2N1717S

2N1717S is a single bipolar junction transistor (BJT) manufactured by Fairchild Semiconductor. It is a PNP transistor and is manufactured in a leaded package. The transistor has 3 leads, B-Base, C-Collector, and E-Emitter. It has a maximum collector current of 500mA and a maximum collector-emitter voltage (VCE) of 45V. The maximum power dissipation is 500mW.

The 2N1717S is mainly used as a switch or amplifier in electronic circuit designs. When used as a switch, it functions by controlling the current flow between the collector and the emitter. If a voltage is applied to the base, it allows a current to flow through the transistor and it can draw power from the collector. In this way, the 2N1717S operates as an open-collector switch.

When used as an amplifier, the 2N1717S operates as an emitter follower circuit. It works by applying an input signal to the base, which causes the current to flow into the emitter. This current will be amplified by the transistor and an output signal is produced at the emitter. The voltage output is typically smaller than the voltage at the base, so in this configuration, the transistor provides a voltage gain rather than an amplified current.

The 2N1717S has a number of applications in the electronics industry, making it very versatile. It finds use in the industrial, test and measurement, automotive, consumer, and telecommunications industries as a switch or an amplifier. Some of these applications include data acquisition, motor control, power switching, power supply design, sensors and relay, and audio amplifiers.

In conclusion, the 2N1717S is a versatile single bipolar junction transistor with a wide range of application fields and working principles. It is used as an open-collector switch or an emitter-follower circuit, and can be found in many areas of electronics including consumer, automotive, industrial, and telecommunications.