Variable Capacitance Diode, Varactor, Varicap
Product Announcement from American Microsemiconductor, Inc.
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
- 1N3182, 1N3488, 1N4388, 1N4815, 1N5139, 1N5140A, 1N5148A, 1N5441A, 1N5454B, 1N5456A 1N5689B, 1N5694, 1N955B,
- BB104, BB505B, BB515, BB809, BB811, BBY42, C1470, HVP100, KV38S2, KV3902,
- MA4060D, MA424, MA4326D, MA4394, MA450A, MMBV105GLT1, MMBV3102LT1, MPSV56, MV104, MV1632, MV1634, MV1638, MV1642, MV1652, MV209, MV2101, MV2102, SC120, SC50B.
Specifications of Varactor Diode
Major varactor diode considerations are:
- Capacitance value
- Reverse voltage
- Variation in capacitance with voltage
- Maximum reverse working voltage
- Leakage current
- 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.
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