1N4738AE3/TR13

Overview

The Microchip Technology 1N4738AE3/TR13 is a single silicon Zener diode housed in an axial DO-41 package. It provides a nominal Zener voltage of 8.2 V with a tight tolerance of ±5%. The device dissipates up to 1 W of power and operates within a temperature range of -65 °C to +150 °C. Key electrical characteristics include a maximum reverse leakage current of 5 µA, a Zener impedance of 4.5 Ω, and a test current of 45 mA.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction
• Features hermetic sealing for reliable performance in harsh environments
• Utilizes an axial glass encapsulation for robust mechanical mounting

Applications

• Military aerospace electronic systems requiring high reliability
• Spacecraft power supply voltage reference circuits
• Avionics equipment demanding wide operating temperature stability

Procurement Notes

Verify the specific suffix 'TR13' indicates tape-and-reel packaging rather than bulk. Confirm the manufacturer designation as Microchip Technology or its predecessor Microsemi. Ensure the component meets military-grade specifications if required by the application environment. Cross-reference datasheets for exact thermal resistance values.

Selection Notes

Select this component when a precise 8.2 V reference is needed with strict tolerance requirements. The axial DO-41 form factor suits through-hole PCB layouts. Consider the 1 W power rating for heat dissipation needs. Verify compatibility with existing circuit designs regarding test current parameters.

Part Context

This part belongs to the 1N4738 series of Zener diodes, widely used in discrete voltage regulation. The 'E3' suffix denotes lead-free composition compliant with RoHS standards. The 'TR13' suffix specifies the reel quantity and packaging format for automated assembly processes.

Replacement Considerations

Compatible substitutes include the 1N4738A from other manufacturers such as onsemi. Ensure replacement parts match the 8.2 V nominal voltage and 1 W power dissipation limits. Verify that alternative packages maintain the same axial pin spacing for board compatibility.