MS3111F20-39S Equivalent & Substitute Parts

Part Overview

The MS3111F20-39S is a 39-position circular connector receptacle manufactured by Amphenol Industrial Operations, designed for military and aerospace applications. This connector features female sockets with solder cup termination, bayonet lock fastening, and operates across the temperature range of -55°C to 125°C. The part is discontinued at DiGi Electronics, making identification of equivalent substitutes essential for ongoing system maintenance and new procurement requirements.

Key Parameters

Parameter	Value
Connector Type	Receptacle, Female Sockets
Number of Positions	39
Shell Size - Insert	20-39
Mounting Type	Free Hanging (In-Line)
Termination	Solder Cup
Fastening Type	Bayonet Lock
Shell Material	Aluminum
Operating Temperature	-55°C ~ 125°C
Series	MIL-DTL-26482 Series I
Ingress Protection	Environment Resistant

Substitute Part Grouping Explanation

The MSW01E20-39S-SR qualifies as a functional substitute based on the following critical parameters:

Connector Type Match: Both are receptacle connectors with female sockets
Position Count: Both feature 39 positions
Shell Size Compatibility: Both use shell size 20-39
Mounting Configuration: Both are free hanging (in-line) mount types
Fastening Method: Both employ bayonet lock fastening
Shell Material: Both utilize aluminum construction
Temperature Range: Both operate across -55°C to 125°C
Series Compliance: MSW01E20-39S-SR conforms to 26482 Style Connectors, maintaining MIL-DTL-26482 compatibility
Ingress Protection: Both provide environment resistant protection

The primary difference lies in termination method (solder cup versus solder) and contact finish specifications, which do not preclude functional substitution in applications where the connector interface requirements are met.

Parameter Comparison

Parameter	MS3111F20-39S (Main Part)	MSW01E20-39S-SR (Substitute)
Manufacturer	Amphenol Industrial Operations	Milspecwest, LLC
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	39	39
Shell Size - Insert	20-39	20-39
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)
Termination	Solder Cup	Solder
Fastening Type	Bayonet Lock	Bayonet Lock
Shell Material	Aluminum	Aluminum
Shell Finish	Olive Drab Chromate over Cadmium	Cadmium
Contact Finish - Mating	Gold	Cadmium
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Ingress Protection	Environment Resistant	Environment Resistant
Product Status	Discontinued at DiGi Electronics	Active
Inventory Availability	841 Pcs New Original In Stock	886 Pcs New Original In Stock

Engineering Selection Recommendations

The MS3111F20-39S is discontinued, necessitating transition to active alternatives. The MSW01E20-39S-SR maintains full mechanical and electrical interface compatibility through matching shell size, position count, mounting configuration, and fastening method.

Selection between these parts should be based on:

Product Status: MSW01E20-39S-SR is active and currently available, whereas MS3111F20-39S is discontinued
Compliance Requirements: MS3111F20-39S carries REACH Affected status; MSW01E20-39S-SR shows Vendor Undefined REACH status. Verify compliance requirements for your specific application
Contact Finish Specifications: MS3111F20-39S features gold mating contact finish; MSW01E20-39S-SR uses cadmium finish. Confirm contact material requirements for your circuit design
Termination Method: Both employ solder-based termination with compatible PCB integration methods
RoHS Compliance: MSW01E20-39S-SR is RoHS non-compliant; verify regulatory requirements for your end application

Frequently Asked Questions (FAQ)

Q: Can MSW01E20-39S-SR directly replace MS3111F20-39S in existing assemblies?

A: Yes, from a mechanical and interface perspective. Both connectors share identical shell size (20-39), position count (39), mounting type (free hanging), and fastening method (bayonet lock). Verify that contact finish specifications (gold versus cadmium) and compliance certifications meet your application requirements before implementation.

Q: What is the difference between solder cup and solder termination?

A: Solder cup termination features a cup-shaped contact designed for wire insertion and solder flow. Solder termination uses a standard solder joint interface. Both methods provide equivalent electrical connection when properly executed. Confirm your PCB design accommodates the specific termination geometry.

Q: Are these connectors interchangeable with other MIL-DTL-26482 Series I connectors?

A: Interchangeability is limited to connectors with matching shell size (20-39), position count (39), and fastening type (bayonet lock). The MIL-DTL-26482 standard encompasses multiple shell sizes and configurations. Verify all mechanical parameters before substitution.

Q: What is the inventory status for these parts?

A: MS3111F20-39S has 841 pieces available as new original stock but is discontinued. MSW01E20-39S-SR has 886 pieces available and maintains active product status with ongoing availability.

Q: How do the operating temperature ranges compare?

A: Both connectors operate identically across -55°C to 125°C, ensuring thermal compatibility in equivalent applications.

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