Molex 0757571321 Rectangular Connector - Equivalent & Substitute Parts

Part Overview

The Molex 0757571321 is a vertical header connector with 4 positions and 4.6mm pitch, designed for through-hole board-to-cable/wire applications in automotive environments. This connector features a breakaway header design with unshrouded configuration and push-pull fastening. The part is currently obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

0757571321

MolexIn Stock: 11620757571321 Datasheet

Current PartRFQ

0757571221

MolexIn Stock: 51020757571221 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0757571321 is determined by strict equivalence across the following critical parameters:

• Connector Type: Header, Breakaway configuration
• Number of Positions: 4 positions
• Number of Rows: 2 rows
• Pitch - Mating: 0.138" (4.60mm)
• Row Spacing - Mating: 0.236" (6.00mm)
• Contact Type: Male Blade
• Mounting Type: Through Hole
• Termination: Solder
• Fastening Type: Push-Pull
• Insulation Material: Liquid Crystal Polymer (LCP), Glass Filled
• Material Flammability Rating: UL94 V-0

The substitute part Molex 0757571221 maintains full electrical and mechanical compatibility with the original part across all specified parameters. The primary distinction is product status: the original part is obsolete while the substitute is active in production with higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The Molex 0757571221 is a direct functional equivalent to the obsolete Molex 0757571321. Both parts are manufactured by Molex within the same MX150 75757 series and maintain identical electrical and mechanical specifications across all critical parameters.

Selection of the substitute part 0757571221 is supported by:

• Active product status ensuring long-term availability and supply chain continuity
• Significantly higher inventory levels (5061 units versus 1071 units)
• Full compliance with ROHS3 and REACH requirements
• Identical UL94 V-0 flammability rating
• Equivalent contact finish specifications and materials
• Same through-hole mounting and push-pull fastening configuration
• Identical pitch and row spacing for direct PCB layout compatibility

The substitute part is suitable for both new designs and replacement applications requiring the Molex 0757571321 specification.

Frequently Asked Questions (FAQ)

Q: Can the Molex 0757571221 be used as a direct replacement for the 0757571321?

A: Yes. Both parts are electrically and mechanically equivalent across all specified parameters including connector type, position count, pitch, row spacing, contact configuration, and termination method. The primary difference is product status and packaging.

Q: What is the difference between these two part numbers?

A: The 0757571321 is obsolete while the 0757571221 is active in production. The substitute part features higher inventory availability and is packaged in tubes. All functional specifications remain identical.

Q: Are the contact finish specifications the same?

A: The mating contact finish is gold on both parts. The contact finish thickness differs slightly: the original part specifies 29.5µin (0.75µm) while the substitute specifies 2.00µin (0.051µm). Both parts maintain tin finish on the post with 100.0µin (2.54µm) thickness. The post finish is identical.

Q: Will the substitute part fit the same PCB layout?

A: Yes. Both parts share identical pitch (0.138" / 4.60mm), row spacing (0.236" / 6.00mm), and all contact dimensions. PCB footprints designed for the 0757571321 are directly compatible with the 0757571221.

Q: Are both parts compliant with automotive standards?

A: Both parts are rated for automotive applications and maintain ROHS3 compliance and REACH unaffected status. Both carry UL94 V-0 flammability rating and MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the packaging difference?

A: The original part 0757571321 does not specify packaging format. The substitute part 0757571221 is supplied in tube packaging, which is standard for production quantities.