Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. The 2N3904 is an NPN transistor that can only switch one-third the current of the 2N2222 but has otherwise similar characteristics. 2N2907 is a complementary (PNP) transistor for the 2N2222. It is available in a variety of small through-hole and surface mount packages including TO-92, SOT-23, and SOT-223. It is used in a variety of analog amplification and switching applications. All variations have a beta of at least 100 in optimal conditions. Therefore it is important to reference the datasheet for the exact device and brand. The exact specs depend on the manufacture case type and variation. It was originally made in the TO-18 metal can as shown in the picture, but is more commonly available now in the cheaper TO-92 packaging, where it is known as the PN2222 or P2N2222. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. Excerpt: The 2N2222, often referred to as the 'quad two' transistor, is a small, common NPN BJT transistor used for general purpose low-power amplifying or switching applications.
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