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2N2222A NPN Transistor (Pack of 5) Eye Blink Sensor Solar Energy Storage: Pair with```html 2N2222A NPN Transistor (Pack of 5) The 2N2222A is one of the most popular and versatile general purpose NPN bipolar junction transistors (BJTs) in electronics. Ideal for low power switching, signal amplification, and a wide range of driver circuits, this TO 92 packaged transistor is a must have staple for every engineer's component kit. This pack of 5 ensures you always have spares on hand for prototyping, repairs, and project builds.