ZMV831BTC

Variable Capacitance (Varicaps, Varactors) Overview

The ZMV831BTC is a silicon hyperabrupt varactor diode from the 830 series, originally manufactured by Zetex Semiconductors and now part of Diodes Incorporated. It is designed for frequency control and filtering applications requiring closely controlled CV characteristics and high Q factors. The device features low reverse current to ensure excellent phase noise performance. It is available in miniature surface mount packages, including SOT-23, SOD-323, SOD-523, and SOT-323. Electrical specifications at 25°C include a nominal capacitance of 15.0 pF at 2V/1MHz, a minimum Q of 300 at 3V/50MHz, and a capacitance ratio (C2/C20) between 4.5 and 6.0.

Variable Capacitance (Varicaps, Varactors) Feature Summary

• Hyperabrupt junction design providing steep capacitance-voltage slopes for efficient tuning
• Low reverse leakage current typically around 200pA to minimize phase noise
• High quality factor (Q) ensuring stable oscillation performance
• Tight tolerance on capacitance values for precise frequency control

Variable Capacitance (Varicaps, Varactors) Applications

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

Variable Capacitance (Varicaps, Varactors) Procurement Notes

Verify the manufacturer origin carefully as Zetex was acquired by Diodes Incorporated. Confirm the specific package type (SOT-23, SOD-323, etc.) required for your PCB footprint, as the base model number covers multiple packages. Check if the component is listed as obsolete or last-time-buy status, as production may have ceased. Ensure RoHS compliance documentation is available if required for your assembly process.

Variable Capacitance (Varicaps, Varactors) Selection Notes

Select this component when a hyperabrupt profile is needed for wide tuning ranges in oscillator circuits. Compare the nominal capacitance of 15.0 pF against circuit requirements. Ensure the operating voltage range stays within the 25V peak reverse limit. Consider the thermal dissipation limits (e.g., 250 mW for SOD-523) if significant power is expected. Verify that the high-Q characteristic meets the phase noise specifications of the target application.

Variable Capacitance (Varicaps, Varactors) Part Context

This part belongs to the 830 series of silicon hyperabrupt varactor diodes. The series includes variants like ZC829, ZMV829, ZMDC830, and ZV831, offering different capacitance values and package options. The 'ZMV' prefix typically denotes a single diode in a specific surface-mount package, while 'BTA' indicates the specific binning and reel configuration. The series is designed for compact RF designs requiring reliable frequency stability.

Variable Capacitance (Varicaps, Varactors) Replacement Considerations

Direct substitutes within the same family include ZMV831ATA or ZMV831BTA, differing primarily in reel size or binning. Other series members like ZMV830 or ZMV832 offer different capacitance values but share similar electrical profiles. Cross-manufacturer equivalents should be evaluated based on matching CV curves, Q factors, and reverse leakage specifications.