Molex 0351550404 Rectangular Connector Housing - Equivalent & Substitute Parts

Part Overview

The Molex 0351550404 is a 4-position rectangular connector housing with 2.50mm pitch, designed for crimp termination in free-hanging inline applications. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The housing accommodates female socket contacts and features a latch lock fastening mechanism. Substitute parts must maintain identical electrical and mechanical specifications to ensure direct interchangeability in existing assemblies.

Key Parameters

Parameter	Specification
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	4
Pitch	0.098" (2.50mm)
Number of Rows	1
Mounting Type	Free Hanging (In-Line)
Contact Termination	Crimp
Fastening Type	Latch Lock
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0351550404 is determined by strict adherence to the following parameters:

Connector Type & Contact Configuration: Must be receptacle housing with female socket contacts
Position Count & Pitch: Must maintain 4 positions at 0.098" (2.50mm) pitch
Mounting & Termination: Must support free-hanging inline mounting with crimp termination
Fastening Mechanism: Must feature latch lock fastening
Compliance: Must maintain ROHS3 compliance and MSL 1 rating

All identified substitute parts meet these core electrical and mechanical requirements. Variations in color, insulation material, and packaging do not affect functional interchangeability in the connector housing application.

Parameter Comparison

Parameter	0351550404 (Main)	0351550400	MX19004S51	0511030400	2078410004
Manufacturer	Molex	Molex	JAE Electronics	Molex	Molex
Connector Type	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket	Female Socket	Female Socket	Female Socket
Number of Positions	4	4	4	4	4
Pitch	0.098" (2.50mm)	0.098" (2.50mm)	0.098" (2.50mm)	0.098" (2.50mm)	0.098" (2.50mm)
Number of Rows	1	1	1	1	1
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)
Contact Termination	Crimp	Crimp	Crimp	Crimp	Crimp
Fastening Type	Latch Lock	Latch Lock	Latch Lock	Latch Lock	Latch Lock
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute: Molex 0351550400

The Molex 0351550400 is the direct parametric equivalent and recommended primary substitute. It maintains identical electrical and mechanical specifications to the 0351550404 while offering active product status with significantly higher inventory availability (97,748 units). Both parts share the same series designation (35155) and base product number (035155), ensuring design continuity. The only difference is housing color (natural vs. blue) and packaging format (bulk vs. original packaging), neither of which affects functional performance.

Secondary Substitutes: 0511030400 and 2078410004

Both Molex parts 0511030400 (Mini-Lock 51103 series) and 2078410004 (L1NK 250 series) meet all core electrical and mechanical requirements. These parts are suitable for applications where the primary substitute is unavailable. Part 0511030400 offers the highest inventory level (150,116 units) among all substitutes. Part 2078410004 uses polyamide insulation material (PA66, Nylon 6/6) versus polybutylene terephthalate (PBT) in other options, but maintains equivalent performance within specified operating temperature ranges (-40°C to 105°C).

Alternative Substitute: JAE Electronics MX19004S51

The JAE Electronics MX19004S51 provides cross-manufacturer equivalence with identical connector specifications. This part is suitable for applications requiring multi-source qualification. It includes waterproof features not present in Molex alternatives. Operating temperature specification is not provided for this part.

Frequently Asked Questions (FAQ)

Q: Can the Molex 0351550400 directly replace the 0351550404 in existing assemblies?

A: Yes. Both parts are parametrically equivalent with identical connector type, position count, pitch, mounting configuration, and termination method. The housing color difference (natural vs. blue) does not affect electrical or mechanical performance.

Q: What is the primary reason for substitution?

A: The Molex 0351550404 is classified as obsolete. Active substitute parts ensure continued availability for maintenance, repair, and new production requirements.

Q: Are there differences in insulation material among the substitute parts?

A: Yes. Most substitutes use polybutylene terephthalate (PBT), while the Molex 2078410004 uses polyamide (PA66, Nylon 6/6). Both materials are suitable for the specified operating temperature range (-40°C to 105°C) and do not affect connector housing interchangeability.

Q: Does the packaging format affect part compatibility?

A: No. Packaging differences (bulk, bag, or original) do not affect the connector housing functionality or interchangeability. Packaging selection is based on inventory management and procurement requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity level) rating, matching the original part's regulatory status.

Q: Can the JAE Electronics MX19004S51 be used in applications originally designed for Molex parts?

A: Yes. The MX19004S51 meets all core electrical and mechanical specifications. Cross-manufacturer substitution is suitable for applications where multi-source qualification is acceptable.

Q: What inventory considerations should guide substitute selection?

A: The Molex 0351550400 offers the highest availability among Molex options (97,748 units). The Molex 0511030400 provides the highest overall inventory (150,116 units). Selection should be based on procurement lead time requirements and supply chain strategy.

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