ON Semiconductor Varactor Diodes are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for ON Semiconductor Varactor Diodes. Varactor or varicap diodes are used mainly in radio frequency or RF circuits to provide voltage controlled variable capacitance. This can be used in a whole variety of ways where a capacitance level needs to be controlled by a voltage. Feb 04, 2005 · Does any have datasheet of BB109 Varactor Diode? Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. And, as for capacitance, you need to look at the manufacturers sheet for your various diodes to see how much capacitance can be generated by what bias voltage range. The typical range for varactor tuning diodes is about 1 to about 50 pF maximum. It is generally easier to put several stacks (as in b) in parallel to develop higher capacitance. varicap-varactor-diodes. If you do not remember your password, enter the e-mail address you used to register, it will be sent a new password, you will be able to change it at your next log-in.