ZC831ATA

Overview

The ZC831ATA is a single silicon hyperabrupt varactor diode from the 830 series, manufactured by Diodes Incorporated (originally Zetex). It operates in a peak reverse voltage of 25V and is housed in an SOT-23-3 surface-mount package. Key electrical parameters include a nominal capacitance of 15.0pF at 2V reverse bias and 1MHz frequency, with a minimum Q factor of 300 at 3V and 50MHz. The device exhibits a capacitance ratio (C2/C20) between 4.5 and 6.0 at 1MHz. It supports an operating temperature range of -55°C to +150°C.

Feature Summary

• Hyperabrupt CV characteristics designed for high tuning ratios
• Low reverse leakage current typically around 200pA
• High Q factor ensuring excellent phase noise performance

Applications

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

Procurement Notes

Verify component authenticity through authorized channels due to potential counterfeits. Confirm RoHS compliance status as historical data indicates non-compliance. Check for obsolete status or last-time-buy notifications before finalizing procurement plans. Ensure storage conditions adhere to moisture sensitivity level requirements.

Selection Notes

Select this component when steep capacitance-voltage slopes are required for frequency control applications. Compare against the 12V hyperabrupt range if lower voltage operation is necessary. Verify package compatibility with existing PCB footprints, specifically SOT-23 dimensions. Ensure thermal dissipation limits are respected within the target operating environment.

Part Context

This part belongs to the 830 series of silicon hyperabrupt varactor diodes originally produced by Zetex Semiconductors plc. The series includes various capacitance values and configurations, such as dual common cathode formats like the ZMDC831BTA. The ZC831ATA represents the single-diode variant optimized for specific tuning applications.

Replacement Considerations

Direct substitutes may include other parts from the 830 series with similar capacitance ranges, such as the ZC830ATA or ZC832ATA, provided pinout and package constraints match. Verify that alternative components meet the same Q factor and reverse breakdown voltage specifications.