2N2907 Transistor (PNP Analog Amplification and Switching Transistor)

The 2N2907 is a commonly available 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 transistor was made by several manufacturers; Texas Instruments released a data sheet for their version of this part dated March 1973. An "A" suffix indicates a slightly higher breakdown voltage. These transistors have an enduring popularity with electronics hobbyists. It is a 0.6-ampere, 60-volt, 400-milliwatt transistor. For the 2N2907, the gain–bandwidth product under specified test conditions, or fT, 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 fT. At low frequencies, the current gain (beta) is at least 100. The 2N2907 is used in a variety of analog amplification and switching applications.