1N4557RB

Single Zener Diodes Overview

The Microchip Technology 1N4557RB is a single Zener diode designed for high-power voltage regulation applications. It features a nominal Zener voltage of 3.9V with a power dissipation rating of 50W. The component utilizes a TO-204AD (TO-3) through-hole package, suitable for robust industrial and military environments. The JEDEC type number includes a B suffix indicating a +/- 5% tolerance on the nominal Zener voltage.

Single Zener Diodes Feature Summary

• High power dissipation capability of 50W for stable voltage regulation under heavy loads
• JEDEC standardized type numbering with specified voltage tolerance for reliability
• Robust TO-204AD axial leaded package construction

Single Zener Diodes Applications

• High-power voltage reference circuits
• Industrial power supply regulation
• Military and aerospace electronic systems

Single Zener Diodes Procurement Notes

Verify the manufacturer part number 1N4557RB against official Microchip or authorized distributor documentation to ensure authenticity. Confirm the package style is TO-204AD and the voltage rating is 3.9V. Check for specific suffixes such as JAN or JANTX if radiation hardness or enhanced quality levels are required for your application.

Single Zener Diodes Selection Notes

Select this component when a 50W Zener diode with a 3.9V breakdown voltage is required in a TO-204AD package. Ensure the thermal management design supports the full power dissipation rating. Consider alternative suffixes like JAN or JANTX if specific military or space-grade qualification standards are mandated by the system requirements.

Single Zener Diodes Part Context

This device belongs to the 1N4557 series of 50 Watt Zener Diodes manufactured by Microchip Technology. The series offers various voltage options within the same power and package constraints. The RB suffix typically denotes specific manufacturing or packaging variations within the broader product line, maintaining compatibility with standard JEDEC specifications for high-power rectifiers and regulators.

Single Zener Diodes Replacement Considerations

Publicly confirmed substitute part numbers include 1N4557B, 1N4557RB+JAN, 1N4557RB+JANTX, and 1N4557RB+JANTXV. Verify that any replacement maintains the 50W power rating, 3.9V Zener voltage, and TO-204AD package dimensions to ensure mechanical and electrical compatibility.