BDW74A-S

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Transistors - Bipolar (BJT) - Single encompass a broad range of transistors. One type of single bipolar transistor, the BDW74A-S, is a NPN low-noise amplifier generally used in the audio bandwidth. This transistor can be used in a variety of applications, and works on the principle of alternate current amplification.

BDW74A-S General Overview

The BDW74A-S is a general-purpose NPN low-noise amplifier transistor. It is housed in a TO-92 package with three pins, and is designed for audio bandwidth applications (20 Hz–20 kHz). It offers a current gain of 45 at IC=10mA and a low noise figure of 3.2 dB at a collector current of 1 mA. The BDW74A-S has a maximum voltage of 40V, a maximum collector-base voltage of 40V and a maximum emitter-base voltage of 5V. It also has a maximum collector current of 200mA and a power dissipation of 625mW.

Applications

Due to its low-noise character and audio bandwidth performance, the BDW74A-S transistor is suitable for a variety of applications. The transistor’s high current gain, low noise figure, and high power ratings make it suitable for use in audio amplifiers, preamplifiers, low distortion amplifiers, and noise canceling systems. The BDW74A-S can also be used in oscillators, receivers, and transceivers.

Working Principle

The BDW74A-S utilizes the principle of alternate current amplification. This means that the transistor amplifies the input signal by producing an output current in an alternating (AC) fashion. The transistor has three terminals: the emitter, collector, and base. The emitter is the input connection, which receives the “input” signal. This signal is then amplified by the transistor, and the result is output at the collector. The base terminal provides the voltage and bias that controls the gain and output signal.

In order for the BDW74A-S to work properly, a certain amount of bias voltage must be applied to the base terminal. This bias voltage must be within the recommended range for the specific device. For the BDW74A-S, the recommended base-emitter bias voltage is 5V. Too much or too little bias voltage will result in an unstable amplifier operation and degraded performance.

Once the proper voltage is applied to the base terminal, the transistor will collect, amplify, and output the input signal. In order to improve the amplifier’s performance, a feedback loop is often employed and the output signal is compared to the input signal. Any differences between the input and output signals are then used to adjust the voltage applied to the base terminal, thus improving the amplifier’s performance.

Conclusion

The BDW74A-S is a popular NPN low-noise amplifier transistor. It offers a current gain of 45 and a low noise figure at a collector current of 1 mA. The BDW74A-S is an ideal choice for audio bandwidth applications, such as audio amplifiers, preamplifiers, low distortion amplifiers, and noise canceling systems. The BDW74A-S works on the principle of alternate current amplification and requires a certain bias voltage to be applied to the base terminal for proper operation.

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