1N4955US/TR

Overview

The Microchip Technology 1N4955US/TR is a single silicon unidirectional Zener voltage regulator diode designed for surface-mount applications. It features a nominal Zener voltage of 7.5 V with a tolerance of ±5%. The device supports a maximum power dissipation of 5 W and operates within an extended temperature range from -65 °C to +175 °C. Key electrical characteristics include a test current of 175 mA, a maximum reverse leakage current of 100 µA, and a dynamic impedance of 1.5 Ohms. The component utilizes the D-5B-2 package.

Feature Summary

• Provides stable voltage regulation using a single silicon junction structure
• Engineered for high thermal stability across extreme operating temperatures
• Utilizes a hermetically sealed glass encapsulation for environmental protection

Applications

• High-reliability aerospace electronic circuits
• Military-grade voltage reference systems
• Harsh environment power supply regulation

Procurement Notes

Verify that the specific suffix /TR indicates tape-and-reel packaging configuration when sourcing. Confirm compliance requirements such as RoHS status, as military variants may differ from commercial standards. Ensure the supplier provides valid traceability documentation consistent with Microchip or Microsemi manufacturing records for quality assurance.

Selection Notes

Select this component when a 7.5 V regulation point is required in space-constrained surface-mount designs. The D-5B-2 package offers a compact footprint suitable for automated assembly processes. Consider the 5 W power rating and low dynamic impedance for applications demanding precise voltage control under varying load conditions.

Part Context

This part belongs to the 1N49xxUS series of high-power Zener diodes manufactured by Microchip Technology. The series encompasses various voltage ratings while maintaining consistent physical dimensions and performance characteristics. These components are widely utilized in critical infrastructure where long-term reliability and robustness are essential operational requirements.

Replacement Considerations

Direct substitutes include JAN1N4955US/TR and JANTXV1N4955US/TR. Verify pinout compatibility and ensure equivalent voltage and power specifications before implementation.