2N2907
Encyclopedia
The 2N2907 is 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. An "A" suffix indicates a slightly higher breakdown voltage.
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. 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.
is an equally popular (NPN) transistor complementary to the 2N2907.
Bipolar junction transistor
|- align = "center"| || PNP|- align = "center"| || NPNA bipolar transistor is a three-terminal electronic device constructed of doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons...
used for general purpose low-power amplifying
Amplifier
Generally, an amplifier or simply amp, is a device for increasing the power of a signal.In popular use, the term usually describes an electronic amplifier, in which the input "signal" is usually a voltage or a current. In audio applications, amplifiers drive the loudspeakers used in PA systems to...
or switching applications. It is designed for low to medium current
Electric current
Electric current is a flow of electric charge through a medium.This charge is typically carried by moving electrons in a conductor such as wire...
, low power
Electric power
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt.-Circuits:Electric power, like mechanical power, is represented by the letter P in electrical equations...
, medium voltage
Voltage
Voltage, otherwise known as electrical potential difference or electric tension is the difference in electric potential between two points — or the difference in electric potential energy per unit charge between two points...
, and can operate at moderately high speeds. This part number was made by several manufacturers; Texas Instruments
Texas Instruments
Texas Instruments Inc. , widely known as TI, is an American company based in Dallas, Texas, United States, which develops and commercializes semiconductor and computer technology...
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.
It is a 0.6-ampere
Ampere
The ampere , often shortened to amp, is the SI unit of electric current and is one of the seven SI base units. It is named after André-Marie Ampère , French mathematician and physicist, considered the father of electrodynamics...
, 60-volt
Volt
The volt is the SI derived unit for electric potential, electric potential difference, and electromotive force. The volt is named in honor of the Italian physicist Alessandro Volta , who invented the voltaic pile, possibly the first chemical battery.- Definition :A single volt is defined as the...
, 400-milliwatt
Watt
The watt is a derived unit of power in the International System of Units , named after the Scottish engineer James Watt . The unit, defined as one joule per second, measures the rate of energy conversion.-Definition:...
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. 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.
Related transistors
The 2N22222N2222
The 2N2222 is a common NPN 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. It is made in the TO-18 metal can as shown in the picture...
is an equally popular (NPN) transistor complementary to the 2N2907.