1N4558RB

Single Zener Diodes Overview

The Microchip Technology 1N4558RB is a silicon unidirectional voltage regulator diode housed in the TO-204AD (TO-3) hermetically sealed package. It features a nominal Zener voltage of 4.3V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 50W and supports a continuous forward current of 2900mA. Key electrical characteristics include a reverse resistance of 0.16 Ohms and a test current associated with the 4.3V regulation point.

Single Zener Diodes Feature Summary

• Hermetically sealed construction suitable for harsh environments
• High power handling capability for robust voltage regulation
• Unidirectional design for stable reference applications

Single Zener Diodes Applications

• Voltage regulation circuits
• Overvoltage protection systems
• Power supply stabilization

Single Zener Diodes Procurement Notes

Verify the specific suffix 'RB' corresponds to the required ±5% tolerance and TO-204AD package configuration. Confirm that the hermetic seal rating meets environmental specifications. Ensure the manufacturer source is authorized to guarantee component authenticity and traceability for critical applications.

Single Zener Diodes Selection Notes

Select this component when a 4.3V reference with high surge current capacity is required. The TO-3 package provides superior thermal dissipation compared to smaller packages. Verify that the 50W power rating aligns with the thermal management capabilities of the target circuit board or heatsink assembly.

Single Zener Diodes Part Context

This part belongs to the standard 1N4558 series of 50W Zener diodes. Variants such as 1N4558RA and 1N4558RC offer tighter tolerances like ±2% or ±1%, while the RB variant specifies the standard ±5% tolerance. These components are widely used in industrial and military-grade electronics requiring reliable voltage clamping.

Single Zener Diodes Replacement Considerations

Equivalent parts include JANTX1N4558RB from Microsemi or Defense Logistics Agency sources, which share identical electrical ratings and TO-3 packaging. Cross-reference with other manufacturers offering 4.3V 50W Zener diodes in TO-204AD packages.