BB181,115 Discrete Semiconductor Products

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Diodes can be categorized into various types, based on the nature of their working principles. One such type is Variable Capacitance (Varicaps, Varactors). BB181,115 is a diode in this category and its application field and working principle are discussed in this article.

The BB181,115 is a dual NPN step recovery diode, used in bandwidth enhancement and noise reduction applications. It can act as a shunt across the signal path to short large-signal, wide-bandwidth frequency components, such as harmonics and intermodulation products, while passing the desired low-frequency signal. The diode works with an operating voltage ranging from 5V to 45V, while the maximum current rating is 0.5A.

The Varicaps, or Variable Capacitance (Varactors) diodes, use the varying reverse bias voltage to control the junction capacitance. The property of the diode is that the junction capacitance increases as the reverse voltage is increased. This junction capacitance is inversely proportional to the junction reverse-bias voltage. As the Vr increases, junction capacitance decreases and when Vr is 0, the capacitance has its maximum value.

The working of the BB181,115 can be explained as follows: When the input voltage applied across the diode increases, the internal capacitance begins to reduce, which in turn results in a decrease in the voltage across it. This decrease in voltage creates a low-impedance path for the high-frequency noise to pass, thus leading to noise reduction. The device is capable of blocking voltages higher than the operating voltage, and it has very low dynamic resistance.

The device has numerous applications. It can be used for reduce unwanted noise in audio applications and for harmonic suppression in RF systems. It can also be used for dynamic equalizing and amplitude limiting control. In many cases, it can be used as a DC Voltage regulator.

In summary, the BB181,115 diode is a Variable Capacitance (Varicaps, Varactors) diode, which is used for bandwidth enhancement and noise reduction applications. It works on the principle of reducing the internal capacitance when the input voltage is increased. It has numerous applications, but is mainly used for noise reduction and harmonic suppression in audio and RF systems, as well as for dynamic equalizing and amplitude limiter control.

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