1N5518A

Overview

The Microchip Technology 1N5518A is a low voltage avalanche Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 3.3 V with a standard tolerance of ±5%. The device operates in the DO-35 axial leaded glass package and dissipates up to 500 mW of power. Key electrical parameters include a maximum reverse leakage current of 5 µA, a Zener impedance of 26 Ω at a test current of 20 mA, and a forward voltage of 1.1 V. It supports an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Provides stable voltage regulation using low voltage avalanche characteristics
• Features low reverse leakage current for improved circuit efficiency
• Constructed with hermetically sealed glass DO-35 package for durability

Applications

• Voltage reference circuits requiring precise low voltage regulation
• Protection against overvoltage transients in sensitive electronics
• Temperature compensated biasing networks

Procurement Notes

Verify the specific suffix (e.g., A, B, E3) to ensure correct tolerance and compliance status. Confirm package type matches design requirements. Check manufacturer documentation for latest RoHS and environmental declarations. Validate supply chain authenticity through authorized channels. Review datasheet for handling and storage guidelines.

Selection Notes

Select this component when a 3.3 V reference with ±5% tolerance is required. Ensure the 500 mW power rating suits the thermal environment. Verify that the axial DO-35 package fits the PCB layout constraints. Consider the high operating temperature limit for harsh environments. Compare leakage specifications against other low-voltage options.

Part Context

This part belongs to the 1N5518B/1N5546B series of low voltage avalanche Zener diodes manufactured by Microchip Technology. These components are widely used in industrial and commercial applications where reliable voltage regulation is critical. The series offers various voltage values within the low voltage range, packaged in standard axial leaded configurations.

Replacement Considerations

Direct substitutes include parts from other manufacturers offering identical 3.3 V Zener voltage, 500 mW power rating, and DO-35 package. Verify pinout compatibility and electrical parameter tolerances before substitution.