RD39E

Single Zener Diodes Overview

The NEC RD39E is a planar type silicon zener diode housed in the DO-35 glass-sealed package. It utilizes DHD (Double Heatsink Diode) construction to achieve an allowable power dissipation of 500 mW at 25°C ambient temperature. The nominal zener voltage is 39 V, adhering to the E24 standard series with a 10-volt step increment for higher voltage models within the RD2.0E to RD200E range.

Single Zener Diodes Feature Summary

• DHD (Double Heatsink Diode) construction for enhanced thermal performance
• Glass-sealed DO-35 axial leaded package
• Planar type silicon zener diode structure

Single Zener Diodes Applications

• Constant voltage circuits
• Waveform clipper circuits
• Surge absorber applications

Single Zener Diodes Procurement Notes

Verify the specific suffix designation when ordering. Suffixes B1 through B7 are required for tight tolerance classifications on models ranging from RD2.0E to RD39E. Ensure the correct suffix is specified to meet precise voltage tolerance requirements rather than using the generic base part number alone.

Single Zener Diodes Selection Notes

Select this component for low-power voltage regulation tasks requiring a compact axial package. The 500 mW dissipation rating supports moderate current loads. Verify that the operating junction temperature remains within absolute maximum ratings during continuous operation to ensure reliability.

Single Zener Diodes Part Context

This device belongs to the NEC RD2.0E to RD200E series of planar zener diodes. The series covers a wide voltage range from 2 V to 120 V. The RD39E specifically represents the 39 V nominal value point within the E24 standard voltage classification used for this product line.

Single Zener Diodes Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.