1N5521B/TR

Overview

The Microchip Technology 1N5521B/TR is a single Zener diode 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. Key electrical parameters include a maximum reverse leakage current of 5 µA at 2 V, a Zener impedance of 18 Ohms, and a forward voltage of 1.1 V at 200 mA. It supports a test current of 20 mA and functions within a junction temperature range of -65°C to +175°C.

Feature Summary

• Provides stable voltage regulation via Zener breakdown characteristics
• Capable of handling high thermal loads with extended operating temperatures
• Offers low leakage current for efficient circuit performance

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in electronic systems
• Clamping applications for signal conditioning

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm packaging and tolerance variations. Ensure the procurement channel provides valid traceability for the component's manufacturing origin. Confirm that the received parts match the specified DO-204AH package dimensions and lead finish requirements before integration into production assemblies.

Selection Notes

Select this component when a 4.3 V regulation point is required with moderate power dissipation capabilities. The axial through-hole format facilitates manual assembly or wave soldering processes. Consider the ±5% tolerance and 18 Ohm impedance specifications to ensure compatibility with the target circuit's sensitivity and load requirements.

Part Context

This part belongs to the standard Zener diode family manufactured by Microchip Technology. It utilizes the legacy DO-204AH axial package, which is widely supported in through-hole PCB layouts. The device serves as a fundamental discrete semiconductor component for basic voltage control tasks in industrial and commercial electronics.

Replacement Considerations

Consult official Microchip substitution guides for verified equivalents. Verify that any alternative part matches the 4.3 V Zener voltage, 500 mW power rating, and DO-204AH package form factor to maintain mechanical and electrical compatibility.