1N4558A

Single Zener Diodes Overview

The Microchip Technology 1N4558A is a silicon unidirectional voltage regulator diode designed for high-power applications. It features a nominal Zener voltage of 4.3 V and a maximum power dissipation of 50 W. The device supports a maximum forward current of 2900 mA and exhibits a low dynamic impedance of 0.16 Ohms. Housed in the TO-204AD (TO-3) through-hole package, it provides robust performance for voltage regulation tasks requiring significant power handling capabilities.

Single Zener Diodes Feature Summary

• High power dissipation capability of 50 W for demanding thermal environments
• Low dynamic impedance ensuring stable voltage regulation under varying load conditions
• Hermetically sealed construction suitable for harsh operating conditions

Single Zener Diodes Applications

• Current balancing circuits for parallel-connected Hall elements
• High-power voltage reference applications
• Industrial power supply regulation

Single Zener Diodes Procurement Notes

Verify the specific manufacturer source, as components are available from multiple vendors including Microchip and legacy distributors. Confirm the package type matches the required TO-204AD specification. Ensure the part number suffix aligns with the desired tolerance and hermetic sealing requirements before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 4.3 V regulation point is required with substantial power handling needs. The TO-3 package necessitates appropriate heatsinking solutions due to the 50 W rating. Consider the ±10% tolerance standard unless a tighter variant like JANTX1N4558R is specified for precision applications.

Single Zener Diodes Part Context

This part belongs to the family of high-power silicon Zener diodes. Variants such as JANTX1N4558R offer tighter tolerances (down to 1%) and hermetic sealing for military or aerospace use. The standard 1N4558A serves as the baseline commercial/industrial grade option within this regulatory diode series.

Single Zener Diodes Replacement Considerations

Direct substitutes include JANTX1N4558R variants which share the 4.3 V, 50 W specifications but differ in tolerance and sealing. Verify pinout compatibility with the TO-3 package when cross-referencing with other manufacturers' equivalents.