1N4473/TR

Single Zener Diodes Overview

The Microchip Technology 1N4473/TR is a 22 V Zener voltage regulator diode with a 5% tolerance. It operates in the DO-41 axial lead package and dissipates up to 1.5 W at a case temperature of +112 °C. The device features a hermetically sealed void-less glass construction with internal metallurgical bonds. Electrical characteristics include a maximum dynamic impedance of 14 Ohms at the test current of 11.5 mA, a maximum reverse leakage current of 0.05 µA, and a continuous current rating of 65 mA. It withstands surge currents up to 0.65 A.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• High-reliability military applications requiring failure-free operation
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened circuit designs

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level and RoHS compliance status. Commercial versions are available in tape and reel packaging, while qualified levels such as JAN or JANS may have different availability. Confirm the exact part number against the manufacturer's datasheet to ensure correct electrical parameters and package type before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 1.5 W power rating and axial lead mounting are required for high-reliability environments. Ensure the design accounts for the thermal resistance from junction to lead and the derating curve above +112 °C. Verify that the 22 V breakdown voltage aligns with the circuit requirements and that the low leakage current meets the system specifications.

Single Zener Diodes Part Context

This component belongs to the 1N4460–1N4496 series of 1.5 Watt glass Zener diodes. These devices are industry-recognized regulators ideal for applications where failure cannot be tolerated. The series offers extensive voltage selections from 3.3 to 200 volts with standard 5% tolerance, manufactured using void-less hard glass and tungsten slugs for durability.

Single Zener Diodes Replacement Considerations

Compatible substitutes within the same series include 1N4472 (20 V) and 1N4474 (24 V). For surface mount equivalents, consider the 1N4460US–1N4496US variants. Ensure any replacement maintains the 1.5 W power dissipation and hermetic sealing requirements if used in radiation-hardened or military contexts.