What is an NPN Transistor?
We also learnt that the junctions of the bipolar transistor can be easily biased in one of three different ways they are — Common Base, Common Emitter and Common Collector.
The construction and the terminal voltages for the bipolar NPN transistor are shown in the figure above. The voltage between the Base and Emitter of the transistor ( VBE ), is positive at the Base and negative at the Emitter because, for an NPN transistor, the Base terminal remains always positive with respect to the Emitter. The Collector supply voltage is also positive with respect to the Emitter ( VCE ). So for the case of a bipolar NPN transistor to conduct the Collector is always more positive with respect to both the Base and the Emitter.
The current gain of the transistors from the Collector terminal and to the Emitter terminal, Ic/Ie, is called Alpha, ( α ), and is a function of the transistor itself for gain applications. We know that the emitter current Ie is the sum of a very small base current plus a very large collector current, the value of alpha (α), is very close to unity and it is obvious for high gain applications where they are used and for a typical low-power signal transistor this value ranges from about 0.950 to 0.999
Introduction to 2N3771
These devices are designed for linear amplifiers, series pass regulators, and inductive switching applications and The 2N3771 is a high current switching transistor that has a collector current of 30A. It is mostly used in Linear switching devices and power supply circuits.
The above picture shows a physical description of the 2N3771 device.
2N3771 Features and Specifications
The various features and specifications of the 2N3771 are described below.
- This device is a High Power NPN Transistor.
- This device has DC Current Gain (hFE) 15 to 60
- This device has Continuous Collector current (IC) is 30A
- This device has Collector-Emitter voltage (VCE) is 40 V
- This device has Collector-Base voltage (VCB) is 50V
- This device has Emitter Base Voltage (VBE) is 5V
- This device is Available in To-3 Package which provides extra circuit security.
Pinout diagram of 2N3771
The pinout diagram of the 2N3771 is given below
From the above picture, it is seen that the use is very simple of this particular Transistor in any circuit.
Applications of 2N3771
The various applications of the 2N3771 are discussed below
- This device is used in Linear switching circuits
- This device is used for making Small Amplifiers
- This device is also used in Power supply circuits
- This device is used in Inductive load switching
- This device is used in high current switching (up to 20A) loads
Above circuit shows a rectifier circuit using this transistor
2N3771 Alternatives/replacement/substitute/complementary
The following transistors can also be used as a replacement to the
Conclusion
The most commonly used in the electronic circuits transistor configuration is the NPN Transistor. now you can find them at UtSource.net at a very low price.
