ZC834BTA

Overview

The ZC834BTA is a silicon hyperabrupt varactor diode from the 830 series, manufactured by Diodes Incorporated (formerly Zetex). 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. Key electrical parameters include a nominal capacitance of 47.0 pF at 2V reverse bias and 1MHz frequency, with a minimum Q of 200 at 3V and 50MHz. The capacitance ratio (C2/C20) is specified between 5.0 and 6.5. It utilizes an SOT-23 surface mount package.

Feature Summary

• Hyperabrupt junction design providing steep capacitance-voltage slopes for wide tuning ranges
• Low reverse leakage current typically around 20nA at 20V, ensuring low phase noise performance
• High quality factor (Q) maintained across operating frequencies
• Available in miniature surface mount packages including SOT-23

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 Zetex Semiconductors advises against unauthorized sales. Confirm RoHS compliance status and check for specific ordering suffixes such as TC for 13-inch reels versus TA for 7-inch reels. Ensure the latest datasheet version is referenced prior to finalizing procurement specifications.

Selection Notes

Select the ZC834BTA when a nominal capacitance near 47pF and a high tuning ratio are required. Compare the B-series tolerance against the A-series if tighter capacitance limits are necessary. Verify that the SOT-23 package dimensions align with the PCB footprint requirements and ensure the operating voltage does not exceed the 25V peak reverse voltage rating.

Part Context

This component belongs to the 830 series of silicon hyperabrupt varactor diodes originally published by Zetex Semiconductors plc. The series includes variants like ZC834ATA and ZC834BTA, distinguished primarily by their capacitance tolerances. The product line is designed for frequency control and filtering applications requiring stable performance over temperature variations.

Replacement Considerations

Public confirmed substitute part numbers: None identified.