1N4747A-TR

Overview

The Vishay 1N4747A-TR is a silicon planar power Zener diode in the DO-41 (DO-204AL) axial package. It provides a nominal Zener voltage of 20 V with a standard tolerance of ±5 %. The device operates at a test current of 12.5 mA and features a maximum dynamic resistance of 22 Ω. It supports a peak power dissipation of 1300 mW under surge conditions and maintains a junction temperature rating up to 175 °C.

Feature Summary

• Utilizes silicon planar technology for robust voltage regulation
• Designed for high-power stabilization and clipping applications
• Features glass passivation for environmental protection

Applications

• Voltage stabilization circuits
• Signal clipping applications
• Power supply reference elements

Procurement Notes

Verify that the ordering suffix matches the required tape-and-reel packaging configuration. Confirm compliance with RoHS directives and material categorization standards as defined by Vishay. Ensure thermal management aligns with the specified junction-to-ambient thermal resistance limits during operation.

Selection Notes

Select this component when a 20 V reference with ±5 % accuracy is required. Consider the 12.5 mA test current for biasing calculations. Evaluate the 1300 mW surge capability against transient load requirements. Verify that the DO-41 through-hole package fits the target PCB layout constraints.

Part Context

This part belongs to the Vishay 1N4728A to 1N4761A series, which covers a wide range of Zener voltages from 3.3 V to 75 V. All devices in this family share the same DO-41 axial package and standardized electrical testing parameters, ensuring consistent mechanical integration across different voltage ratings.

Replacement Considerations

Cross-reference with other manufacturers' 1N4747A equivalents. Verify that substitute parts meet the identical 20 V nominal voltage, ±5 % tolerance, and 1 W continuous power dissipation specifications to maintain circuit performance integrity.