BB179B,135

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Variable capacitance diodes, or varicaps, are an emerging technology that has been gaining ground in recent years as an effective and cost-efficient solution for electronic designs that require increased capacitance. They are often referred to as varactors, which is an acronym for "variable capacitance sandwich." These diodes are comprised of two layers of semiconductor material (usually aluminum, silicon, or gallium arsenide) that are separated by a thin dielectric material (typically antimony sulfide). They provide a range of capacitance values from very small levels through to very large values.

The BB179B,135 is a type of varicap diode. It is a small-signal varicap diode used for tuned radio-frequency (RF) circuits and has a capacitance range of 0.9 pF to 4.7 pF. With a reverse voltage of 7.5 V and an operating temperature range of -40 to 85 °C, it is built to cope with the demands of harsh environments. It is also relatively tolerant of small amounts of reverse leakage current, making it a reliable choice for many design requirements.

The principle of operation of a varicap diode is straightforward: when the reverse voltage applied to the diode increases, the capacitance of the diode also increases. This is because the reverse voltage causes a repulsive force that allows the two layers of semiconductor material to “pull away” from each other, increasing the distance between them and consequently increasing the diode’s capacitance.

The resulting generated capacitance can be used to modulate the signal strength in radio receivers, allowing them to tune in to different radio frequencies. Additionally, the precise and reliable capacitance regulation provided by varicap diodes makes them an excellent choice for applications involving frequency trimming and high-frequency signal modulation. Moreover, they are especially useful in circuits used for tuning, picking up, and transmitting signals in wireless audio devices, handheld radios, and satellite TV receivers.

Varicap diodes also find use in radio transceivers, where they are used to couple signals between stages. Other applications include audio amplifiers, RF circuits, and filters as well as oscillators and pulse amplitude modulation (PAM) circuits. In virtually every application that has traditionally relied on a capacitor to regulate signals, the BB179B,135 can provide a cost-effective solution.

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