PN2907ATA Discrete Semiconductor Products

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PN2907A is a type of bipolar junction transistor (BJT) and is also part of the class of single transistors. This transistor is a PNP type and is commonly used for power switching applications; for example switching motors, relays, and household appliances on and off. Often considered more efficient than mechanical contacts, PN2907A transistor power switching offers many advantages. These include low power consumption and minimization of contact arcing and sparking.

This type of transistor is made up of an emitter, base and collector. A small electrical current applied to the base, controls a much larger current flowing between collector and emitter. When the base current is ‘on’, it acts as a closed switch and the transistor switches ‘on’ current flow across the collector and emitter. In this mode, the device is referred to as ‘saturated’. As the base current is ‘off’, it acts as an open switch and the transistor switches ‘off’ current flow across the collector and emitter. In this mode the transistor is referred to as ‘cut off’.

PN2907A can be used in many different circuits and designs. These applications include but are not limited to amplifier common-emitter configurations, voltage-regulator transistors connected to a Zener diode, Darlington transistor stages and power amplifiers. An example of one application is an amplifier circuit that boosts a low audio signal such as from a microphone and amplifies it to a much louder signal. This is achieved by adding a current gain to the signal. In this application, the PN2907A transistor acts as a voltage amplifier.

When selecting this type of transistor, there are many different performance characteristics to consider. Some important characteristics include collector-emitter breakdown voltage, collector-emitter saturation voltage, base-emitter saturation voltage and collector-emitter off-state current. Common package types include the SOT-23, TO-92, and SO-8 packages. Often, the devices have been characterized so they are suitable for use in applications like switching power supplies, as they manipulate and control direct current levels. A microcontroller application may also be suitable.

PN2907A transistors are efficient; power consumption is low when compared against other transistor designs. Due to their reduced dimensions and the ability to provide more than one amplifier at a time, these are the preferred choice of transistor in many applications. It is also cost-effective, allowing the use of a small number of transistors to control a high current load. Furthermore, due to the fact that these transistors have a very low input current, they are the ideal choice when applying much higher voltage with low current.

For optimum results, the PN2907A is best used in circuits with high current loads that require precise control. The base-emitter voltage should not exceed its maximum limit of 10 volts as this can cause failure of the transistor. When used correctly, the PN2907A transistor can provide many years of reliable service in various applications.

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