Varactor Diodes

Varactor Diode are a semiconductor diode that is is utilised in RF tuning to circuits voltage-controlled variable capacitance. This type of diode can be used in a multitude of areas where a capacitance level needs to be controlled by a voltage.

How does a varactor diode work?

In order to achieve a specific variance in capacitance, this type of diode works with the different region types of a capacitor known as P-type and N-type. These types can be manipulated to give out higher depletion sizes or narrowed and decreased in size, this will give you the variable capacitance you wish out of the device.

Varactor diodes can also provide analogue control of voltage and can also alongside digitally generated voltage in microprocessors. an ADC can then be utilised to convert from analogue voltage to control the diode.

Where are varactor diodes used?

Varactor diodes have a range of application use such as;

  • Satellites
  • TV tuning
  • DVD devices
  • RF Tuning
  • Frequency synthesizers

...
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Description Price Diode Configuration Application Number of Elements per Chip Minimum Diode Capacitance Maximum Reverse Voltage Minimum Quality Factor Minimum Tuning Ratio Mounting Type Package Type Pin Count Tuning Ratio Test Condition Dimensions Height Length
RS Stock No. 791-9591
Mfr. Part No.SVC704-TL-E
MYR1.995
Each (On a Tape of 20)
units
Single VCO 1 3.4pF 16V - 6 Surface Mount MCPH 3 1 → 7V 2 x 1.6 x 0.85mm 0.85mm 2mm
RS Stock No. 124-5433
Mfr. Part No.SVC704-TL-E
MYR0.783
Each (On a Reel of 3000)
units
Single VCO 1 3.4pF 16V - 6 Surface Mount MCPH 3 1 → 7V 2 x 1.6 x 0.85mm 0.85mm 2mm
RS Stock No. 162-9645
Mfr. Part No.SVC230-TB-E
MYR0.711
Each (On a Reel of 3000)
units
Common Cathode Tuner 2 25.1pF 16V 100 1.65 Surface Mount SOT-23 3 2 → 8V 2.9 x 1.5 x 1.1mm 1.1mm 2.9mm
RS Stock No. 162-9647
Mfr. Part No.SVC236-TB-E
MYR0.927
Each (On a Reel of 3000)
units
Common Cathode Tuner 2 14.44pF 16V 70 5 Surface Mount SOT-23 3 1 → 6.5V 2.9 x 1.5 x 1.1mm 1.1mm 2.9mm
RS Stock No. 791-9576
Mfr. Part No.SVC236-TB-E
MYR2.07
Each (In a Pack of 15)
units
Common Cathode Tuner 2 14.44pF 16V 70 5 Surface Mount SOT-23 3 1 to 6.5V 2.9 x 1.5 x 1.1mm 1.1mm 2.9mm
RS Stock No. 791-9572
Mfr. Part No.SVC230-TB-E
MYR1.58
Each (In a Pack of 20)
units
Common Cathode Tuner 2 25.1pF 16V 100 1.65 Surface Mount SOT-23 3 2 to 8V 2.9 x 1.5 x 1.1mm 1.1mm 2.9mm