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What is a Tuning / Varactor Diode?

A tuning diode, also known as a varactor diode, variable capacitance diode, varicap diode or variable reactance diode, is a diode that has a variable capacitance which is a function of the voltage that is impressed on its terminals. Tuning / varactor diodes are operated reverse-biased, and therefore no current flows. However, since the thickness of the depletion zone varies with the applied bias voltage, the capacitance of the diode can be made to vary. Usually, the capacitance is inversely proportional to the depletion region thickness and the depletion region thickness is proportional to the square root of the applied voltage. Therefore, the capacitance is inversely proportional to the square root of the voltage applied to the diode.

Types of Tuning / Varactor Diodes

There are several different kinds of tuning / varactor diodes. At Future Electronics we stock many of the most common types categorized by power dissipation, nominal diode capacitance, minimum diode capacitance ratio, minimum breakdown voltage, packaging type and diode cap tolerance. The parametric filters on our website can help refine your search results depending on the required specifications.

The most common sizes for nominal diode capacitance are 22 pF and 33 pF. We also carry tuning / varactor diodes with nominal diode capacitance up to 100 pF. Minimum breakdown voltage can be up to 30 V, with the most common size being 25 V.

Tuning / Varactor Diodes from Future Electronics

Future Electronics has a complete selection of tuning / varactor diodes from several manufacturers that can be used as a variable capacitance diode for any circuit requiring a varactor diode. Simply choose from the tuning / varactor diode technical attributes below and your search results will quickly be narrowed in order to match your specific tuning / varactor diode application needs.

If you have a preferred brand, we deal with ON Semiconductor and Zetex. You can easily refine your tuning / varactor diode product search results by clicking your preferred tuning / varactor diode brand below from our list of manufacturers.

Applications for Tuning / Varactor Diodes:

Tuning / varactor diodes are often used in RF design. They provide a way of varying the capacitance within a circuit by applying a control voltage. Due to this capability, tuning / varactor diodes are widely used in the RF industry. They can be found in voltage controlled oscillators such as in a phase locked loop and are used in almost all radio, cellular and wireless receivers. They can also be found in RF filters for tuning purposes (for example, as tuners of television sets to electronically tune the receiver to different stations), parametric amplifiers, parametric oscillators and frequency synthesizers.

Choosing the Right Tuning / Varactor Diode:

When you are looking for the right tuning / varactor diodes, you can filter the results by various attributes with the FutureElectronics.com parametric search: by Power Dissipation (225 mW, 300 mW, 330 mW), Minimum Breakdown Voltage (12 V, 14 V, 25 V, 30 V) and Nominal Diode Capacitance (2.8 pF, 22 pF, 33 pF, …) to name a few. You will be able to find the right tuning / varactor diode for any variable capacitance diode circuit.

Tuning / Varactor Diodes in Production Ready Packaging or R&D Quantities

If the quantity of tuning / varactor diodes required is less than a full reel, we offer to customers many of our tuning / varactor diode products in tube, tray or individual quantities that will help you avoid unneeded surplus.

In addition, Future Electronics offers its clients a unique bonded inventory program designed to eliminate potential problems that could arise from an unpredictable supply of products containing raw metals and products with long or erratic lead times. Talk with your nearest Future Electronics branch and find out more on how you and your company can avoid possible shortages.


Tuning / Varactor Diodes By:

Tuning / Varactor Diodes by Primary Attributes:

By Power Dissipation




By Breakdown Voltage-Min




By Diode Capacitance-Nom




By Peak Current-Max




By Diode Capacitance Ratio-Min




By Diode Cap Tolerance




Featured Tuning / Varactor Diode Products


Manufacturer Part Number Description
ON Semiconductor MMBV105GLT1G MMBV105 Series 225 mW 30 V 2.8 pF Silicon Tuning Diode - SOT-23-3
ON Semiconductor MMBV105GLT1G MMBV105GLT1G Series 225 mW 30 V 2.8 pF Silicon Tuning Diode - SOT-23-3
ON Semiconductor GA3216-E1 Digital Single or Dual Channel DSP Compression System
ON Semiconductor MMBV2109LT1G MV2109 Series 225 mW 30 V 33 pF Silicon Epicap Diode - SOT-23-3
ON Semiconductor MMBV3102LT1G MMBV3102LT1G Series 225 mW 30 V 22 pF Silicon Epicap Diode - SOT-23-3
ON Semiconductor MMBV432LT1G MMBV432LT1 Series 14 V 225 mW Surface Mount Silicon Tuning Diode - SOT-23-3
Zetex ZC831BTA ZC831 Series 330 mW 25 V 15 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC832BTA ZC832 Series 330 mW 25 V 22 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC833BTA ZC833 Series 330 mW 33 V 15 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC833BTA ZC833 Series 330 mW 25 V 33 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC834BTA ZC834 Series 330 mW 25 V 47 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC835BTA ZC835 Series 330 mW 68 V 15 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC835BTA ZC835 Series 330 mW 25 V 68 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC836BTA ZC836 Series 330 mW 25 V 100 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC836BTA ZC836 Series 330 mW 25 V 100 pF Silicon Hyperabrupt Varactor Diode - SOT-23
Zetex ZC934TA Diode VAR Cap Single 12V 95pF 3-Pin SOT-23 T/R
Zetex ZMV829BTA Silicon 25V Hyperabrupt Varactor Diode
Zetex ZMV832BTA ZMV832 Series 330 mW 25 V 22 pF Silicon Hyperabrupt Varactor Diode - SOD-323
Zetex ZMV833BTA ZMV833 Series 330 mW 25 V 33 pF Silicon Hyperabrupt Varactor Diode - SOD-323

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