1N4508

Overview

The Microchip Technology 1N4508 is a silicon power rectifier diode designed for high-current applications. It features a stud mount configuration within the DO-4 (DO-203AA) package, facilitating robust thermal management and secure mechanical attachment. The device supports a maximum repetitive peak reverse voltage of 600V and an average forward rectified current of 22A. It withstands a maximum non-repetitive peak forward surge current of 250A. The component operates reliably across a temperature range from -65°C to +200°C junction temperature.

Feature Summary

• Glass passivated die construction for enhanced stability
• Stud mount design for efficient heat dissipation
• High surge current capability for transient protection

Applications

• Industrial power supply circuits
• Battery charging systems
• DC motor drive rectification

Procurement Notes

Verify the manufacturer origin carefully, as the 1N4508 designation has been produced by multiple entities including Microsemi and Microchip Technology. Confirm that the specific unit received matches the required package style and terminal configuration. Ensure compliance with any applicable environmental regulations if RoHS status is critical, noting that some variants may be classified as non-RoHS. Cross-reference datasheets to confirm exact electrical limits before integration.

Selection Notes

Select this component when a rugged, stud-mounted rectifier is required for high-power DC conversion. The 22A continuous current rating suits moderate to heavy loads where heatsinking via chassis mounting is feasible. Consider the 600V reverse voltage rating against circuit peak inverse voltages. Evaluate the physical dimensions of the DO-4 package to ensure compatibility with existing board layouts or panel cutouts.

Part Context

This part belongs to the standard recovery silicon power rectifier family. Historically associated with Microsemi Corporation, production rights and documentation are now managed under Microchip Technology. These devices are characterized by glass-to-metal seal construction, offering durability in harsh environments compared to plastic-encapsulated alternatives.

Replacement Considerations

Direct substitutes include other 1N4xxx series diodes with matching 22A and 600V ratings. Verify pinout and mounting hole patterns when replacing with generic equivalents. Ensure thermal resistance characteristics are comparable to maintain junction temperature limits.