Product Announcement from American Microsemiconductor, Inc.


Variable Capacitance Diode, Varactor, Varicap-Image

Servicing the Semiconductor industry since 1970 - American Microsemiconductor.

A varicap diode, varactor diode,or tuning diode is a type of diode whose PN junction capacitance can be varied by varying the voltage across that junction.

Varicap diodes (varactor or tuning diodes) are principally used as voltage variable capacitors, with their diode function a secondary option.

Click for full specification and ordering information for Varactor Diodes

Specifications of Varactor Diode

Major varactor diode considerations are:

  • Capacitance value
  • Reverse voltage
  • Variation in capacitance with voltage
  • Maximum reverse working voltage
  • Leakage current

Key applications

  • Electronic tuning including satellite and terrestrial TV tuners
  • DVD recorders
  • FM radio tuning from car radios to mobile phones
  • Voltage controlled oscillator (VCO)
  • Voltage controlled crystal oscillator / temperature controlled crystal oscillator (VCXO/TCXO)

When a reverse voltage is applied to a PN junction of varactor diode, the holes in the p-region are attracted to the anode terminal and electrons in n-region are attracted to the cathode terminal of varactor diode, creating a region where there is little charge of either type(the depletion region). This region, the depletion region, is essentially devoid of carriers and behaves as the dielectric of a capacitor. The P and N regions behave as the Capacitors Plates.

Did you Know ?

  •  American Microsemiconductor Inc. (AMS) is Certified AS9100: Rev C and ISO9001:2008
  • AMS has been supplying semiconductor for over 45 years
  • AMS has the largest semiconductor stock; over 170,000 different line items in stock
  • AMS has over 100 years of semiconductor sales experience
  • AMS sells semiconductors worldwide
  • AMS designs, re-engineers, modifies, manufactures, and tests all types of semiconductors 
  • We offer equivalents and replacements for discontinued/obsolete Semiconductors
  • If you have a sample of what you need, we will evaluate your sample
  • We have a Yahoo Semiconductor ecommerce store. Please visit us at: http://store.americanmicrosemiconductor.com
  •  AMS also  has our large inventory online at www.Amazon.com
  •  Both our stores, Yahoo and Amazon, have no minimum Purchase Order
  •  AMS accepts and delivers small manufacturing orders efficiently and on time.
  •  AMS supplies test data, if needed, on all our parts
  •  We do sorting, selection, and matching of semiconductor parameters
  •  Have a requirement, call us at 973-377-9566, Fax us at 973-377-3078,              email at sales@americanmicrosemi.com, or visit one of our stores at: http://store.americanmicrosemiconductor.com, or www.Amazon.com

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