1N4757UR-1/TR

Overview

The Microchip Technology 1N4757UR-1/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 51 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum dynamic impedance of 95 Ohms at a test current of 5.0 mA. It includes a hermetically sealed glass construction, leadless design for high-density mounting, and inherent radiation hardness.

Feature Summary

• Hermetically sealed glass MELF package
• Inherently radiation hard per MicroNote 050
• Leadless surface mount design
• ESD nonsensitive

Applications

• Voltage regulation over broad operating current and temperature ranges
• High density circuit board mounting
• Low parasitic requirement applications
• High reliability applications requiring source control drawings

Procurement Notes

Verify that the part number suffix matches the required specifications. Confirm whether the 'e3' RoHS-compliant variant or the standard tin-lead terminal version is needed. Ensure the tape and reel packaging configuration aligns with manufacturing equipment requirements. Cross-reference the specific electrical characteristics against the official datasheet table for the 1N4757AUR series.

Selection Notes

Select this component when a 1.0 W power rating and 51 V regulation are required in a compact surface mount form factor. Consider the DO-213AB package for space-constrained designs needing low parasitics. Evaluate the wide operating temperature range for harsh environments. Verify if radiation hardness is necessary for the target application scenario.

Part Context

This component belongs to the 1N4728AUR through 1N4764AUR series of surface mount Zener diodes manufactured by Microchip Technology's Scottsdale Division. These devices are electrically equivalent to the JEDEC registered 1N4728A through 1N4764A axial-leaded series but utilize the DO-213AB outline. The series offers a wide selection of voltages from 3.3 V to 100 V.

Replacement Considerations

Surface mount equivalents include SMAJ4757A and SMAJ4757A. Plastic body axial-leaded equivalents are available as 1N4757A. Alternate naming may refer to the MLL4757A series.