ZC829ATA

Overview

The ZC829ATA 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. The nominal capacitance is 8.2 pF with a tolerance range of 7.38 to 9.02 pF at 2V reverse bias. The device has a minimum breakdown voltage of 5V and low reverse leakage current. It is housed in an SOT-23 surface mount package.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios
• Low reverse current ensuring excellent phase noise performance
• High Q factor for efficient frequency control
• Tightly controlled capacitance-voltage characteristics

Applications

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

Procurement Notes

Verify the manufacturer origin as Zetex Semiconductors, which may be distributed under Diodes Incorporated branding. Confirm the specific suffix TA indicates 7-inch reel packaging. Ensure the component matches the J9A marking code for the 829A variant. Validate RoHS compliance status through official documentation before procurement.

Selection Notes

Select this component when steep capacitance-voltage slopes are required for wide tuning ranges. Compare against the 12V hyperabrupt range if higher breakdown voltages are needed. Consider the SOT-23 package constraints for power dissipation limits. Evaluate the 8.2 pF nominal capacitance against circuit requirements at 2V reverse bias.

Part Context

This part belongs to the 830 series of silicon varactor diodes manufactured by Zetex Semiconductors. The series includes various capacitance values ranging from 8.2 pF to 100 pF. The ZC829ATA specifically represents the single common cathode configuration in the SOT-23 package format within this product family.

Replacement Considerations

Direct substitutes include other parts from the 830 series such as ZMV829 or ZV829 variants depending on package preference. Cross-reference with the 12V hyperabrupt range like ZV930 if higher voltage operation is necessary. Verify pinout compatibility and capacitance tolerances before substitution.