SMV1430-079LF Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	0.7pF @ 4V, 50MHz
Capacitance Ratio:	3.8
Capacitance Ratio Condition:	C0/C30
Voltage - Peak Reverse (Max):	30V
Diode Type:	Single
Q @ Vr, F:	1680 @ 4V, 50MHz
Operating Temperature:	-55°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SC-79, SOD-523
Supplier Device Package:	SC-79

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Variable Capacitance (Varicaps, Varactors)

Varicaps, also known as variable capacitance or varactors, are two-terminal semiconductor devices that exhibit variable capacitance when a voltage across them is changed. They are widely used as frequency-determining components in electronic circuits for such circuits as oscillators, band-pass filters, frequency multipliers and related devices.SMV1430-079LF is an example of a varicap diode. It is designed specifically to facilitate frequency or phase control in applications such as FM demodulator circuits and AM, FM, and TV tuner circuits.

Application Field

Varicap diodes are mainly used to control frequency or phase in various radio devices. One of their most common applications is in FM demodulators. FM demodulators convert the frequency variations in an FM signal into an audio signal. A voltage-controlled varicap diode is used to provide automatic frequency control (AFC) in the FM demodulator, allowing it to track the frequency and amplitude of the incoming FM signal.Varicaps are also often used in television tuners as a means of continuously tuning the signal. In this case, the varicap enables the signal to be tuned to any channel in the frequency range.Another common application for varicaps is in voltage controlled oscillators, where a varicap acts as a variable capacitance, allowing the output frequency of the oscillator to be varied using a control voltage.

Working Principle

The working principle of SMV1430-079LF is based on changing the capacitance of a device as a result of applying a voltage across it. Varicaps are two-terminal semiconductor devices that have a junction between an N-type and a P-type semiconductor material. When a DC voltage is applied across the device, the capacitance of the junction alters as a function of the voltage applied. The capacitance of the varicap is mainly determined by the area of the junction and the width of the depletion layer. By varying the applied voltage, the width of the depleted layer can be controlled which in turn changes the capacitance of the device.The varicap also has relatively low losses and does not dissipate any power. This means that it can be used to accurately control frequency or phase over a wide dynamic range.

Conclusion

The SMV1430-079LF Varicap diode is an excellent example of a varicap diode designed specifically to facilitate frequency or phase control. It is commonly used in applications such as FM demodulators, television tuners and voltage controlled oscillators. The device works by altering the capacitance of a junction between an N-type and a P-type semiconductors as a result of a varying DC voltage applied across it. It is low power-loss device meaning that it can be used to accurately control frequency or phase over a wide dynamic range.

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