Material Type (Silicon or Germanium):** - Measure the forward voltage drop across the base-emitter and base-collector junctions. - Silicon BJTs typically have a forward voltage drop of about 0.6 to 0.7 volts. - Germanium BJTs have a lower forward voltage drop, usually around 0.2 to 0.3 volts. By following these steps, you can systematically identify the characteristics of a BJT using only the diode checking function of a multimeter.
Transcribed Image Text:**Understanding BJT Configuration Using a Diode Checking Function** To determine the pin configuration, material type, and whether a Bipolar Junction Transistor (BJT) is PNP or NPN using only a diode checking function, follow these steps: 1. **Identify the Emitter, Base, and Collector:** - Use the multimeter's diode function to test between each pair of pins. - One of the pin pairs will show a forward voltage similar to that of a diode. This will help identify the base pin since the BJT acts like two diodes back-to-back with the base as the common terminal. 2. **Determine the Type (PNP or NPN):** - If the base pin shows a forward voltage when connected to the positive lead of the multimeter with the negative lead on the other pins, it is an NPN transistor. - If the base pin shows a forward voltage when connected to the negative lead of the multimeter with the positive lead on the other pins, it is a PNP transistor. 3. **Identify the Material Type (Silicon or Germanium):** - Measure the forward voltage drop across the base-emitter and base-collector junctions. - Silicon BJTs typically have a forward voltage drop of about 0.6 to 0.7 volts. - Germanium BJTs have a lower forward voltage drop, usually around 0.2 to 0.3 volts. By following these steps, you can systematically identify the characteristics of a BJT using only the diode checking function of a multimeter.
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