1N4473US

Single Zener Diodes Overview

The Microchip Technology 1N4473US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 22.0 V and a standard tolerance of ±5%. 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 maximum dynamic impedance of 14 Ohms at the test current of 11.5 mA, with a maximum reverse leakage current of 0.05 µA at 17.6 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 across multiple reliability levels
• 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 the part number suffix determines qualification status under MIL-PRF-19500/406. Confirm RoHS compliance requirements, noting that compliant versions are restricted to commercial grade only. Ensure the ordering nomenclature correctly reflects the desired tolerance and package configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for harsh environments. The 1N4473US provides a 22.0 V reference point with low leakage characteristics. Consider the thermal resistance and derating curves if operating near the maximum power dissipation limit or in elevated ambient temperatures.

Single Zener Diodes Part Context

This device belongs to the 1N4460US through 1N4496US series of 1.5-watt glass Zener diodes. These components serve as surface mount equivalents to popular JEDEC registered axial-lead series. The series offers extensive voltage selections from 3.3 V to 200 V with various tolerance options.

Single Zener Diodes Replacement Considerations

Direct replacements include other parts within the 1N4460US–1N4496US series or their axial-lead counterparts 1N4460–1N4496. Verify that substitute components match the required MIL-PRF-19500/406 qualification level and MELF package dimensions.