ZMV835ATA

Overview

The ZMV835ATA is a silicon hyperabrupt varactor diode from the 830 series, designed for frequency control and filtering applications. It features closely controlled capacitance-voltage characteristics and high Q factors to ensure excellent phase noise performance. The device operates in a single common cathode format within an SOT-23 surface-mount package. Key electrical parameters include a nominal capacitance of 68.0 pF at 2V reverse bias (1MHz), a minimum Q of 100 at 3V (50MHz), and a capacitance ratio of 5.0 to 6.5. It exhibits low reverse leakage current, typically 20 nA at 20V, supporting stable tuning operations.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios for precise frequency control
• Low reverse leakage current ensures minimal phase noise in oscillator circuits
• High Q factor maintains signal integrity across operating frequencies
• Miniature surface mount packaging facilitates automated assembly

Applications

• Voltage Controlled Crystal Oscillators (VCXO)
• Temperature Compensated Crystal Oscillators (TCXO)
• Wireless communications systems
• Mobile radio equipment

Procurement Notes

Verify component authenticity by checking manufacturer markings against official order code tables. Confirm package type matches the specified SOT-23 footprint. Ensure storage conditions prevent electrostatic discharge damage prior to installation. Review datasheet revisions for any updates to absolute maximum ratings or thermal characteristics before finalizing supply chain agreements.

Selection Notes

Select this variant when a nominal capacitance near 68pF is required for hyperabrupt tuning applications. Compare the 835A/B tolerance grades against circuit sensitivity requirements. Consider the SOT-23 package constraints regarding power dissipation limits of 330mW. Evaluate alternative series members if different capacitance ranges or voltage coefficients are needed for specific oscillator designs.

Part Context

This component belongs to the Zetex 830 series of silicon hyperabrupt varactor diodes. The series includes various capacitance values ranging from approximately 7pF to 110pF. These devices were originally manufactured by Zetex Semiconductors plc, which was later acquired by Diodes Incorporated. The product line focuses on miniature surface mount solutions for RF and microwave tuning applications.

Replacement Considerations

Direct substitutes within the same family include the ZC835ATA (single) or ZMDC835BTA (dual common cathode). Verify pinout compatibility and exact capacitance tolerances when cross-referencing with other manufacturers' hyperabrupt varactors. Ensure replacement parts meet the same RoHS compliance standards.