1N5521

Overview

The Microchip Technology 1N5521 is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V and operates with a test current of 20 mA. The device exhibits a Zener impedance of 18 Ohms, ensuring stable performance under specified conditions. Packaged in the DO-35 axial through-hole format, it supports surface or board mounting via standard leaded techniques. This component serves as a reliable voltage reference element within electronic circuits requiring precise potential control.

Feature Summary

• Provides stable voltage regulation at a fixed 4.3 V reference level
• Utilizes an axial DO-35 package for traditional through-hole integration
• Maintains low Zener impedance to support consistent voltage stability

Applications

• Voltage reference circuits
• Overvoltage protection stages
• Biasing networks for semiconductor devices

Procurement Notes

Verify the specific suffix designation when ordering, as variations such as TR indicate tape-and-reel packaging while standard designations imply bulk supply. Confirm compliance requirements against project specifications, noting that certain variants may not meet RoHS standards. Cross-reference manufacturer datasheets to ensure electrical parameters align with circuit design constraints before finalizing procurement decisions.

Selection Notes

Select this component when a 4.3 V Zener reference is required in a compact axial package. Evaluate the 18 Ohm impedance value against load regulation needs. Ensure the operating temperature range covers the intended environmental conditions. Compare power dissipation limits with expected current levels to prevent thermal issues during continuous operation.

Part Context

This part belongs to the standard Zener diode family manufactured by Microchip Technology. It shares functional similarities with other axial-lead regulators but is distinguished by its specific 4.3 V breakdown voltage. The DO-35 housing provides mechanical robustness suitable for general-purpose electronics assembly and industrial control systems.

Replacement Considerations

Substitute parts must match the 4.3 V Zener voltage and DO-35 form factor. Verify equivalent impedance and power ratings to maintain circuit integrity. Check for pinout compatibility and thermal characteristics to ensure seamless integration without redesigning surrounding components.