1N5521A/TR

Overview

The 1N5521A/TR is a single Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V with a tolerance of ±5%. The device operates in the DO-204AH (DO-35) axial through-hole package and dissipates up to 500 mW of power. Key electrical parameters include a maximum reverse leakage current of 3 µA at 1.5 V, a Zener impedance of 18 Ohms, and a forward voltage of 1.1 V at 200 mA. It supports a wide operating temperature range from -65°C to +175°C junction temperature.

Feature Summary

• Provides stable voltage regulation with a nominal 4.3 V Zener potential
• Capable of handling 500 mW power dissipation in an axial leaded package
• Engineered for reliable operation across extended industrial temperature ranges

Applications

• Voltage reference circuits requiring precise low-voltage stability
• Overvoltage protection stages in sensitive electronic systems
• Clamping applications in signal conditioning paths

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm exact tolerance and testing criteria. Ensure the procurement channel provides valid traceability for the DO-204AH reel packaging. Confirm compliance requirements such as REACH status prior to integration into final assemblies.

Selection Notes

Select this component when a 4.3 V regulation point is required within a 500 mW power budget. The DO-35 form factor suits automated through-hole assembly processes. Evaluate thermal management needs given the 175°C junction limit and ensure circuit design accommodates the specified 18 Ohm impedance characteristics.

Part Context

This part belongs to the standard 1N5521 series of Zener diodes produced by Microchip Technology. The /TR suffix indicates tape and reel packaging for automated manufacturing. It shares the same electrical profile as other variants in the series but differs in packaging format and potentially specific binning criteria defined by the manufacturer.

Replacement Considerations

Direct substitutes include 1N5521C/TR and 1N5521D/TR from Microchip Technology, which offer equivalent electrical specifications. Verify that any alternative maintains the DO-204AH package outline and 500 mW power rating for mechanical compatibility.