KV3902

Overview

The KV3902 is a hyperabrupt junction RF varactor diode from the Microsemi KV3201–KV3902 series, designed for UHF applications. It features computer-controlled grown junction epitaxy to ensure high Q and consistency within a 30 Volt rating. The device provides a capacitance range of 22.5 to 27.5 pF at 3V bias, enabling octave tuning of LC tanks through 500 MHz. Key electrical parameters include a typical quality factor of 30 at 50 MHz, a breakdown voltage (VBR) of 6.8 to 8.9 V, and a reverse leakage current of 115 to 160 nA at 80% of VBR. It utilizes a DO-34 hermetic glass package with gold terminations.

Feature Summary

• Hyperabrupt junction design optimized for wide bandwidth VCOs and frequency modulators
• Hermetic glass DO-34 package with tough MIL-Spec SiO2 passivation
• Low inductance construction supporting ultrahigh Q performance
• Wide capacity swing allowing flexible tuning ratios across bias voltages

Applications

• Wide bandwidth Voltage Controlled Oscillators (VCOs)
• Frequency modulators
• Voltage variable filters
• Analog phase shifters
• TCXOs and VCXOs

Procurement Notes

Verify component authenticity by checking for the green cathode stripe marking specified in the datasheet. Confirm the DO-34 hermetic package style and gold termination suitability for RoHS compliant assembly. Ensure handling procedures account for ESD sensitivity during installation and storage.

Selection Notes

Select the KV3902 when a higher baseline capacitance than the KV3201 is required for UHF circuits. The device supports straight-line-frequency tuning over a 3 to 8 volt range or octave tuning through 500 MHz. Consider the ±5% tolerance available in 'A' suffix versions if tighter capacitance matching is necessary for specific filter or oscillator designs.

Part Context

The KV3902 belongs to the KV3201–KV3902 family of low-cost UHF hyperabrupt varactors manufactured by Microsemi. This series shares common epitaxial growth processes and package styles, offering designers a consistent platform for RF tuning applications across the VHV/UHF spectrum with varying initial capacitance values.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation.