1N4471DUS

Single Zener Diodes Overview

The Microchip Technology 1N4471DUS is a surface mount, hermetically sealed glass Zener diode with a nominal voltage of 18.0 V and a tight tolerance of ±1%. 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 an A (D-5A) MELF package, internal metallurgical bonds, triple-layer passivation, and void-less construction.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass package with tungsten slugs for robustness
• Internal Category 1 metallurgical bonds ensuring structural integrity
• Triple-layer passivation providing enhanced environmental protection
• Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020

Single Zener Diodes Applications

• High-reliability aerospace and defense circuits
• Military-grade voltage regulation systems
• Radiation-hardened electronic designs
• Critical power supply reference applications

Single Zener Diodes Procurement Notes

Verify the specific reliability level required, as the D suffix indicates a 1% tolerance but does not inherently define the military qualification class (JAN, JANTX, JANTXV, or JANS). Confirm RoHS compliance status, noting that lead-free versions are typically restricted to commercial grades. Ensure the ordering suffix matches the exact package and tolerance specifications needed for your design.

Single Zener Diodes Selection Notes

Select this component when high-reliability surface mount Zener regulation is required in harsh environments. The 1N4471DUS provides precise voltage control with a 1% tolerance, suitable for sensitive analog references. Consider its 1.5 W power rating and wide operating temperature range for thermal management planning in compact MELF packages.

Single Zener Diodes Part Context

This part belongs to the 1N4460US through 1N4496US series of 1.5 Watt Glass Zener Diodes. These devices are industry-recognized equivalents to popular JEDEC registered axial-lead series but offer superior surface mount integration. They are designed for applications where failure cannot be tolerated, leveraging advanced glass encapsulation techniques.

Single Zener Diodes Replacement Considerations

Direct replacements include other 1N4471 variants from the same series, such as the standard 1N4471US (±5% tolerance) or higher reliability levels like 1N4471US C (±2%). Verify that any substitute maintains the required 18.0 V nominal voltage and MELF package dimensions for proper board compatibility.

Single Zener Diodes FAQ

What does the 'D' suffix indicate in the 1N4471DUS part number?

The 'D' suffix specifies a tighter voltage tolerance of ±1%, compared to the standard ±5% tolerance found in parts without a suffix.

Is the 1N4471DUS radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050, making it suitable for space and high-radiation environments.