Question

What is the symbol of transistor?

Answer 1

The symbol of a transistor depends on the type of transistor being used. There are two main types of transistors: **BJT (Bipolar Junction Transistor)** and **FET (Field-Effect Transistor)**.

### 1. **BJT (Bipolar Junction Transistor) Symbol:**
   - **NPN Transistor:**
     - The arrow on the emitter points **outward** (shows the direction of current flow).
     - The collector (C) is at the top, and the base (B) is in the middle.
   
   - **PNP Transistor:**
     - The arrow on the emitter points **inward** (shows the direction of current flow).
     - Similar to the NPN transistor, the collector (C) is at the top, and the base (B) is in the middle.

   

### 2. **FET (Field-Effect Transistor) Symbol:**
   - **N-channel MOSFET:**
     - The arrow points **outward** (indicating current flow from the gate to source).
     - The source is at the bottom, and the drain is at the top.
   
   - **P-channel MOSFET:**
     - The arrow points **inward** (indicating current flow from the source to the gate).

   

These symbols represent the basic layout of a transistor and show how current flows through it.