1N6818

Overview

The Microchip Technology 1N6818 is a silicon avalanche Zener diode designed for voltage reference and regulation applications. It features a nominal Zener voltage of 39V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 500mW at an ambient temperature of 25°C, utilizing a DO-35 axial leaded package. It operates within a junction temperature range of -65°C to +175°C and maintains a specified leakage current of no more than 1µA at the reverse voltage. The component utilizes gold wire bonds and is constructed using hermetic glass passivation to ensure reliability in harsh environments.

Feature Summary

• Hermetically sealed glass passivation construction
• Gold wire bond interconnects
• High thermal stability over extended temperature ranges
• Compliant with MIL-PRF-19500 qualification standards

Applications

• Military aerospace voltage regulation circuits
• Aviation electronic control systems
• High-reliability industrial instrumentation references

Procurement Notes

Verify that the specific part number suffix matches the required electrical tolerance and package variant. Confirm compliance with relevant military specifications such as MIL-PRF-19500 if the application demands qualified reliability. Ensure proper handling procedures are followed due to the axial leaded form factor during assembly.

Selection Notes

Select this component when a stable 39V reference is required in high-reliability environments. Consider the 500mW power rating and DO-35 package constraints regarding thermal management. Evaluate the ±5% tolerance against circuit requirements before finalizing the design.

Part Context

This component belongs to the family of hermetically sealed discrete semiconductors manufactured by Microchip Technology. These devices are engineered for critical applications where standard commercial parts may fail due to environmental stress or require long-term supply stability.

Replacement Considerations

Cross-reference with other MIL-PRF-19500 qualified Zener diodes offering identical 39V nominal voltage and DO-35 packaging. Verify pinout compatibility and thermal characteristics before substitution.