1N4973US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4973US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 43 V and a 5 W power dissipation rating. It operates within a junction temperature range of -65°C to +175°C. The device features a maximum reverse leakage current of 2 µA at 32.7 V, a dynamic impedance of 20 Ohms at the test current of 30 mA, and a forward voltage of 1.5 V at 1 A. It utilizes an E-MELF (D-5B) package.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high reliability
• Military qualified to MIL-PRF-19500/356 standards
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify that the ordering suffix /TR indicates tape and reel packaging per EIA-481-B standards. Confirm the specific military qualification level required, as JAN, JANTX, JANTXV, and JANS variants exist within this series. Ensure the procurement documentation matches the exact part number to guarantee the correct tolerance and package configuration.

Single Zener Diodes Selection Notes

Select this component when a 5 W surface mount Zener diode with military-grade hermetic sealing is required. The 43 V nominal voltage and 5% standard tolerance suit general voltage regulation needs. Consider the wide operating temperature range and radiation hardness for aerospace or defense environments requiring robust semiconductor protection.

Single Zener Diodes Part Context

This device belongs to the 1N4954US through 1N4996US series of surface mount Zener voltage regulators manufactured by Microsemi (now Microchip Technology). These components are designed for high-power applications in compact surface mount footprints, offering industry-standard performance with enhanced durability compared to non-hermetic alternatives.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents such as 1N4973 are available by deleting the US suffix. Other voltage ratings within the same series include 1N4972US (39 V) and 1N4974US (47 V). Verify package compatibility and thermal requirements when substituting.