1N4758A

Overview

The SMC Diode Solutions 1N4758A is a silicon planar power Zener diode designed for voltage regulation and clipping applications. It features a nominal Zener voltage of 56 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W at an ambient temperature of 50°C, requiring derating above this threshold. It utilizes a DO-41 glass axial package suitable for through-hole mounting. Key electrical characteristics include a forward voltage of less than 1.2 V at 200 mA and a maximum reverse leakage current of 5 µA at 42.6 V. The component supports a junction temperature range up to 200°C.

Feature Summary

• Provides stable voltage regulation in circuits subject to current or temperature variations
• Utilizes glass passivation for hermetic sealing and enhanced stability
• Designed for general-purpose industrial and military applications

Applications

• Voltage stabilization circuits
• Signal clipping applications
• General purpose industrial equipment
• Military and space electronics

Procurement Notes

Verify the specific manufacturer designation when sourcing, as multiple vendors produce the 1N4758A part number. Confirm that the received component matches the required DO-41 package and 1W power rating specifications. Ensure compliance with RoHS standards if applicable to the assembly process. Cross-reference datasheets from different suppliers to confirm identical electrical parameters before integration into designs.

Selection Notes

Select this component for applications requiring a precise 56 V reference point with moderate power handling capabilities. The DO-41 package offers robust mechanical stability for through-hole implementations. Consider the thermal derating requirements when designing enclosures to ensure the junction temperature remains within safe operating limits during continuous operation.

Part Context

The 1N4758A belongs to the standard 1N47xx series of silicon Zener diodes, widely used for low-to-medium power voltage regulation. This series is characterized by its glass passivated planar construction, which provides excellent reliability and consistent performance across varying environmental conditions. The 56 V variant is commonly utilized in power supply feedback loops and protection circuits.

Replacement Considerations

Direct substitutes include parts from other manufacturers such as Vishay, onsemi, and Micro Commercial Components, provided they adhere to the same 1N4758A specification. Verify that alternative sources offer identical Zener voltage tolerances and power dissipation ratings to maintain circuit integrity without redesign.