1N5943BUR-1

Single Zener Diodes Overview

The Microchip Technology 1N5943BUR-1 is a surface-mountable 1.5 W Zener diode housed in the JEDEC DO-213AB MELF package. It serves as the metallurgically bonded glass equivalent to the axial-leaded 1N5943B series, offering a Zener voltage of 56 V with a 5% tolerance. The device operates within a junction temperature range of -65°C to +175°C and features hermetically sealed construction for high reliability.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs for enhanced thermal performance and reliability.
• Metallurgically enhanced internal contact design providing lower thermal resistance and greater durability.
• Non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 method 1020.
• Inherently radiation hard, suitable for demanding aerospace and defense environments.

Single Zener Diodes Applications

• Voltage regulation over broad ranges of operation current and temperature.
• High-density surface mounting where low parasitic requirements are critical.
• High reliability applications requiring screening in accordance with MIL-PRF-19500.

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix against the manufacturer's nomenclature guide to confirm RoHS compliance status and tolerance level. Ensure the required screening level matches the project's source control drawing requirements. Confirm tape and reel availability if automated assembly is planned, noting that standard quantities may require factory consultation.

Single Zener Diodes Selection Notes

Select this component when a leadless MELF package is preferred over axial leads for space-constrained designs. Consider the 56 V breakdown voltage and 5% tolerance for precise regulation needs. Evaluate the thermal resistance specifications against the system's heat dissipation capabilities to ensure stable operation under maximum power dissipation conditions.

Single Zener Diodes Part Context

This part belongs to the 1N5913BUR-1 through 1N5956BUR-1 series of 1.5 W Zener diodes. It is functionally similar to the CDLL5913–CDLL5956 series but utilizes an enhanced metallurgical bond. The series provides a wide range of voltages from 3.3 V to 200 V in a compact surface-mount form factor.

Single Zener Diodes Replacement Considerations

Direct equivalents include the axial-leaded 1N5943B and the CDLL5943B. Surface-mount alternatives in different packages include SMBG(J)5943B, SMAJ5943B, and 1PMT5943B, provided mechanical fit and thermal constraints are met.