BCX18,215

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BCX18,215 is a type of single Bipolar Junction Transistor (BJT). It is widely used in various applications, notably in consumer electronics, industrial instruments, and general-purpose amplification and switching. Primarily, BCX18,215 is used in designs requiring low-power, low-noise and low-voltage operation. In order to obtain a good approximation of the value of the electrical parameters, the operating temperature should be taken into account.

Device Overview

The BCX18,215 is a single Bipolar junction transistor, usually available in TO-220 packaging and is made up of two N-Channel BJTs connected in a Darlington configuration with a small base connection. The Darlington configuration provides a high current gain and low-noise operation, making it ideal for low-frequency applications.

Its wide range of features also makes it suitable for a variety of application fields, from audio amplifiers, low-frequency power switches, and low-power analog switches, to low-voltage and high-current linear amplification.

Operating Conditions and Characteristics

HCX18,215 is an NPN transistor, that is, the emitter is Negative and the collector is Positive. Its low current-gain of typically between 25 to 50, and a maximum Collector-Emitter voltage of 30V make it suitable for applications such as low-noise audio amplifiers and switching applications operating at low frequency, below 1MHz. It has a very low saturation voltage, as low as 0.2V, which makes it ideal for applications where low distortion is needed.

Also, the device can operate up to 70°C and carries a high current rating of 0.5A. Furthermore, it has a high reverse current gain (hfe) of approximately 5000, making it suitable for high frequency applications. However, its lower output resistance may make the device unsuitable for higher power applications.

Applications

Given its features and low-power operation characteristics, BCX18,215 can be widely used in consumer electronics, industrial instruments, and general-purpose amplification and switching. Common applications include low-noise audio amplifiers, low-frequency switching, low-voltage linear amplification, high-current linear amplification, and low-power analog switches.

For example, BCX18,215 can be used in audio amplifiers requiring low-noise and low-distortion performance. It can also be used in switching applications where low power consumption is critical, such as in power adapters, mobile phone accessories, and RF communication devices. In addition, its low saturation voltage makes it suitable for use in low-voltage linear amplification, notably in amplifiers operating from a single supply. The device is also suitable for high-current applications, such as motor control.

Working Principle

The BCX18,215 is a two-NPN BJT housed in a TO-220 package. It works as any other BJT, as a current-controlled current source. This means that its Collector current (Ic) is a function of its Base current (Ib). The Collector current is equal to the Beta (hfe) times the Base current, multiplied by the Collector-Emitter voltage (Vce). The Collector current is also affected by the current flowing through the Emitter, thus, the device can also operate as a current-controlled voltage source.

The main advantage of the device is its Darlington configuration, which provides a large current gain, low-noise, and low-power operations. The Darlington configuration consists of two NPN BJTs connected in series, with the emitters connected together and the collectors connected to each other with a resistor network. This configuration, combined with the low current gain and low saturation voltage, results in low-noise and low power operation.

Conclusion

The BCX18,215 is a type of single Bipolar junction Transistor (BJT) that offers a wide range of features and can be used in a variety of applications requiring low-power and low-noise operation. It has a wide current gain range, low collector-emitter voltage, low saturation voltage, and can operate up to 70°C. Common applications include low-noise audio amplifiers, low-frequency switching, low-voltage linear amplification, high-current linear amplification, and low-power analog switches. The BCX18,215 is a reliable and cost-effective device and is ideal for applications where low-power and low-frequency operation are desired.

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