Varactor is a semiconductor device utilizes a variable capacitance between PN junction made of the principle, DB3 diodes for use in high frequency tuning variable capacitor and communications circuits. Varactor have a variety of packages of glass shell package (glass seal), plastic packaging (plastic), metal packaging (gold seal) and leadless surface mount, etc., shown in Figure 4-18. In general, small and medium power varactors use glass sealed, plastic or surface-mount, while larger power varactor use of gold seal. Common parameters varactor varactor diodes varicap also known, based on changes in the voltage provided to the semiconductor junction capacitance changes. That is, as a variable capacitor, can be applied to the FM tuner and TV tuner resonant circuit and the FM modulation circuit. Varactor (Varactor Diodes), also known as 'varactor diode'. It is a use of PN junction capacitance (varactor barrier capacitance) and its inverse dependence of the main parameters of the diode and the principle of the bias voltage Vr is made: bias junction capacitance, zero bias merit, reverse breakdown voltage, reverse bias center, nominal capacitance, capacitance range (in units of picofarads) and cut-off frequency. Varactor is a semiconductor device utilizes a variable capacitance between PN junction made of the principle, 1N4749A diodes for use in high frequency tuning variable capacitor and communications circuits. Varactor have a variety of packages of glass shell package (glass seal), plastic packaging (plastic), metal packaging (gold seal) and leadless surface mount, etc., shown in Figure 4-18. Typically, diodes, varactors medium power sealed using glass, plastic or surface mount, glass diodes, and power is larger varactor use of gold seal. Common parameters varactor varactor diodes varicap also known, based on changes in the voltage provided to the semiconductor junction capacitance changes. That is, as a variable capacitor, can be applied to the FM tuner and TV tuner resonant circuit and the FM modulation circuit. _ The integrity _1N4749A diode diode provided by Qingdao integrity Technology Co., Ltd. _ The integrity _1N4749A diode diode is Qingdao integrity Technology Co., Ltd. (www.qdjcx.com) this year introduced a new upgrade, the above picture is for reference only, please call Tel picture on this page or to obtain the latest information Contact: Mr. Yang.