BB515E-7904 – SIEMENS

The BB515E-7904, manufactured by Siemens, is a variable capacitance diode (varicap) specifically designed for electronic tuning applications. Encapsulated in a standard SOD-323 package, this diode exhibits a capacitance range optimized for VHF and UHF frequency bands. The “Siemens/98” designation likely refers to the manufacturing date or a specific process refinement implemented in 1998. The device’s capacitance varies inversely with applied reverse voltage, offering a tuning ratio suitable for voltage-controlled oscillators (VCOs) and frequency synthesizers. Supplied on 3k reels, the BB515E-7904 is intended for automated assembly processes. Key electrical characteristics include a typical capacitance of approximately 1.4 pF at 2V reverse bias, a high Q-factor to minimize losses in tuned circuits, and a low reverse leakage current to maintain stable oscillator performance.