1N5818/TR

Overview

The Microchip Technology 1N5818/TR is a silicon Schottky barrier rectifier designed for low voltage and high frequency applications. It features an axial DO-41 package with a maximum average forward rectified current of 1 A and a maximum repetitive peak reverse voltage ranging from 20 V to 40 V. The device exhibits a low forward voltage drop, typically 550 mV at 1 A, and negligible switching losses due to majority carrier conduction. It supports a peak forward surge current of 25 A and operates within a junction temperature range of -55°C to 150°C.

Feature Summary

• Metal silicon junction construction utilizing majority carrier conduction for extremely fast switching speeds.
• Guard ring design provides overvoltage protection and ensures high reliability under stress conditions.
• Low forward voltage drop minimizes conduction losses, enhancing overall system efficiency.
• Specified avalanche capability allows the device to withstand transient energy events.

Applications

• Switch Mode Power Supplies (SMPS)
• High frequency DC to DC converters
• Free wheeling diodes in inductive circuits
• Polarity protection circuits
• Small battery chargers

Procurement Notes

Verify the specific reverse voltage sub-type required, as the 1N5818 designation covers a range of 20 V to 40 V ratings. Confirm that the /TR suffix indicates tape and reel packaging if automated assembly is planned. Ensure compatibility with the DO-41 axial lead form factor for existing board layouts. Check for RoHS compliance status relevant to the manufacturing date code.

Selection Notes

Select this component when low forward voltage and fast recovery are critical for efficiency in power conversion stages. The 1 A current rating suits moderate power applications where thermal management is feasible without heatsinking. Consider the DO-41 package constraints for PCB space. Evaluate the specific voltage rating variant needed against the circuit's peak inverse voltage requirements.

Part Context

This part belongs to the standard 1N581x series of Schottky rectifiers produced by Microchip Technology. It serves as a direct replacement for legacy silicon Schottky diodes in industrial and consumer electronics. The DO-41 axial package ensures compatibility with through-hole mounting techniques widely used in established hardware designs.

Replacement Considerations

• 1N5818
• SR103