1N6638U

Overview

The Microchip Technology 1N6638U is a small signal switching diode designed for surface mount applications. It features a maximum repetitive peak reverse voltage of 125V and an average forward rectified current rating of 300mA. The component utilizes a D-5D package, also identified as SQ SMT, which provides a non-cavity glass construction with metallurgical sealing. This device is classified as a signal or computer diode suitable for high-speed switching operations within electronic circuits.

Feature Summary

• Non-cavity glass package construction
• Metallurgically sealed design
• Surface mount form factor

Applications

• Signal switching circuits
• Computer logic interfaces
• High-speed rectification tasks

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as JAN or JANS indicate different qualification levels under MIL-PRF-19500/578. Confirm RoHS compliance status directly with the manufacturer, as standard commercial versions may differ from military-grade equivalents. Ensure the D-5D package footprint matches the target PCB layout requirements before finalizing procurement specifications.

Selection Notes

Select this component when a robust surface mount switching diode with moderate voltage blocking capabilities is required. The 125V reverse voltage rating suits low-voltage digital systems. Consider the D-5D package constraints for board space. Evaluate thermal management needs against the 300mA forward current limit to ensure reliable operation in the intended environment without exceeding junction temperature ratings.

Part Context

This part belongs to the broader family of switching diodes manufactured by Microchip Technology, formerly Microsemi. The 1N6638U shares characteristics with related models like the 1N6642U and 1N6643U, often available in various qualification grades including JAN, JANTX, and JANS. These devices are typically governed by the MIL-PRF-19500/578 specification for performance consistency.

Replacement Considerations

Direct substitutes include the JAN1N6638U and JANS1N6638U variants, which share identical electrical parameters but differ in qualification standards. Cross-referencing with other manufacturers requires verifying the D-5D package dimensions and ensuring the replacement meets the 125V and 300mA ratings.