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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. It is made in the TO-18 metal can as shown in the picture. The 2N2222 is considered a very common transistor,〔Dan O'Sullivan, Tom Igoe; "Physical Computing"; Cengage Learning; pp.19; 2004; ISBN 1-59200-346-X〕〔Brad Graham, Kathy McGowan; "Mind Performance Projects for the Evil Genius"; McGraw Hill Professional; pp.18; 2010; ISBN 978-0-07-162392-6〕〔Brad Graham, Kathy McGowan; "51 High-Tech Practical Jokes for the Evil Genius"; McGraw Hill Professional; pp.12; 2007; ISBN 978-0-07-149494-6〕 and is used as an exemplar of an NPN transistor. It is frequently used as a small-signal transistor,〔Gordon McComb; "The Robot Builder's Bonanza"; McGraw-Hill Professional; 2001; pp.261; ISBN 978-0-07-136296-2〕〔William Rynone; "Linear Active Circuits — Design and Analysis"; Artech House; pp.19; 1986; ISBN 0-89006-199-8〕 and it remains a small general purpose transistor〔Dennis Barnaal, "Analog and Digital Electronics for Scientific Application"; Breton Publishers; pp.301; 1982; ISBN 0-534-01044-X〕 of enduring popularity.〔 〕〔 〕〔 〕 The 2N2222 was part of a family of devices described by Motorola at a 1962 IRE convention.〔http://www.semiconductormuseum.com/Transistors/Motorola/Haenichen/Haenichen_Page11.htm Haenichen oral history retrieved from the Semiconductor Museum 2011 May 13〕 Since then it has been made by many semiconductor companies, for example, Texas Instruments.〔''The Transistor and Diode Data Book for Design Engineers'', Texas Instruments Incorporated, no date, TI publication number CC413 71242-73-CSS, page 4-93〕 ==Specifications== The JEDEC registration of a device number ensures particular rated values will be met by all parts offered under that number. JEDEC registered parameters include outline dimensions, small-signal current gain, transition frequency, maximum values for voltage withstand, current rating, power dissipation and temperature rating, and others, measured under standard test conditions. Other part numbers will have different parameters. The exact specifications depend on the manufacturer, case type, and variation. Therefore, it is important to refer to the datasheet for the exact part number and manufacturer. 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「2N2222」の詳細全文を読む スポンサード リンク
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