Three miniature 0402 varactor diodes target voltage-controlled-oscillator (VCO), phase-shifter, and voltage-tuned-filter applications that require a high-quality-factor (high-Q) and low-resistance varactor with a large capacitance change from 0 to 5 V. The SMV1247-040LF and SMV1249-040LF are silicon, surface-mount, and hyperabrupt tuning varactor diodes with a typical capacitance ratio of 10 from 0.3 to 4.7 V for the SMV1247-040LF and 12 for the SMV1249-040LF. They are suitable for octave-bandwidth VCOs, wide-voltage-range phase shifters, and wideband voltage-controlled filters. These varactor diodes are provided in a surface-mount package that is compatible with the industry-standard 0402 printed-circuit-board (PCB) footprint. Their sibling, the SMV1763-079LF, is a silicon hyperabrupt-junction varactor diode specifically designed for 3-V platforms. The specified high-capacitance ratio and low reverse voltage make this varactor appropriate for the low-phase-noise VCOs used in wireless systems to and above 2.5 GHz. These small form-factor, discrete, low-profile plastic diodes are contained within SMT packaging. Samples are available.

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