1N4732A-T

Overview

The 1N4732A-T is a discontinued 1.0 W silicon planar Zener diode manufactured by Diodes Incorporated in the DO-41 glass axial package. It provides a nominal Zener voltage of 4.7 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse leakage current of 10 µA at 1.0 V. Electrical characteristics include a test current of 53 mA, a maximum Zener impedance of 8 Ω at IZT, and a thermal resistance of 175 °C/W.

Feature Summary

• Provides stable voltage regulation through a high-power 1.0 W dissipation capability.
• Constructed with a hermetically sealed glass case for environmental protection.
• Features built-in strain relief on axial leads to ensure mechanical durability during soldering.

Applications

• Voltage reference circuits
• Overvoltage protection systems
• Clipping and waveform shaping applications

Procurement Notes

This component is officially marked as obsolete with no alternate part available from the manufacturer. Verification of availability must rely on secondary market sources or surplus distributors. Procurement requires confirmation that the specific lot matches the original specifications, as replacement components may differ in packaging suffixes or manufacturing origin despite identical part numbers.

Selection Notes

Selection should focus on verifying the exact voltage tolerance requirements, as the standard tolerance is ±5%. Designers must account for the power derating curve above 50°C ambient temperature to prevent thermal failure. The DO-41 package limits suitability for high-density surface mount designs; alternative packages such as MELF are required if space constraints exist.

Part Context

The 1N4732A-T belongs to the 1N4728A through 1N4761A series of 1 Watt Zener diodes produced by Diodes Incorporated. This series covers a wide range of nominal voltages from 3.3V to 75V. The product line utilizes a standardized DO-41 glass case construction common across the family for consistent mechanical and thermal performance.

Replacement Considerations

The datasheet explicitly states there is no alternate part available from Diodes Incorporated. Cross-manufacturer equivalents such as Nexperia 1N4731A or Microsemi MQ1N4732GTR may be considered, but strict electrical parameter verification against the original 4.7V specification is required.

FAQ

Is this component authorized for use in life support devices?

No. Diodes Incorporated does not authorize these products for use as critical components in life support devices or systems without expressed written approval.

What is the maximum surge current rating for this diode?

The maximum surge current (8.3ms) rating for the 1N4732A is 970 mA.