1N4757AUR

Overview

The Microchip Technology 1N4757AUR is a surface mountable 1.0 W glass Zener diode designed for high-density voltage regulation applications. It features a 51 V nominal Zener voltage with a standard tolerance of ±5%. The device utilizes a DO-213AB (MELF) hermetically sealed glass package, providing electrical equivalence to the through-hole 1N4757A in the DO-41 outline while meeting JEDEC surface mount standards. Constructed from silicon, it offers isolated case connections and single-diode configuration.

Feature Summary

• Hermetically sealed glass construction ensures reliability under demanding conditions
• Surface mount MELF package enables low parasitic performance and high density mounting
• Electrically equivalent to registered DO-41 equivalents for simplified design transitions

Applications

• Voltage regulation in high-density circuit boards
• Clipping circuits requiring low parasitic characteristics
• High reliability applications specified by source control drawings

Procurement Notes

Verify the specific suffix against the official datasheet to confirm compliance status and screening level. The base part number corresponds to the standard commercial grade; suffixes such as 'e3' indicate RoHS compliance. Ensure the ordering code matches the required hermetic sealing and tolerance specifications for the target application environment.

Selection Notes

Select this component when a surface mount solution is required that maintains the electrical profile of traditional axial lead Zener diodes. The DO-213AB package is suitable for automated assembly processes. Consider the ±5% voltage tolerance as the standard offering, with tighter tolerances available upon request for precision regulation needs.

Part Context

This device belongs to the 1N4728A through 1N4764A series of 1-watt Zener diodes manufactured by Microsemi, now part of Microchip Technology. The series provides extensive voltage selection ranging from 3.3 V to 100 V. The 1N4757 variant specifically targets the 51 V regulation point within this broad portfolio.

Replacement Considerations

Direct replacements include MLL4757AUR and MSP1N4757AURE3TR. These variants share the same DO-213AB package and 51 V specification. Verify RoHS compliance requirements when substituting non-e3 suffix parts.