ZMV933TA

Overview

The ZMV933TA is a silicon hyperabrupt varactor diode manufactured by Diodes Incorporated, designed for frequency control and filtering applications. It features closely controlled capacitance-voltage characteristics and high Q factors to ensure excellent phase noise performance. The device operates with a maximum reverse voltage of 12V and offers octave tuning from 0 to 6V. At a reverse voltage of 1V, the nominal capacitance is 42pF, which decreases to 18pF at 2.5V and 12pF at 4V. The minimum Q factor is specified as 150 at 4V and 50MHz. It is available in the SOD323 surface mount package.

Feature Summary

• Close tolerance C-V characteristics
• Octave tuning capability from 0 to 6V
• Low reverse current (typically 200pA)
• Excellent phase noise performance
• High Q factor

Applications

• VCXO and TCXO
• Wireless communications
• Pagers
• Mobile radio

Procurement Notes

Verify the manufacturer designation on the component marking against official datasheets, as the product line originates from Zetex Semiconductors and may be distributed under different branding. Confirm the specific package type matches the required footprint. Ensure that the ordering suffix corresponds to the correct reel size and tape width specifications provided in the documentation.

Selection Notes

Select this component based on the required capacitance range and Q factor at the operating frequency. Consider the power dissipation limits relative to the chosen package, such as 330mW for SOT23 or SOD323 and 250mW for SOD523. Evaluate the temperature coefficient of capacitance if operation over wide temperature ranges is necessary. Ensure the reverse breakdown voltage rating meets the circuit requirements.

Part Context

This part belongs to the ZC930, ZMV930, and ZV931 series of silicon 12V hyperabrupt varactor diodes. The series includes variants like ZC933TA and ZV933V2TA, offering different packaging options including SOT23, SOD323, and SOD523. These components are engineered for miniature surface mount applications requiring precise frequency control.

Replacement Considerations

Direct substitutes within the same series include ZC933TA and ZV933V2TA, which share identical electrical characteristics but differ in package style. Verify pinout compatibility and physical dimensions when switching between SOT23, SOD323, and SOD523 packages.