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== 2N2222 Transistor ==

https://en.wikipedia.org/wiki/2N2222

The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds.

The 2N2222 is considered a very common transistor, and is used as an exemplar of an NPN transistor. It is frequently used as a small-signal transistor, and it remains a small general purpose transistor of enduring popularity.

NPN silicon transistors with similar properties are also made in a variety of small through-hole and surface mount packages including TO-92, SOT-23, and SOT-223.

The 2N2907 is an equally popular PNP transistor complementary to the 2N2222.

<pre>
Vce	Ic	PD		fT
40 V	800 mA	500 mW/1.8 W	300 MHz
</pre>

All variations have a beta or current gain (hFE) of at least 100 in optimal conditions. It is used in a variety of analog amplification and switching applications.

<img src="https://upload.wikimedia.org/wikipedia/commons/a/ae/2N2222,_PN2222,_and_P2N2222_BJT_Pinout.jpg" width="400"/>

<img src="http://www.instock.pk/media/tmp/catalog/product/2/n/2n2222.jpg" width="400"/>