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Pin2 (Base): The base pin is a control pin & it is a second pin of the transistor.

The main function of this pin is to provide transistor current toward the o/p load.

Pin1 (Collector): This is the first pin of the transistor & it is an o/p pin.

This transistor includes three pins & its each pin functionality is discussed below. The pin configuration of the 2N2222A transistor is shown below. It functions on the value of high transition frequency like 250MHz through 10ns delay time, 225ms storage time, 60ms fall time & 25ms rise time. 2N2222A transistor offers constant DC collector current like 800mA, so it is necessary to use where low to medium current is necessary.