1N4749UR-1

Overview

The 1N4749UR-1 is a hermetically sealed Zener diode manufactured by Microchip Technology. It features a 24V nominal Zener voltage with a 10% tolerance and a 1W power dissipation rating. The component utilizes a DO-213AB glass MELF package for surface mount installation. It operates within a temperature range of -65°C to +175°C, ensuring reliability in harsh environments.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• High thermal stability supporting extended operating temperatures
• Surface mount MELF package design for automated assembly

Applications

• Military aerospace electronic systems
• High-reliability industrial control circuits
• Harsh environment voltage regulation

Procurement Notes

Verify the specific suffix UR-1 against official Microchip documentation to confirm hermetic sealing status and exact electrical tolerances. Ensure the procurement channel provides traceability certificates required for high-reliability applications. Confirm RoHS compliance status as indicated in manufacturer specifications before finalizing orders.

Selection Notes

Select this component when hermetic sealing is mandatory for circuit protection. The DO-213AB package requires appropriate surface mount footprint design. Verify that the 24V breakdown voltage aligns with system requirements. Consider the 1W power rating for thermal management in enclosed designs.

Part Context

This part belongs to the 1N47xx series of Zener diodes produced by Microchip Technology. It serves as a high-reliability alternative to standard commercial grade diodes. The series is widely used in critical infrastructure where component failure is not an option.

FAQ

Is the 1N4749UR-1 hermetically sealed?

Yes, the datasheet description identifies it as a hermetically sealed glass device.

What is the maximum operating temperature?

The maximum operating temperature is specified as 175°C.