1N4758A

Overview

The onsemi 1N4758A is a single silicon unidirectional 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 power dissipation of 1 W at an ambient temperature of 50°C, with derating required above this threshold. It operates within a junction temperature range of -65°C to +200°C. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 110 Ohms measured at a test current of 4.5 mA.

Feature Summary

• Glass passivated chip construction providing hermetic sealing for enhanced stability and reliability.
• Designed for general-purpose industrial, entertainment, military, and space applications.
• Capable of stabilizing voltages in circuits requiring high power ratings.

Applications

• Voltage stabilization circuits
• Signal clipping applications
• Industrial equipment power supplies
• Military and aerospace electronic systems

Procurement Notes

Verify the specific manufacturer source when ordering, as the 1N4758A designation is utilized by multiple semiconductor producers including onsemi, Central Semiconductor, and others. Confirm that the component meets RoHS compliance requirements if necessary for your assembly process. Ensure the package type matches the DO-41 axial leaded format specified in the datasheet. Check for any specific suffixes that may indicate tape-and-reel packaging versus bulk quantities.

Selection Notes

Select the 1N4758A when a precise 56 V reference or regulation point is required in through-hole designs. Consider the 1 W power rating and ensure adequate thermal management is provided, particularly if operating above 50°C ambient temperature. Verify that the 5% voltage tolerance aligns with circuit precision requirements. The DO-41 package is suitable for standard PCB mounting techniques.

Part Context

This component belongs to the broader family of 1.0 Watt Silicon Zener Diodes, typically spanning voltage ranges from 3.3V to 100V. The 1N4758A specifically addresses the mid-range voltage requirement within this series. It utilizes a glass-passivated planar structure, which distinguishes it from older junction-type technologies. This construction method ensures consistent performance across the specified temperature range.

Replacement Considerations

Cross-reference with other manufacturers' 1N4758A parts such as those from Central Semiconductor or Micro Commercial Components. Verify pinout compatibility and physical dimensions of the DO-41 package before substitution. Ensure equivalent electrical parameters, specifically the 56 V Zener voltage and 1 W power dissipation rating.