RD39ES-AZ

Single Zener Diodes Overview

The RD39ES-AZ is a unidirectional silicon Zener diode manufactured by Renesas Electronics Corporation. It features a rated voltage of 3.875V and a power dissipation of 0.4W. The component utilizes a DO-34 glass package with two terminals. Key electrical specifications include a maximum dynamic impedance of 120 Ω and an operating temperature range extending up to 175 °C. The device is designed for single-element voltage regulation applications.

Single Zener Diodes Feature Summary

• Unidirectional voltage regulation capability
• Silicon-based construction in a glass encapsulated DO-34 package
• High thermal stability supporting operation up to 175 °C

Single Zener Diodes Applications

• Voltage regulation circuits
• Surge protection
• Reference voltage generation

Single Zener Diodes Procurement Notes

Verify RoHS compliance status carefully, as source data indicates conflicting information regarding lead-free certification for this specific part number. Confirm the exact suffix designation (e.g., AZ vs AB1) matches the required environmental standards for your assembly process. Ensure the supplier provides valid traceability documentation for the silicon material composition and package origin.

Single Zener Diodes Selection Notes

Select this component when a low-power, high-reliability Zener reference is required in a standard axial glass package. The 0.4W rating suits moderate current applications. Consider the 120 Ω dynamic impedance for noise sensitivity requirements. Verify that the DO-34 footprint aligns with existing PCB layouts before finalizing the design choice.

Single Zener Diodes Part Context

This part belongs to Renesas' discrete semiconductor diode portfolio, specifically within the Zener diode category. It serves as a fundamental passive component for analog signal conditioning and power management stages. The DO-34 package represents a traditional form factor often used in legacy or space-constrained through-hole designs requiring robust glass isolation.

Single Zener Diodes Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-reference with generic DO-34 Zener diodes only if electrical parameters match exactly. Verify pinout compatibility and thermal characteristics before attempting any substitution.