SMV1800-079LF

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Diodes, also known as junction diodes, play a crucial role in the electronic industry. They are physically composed of semiconductor materials and can be heavily categorized based on their uses. ​One such type is the Variable Capacitance (Varicaps, Varactors), which are most common in tuning circuits, voltage-controlled oscillators, and frequency modulation circuits. Specifically, this article is focused on the SMV1800-079LF series of Varicap Diodes from the Japanese manufacturer NEC Corporation.

SMV1800-079LF is a middle frequency Varicap Diode and can be used in AM radio, FM radio, and even in VHF video applications. It is made of glass and is packaged in a Small Outline Integrated Circuit (SOIC) package. Varicaps are also known as tuning diodes as their capacitance can be controlled by changing the applied reverse bias voltage. The forward bias current of SMV1800-079LF can be pulsed and turned on and off. This property makes the diode applicable to a variety of non-linear applications.

The capacitance-voltage characteristic curve of the SMV1800-079LF is linear and predictable. The capacitance is determined by the reverse-biased voltage applied across the diode and can range from 0.73 to 19.4 pF as the voltage varies from 0 to -1.5V. This linear characteristic is essential in tuning applications like AM and FM radio receivers, where the strict control of frequency over various bands is required.

The resonant frequency of SMV1800-079LF is about 6GHz and the voltage-tunable capacitance makes it applicable for VHF video applications, which require a wide range of high-frequency signals. It can also be used in voltage-controlled oscillators as the capacitance-voltage characteristic allows for direct control of the frequency of the oscillator.

SMV1800-079LF has a very low leakage current and a high power-dissipation capability, making it an ideal choice for low-noise amplification of HF radio signals. It also is able to withstand large RF power levels up to 20W, making it suitable for many high-frequency power amplifiers. The linearity of tuning and good temperature stability of this Varicap Diode further makes it suitable for many precision applications.

In addition to its variable capacitance feature, the SMV1800-079LF also has a low series resistance, which can reduce power losses in tuned circuits from various sources. This Varicap diode exhibits excellent noise margins in high-frequency applications due to its low series resistance and fast switching times.

The SMV1800-079LF Varicap Diode is designed to provide a low-cost and reliable solution for a wide range of tuning and frequency-modulation applications. This Varicap Diode from NEC Corporation exhibits superior performance in noise margins, temperature stability, and linearity, thereby making it a preferred choice for many precision applications.

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