1N5819

Overview

The Microchip Technology 1N5819 is a discontinued axial power Schottky rectifier designed for low voltage and high frequency applications. It features a 40 V repetitive reverse voltage rating and a 1 A average forward current capability in a DO-41 package. The device exhibits very small conduction losses, negligible switching losses, and extremely fast switching speeds with a low forward voltage drop. It includes specified avalanche capability and is suitable for use in switch mode power supplies, high frequency DC to DC converters, free wheeling circuits, polarity protection, and small battery chargers.

Feature Summary

• Extremely fast switching speed with negligible switching losses
• Low forward voltage drop resulting in very small conduction losses
• Specified avalanche capability for enhanced robustness

Applications

• Switch Mode Power Supplies
• High frequency DC to DC converters
• Free wheeling circuits
• Polarity protection
• Small battery chargers

Procurement Notes

This component is officially listed as obsolete by the manufacturer. Procurement must rely on secondary market distributors or surplus inventory channels. Verify the authenticity of the source and inspect the physical condition of the DO-41 package before integration. Confirm that the specific lot date code meets project requirements, as availability is limited and supply chain continuity cannot be guaranteed through standard manufacturing channels.

Selection Notes

Select this part only if the design specifically requires the legacy 1N5819 form factor and electrical characteristics within a DO-41 axial package. Due to its obsolete status, engineers should evaluate modern Schottky alternatives from Microchip or other manufacturers that offer RoHS compliance and active production support. Ensure that the replacement component matches the required 40 V reverse voltage and 1 A current ratings while fitting the existing PCB footprint constraints.

Part Context

The 1N5819 belongs to a widely recognized family of 1 Ampere Schottky barrier rectifiers historically used in general-purpose electronics. Microchip Technology (formerly Microsemi) manufactured this specific variant as an axial leaded device. While the standard 1N5819 designation is obsolete, related military-grade variants such as JAN1N5819-1 remain available for specialized applications requiring higher reliability standards and specific qualification certifications.

Replacement Considerations

Microchip offers the JAN1N5819-1 as a qualified substitute for military specifications. Other manufacturers provide equivalent 40V 1A Schottky diodes in DO-41 packages. Verify pinout compatibility and thermal performance when transitioning to active production parts.