1SV281(TPH3,F) Discrete Semiconductor Products

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Variable capacitance diodes, commonly referred to as Varicaps or Varactors, are widely used in frequency control and tuning circuits. They are highly sensitive to changes in input voltage and can thus act as voltage-variable capacitors. This makes them a critical component in frequency-selective and voltage-controlled oscillator (VCO) circuits.

A device classified as a variable capacitance diode is a diode with an internal electric field, which can be modulated in order to vary its capacitance. Thus, when the input voltage applied to the diode varies, the electric field changes correspondingly and the diode\'s capacitance can be adjusted slightly.

The 1SV281(TPH3,F) product is a Varicap Diode manufactured by Temic, a subsidiary of the German electronics manufacturer Siemens. The 1SV281 is a 900pF to 1.1nF voltage-variable high-capacity device with a direct current voltage rating of up to 20V. It is designed for use in VCO, frequency-selective and FM demodulator circuits, and is also suitable for use in TV tuners and amplifiers.

The 1SV281 operates on three principles. The first is the modulation of the width of its depletion region, which is done by varying the applied voltage. A higher voltage results in a wider depletion region, leading to an increased dielectric constant and thus increased capacitance. The second principle is the changing of the angle of the junction, which is modeled by a variable capacitance when the applied voltage is high enough. The third principle is the shifting of the electrode-junction boundary, which causes a lower depletion region at higher applied voltages and a higher capacitance.

The 1SV281 is a reliable and highly versatile variable capacitance device, which makes it suitable for use in a wide range of applications. Its performance is particularly beneficial in frequency modulation and demodulation, as well as frequency-selective networks, diversity receivers and voltage-controlled oscillators. It can also be used in tuning circuits for television, VCRs and radios, as well as audio amplifiers and preamplifiers.

In summary, the 1SV281 from Temic is a versatile Varicap Diode with a maximum capacitance of 1.1nF, and offers reliable performance in applications such as frequency modulation and demodulation, frequency-selective networks, and voltage-controlled oscillators. By varying the input voltage applied to the diode, its capacitance can be adjusted in order to achieve the desired results.

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