1N4476US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4476US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 30 V and a maximum power dissipation of 1.5 W at 25°C ambient temperature. It features a dynamic impedance of 20 Ohms at the test current of 8.5 mA, with a standard voltage tolerance of ±5%. The device operates within a junction and storage temperature range of -65°C to +175°C. It utilizes an A (D-5A) MELF package construction.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass package with internal metallurgical bonds for robust construction.
• Military qualified per MIL-PRF-19500/406 standards for high-reliability applications.
• Triple-layer passivation provides protection against environmental stressors.
• Inherently radiation hard as described in Microsemi MicroNote 050.

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges.
• High-reliability electronic systems where component failure cannot be tolerated.
• Radiation-hardened circuit designs requiring stable reference voltages.

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level and compliance status. Standard commercial versions may differ from military qualified levels regarding RoHS compliance and qualification testing. Confirm the tape and reel packaging configuration aligns with automated assembly requirements before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 30 V Zener reference is required in a surface mount form factor. Ensure the application environment supports the specified -65°C to +175°C operating range. Consider the 1.5 W power rating and thermal resistance characteristics for proper heat dissipation design in the target circuit layout.

Single Zener Diodes Part Context

This part belongs to the 1N4460US through 1N4496US series of voidless hermetically sealed surface mount Zener diodes. These devices serve as the surface mount equivalents of popular JEDEC registered axial-lead series, offering identical electrical performance in a compact D-5A MELF package suitable for dense PCB layouts.

Single Zener Diodes Replacement Considerations

Direct replacements include other parts within the 1N4460US–1N4496US series or equivalent MIL-PRF-19500/406 qualified Zener diodes in the A (D-5A) MELF package. Verify matching voltage, tolerance, and power dissipation ratings when substituting.