1N4490US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4490US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 110 V. It operates within a junction temperature range of -65 °C to +175 °C and dissipates up to 1.5 W at 25 °C ambient. The device features a test current of 2.3 mA, a maximum dynamic impedance of 300 Ohms, and a reverse leakage current of 25 µA at 88 V. It utilizes an A (D-5A) MELF package.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction using internal metallurgical bonds for robustness.
• Military qualification available per MIL-PRF-19500/406 standards.
• Inherently radiation hard design suitable for high-reliability environments.

Single Zener Diodes Applications

• High-reliability applications where failure cannot be tolerated.
• Voltage regulation over broad operating current and temperature ranges.
• Radiation-hardened circuit designs.

Single Zener Diodes Procurement Notes

Verify the specific reliability level required, as commercial versions lack military qualification suffixes. Confirm RoHS compliance status if applicable, noting that compliant options are restricted to commercial grades. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component for applications requiring a 110 V reference in a surface mount form factor. Consider the 1.5 W power dissipation limit and thermal resistance when designing heat management. Verify that the 300 Ohm dynamic impedance meets the noise and stability requirements of the target circuit.

Single Zener Diodes Part Context

This part belongs to the 1N4460US through 1N4496US series of 1.5 Watt glass Zener diodes. These devices are designed as surface mount equivalents to popular JEDEC registered axial-lead series, offering similar electrical characteristics in a compact D-5A MELF package.

Single Zener Diodes Replacement Considerations

Direct replacements include other 110 V Zener diodes in the D-5A MELF package from compatible manufacturers, provided they meet the 1.5 W power rating and hermetic sealing requirements. Verify pinout compatibility and thermal performance specifications.