1N4730AUR

Overview

The Microchip Technology 1N4730AUR is a hermetically sealed glass Zener voltage regulator diode licensed from ON Semiconductor. It features a nominal Zener voltage of 3.9V with a tolerance of 5% and a maximum dynamic impedance of 9Ω. The device operates in the DO-204AL (DO-41) axial leaded package and supports a maximum steady-state power dissipation of 1W at ambient temperatures up to 50°C, with derating above this threshold. It offers an extended operating and storage temperature range from -65°C to +200°C and includes an ESD rating of Class 3 (>6 kV) per the Human Body Model.

Feature Summary

• Hermetically sealed glass construction utilizing metallurgically bonded double slug type design for high reliability
• Oxide passivated die structure providing robust protection against environmental factors
• High electrostatic discharge resilience rated at Class 3 exceeding 6 kV under human body model testing

Applications

• Voltage regulation in high-reliability aerospace systems
• Clipping circuits requiring stable reference voltages
• Protection stages in harsh environment industrial electronics

Procurement Notes

Verify the specific suffix 'UR' against the manufacturer's current datasheet to confirm tape-and-reel packaging and exact lot traceability requirements. Ensure that the hermetic seal specifications align with your system's environmental sealing standards. Confirm RoHS compliance status as historical variants may differ. Cross-reference the licensing information with ON Semiconductor to validate component authenticity and sourcing channels.

Selection Notes

Select this component when a hermetically sealed axial leaded Zener diode is required for critical applications. The 3.9V nominal voltage and 5% tolerance suit precise reference needs. Consider the 1W power rating and wide temperature range for thermal management. Verify that the DO-41 package dimensions fit the PCB layout constraints compared to surface mount alternatives.

Part Context

This part belongs to the 1N47 series of one-watt Zener diodes, licensed by Microchip Technology from ON Semiconductor. The series covers a broad voltage range from 3.3V to 100V. The 'A' suffix typically denotes tighter tolerance compared to standard versions, while the 'UR' indicates reel packaging. These devices are engineered for stability in demanding electronic environments.

Replacement Considerations

Direct substitutes include other hermetically sealed 1N4730A variants from manufacturers like Microsemi or Tak Cheong. Surface mount equivalents such as SMAJ4730A or MLL4730A are available but require package adaptation. Verify that replacement parts maintain the same 3.9V Zener voltage, 5% tolerance, and 1W power dissipation ratings.