ZMV829ATC

Overview

The ZMV829ATC is a silicon hyperabrupt varactor diode from the 830 series, manufactured by Zetex Semiconductors. It features closely controlled capacitance-voltage (CV) characteristics and high Q factors for frequency control applications. The device operates within a temperature range of -55°C to +150°C. Key electrical parameters include a nominal capacitance of 8.2 pF at 2V reverse bias, a minimum Q factor of 250 at 3V/50MHz, and a capacitance ratio (C2/C20) between 4.3 and 5.8. The maximum reverse breakdown voltage is 5V with leakage current typically below 20nA at 20V.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios and steep CV slopes
• Low reverse leakage current ensuring excellent phase noise performance
• High Q factor suitable for precision frequency control circuits
• Miniature surface mount packaging options including SOT-23

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 plc, which may be associated with Diodes Incorporated through acquisition history. Confirm the specific suffix 'TC' indicates 13-inch tape and reel packaging containing 10,000 units per reel, distinct from the 'TA' suffix for 7-inch reels. Ensure compliance with RoHS directives and check for any product change notices regarding the 830 series specifications.

Selection Notes

Select this component when a 25V rated hyperabrupt varactor with an 8.2 pF nominal capacitance is required. Compare the C2/C20 ratio against circuit requirements for tuning linearity. Consider the SOT-23 package dimensions for board space constraints. Evaluate thermal dissipation limits if operating near the upper temperature boundary of 150°C.

Part Context

This part belongs to the Zetex 830 series of silicon varactor diodes, designed for frequency control and filtering. The series includes variants with different capacitance values such as ZMV830, ZMV831, and ZMV832. The ZMV829 specifically targets applications requiring lower nominal capacitance compared to higher value counterparts in the same family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's sales network for authorized replacements or equivalent hyperabrupt varactors with matching CV characteristics and package compatibility.