1N5518

Overview

The Microchip Technology 1N5518 is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 3.3 V with a maximum power dissipation of 500 mW. The device operates within a junction temperature range of -65°C to +175°C and utilizes the DO-204AH (DO-35) axial through-hole package. Key electrical characteristics include a maximum reverse leakage current of 5 µA, a Zener impedance of 26 Ohms, and a forward voltage of 1.1 V at 200 mA.

Feature Summary

• Provides stable voltage regulation at a low 3.3 V reference level
• Capable of operation in extreme thermal environments up to 175°C
• Features low reverse leakage current for improved circuit efficiency

Applications

• Low voltage reference circuits
• Voltage clamping and protection
• General-purpose voltage regulation

Procurement Notes

Verify the specific tolerance variant required for the design, as standard versions may differ from precision A or B suffixes. Confirm the packaging format, such as bulk or tape and reel, matches assembly requirements. Ensure the DO-204AH footprint aligns with the PCB layout. Cross-reference datasheet parameters against the specific lot documentation to confirm compliance with intended operating conditions.

Selection Notes

Select this component when a robust 3.3 V reference is needed in high-temperature environments. The DO-35 package offers reliable through-hole mounting. Consider the 500 mW power rating for thermal management. Verify if tighter tolerance variants like 1N5518A are necessary for precision applications, as the base model typically carries wider tolerances.

Part Context

This component belongs to the widely recognized 1N55xx series of glass-passivated Zener diodes manufactured by Microchip Technology. The series covers a broad range of voltage values, providing a standardized solution for discrete voltage regulation tasks across various industrial and commercial electronic designs.