1N4473US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4473US/TR 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 0.25 µA at 17.6 V. It utilizes a voidless hermetically sealed glass package (A, SQ-MELF) and is qualified per MIL-PRF-19500/406.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction using internal metallurgical bonds for robust reliability.
• Military qualification per MIL-PRF-19500/406 suitable for high-reliability applications.
• Inherently radiation hard as described in Microsemi MicroNote 050.

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level and RoHS compliance status. Confirm the package type corresponds to the A, SQ-MELF form factor. Ensure the requested quantity aligns with tape and reel packaging standards defined by EIA-481-B. Cross-reference the part number against the latest manufacturer documentation to confirm availability and lead times.

Single Zener Diodes Selection Notes

Select this component when a 22.0 V reference is required in a surface mount configuration. Consider the 1.5 W power dissipation capability and the wide thermal operating range. Verify that the ±5% tolerance meets circuit requirements. Evaluate the low reverse leakage current for sensitive biasing networks. Ensure the design accommodates the specific MELF footprint dimensions.

Single Zener Diodes Part Context

This device belongs to the 1N4460US through 1N4496US series of industry-recognized 1.5 watt Zener voltage regulators. These components are designed as surface mount equivalents to popular JEDEC registered axial-lead series. The series offers extensive voltage selections from 3.3 to 200 volts with various tolerance options available.

Single Zener Diodes Replacement Considerations

Direct replacements include other parts within the 1N4460US–1N4496US series or their commercial equivalents. Axial-lead versions such as 1N4473 may serve as functional substitutes if board layout permits. Verify pinout compatibility and thermal characteristics before substitution.