1N5518D

Overview

The Microchip Technology 1N5518D is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 3.3 V with a tight tolerance of ±1%. The device operates in a through-hole DO-204AH (DO-35) axial package and dissipates up to 500 mW. Key electrical parameters include a maximum reverse leakage current of 5 µA, a Zener impedance of 26 Ohms at a test current of 20 mA, and a forward voltage of 1.1 V at 200 mA. It supports an operating temperature range from -65°C to +175°C.

Feature Summary

• Provides precise voltage regulation with ±1% tolerance for sensitive circuitry
• Engineered for low reverse leakage current to minimize power loss
• Capable of high-temperature operation up to 175°C junction temperature

Applications

• Precision voltage reference circuits
• Overvoltage protection stages
• Clamping applications in signal processing

Procurement Notes

Verify the specific suffix 'D' indicates ±1% tolerance against standard variants. Confirm RoHS compliance status as some listings indicate non-compliance. Ensure the DO-204AH package dimensions match the target PCB footprint. Check for lead-free availability if required by assembly standards.

Selection Notes

Select this component when tight voltage accuracy is critical compared to standard 5% or 10% tolerance devices. The 500 mW power rating suits moderate current loads. Consider the 26 Ohm impedance for noise-sensitive designs. Ensure the 3.3 V breakdown voltage aligns with the system's regulatory requirements.

Part Context

This part belongs to the 1N5518B series family, distinguished by its tighter manufacturing tolerance. While the 1N5518B offers 5% tolerance, the 1N5518D provides enhanced precision. Both share similar thermal and mechanical characteristics within the DO-35 glass axial package format.

Replacement Considerations

• 1N5518D/TR