1N4957US/TR

Overview

The 1N4957US/TR is a surface-mount Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 9.1 V with a 5% tolerance and a maximum reverse leakage current of 25 uA. The device operates in the D-5B-2 package, supporting a power dissipation of 5 W at a test current of 150 mA. It includes a Zener impedance of 22 Ohms and is supplied in tape-and-reel packaging for automated assembly.

Feature Summary

• Surface-mount construction in a compact D-5B-2 package
• High power dissipation capability of 5 W
• Tape-and-reel delivery format for SMT processes

Applications

• Voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation

Procurement Notes

Verify the specific suffix 'TR' to confirm tape-and-reel packaging requirements against your assembly line specifications. Ensure the D-5B-2 footprint matches your PCB design. Confirm that the 5 W power rating aligns with your thermal management strategy under expected operating conditions.

Selection Notes

Select this component when a 9.1 V reference is required in a high-power surface-mount application. The 5 W dissipation rating distinguishes it from lower-power variants. Verify that the 22 Ohm impedance meets the noise and stability requirements of the target circuit design.

Part Context

This part belongs to the 1N495x series of Zener diodes produced by Microchip Technology. It shares the same electrical characteristics as the JAN1N4957CUS but differs in packaging and compliance status. The US suffix indicates a specific manufacturing variant within the broader 1N495x family.

Replacement Considerations

JAN1N4957CUS offers identical electrical parameters but uses bulk packaging instead of tape-and-reel.