1N3491R

Single Diodes Overview

The 1N3491R is a silicon power rectifier manufactured by Microchip Technology. It features a maximum repetitive reverse voltage of 50 V and an average forward rectified current rating of 25 A to 35 A, depending on specific datasheet revisions. The device utilizes a DO-218AA (DO-21) press-fit package designed for panel mounting. It operates within a junction temperature range of -65°C to +175°C and exhibits a non-repetitive peak surge current capability of up to 350 A.

Single Diodes Feature Summary

• High thermal stability with extended operating junction temperature range
• Robust mechanical design utilizing press-fit termination for secure panel mounting
• High surge current handling capability for transient protection

Single Diodes Applications

• General purpose power rectification in industrial equipment
• DC power supply input stages
• Battery charging circuits

Single Diodes Procurement Notes

Verify the specific manufacturer source, as historical production involved Motorola and Microsemi before acquisition by Microchip. Confirm the exact current rating (25A vs 35A) required for your thermal design, as legacy documentation varies. Ensure the DO-218AA footprint matches your panel cutout specifications for proper press-fit installation.

Single Diodes Selection Notes

Select this component when high current rectification at low voltage drop is required in space-constrained panel-mount applications. The DO-21 package eliminates traditional leads, reducing assembly height. Consider thermal management requirements given the high current density and ensure the mating connector supports the press-fit force specifications.

Single Diodes Part Context

This part belongs to the 1N3491 series of general-purpose silicon rectifiers. The 'R' suffix typically denotes the specific packaging or tape/reel configuration, though DO-21 parts are often bulk packed. The series includes variants with higher reverse voltage ratings such as the 1N3492 (100V).

Single Diodes Replacement Considerations

Direct substitutes include the 1N3491 from other manufacturers like Vishay or Littelfuse, provided they meet the 50V/25A+ specification and DO-218AA footprint. Verify pin compatibility and thermal resistance values before substitution.