BC807K-40VL

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A BC807K-40VL is a bipolar junction transistor (BJT) designed for use in small signal and general-purpose amplifier applications. It is a widely used, low-cost device that provides good power gain and stability. The BC807K-40VL is available in a metal TO-92 package, which is relatively low cost, but provides good thermal stability.

Overview

The BC807K-40VL is a low-noise, high gain voltage amplifier with a maximum power dissipation rating of 1 watt. It has a rather low VCBO rating of 40 volts, allowing it to be used in low-voltage circuits. It has a DC current gain that ranges from 90 to 200, with a typical gain of 140. It features a low noise voltage of 130μV and a high output current capability of 1A. In terms of electrical characteristics, the BC807K-40VL has an emitter-base cut-off voltage of 5V and a maximum collector-base voltage rating of 50V. The device can operate over a wide temperature range of -65°C to +150°C.

Application Field

The BC807K-40VL is typically used as a pre-driver for other linear transistors. Its small size and low cost make it suitable for use in many low-voltage, low-power amplifier and switching applications. Some of its typical applications include transmitters and amplifiers, SSB receivers, VHF transceivers, and audio pre-amps. It is used primarily as an input amplifier due to its low noise figure and high current gain. It is well suited for use in portable and battery powered electronics, where its low power draw can prolong the life of the device.

Working Principle

The BC807K-40VL is made up of a single n-p-n transistor that forms the input-output junction. It works by controlling the flow of current between the base and collector electrodes. The current gain of the device is controlled by the amount of base current applied, which determines the amount of current output from the collector. The current amplification occurs as electric charge carriers, either electrons or holes, pass between the emitter and the collector. The emitter-base junction acts as a voltage controlled switch, allowing the current to flow between the collector and the base. As a result, the base current controls the output current, which in turn amplifies the input signal.

Conclusion

The BC807K-40VL is a low-cost, low-noise, and high-gain single transistor structure with a long list of applications. It has a maximum power dissipation rating of 1 watt and a DC current gain of up to 200. It is used mainly as a pre-driver, as it has a low noise voltage and a high output current capability. In summary, the BC807K-40VL is an ideal choice for low-power, low-voltage applications, such as transmitters, amplifiers, SSB receivers, VHF transceivers, and audio pre-amps.

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