ZC835BTA

Overview

The ZC835BTA is a silicon hyperabrupt varactor diode from the 830 series, 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 25V and offers a nominal capacitance of 68pF at 2V reverse bias. Key electrical parameters include a minimum Q of 100 at 3V and 50MHz, and a capacitance ratio (C2/C20) ranging from 5.0 to 6.5 at 1MHz. Packaged in SOT-23 surface mount format, it supports an operating temperature range of -55°C to +150°C.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios for efficient frequency modulation
• Low reverse leakage current typically around 200pA to minimize phase noise
• High quality factor ensuring stable operation in precision oscillator circuits
• Miniature surface mount packaging options for compact board layouts

Applications

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

Procurement Notes

Verify component authenticity through authorized channels as counterfeit semiconductor devices pose significant reliability risks. Confirm package marking codes match official datasheet specifications before integration. Ensure storage conditions adhere to moisture sensitivity level requirements to prevent soldering defects during assembly processes.

Selection Notes

Select this component when steep capacitance-voltage slopes are required for wide tuning ranges. Compare against the 12V hyperabrupt range if lower voltage operation is necessary. Verify that the SOT-23 footprint aligns with existing PCB layout constraints and thermal management requirements for the target application environment.

Part Context

This part belongs to the 830 series of silicon varactor diodes originally manufactured by Zetex Semiconductors plc. The series includes variants like ZC829, ZDC833, and ZMV829, offering different capacitance values while maintaining similar package styles. These components are engineered specifically for RF tuning applications requiring precise capacitance control under varying reverse bias voltages.

Replacement Considerations

Direct substitutes within the same series include ZC835ATA for 7-inch reel packaging or ZC835BTR for alternative tape configurations. Cross-reference electrical parameters such as capacitance tolerance and Q-factor when evaluating generic replacements to ensure circuit stability is maintained.