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Transistors are little electronic switches. There are quite a few different types of transistor available, and each have their own characteristics, advantages and disadvantages. They can be used to switch and amplify low-level signals, but can also function well as standalone electronic switches for devices such as motors, LED's or solenoids. Other specialist transistors, such as phototrransistors, respond to the amount of light shining on it in order to produce a current flow.
This is a current controlled Bipolar Junction Transistor (BJT), which is made up of 3 regions: the base, the collector, and the emitter. A small current entering in the base region of the transistor causes a much larger current to flow from the emitter to the collector region. BJT's have the lowest impedance of all transistors, and therefore allow current to flow through the base of the transistor, which results in high amplification.
This is a BC547B NPN Bipolar Transistor, designed for use in linear and switching applications, and is housed in the neat TO-92 package. It's especially suited for use in general signal processes, for example that of audio amplifiers, low noise input stages of tape recorders, HI-FI amplifiers and signal processing circuits for IR receivers. They can switch up to 45V @ 100mA continuous, or 200mA peak with a DC gain of 200.
Collector Emitter Voltage V(br)ceo: 45V
DC Collector Current Continuous: 100mA
DC Collector Current Peak: 200mA
DC Current Gain hFE: 200
No. of Pins: 3
Operating Temperature Max: 150°C
Power Dissipation Pd: 625mW
Transistor Case Style: TO-92
Transistor Polarity: NPN
Transition Frequency ft: 300MHz