1N4747AH

Overview

The Taiwan Semiconductor 1N4747AH is a single-channel voltage regulator diode with a nominal Zener voltage of 20 V and a maximum power dissipation of 1 W. It utilizes a DO-41 through-hole package with two pins. The device features a 5% voltage tolerance, a test current of 12.5 mA, and a maximum Zener impedance of 22 Ω. Operating temperatures range from -65°C to 200°C, with a maximum reverse leakage current of 5 μA.

Feature Summary

• Provides stable voltage regulation at a nominal 20 V level for circuit protection and reference applications.
• Engineered for high thermal stability with an extended operating temperature range up to 200°C.
• Constructed in a glass-passivated DO-41 axial leaded package suitable for robust through-hole mounting.

Applications

• Voltage regulation in general-purpose electronic circuits
• Overvoltage protection for sensitive components
• Reference voltage sources in measurement equipment

Procurement Notes

Verify the specific suffix 'H' against official datasheets to confirm if it denotes a specific tolerance grade or environmental certification distinct from the standard 1N4747A. Ensure the selected component matches the required DO-41 package dimensions and lead configuration for your PCB layout. Cross-reference manufacturer documentation for any updates regarding RoHS compliance status or material declarations.

Selection Notes

Select this component when a 20 V regulation point is required within a 1 W power budget. The DO-41 package offers reliable mechanical retention for through-hole assembly processes. Consider the 5% tolerance and 22 Ω impedance characteristics to ensure compatibility with the target circuit's precision requirements and load conditions.

Part Context

This part belongs to the 1N47 series of silicon planar power Zener diodes manufactured by Taiwan Semiconductor. These devices are designed for general-purpose voltage regulation tasks. The series typically covers a wide range of voltage values, with the 1N4747 variant specifically targeting the 20 V market segment using standard axial glass passivation technology.

Replacement Considerations

Compatible substitutes include onsemi 1N4747A, Vishay Semiconductors 1N4747A-TR, STMicroelectronics 1N4747A, and Microchip Technology 1N4747AUR (note: different package). Verify pinout compatibility and electrical parameter equivalence before substitution.