SMV1235-079LF Discrete Semiconductor Products

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Variable capacitors, also known as varicaps or varactors, are diodes with an adjustable capacitance. Aside from the regular capacitance that is inherent to these devices, they can also be used to vary their capacitance depending on the magnitude of the voltage applied to them. The SMV1235-079LF represents a typical example of such a capacitor.

The SMV1235-079LF is a triple-type, reverse-biased varicap diode or “voltage-variable capacitor” designed for TV tuner applications. It is designed to operate up to a peak voltage of 12V and a maximum current of 30 mA. It has a reverse leakage current of 10 nA, and a maximum capacitance of 5.4 nF. This device also features low insulation resistance and low noise.

The application of this capacitor varies depending on the exact setup and purpose, but it is most commonly applied in television tuners and radio boxes. In TV tuners, the SMV1235-079LF is used to control the local oscillator for AFT (Automatic Frequency Tuning) and AGC (Automatic Gain Control). It is additionally used, in tuners and radios alike, to provide a stable frequency by adjusting the output to maintain constant noise levels.

Now, let’s take a look at the working principle of the SMV1235-079LF. In essence, the device works by acting as a variable capacitor, whose capacitance can be adjusted by changing the voltage applied to it.

When voltage is applied to the SMV1235-079LF, the electrons flow through the diode and charge up the capacitor plates, causing them to expand. As the expansion occurs, the capacitance of the diode increases, and the amount of charge that is stored within the capacitor increases, thus varying its capacitance from 5.4 nF to much higher values depending on the magnitude of voltage applied.

Upon removal of the voltage, the electrons are removed from the capacitor plates, causing them to contract and return to their 5.4 nF starting capacitance.

Once a certain voltage value is applied to the SMV1235-079LF, this voltage value remains relatively constant, regardless of temperature or other environmental factors. This makes the diode ideal for applications such as AFT and AGC systems, where a stable frequency is required.

Overall, the SMV1235-079LF is a typical varicap diode, able to adjust its capacitance according to the magnitude of the applied voltage. Its applications range from television tuners, radios, and electronic communication systems, to name a few. As for its working principle, it can be regulated thanks to the electrons that flow through the diode which, when in contact with the capacitor plates, increase or decrease the capacitance depending on the applied voltage.

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