| BJT(Bipolar Junction Transistor) | FET(Field Effect Transistor) |
| In BJT Current is carried by both Electrons and Holes | In FET Current is carried by only one type of charge particals,either electrons or holes |
| It is also known as Bipolar device | It is also known as Unipolar device |
| The current flow is controlled by input current | The current flow is controlled by an electric field setup in the device by an external applied voltage |
| BJT is a Current Controlled Device | FET is a Voltage Controlled Device |
| BJT has low input impedance | FET has high input impedance |
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