1N4490US

Single Zener Diodes Overview

The Microchip Technology 1N4490US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 110 V and a maximum power dissipation of 1.5 W at 25°C ambient temperature. It features a standard 5% voltage tolerance and operates within a junction and storage temperature range of -65°C to +175°C. The device utilizes a hermetically sealed voidless glass package with tungsten slugs, designated as the D-5A MELF form factor.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
• Qualified per MIL-PRF-19500/406 for military applications including JAN, JANTX, JANTXV, and JANS levels
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability circuits where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for your application, as the base part number covers multiple military grades. Confirm RoHS compliance status if environmental regulations apply, noting that compliant versions are available only in commercial grade. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component when a 110 V Zener reference is needed in a surface mount format. The 1.5 W power rating supports moderate current loads up to approximately 13 mA continuous operation. Consider the thermal resistance characteristics and derating curves for high-temperature environments exceeding 25°C ambient conditions.

Single Zener Diodes Part Context

This device belongs to the 1N4460US through 1N4496US series of industry-recognized Zener diodes. It serves as the surface mount equivalent to popular JEDEC registered axial-lead series, providing a compact alternative for modern PCB layouts while maintaining the robustness and electrical specifications of traditional through-hole components.

Single Zener Diodes Replacement Considerations

Direct replacements include other manufacturers' 1N4490 equivalents in DO-41 axial packages or compatible MELF formats. Verify that substitute parts meet the same MIL-PRF-19500/406 qualification requirements if military-grade reliability is mandatory.