1N4748A

Overview

The Lumimax Optoelectronic Technology 1N4748A is a silicon planar Zener diode housed in a hermetically sealed glass DO-41 package. It provides a nominal Zener voltage of 22V with a tolerance of ±5%. The device supports a maximum power dissipation of 1W and features a junction temperature rating up to 200°C. Key electrical characteristics include a maximum dynamic impedance of 23 Ohms and a forward voltage of 1.2V at 200mA. Reverse leakage current is specified at 5µA when tested at 16.7V.

Feature Summary

• Glass passivated junction construction for enhanced stability
• Low Zener impedance and low regulation factor
• High temperature soldering capability guaranteed at 260°C

Applications

• Voltage regulation in stabilized power supplies
• Reference voltage sources in electronic circuits
• Overvoltage protection applications

Procurement Notes

Verify the specific manufacturer designation, as Lumimax Optoelectronic Technology may source or rebrand components originally manufactured by other semiconductor providers. Confirm RoHS compliance status and lead time requirements directly with the supplier, as these attributes vary significantly across different production batches and original equipment manufacturers associated with this part number.

Selection Notes

Select this component for applications requiring a precise 22V reference within a standard axial leaded package. Ensure the circuit design accommodates the 1W power dissipation limit and the 23 Ohm dynamic impedance. Verify that the operating environment remains within the specified -65°C to +200°C storage range and that thermal management strategies account for the 170°C/W thermal resistance.

Part Context

This component belongs to the widely recognized 1N47xx series of 1-watt Zener diodes. The 'A' suffix denotes a tighter ±5% voltage tolerance compared to standard variants. The DO-41 glass package offers hermetic sealing, distinguishing it from plastic encapsulated alternatives while maintaining compatibility with standard through-hole mounting techniques used in general-purpose electronics manufacturing.

Replacement Considerations

Compatible substitutes include the Microsemi 1N4748AG and ON Semiconductor 1N4748ATA. These parts share identical electrical specifications and mechanical dimensions, allowing for direct pin-for-pin replacement in existing designs without circuit modification.