Molex 0050579021 Rectangular Connector Housing - Equivalent & Substitute Parts

Part Overview

The Molex 0050579021 is a 21-position rectangular connector receptacle housing designed for 0.100" (2.54mm) pitch applications. This component serves as the housing structure for female socket contacts in free-hanging, in-line configurations. The part is actively manufactured and widely used in industrial and commercial electronic assemblies where standardized rectangular connector interfaces are required. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and access to alternative sourcing options when the primary part becomes unavailable or when design requirements necessitate alternative connector series.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	21
Pitch	0.100" (2.54mm)
Number of Rows	1
Mounting Type	Free Hanging (In-Line)
Contact Termination	Crimp
Color	Black
Operating Temperature Range	-40°C to 105°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Molex 0050579021 are identified based on strict parametric equivalence across the following critical criteria:

Connector Configuration: Receptacle housing with female socket contacts
Position Count: Exactly 21 positions
Pitch Specification: 0.100" (2.54mm) center-to-center spacing
Row Configuration: Single row layout
Mounting Style: Free hanging, in-line orientation
Termination Method: Crimp-style contact attachment
Housing Color: Black
Thermal Range: -40°C to 105°C minimum operating envelope
Moisture Classification: MSL 1 or equivalent

Parts meeting all these parameters are classified as direct parametric equivalents and may be substituted in applications where the original part number is specified, provided that series-specific mechanical or electrical characteristics do not impose additional design constraints.

Parameter Comparison

Parameter	Molex 0050579021	Amphenol ICC (FCI) 65039-016LF	Equivalence Status
Manufacturer	Molex	Amphenol ICC (FCI)	Different Manufacturer
Connector Type	Receptacle	Receptacle	Equivalent
Contact Type	Female Socket	Female Socket	Equivalent
Number of Positions	21	21	Equivalent
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	Equivalent
Number of Rows	1	1	Equivalent
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Equivalent
Contact Termination	Crimp	Crimp	Equivalent
Color	Black	Black	Equivalent
Operating Temperature	-40°C to 105°C	-40°C to 105°C	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Insulation Material	Polyester, Glass Filled	Polyphenylene, Modified	Different Material
RoHS Status	ROHS3 Compliant	RoHS Compliant	Compliant
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Product Status	Active	Active	Both Active

Engineering Selection Recommendations

The Amphenol ICC (FCI) 65039-016LF is a parametrically equivalent substitute for the Molex 0050579021 based on matching electrical and mechanical specifications across all critical connector parameters. Both parts are actively manufactured, RoHS compliant, and REACH unaffected, ensuring regulatory compliance in current production environments.

The primary difference between these parts is the insulation material composition: the Molex part uses polyester with glass reinforcement, while the Amphenol ICC part uses modified polyphenylene. Both materials meet the specified operating temperature range of -40°C to 105°C and maintain MSL 1 classification. Material selection should be evaluated based on specific application requirements regarding chemical resistance, mechanical stress, and environmental exposure.

Both parts are supplied as housings without contacts included, requiring separate procurement of compatible crimp contacts for the 0.100" (2.54mm) pitch specification. Substitution is appropriate for applications where connector series flexibility is acceptable and where the modified polyphenylene insulation material is compatible with the intended operating environment.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol ICC 65039-016LF be used as a direct replacement for the Molex 0050579021?

A: Yes, the Amphenol ICC 65039-016LF meets all parametric equivalence criteria for the Molex 0050579021, including position count, pitch, mounting style, and operating temperature range. Both are 21-position receptacle housings with 0.100" (2.54mm) pitch and crimp termination. Substitution is valid provided that the application does not impose series-specific mechanical constraints.

Q: What is the difference in insulation material between these two parts?

A: The Molex 0050579021 uses polyester with glass reinforcement, while the Amphenol ICC 65039-016LF uses modified polyphenylene. Both materials support the -40°C to 105°C operating range and maintain MSL 1 classification. Material selection depends on application-specific requirements for chemical resistance and mechanical properties.

Q: Are contacts included with these connector housings?

A: No. Both the Molex 0050579021 and Amphenol ICC 65039-016LF are supplied as housings only. Crimp contacts compatible with 0.100" (2.54mm) pitch specifications must be procured separately and are not included with the housing.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both parts are RoHS compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the significance of MSL 1 classification for these parts?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life with no special moisture control requirements during storage or handling. Both parts can be stored and handled under standard warehouse conditions without desiccant packaging or environmental controls.

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