MS3111E8-4P Equivalent & Substitute Parts

Part Overview

The MS3111E8-4P is a 4-position circular connector receptacle manufactured by ITT Cannon, LLC, designed for cable-mount applications in military and aerospace environments. This connector features male pins with solder cup termination, bayonet lock fastening, and aluminum alloy construction with olive drab cadmium finish. The part is currently active in production with 709 units in stock.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and environmental ratings can be maintained across different manufacturers while preserving the core functional requirements of the application.

Substiute Parts

MS3111E8-4P

ITT Cannon, LLCIn Stock: 792MS3111E8-4P Datasheet

Current PartRFQ

MSW01E8-4P

Milspecwest, LLCIn Stock: 927MSW01E8-4P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The MSW01E8-4P from Milspecwest, LLC qualifies as a substitute for the MS3111E8-4P based on the following alignment of critical parameters:

Electrical Compatibility:

• Identical 4-position configuration
• Matching shell size designation (8-4)
• Equivalent current rating (7.5A)
• Compatible voltage rating (800V exceeds the 600VAC/850VDC requirement)
• Identical operating temperature range (-55°C to 125°C)

Mechanical Compatibility:

• Receptacle connector type with male pins
• Free hanging (in-line) cable mount configuration
• Bayonet lock fastening mechanism
• Aluminum shell construction
• Solder termination method

Environmental Specifications:

• Environment resistant ingress protection classification
• Military application designation
• Non-compliant RoHS status (matching compliance profile)

Parameter Comparison

Engineering Selection Recommendations

Both the MS3111E8-4P and MSW01E8-4P are active production parts with established military application histories. Selection between these parts should be based on:

Availability and Lead Time: The MSW01E8-4P currently has 855 units in stock compared to 709 units for the MS3111E8-4P, providing an alternative source for procurement continuity.

Compliance Profile: Both parts maintain identical RoHS non-compliant status and EAR99 export classification, ensuring regulatory consistency in applications requiring these specifications.

Termination Method: The MS3111E8-4P specifies solder cup termination, while the MSW01E8-4P uses standard solder termination. Both methods are compatible with the electrical and mechanical requirements of the 4-position, 7.5A circuit configuration.

Contact Finish: The MS3111E8-4P provides gold mating contact finish (50.0µin thickness), while the MSW01E8-4P uses cadmium contact finish. This difference may influence corrosion resistance characteristics in specific environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the MSW01E8-4P directly replace the MS3111E8-4P in existing assemblies?

A: Yes, the MSW01E8-4P is mechanically and electrically compatible. Both connectors share identical shell size (8-4), position count (4), fastening mechanism (bayonet lock), and electrical ratings (7.5A, operating temperature -55°C to 125°C). The primary difference is the contact finish material, which does not affect mechanical fit or basic electrical function.

Q: What is the significance of the shell size designation 8-4?

A: The 8-4 designation indicates shell size 8 with a 4-position insert. This standardized notation ensures mechanical compatibility between receptacles and plugs from different manufacturers within the same size class, provided other parameters (fastening type, pin configuration) align.

Q: Are there differences in solder cup versus standard solder termination?

A: Solder cup termination provides a recessed cup geometry for wire insertion, while standard solder termination uses a flat or slightly contoured surface. Both methods accommodate solder attachment of conductors. The choice depends on assembly equipment and process specifications.

Q: How do the contact finish materials affect performance?

A: Gold plating (MS3111E8-4P) provides superior corrosion resistance and lower contact resistance over extended service life. Cadmium plating (MSW01E8-4P) offers adequate protection for military applications but may show increased oxidation in high-humidity or corrosive environments. Both finishes meet the specified operating temperature range and voltage ratings.

Q: What does the bayonet lock fastening type ensure?

A: Bayonet lock fastening provides positive mechanical engagement between mating connector halves through a quarter-turn rotational coupling. This mechanism ensures vibration-resistant connections suitable for aerospace and military applications subject to mechanical shock and vibration.

Q: Are both parts suitable for the same environmental conditions?

A: Yes, both the MS3111E8-4P and MSW01E8-4P are rated for environment-resistant ingress protection and operate across the identical temperature range (-55°C to 125°C). Both are designated for military applications and maintain equivalent environmental sealing characteristics.