ZMV829ATA

Overview

The ZMV829ATA is a silicon hyperabrupt varactor diode from the 830 series, designed for frequency control and filtering applications. It features closely controlled capacitance-voltage (CV) characteristics and high Q factors. The nominal capacitance is 8.2 pF with a tolerance range of 7.38 pF to 9.02 pF at 2V reverse bias. The device exhibits a minimum Q of 250 at 3V and 50MHz, with a capacitance ratio (C2/C20) between 4.3 and 5.8. It operates within a temperature range of -55°C to +150°C and is housed in an SOT-23 surface mount package.

Feature Summary

• Low reverse current leakage ensures excellent phase noise performance
• High tuning ratio provided by hyperabrupt junction design
• Available in miniature surface mount packages for compact designs

Applications

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

Procurement Notes

Verify the specific ordering suffix TA indicates 7-inch reel packaging. Confirm RoHS compliance status as the datasheet notes general compliance but individual part verification is recommended. Ensure the component source is from authorized distributors to maintain quality standards and warranty coverage.

Selection Notes

Select this component when a nominal 8.2 pF capacitance is required for VCO tuning circuits. The 829A variant offers a capacitance ratio suitable for moderate tuning ranges. Consider the 829B variant if tighter capacitance tolerances are needed. Evaluate thermal dissipation limits based on the SOT-23 package constraints.

Part Context

This part belongs to the Zetex 830 series of silicon hyperabrupt varactor diodes. The series includes variants with different nominal capacitances ranging from 8.2 pF to 100 pF. These components are engineered for low phase noise and high Q performance in RF tuning applications.

Replacement Considerations

Direct substitutes include other parts from the same 830 series such as ZMV829BTA for tighter tolerance requirements. Cross-reference with other manufacturers' hyperabrupt varactors offering similar 8.2 pF nominal values and SOT-23 packaging.