1N4746A

Overview

The Lumimax Optoelectronic Technology 1N4746A is a silicon Zener diode featuring an 18V nominal breakdown voltage with a ±5% tolerance. It operates within the 1N47xxA series and provides a peak pulse power rating of 1W. The device utilizes a glass passivated junction housed in a JEDEC DO-41 molded glass body with plated axial leads. Electrical characteristics include a maximum dynamic impedance of 20 Ohms, a reverse leakage current of 5 µA at 13.7V, and a forward voltage of 1.2V at 200mA. Thermal resistance from junction to ambient is rated at 170°C/W.

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 circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify the manufacturer designation as Lumimax Optoelectronic Technology when sourcing this component. Confirm that the package matches the standard JEDEC DO-41 form factor. Ensure the suffix 'A' corresponds to the required ±5% voltage tolerance specification. Check datasheet revisions for any updates regarding thermal or electrical limits before finalizing procurement.

Selection Notes

Select this component for applications requiring a stable 18V reference point with moderate power handling capabilities. The DO-41 through-hole package facilitates easy integration into standard PCB layouts. Consider the 170°C/W thermal resistance for heat dissipation planning in enclosed environments. Verify compatibility with operating temperatures ranging from -65°C to +200°C.

Part Context

This part belongs to the 1N47xxA series of Zener diodes manufactured by Lumimax Optoelectronic Technology. The series covers a wide range of voltages from 3.3V to 75V, all sharing similar mechanical and electrical characteristics. The 1N4746A specifically targets the 18V segment of this lineup, offering consistent performance across the family.

Replacement Considerations

Cross-reference with other manufacturers' 1N4746A parts to ensure pinout and tolerance compatibility. Verify that substitute components meet the same 1W power dissipation and DO-41 package requirements.