1N4747A-T

Overview

The Diodes Incorporated 1N4747A-T is a silicon planar power Zener diode housed in a DO-41 glass axial package. It provides a nominal Zener voltage of 20 V with a standard tolerance of ±5%. The device supports a maximum power dissipation of 1.0 W at 25°C, derating linearly above this temperature. Electrical characteristics include a test current of 12.5 mA, a maximum Zener impedance of 22 Ω, and a maximum reverse leakage current of 5 µA. The component operates within a junction and storage temperature range of -65°C to +175°C.

Feature Summary

• Utilizes a glass passivated die construction for robust performance
• Features lead-free finish compliant with RoHS directives
• Provides standardized voltage tolerance for consistent regulation
• Offers high thermal stability across a wide operating temperature range

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection for sensitive electronic components
• General-purpose voltage regulation in power supplies

Procurement Notes

Verify the specific suffix '-T' corresponds to tape and reel packaging rather than bulk ammo pack configurations. Confirm that the component status aligns with current design requirements, as datasheets may indicate recommendations against new designs for certain series members. Ensure compliance with environmental directives relevant to the target market before finalizing procurement orders.

Selection Notes

Select this component when a 20 V Zener voltage with ±5% tolerance is required in an axial glass package. Consider the 1.0 W power dissipation capability and the specific thermal resistance characteristics for heat management. Evaluate the 22 Ω maximum impedance and 5 µA leakage current against circuit sensitivity requirements to ensure adequate performance for the intended application.

Part Context

This part belongs to the 1N4728A through 1N4761A series of 1.0 Watt Zener diodes manufactured by Diodes Incorporated. The series covers a broad range of nominal voltages from 3.3 V to 75 V. The 1N4747A specifically addresses applications needing a 20 V breakdown voltage within this standardized product family.

Replacement Considerations

The datasheet explicitly recommends using the DFLZxx series instead of this component for new designs.