1N4903A/TR

Overview

The Microchip Technology 1N4903A/TR is a general-purpose silicon rectifier diode designed for high-voltage applications. It features a maximum repetitive peak reverse voltage of 200 volts and a continuous forward current rating of 1.0 ampere. The device utilizes a DO-41 axial leaded package, providing robust mechanical stability for through-hole mounting. Key electrical characteristics include a low forward voltage drop at rated current and fast switching capabilities suitable for various power supply and protection circuits.

Feature Summary

• High voltage blocking capability for reliable operation in demanding environments
• Robust axial leaded construction ensuring secure mechanical attachment
• Fast recovery characteristics optimized for efficient power conversion

Applications

• General purpose rectification in AC to DC power supplies
• Protection against reverse polarity in electronic circuits
• Freewheeling diodes in inductive load switching applications

Procurement Notes

Verify the specific suffix TR indicates tape and reel packaging when ordering. Confirm the manufacturer datasheet matches the required voltage and current ratings for your design. Ensure compatibility with standard through-hole assembly processes. Check for any regional compliance certifications required for your target market before finalizing procurement.

Selection Notes

Select this component when a 200V reverse voltage rating is sufficient for the circuit requirements. Consider the DO-41 package size constraints during PCB layout planning. Evaluate thermal management needs based on the expected forward current and ambient temperature conditions. Compare performance metrics against alternative diodes if higher speed or lower capacitance is critical.

Part Context

This part belongs to the standard 1N49xx series of silicon rectifiers widely used in industrial and consumer electronics. The 1N4903 variant specifically addresses mid-range voltage applications requiring reliable unidirectional current flow. Its long-standing availability makes it a common choice for legacy designs and cost-sensitive production runs.

Replacement Considerations

Equivalent parts include the 1N4003 and 1N5393, which share similar electrical specifications. Verify pinout compatibility and physical dimensions before substitution. Ensure replacement components meet the same safety and regulatory standards as the original specification.