1N4747A

Overview

The Lumimax Optoelectronic Technology 1N4747A is a silicon planar power Zener diode housed in a DO-41 glass axial package. It provides a nominal Zener voltage of 20V with a tolerance of ±5%. The device supports a maximum power dissipation of 1W and features a low Zener impedance of 22Ω. Electrical characteristics are defined at a test current, with a maximum reverse leakage current of 5µA at 15.2V. The junction temperature rating reaches 200°C, and the storage temperature range spans from -65°C to +200°C.

Feature Summary

• Glass passivated junction for enhanced stability
• Low Zener impedance and regulation factor
• High temperature soldering capability guaranteed

Applications

• Voltage stabilization circuits
• Clipping circuits requiring high power ratings
• General purpose voltage reference applications

Procurement Notes

Verify the manufacturer designation as Lumimax Optoelectronic Technology against standard industry listings, as this part number is widely produced by multiple semiconductor vendors. Confirm that the specific datasheet provided matches the exact electrical parameters required for your design, particularly the 22Ω impedance and 5µA leakage limits. Ensure the DO-41 glass package dimensions align with your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when a precise 20V reference with tight ±5% tolerance is required in a through-hole configuration. The 1W power rating allows for robust performance in moderate current applications compared to lower-power variants. Consider the DO-41 glass package for its thermal resilience and the guaranteed high-temperature soldering capability if lead-free or high-heat assembly processes are utilized.

Part Context

This component belongs to the 1N47xxA series of power Zener diodes, which covers a wide voltage range from 3.3V to 75V. The 'A' suffix specifically denotes the tighter ±5% voltage tolerance band, distinguishing it from standard tolerance versions. The series utilizes a standardized JEDEC DO-41 glass molded body, ensuring mechanical compatibility across different manufacturers within this product family.

Replacement Considerations

Cross-reference with other manufacturers offering the 1N4747A specification, such as onsemi, STMicroelectronics, or Microchip Technology. Verify that substitute parts maintain the identical 20V Zener voltage, 1W power dissipation, and 22Ω maximum impedance to ensure circuit functionality remains unchanged.