2BZX84C3V9

Overview

The Diotec Semiconductor 2BZX84C3V9 is a surface-mount planar Zener diode array featuring two independent diodes with a common anode configuration. Housed in the SOT-23 (TO-236) package, it provides a nominal Zener voltage range of 3.7 V to 4.1 V at a test current of 5 mA. The device supports a maximum total power dissipation of 300 mW and operates within a junction temperature range of -50°C to +150°C. It exhibits a dynamic resistance of less than 90 Ohms and a reverse leakage current of 3 µA at 1 V.

Feature Summary

• Common Anode Configuration: Integrates two independent Zener diodes sharing a single anode terminal for efficient circuit layout.
• Sharp Breakdown Characteristics: Delivers precise voltage regulation with defined breakdown thresholds suitable for stable reference applications.
• Low Leakage Current: Maintains minimal reverse current under non-conducting conditions to reduce standby power consumption.

Applications

• Voltage stabilization circuits requiring dual references from a shared ground potential.
• Regulator input protection stages utilizing common cathode topology.
• Clamping networks for transient suppression in low-voltage signal lines.

Procurement Notes

Verify the specific suffix designation when ordering, as commercial (-C), industrial, AEC-Q101 compliant (-Q), and qualified (-AQ) grades exist within this family. Confirm that the common anode variant matches the schematic requirements, as standard single-diode versions are also available. Ensure the selected grade meets the environmental and reliability standards required for the target application environment.

Selection Notes

Select the 2BZX84C3V9 specifically when a dual-diode solution with a common anode is necessary to save board space or simplify routing. Compare the 300 mW power rating against the expected thermal load in the final assembly. Verify that the 3.7 V to 4.1 V voltage range aligns with the system's tolerance requirements, noting that other voltages in the BZX84 series offer different breakdown characteristics.

Part Context

This component belongs to the Diotec BZX84Cxx series of SMD planar Zener diodes. While many parts in this series are single-diode configurations, the 2BZX84C prefix denotes a dual-diode array structure. This specific model offers a compact alternative to discrete components, consolidating two regulation points into a single SOT-23 footprint to optimize PCB real estate.

Replacement Considerations

Direct replacements must maintain the common anode configuration and SOT-23 package. Single-diode equivalents like the BZX84C3V9 cannot be used without modifying the circuit design to accommodate separate anodes. Verify that any substitute part meets the same 300 mW power dissipation and voltage tolerance specifications.