Transistor 2N3904, 2N2222, BC557, and BC547 Pinout Diagram

A transistor electronic semiconductor active device that is used to amplify or switch the electrical or electronic signal. Most of the transistors are three-terminal devices. According to the charge carrier, the transistor is classified into two types - BJT(Bipolar Junction Transistor), and UJT(Unipolar Junction Transistor). BJT has three terminals - Emitter, Base, and Collector whereas FET(Field Effect Transistor) has three terminals - Drain, Gate, and Source. In this article, we are going to see some examples of transistors with their numbers and pinout diagrams.

Transistor 2N3904 Pinout Diagram

Transistor 2N2222 Pinout Diagram

The transistor 2N2222 is an NPN Transistor. It has three terminals - 1. Emitter 2. Base 3. Collector

Its, Base terminal is connected to the 'P' Type material whereas the emitter and collector are connected to the 'N' type material. Now, the question is how to identify the terminal of the transistor. It is very simple. For this transistor, keep the flat side of the transistor towards your face. Now, the left side terminal is the emitter, the middle terminal is the base, and the right side terminal is the collector. Also, you can see the symbolic diagram for better understanding.

Transistor BC557 Pinout Diagram

The transistor BC557 is a PNP transistor. It has three terminals - 1. Collector 2. Base 3. Emitter

Its base terminal is connected to the 'N' type material whereas the emitter and collector terminal is connected to the 'P' type material. It is a three-layer, two-junction transistor. When you keep the flat side of the transistor towards your face, the left-side terminal will be the Collector, the middle terminal will be the Base and the right-side terminal will be the Emitter.

Transistor BC547 Pinout Diagram

The transistor BC547 is an NPN transistor. It also has three terminals - 1. Collector 2. Base 3. Emitter

When you keep the flat side of the transistor towards your face, the left-side terminal is the Collector, the middle terminal is the Base, and the right-side terminal is the emitter. It is also a three-layer, two-junction transistor.

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