ZC830BTA

Overview

The ZC830BTA 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 device operates with low reverse current to ensure minimal phase noise. Key electrical parameters at 25°C include a nominal capacitance of 10.0 pF (range 9.5–10.5 pF) at 2V reverse bias, a minimum Q of 300 at 3V/50MHz, and a capacitance ratio (C2/C20) between 4.5 and 6.0. It has a maximum reverse breakdown voltage of 5V and leakage current of 20 nA at 20V. Power dissipation is 330 mW in SOT-23/SOD-323 packages.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios for efficient frequency modulation.
• Low reverse leakage current typically around 200pA to support ultra-low phase noise performance.
• High quality factor (Q) ensuring stable operation in resonant circuits.
• Available in miniature surface-mount packages including SOT-23, SOT-323, SOD-323, and SOD-523.

Applications

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

Procurement Notes

Verify the specific package variant required, as the 830 series spans multiple footprint types. Confirm that the 'TA' suffix denotes 7-inch reel packaging; substitute 'TC' for 13-inch reels if higher volume tape-and-reel quantities are needed. Ensure compatibility with RoHS directives and check for ESD handling precautions during assembly.

Selection Notes

Select the ZC830BTA when a nominal capacitance near 10pF and a capacitance ratio between 4.5 and 6.0 are required. Compare against the 829 series for lower capacitance or the 831 series for higher capacitance needs. Consider the operating temperature range of -55°C to +150°C for environmental robustness. Verify that the 25V rating aligns with the circuit's peak reverse voltage constraints.

Part Context

This component belongs to the Zetex 830 series of silicon hyperabrupt varactor diodes. The series includes variants like ZC829, ZMV829, and ZV831, offering different capacitance values while maintaining similar high-Q and low-leakage characteristics. The ZC830BTA specifically targets applications requiring moderate capacitance with tight tolerance control for precision frequency synthesis.

Replacement Considerations

Direct substitutes within the same family include ZC830ATA for single units or alternative reel sizes. For different capacitance values, consider ZC829BTA (lower C) or ZC831BTA (higher C). Cross-manufacturer equivalents may exist but require verification of CV curves and Q factors.

FAQ

What is the typical reverse leakage current for the ZC830BTA?

The typical reverse leakage current is 200 pA, which contributes to low phase noise performance.

How does the ordering suffix affect the product?

The 'TA' suffix indicates 7-inch tape and reel packaging. To order 13-inch reels, replace 'TA' with 'TC' in the order code.

What is the maximum power dissipation for this device?

The maximum power dissipation is 330 mW at 25°C ambient temperature for SOT-23 and SOD-323 packages.