ZMV833ATA

Overview

The ZMV833ATA is a silicon hyperabrupt varactor diode from the 830 series, manufactured by Zetex Semiconductors. It features closely controlled capacitance-voltage characteristics and high Q factors for frequency control applications. The device operates within a temperature range of -55°C to +150°C. At VR=2V and f=1MHz, the nominal capacitance is 33.0 pF with a minimum Q of 200 at VR=3V and f=50MHz. The capacitance ratio (C2/C20) at 1MHz ranges from 5.0 to 6.5. Reverse leakage current is typically 20 nA at 20V, with a breakdown voltage of 5V at 10µA.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios for efficient frequency modulation.
• Low reverse leakage current ensures excellent phase noise performance in oscillator circuits.
• Tight capacitance tolerance allows for precise frequency control without external trimming.

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 was acquired by Diodes Incorporated. Confirm the specific package type matches the design requirements, as the 830 series is available in SOT-23, SOT-323, SOD-523, and SOD-323 packages. Check for RoHS compliance status relative to the production date and ensure the ordering suffix corresponds to the desired reel size (7-inch or 13-inch).

Selection Notes

Select this component when a high capacitance ratio and low phase noise are required for VCO tuning. Compare the nominal capacitance of 33pF against circuit requirements. Ensure the operating voltage does not exceed the 5V breakdown rating. Consider alternative package sizes if board space constraints differ from the standard surface mount options provided in the datasheet.

Part Context

This part belongs to the 830 series of silicon hyperabrupt varactor diodes originally published by Zetex Semiconductors. The series includes variants like ZC829 through ZC836, offering different capacitance values ranging from approximately 8pF to 100pF. These devices are designed for miniature surface mount applications requiring stable electrical performance across wide temperature ranges.

Replacement Considerations

Direct substitutes include other parts from the same 830 series such as ZMV832ATA or ZMV834ATA, depending on whether lower or higher capacitance is acceptable. Cross-reference with Diodes Incorporated's current portfolio for equivalent hyperabrupt varactors if Zetex branding is no longer supported.