71-433338-21P

Overview

The Amphenol Aerospace Operations model 71-433338-21P is a circular MIL-spec connector plug designed for ruggedized interconnect applications. It complies with the MIL-DTL-38999 Series III standard, ensuring compatibility with established military and aerospace interfaces. The component features a size 21 shell constructed from aluminum alloy, providing structural integrity in demanding environments. It utilizes a crimp termination method for secure wire attachment and includes silver-plated contacts to maintain signal integrity. The unit is configured with 21 positions using socket-type contacts, facilitating reliable mating with corresponding pin plugs.

Feature Summary

• Complies with MIL-DTL-38999 Series III specifications for high-reliability performance
• Features a threaded coupling mechanism for secure connection retention
• Constructed with an aluminum alloy shell for durability and weight efficiency
• Utilizes silver-plated copper alloy contacts for consistent electrical conductivity

Applications

• Avionics systems in military aircraft and helicopters
• Naval shipboard communication and radar equipment
• Ground vehicle electronic control units
• Portable soldier-worn tactical communication gear

Procurement Notes

Verify that the specific ordering suffix matches the required contact plating and environmental sealing options. Confirm that the crimp tooling aligns with the specified contact sizes. Ensure the procurement channel provides traceable documentation for MIL-DTL-38999 compliance. Check for any restricted material listings or export control classifications associated with this specific part number before finalizing orders.

Selection Notes

Select this component when a Series III interface is required for space-constrained installations. Evaluate the need for silver versus gold plating based on the operating environment's corrosion risks and signal frequency requirements. Consider the straight cable entry style against available routing space. Verify that the 21-position count meets the circuit density needs without requiring larger shell sizes.

Part Context

This part belongs to the extensive family of Amphenol MIL-DTL-38999 connectors, which have served as the industry standard for circular interconnects for decades. The Series III designation indicates a compact form factor compared to earlier generations, allowing for higher pin counts within smaller diameters. This specific model represents a standard configuration widely used across defense platforms.

Replacement Considerations

Compatible substitutes include equivalent parts from other manufacturers adhering strictly to MIL-DTL-38999 Series III dimensions and electrical characteristics. Cross-reference part numbers such as those from LEMO or ITT Cannon that share the same shell size and contact arrangement. Ensure mechanical interchangeability is verified before adoption.