1N4990US

Single Zener Diodes Overview

The Microchip Technology 1N4990US is a surface-mount Zener voltage regulator diode designed for high-reliability applications. It features a nominal Zener voltage of 220 V with a tight tolerance of 5%. The device is rated for a maximum power dissipation of 5 W and operates within an extended temperature range from -65°C to +175°C. Packaged in the D-5B-2 (E-MELF) form factor, it utilizes voidless hermetically sealed glass construction to ensure durability in harsh environments.

Single Zener Diodes Feature Summary

• Hermetically sealed glass construction for environmental protection
• Extended operating temperature range suitable for extreme conditions
• High power dissipation capability for robust voltage regulation

Single Zener Diodes Applications

• Military aerospace systems requiring radiation hardness
• Avionics voltage regulation circuits
• Space-grade electronic instrumentation

Single Zener Diodes Procurement Notes

Verify the specific suffix US against official datasheets to confirm package type and qualification level. Ensure compatibility with existing PCB footprints for the D-5B-2 package. Confirm that the 5% voltage tolerance meets circuit requirements. Check for updated manufacturing notices or lifecycle status directly from Microchip before finalizing procurement plans.

Single Zener Diodes Selection Notes

Select this component when high-voltage regulation is required in space-constrained surface-mount designs. The 5 W rating allows for significant current handling compared to standard small-signal diodes. Consider the extended temperature range if the application involves thermal cycling or high ambient heat. Verify that the hermetic seal requirement aligns with the system's environmental protection standards.

Single Zener Diodes Part Context

This part belongs to the 1N49xx series of surface-mount Zener diodes manufactured by Microchip Technology. These components are typically military qualified and designed for use in demanding environments where reliability is critical. The series offers various voltage ratings while maintaining consistent physical dimensions and performance characteristics across different models.

Single Zener Diodes Replacement Considerations

Direct substitutes include JAN1N4990DUS and JANTXV1N4990US/TR, which share similar electrical specifications and package types. Verify pinout compatibility and ensure that any replacement maintains the required hermetic sealing and radiation hardness levels for the intended application.