1N4559RB

Single Zener Diodes Overview

The 1N4559RB is a unidirectional Zener voltage regulator diode manufactured by Microchip Technology. It features a nominal Zener voltage of 4.7 V and a maximum power dissipation of 50 W. The device utilizes a TO-204AD metal package with an anode-connected case. Key electrical specifications include a maximum dynamic impedance of 0.12 Ω and a maximum knee impedance of 600 Ω. It operates within a temperature range of -65 °C to 175 °C, with a leakage current of 0.1 mA and a maximum forward voltage of 1.5 V.

Single Zener Diodes Feature Summary

• High power handling capability of 50 W for robust voltage regulation
• Metal TO-204AD package construction with anode-connected case for efficient thermal management
• Low dynamic impedance of 0.12 Ω ensuring stable voltage output under varying load conditions

Single Zener Diodes Applications

• High-power voltage regulation circuits
• Industrial power supply protection
• Overvoltage protection in heavy-duty electronic systems

Single Zener Diodes Procurement Notes

Verify the manufacturer origin, as historical production involves Motorola/NXP and Microchip. Confirm the specific suffix 'RB' matches the required tolerance and specification variant. Ensure the TO-204AD package dimensions align with the target PCB footprint. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Single Zener Diodes Selection Notes

Select this component when high power dissipation (50 W) is required compared to standard low-power Zener diodes. The TO-204AD package is suitable for through-hole mounting where thermal conductivity is critical. Consider the 4.7 V nominal voltage and low dynamic impedance for applications demanding precise regulation under high current loads.

Single Zener Diodes Part Context

The 1N4559 series belongs to the family of high-power Zener diodes designed for rugged environments. Originally associated with Motorola and later NXP, the product line continues under Microchip Technology. These diodes are characterized by their metal case construction, which supports significant power handling and heat dissipation capabilities essential for industrial applications.

Single Zener Diodes Replacement Considerations

Public confirmed substitute part numbers include 1N4559A and 1N4559B. Verify that alternative variants meet the same 50 W power rating and 4.7 V Zener voltage requirements.