SMV1247-079LF Discrete Semiconductor Products

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Variable capacitance diodes, or Varicaps, are a type of diode that have a reverse-biased junction that can be used to create a variable electrical capacitance. Device models of this type use a parallel-plate capacitor structure within the diode. Voltage is applied to the terminals of this capacitor, which results in a change of the capacitance that is dependent on the voltage. As a result, they are often used in oscillator circuits and frequency tuning applications, where precise capacitance values are required.

The SMV1247-079LF is a variable capacitance diode commonly used for frequency tuning applications in RF communications and automotive radio systems. It is part of the NXP Semiconductor’s SMV1247 family of silicon diodes, which is a series of high-speed, low-profile, low voltage diodes. This series of devices are designed to provide better performance than many similar diodes in the same general frequency range.

The SMV1247-079LFhas a reverse voltage rating of 20V, with a peak pulse current of 10mA and a capacitance range of 0.2 – 3.0 pF. The device features low parasitic capacitance, low series resistance, and fast switching speeds. As a result, this device is ideal for use in applications where a wide range of performance is required.

In order to understand the working principle of the SMV1247-079LF, it is important to first understand the basic structure of a variable capacitance diode. As stated earlier, this type of diode uses a parallel-plate capacitor structure within the diode. This capacitor consists of two stainless steel plates that are etched with a varying degree of surface roughness. When a negative voltage is applied to the terminals of this capacitor, the surface roughness of the plates creates a positive charge on the device. This positive charge then creates a strong electric field between the two plates, allowing for a change in capacitance that is dependent on the voltage applied.

The SMV1247-079LF can be used in a wide range of RF communications and automotive radio systems. It is often used in amplitude modulated (AM) radios, which require frequency agility and accuracy. It can also be used in cell phones and other wireless communications devices, as well as in automotive applications such as engine control units and anti-lock braking systems. Additionally, it can be used in frequency synthesizers, digital IF filters, frequency-hopping spread-spectrum devices, and low-noise amplifiers. This wide range of applications illustrates the extremely versatile nature of the SMV1247-079LF and its ability to provide high-speed, accurate performance in a wide range of settings.

To summarize, the SMV1247-079LF is a type of variable capacitance diode that can be used for frequency tuning applications in RF communications and automotive radio systems. It has a reverse voltage rating of 20V, a peak pulse current of 10mA and a capacitance range of 0.2 to 3.0pF. This device has a low parasitic capacitance and low series resistance, enabling it to provide reliable and accurate results in a wide range of applications. Additionally, due to its small size and high speed, this device is suitable for use in portable electronics, handheld devices and other space-constrained applications.

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