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The 2N2907 is a commercially available electronic component, a PNP bipolar junction transistor 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. This part number was made by several manufacturers; Texas Instruments released a data sheet for their version of this part dated March 1973. 〔 ''The Transistor and Diode Data Book for Design Engineers'', Texas Instruments, Inc., no date, publication number CC-413 71242-73-CSS, page 4-151 〕 An "A" suffix indicates a slightly higher breakdown voltage. 〔 (【引用サイトリンク】 2N2907 2N2905 GENERAL PURPOSE AMPLIFIERS AND SWITCHES )〕 These transistors have an enduring popularity.〔 〕 It is a 0.6-ampere, 60-volt, 400-milliwatt transistor. The current gain of a transistor is specified with two values. Beta is the ratio of the change in collector current for a change in base current (the current gain), measured at low frequencies. The gain–bandwidth product is a measure of how the transistor gain declines with frequency due to the shunting effect of stray junction capacitance. The value varies depending on the operating conditions of the device.〔 Maurice Yunik, ''Design of modern transistor circuits'', Prentice-Hall, 1973 ISBN 0132012855, pages 247–249.〕 For the 2N2907, the gain–bandwidth product under specified test conditions, or , is 200 Megahertz, which is notionally the frequency at which the current gain drops to one. Practical use of a transistor requires that it be used for frequencies much less than . At low frequencies, the current gain (beta) is at least 100. The 2N2907 is used in a variety of analog amplification and switching applications. ==Related transistors== The 2N2222 is an equally popular NPN transistor complementary to the 2N2907. 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「2N2907」の詳細全文を読む スポンサード リンク
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