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Transistors - Bipolar (BJT) - Single

The PBSS302PD,115 is a bipolar-junction transistor (BJT) manufactured by NXP Semiconductors. It is available in a TO-92 case with a collector-emitter voltage of -30 Volts and a collector current of -900 mA. The transistor is used mainly in audio frequency, low-noise, and switching applications.

Application Fields

The PBSS302PD transistor is a PNP "Darlington-style" transistor, meaning that it is composed of two junctions connected in series to provide more gain than a single-junction transistor. This makes the PBSS302PD well-suited to applications requiring low noise, such as audio amplifiers, guitar preamps, and low-noise FM radios. The transistor also has a high collector-emitter voltage and current rating, making it suitable for motor control and driving applications. It can also be used as a switch to control larger currents with low-level signals.

Working Principle

Bipolar transistors, like the PBSS302PD, are three-terminal semiconductor devices. The three terminals are the emitter, the base, and the collector. When a voltage is applied to the base terminal, a current flows from the emitter to the collector, controlled by the base voltage. This current is amplified by the transistor, making it an amplifier. The amount of amplification is determined by the gain of the transistor, which is measured as the collector current divided by the base current. If a small amount of current is applied to the base of a Darlington-style transistor like the PBSS302PD, a large amount of current will be able to flow from the collector to the emitter, providing large gain and low noise.

In addition to its amplifying capability, the PBSS302PD transistor can also be used as a switch to control larger currents with low-level signals. When the voltage applied to the base terminal is higher than the turn-on threshold, the transistor will start to conduct current from the collector to the emitter. This will allow the current to flow to a larger load, such as a motor or relay. When the base voltage is lowered, the transistor will turn off and the load current will be cut off.

Conclusion

The PBSS302PD is a PNP bipolar junction transistor from NXP Semiconductors. It is a "Darlington-style" transistor, meaning it has two junctions connected in series for higher gain. This makes it well-suited for audio and low-noise applications, as well as motor control and driving. The PBSS302PD can also be used as a switch to control larger currents with low-level signals.

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