The Darlington transistor is also known as a composite transistor. It is two transistor dies in series, encapsulated into an equivalent transistor. The amplification coefficient of the equivalent transistor is the product of two transistors, so its amplification is very high. The Darlington transistor can amplify very small signals and is commonly used in power amplifiers and voltage regulators.
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TIP122 NPN Darlington Power Transistors TO-220
