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A Darlington transistor is composed of two bipolar junction transistors (BJTs) cascaded together, which achieve high gain control of signals through high current amplification characteristics. Its classification can be expanded from dimensions such as structure, integration methods, and functional characteristics:
A Darlington transistor is a composite transistor structure composed of two bipolar junction transistors (BJTs) cascaded together. By connecting the emitter of the first transistor to the base of the second transistor, it achieves a significant increase in current gain. Its total current gain (β) is the product of the gains of two transistors (β ₁× β ₂), which can typically reach thousands to tens of thousands of times, far exceeding that of a single transistor.
