1N6638

Overview

The Microchip Technology 1N6638 is a small signal switching diode designed for through-hole mounting in D-2 packages. It features a peak reverse voltage of 125 V and an average forward current rating of 300 mA, with a maximum surge current capacity of 2.5 A. The device exhibits a fast reverse recovery time of 4.5 ns and a typical forward voltage of 1.1 V at rated current. Reverse leakage current is specified at 35 nA. Operating temperatures range from -65°C to +175°C junction temperature.

Feature Summary

• Hermetically sealed glass construction for high reliability
• Fast switching capability with 4.5 ns reverse recovery time
• Wide operating temperature range suitable for harsh environments
• Single element configuration for compact circuit integration

Applications

• Computer logic circuits requiring fast switching
• High-reliability military and aerospace systems
• Signal processing applications demanding low leakage
• Clamping and protection circuits in sensitive electronics

Procurement Notes

Verify the specific revision level and qualification status (such as JAN or JANTX) required for your application, as these variants may have different testing standards despite sharing the base part number. Confirm that the D-2 through-hole package aligns with your PCB layout constraints. Ensure compliance with MIL-PRF-19500 specifications if high-reliability performance is mandated for your system design.

Selection Notes

Select this component when fast switching speed and low reverse leakage are critical compared to general-purpose rectifiers. The 125 V reverse voltage rating suits moderate voltage applications where higher breakdown devices are unnecessary. Consider the thermal resistance and package size relative to available board space. Verify that the 300 mA current rating meets the peak load requirements of the target circuit without exceeding safe operating limits.

Part Context

This diode belongs to the industry-standard 1N series, widely recognized for its pinout compatibility across manufacturers. Microchip Technology produces this variant to meet military-grade reliability standards, often serving as a drop-in replacement for legacy designs in defense and industrial equipment. The hermetic seal distinguishes it from commercial equivalents by preventing moisture ingress and ensuring long-term stability under extreme conditions.

Replacement Considerations

Direct substitutes include other manufacturers' 1N6638 parts meeting identical electrical specifications. For surface-mount needs, verify equivalent performance in SOD packages. Always confirm that any replacement maintains the same hermetic sealing and qualification level if used in radiation-hardened or vacuum environments.