1N4734UR-1

Overview

The Microsemi Corporation 1N4734UR-1 is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 5.6V with a tolerance of 5%. The device is rated for a power dissipation of 1W and utilizes the DO-213AB (MELF-2) hermetically sealed glass package. Key electrical characteristics include a maximum dynamic impedance of 5 ohms and a maximum reverse leakage current of 5 uA. It operates within a temperature range extending up to 175°C, ensuring reliability in demanding environments.

Feature Summary

• Hermetically sealed glass MELF-2 construction for environmental protection
• High-reliability design suitable for critical electronic systems
• Single unidirectional configuration for precise voltage clamping

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection in sensitive semiconductor interfaces
• Clamping applications in high-reliability aerospace or military electronics

Procurement Notes

Verify the specific suffix UR-1 against official Microsemi documentation to confirm exact screening levels and testing standards. Ensure compatibility with existing board layouts regarding the DO-213AB footprint. Confirm RoHS status as historical data indicates non-compliance for this specific variant. Validate supply chain authenticity through authorized channels due to the component's specialized nature.

Selection Notes

Select this component when a hermetically sealed, high-reliability Zener diode is required for 5.6V regulation. The DO-213AB package offers a compact form factor compared to axial leads. Consider the 1W power rating for thermal management needs. Compare against standard commercial variants if hermetic sealing is not strictly necessary for the application environment.

Part Context

This part belongs to the broader 1N4734 series of Zener diodes, which are widely used for voltage regulation. Microsemi produces various packaging options for this voltage rating, including plastic axial and hermetic MELF styles. The UR-1 designation specifically denotes the hermetically sealed glass MELF configuration, distinguishing it from standard commercial equivalents like the 1N4734A.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4734 devices in the DO-213AB package. Verify that replacement parts meet the same hermetic sealing requirements and electrical specifications. Cross-reference with Microchip Technology datasheets for equivalent performance metrics.