Molex 0791077256 Rectangular Connector - Equivalent & Substitute Parts

Part Overview

The Molex 0791077256 is a 14-position receptacle connector from the Milli-Grid 79107 series, designed for board-to-board or cable applications. This through-hole mounted connector features a 0.079" (2.00mm) pitch with gold-plated mating contacts and tin-plated posts. The connector is actively produced and maintains full inventory availability. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements necessitate alternative specifications within compatible electrical and mechanical parameters.

Substiute Parts

0791077256

MolexIn Stock: 9590791077256 Datasheet

Current PartRFQ

M22-7140742

Harwin Inc.In Stock: 2696M22-7140742 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for rectangular connectors is determined by strict alignment of core mechanical and electrical parameters. The following criteria establish compatibility:

Critical Parameters (Must Match):

• Connector type: Receptacle
• Number of positions: 14
• Pitch - mating: 0.079" (2.00mm)
• Number of rows: 2
• Row spacing - mating: 0.079" (2.00mm)
• Mounting type: Through hole
• Termination: Solder
• Contact finish - mating: Gold

Allowable Variations:

• Current rating: May exceed the primary part specification
• Voltage rating: May exceed the primary part specification
• Operating temperature range: May be narrower or wider
• Insulation material composition
• Contact post length and finish thickness
• Insulation height within mechanical tolerance
• Mated stacking heights

The substitute part M22-7140742 maintains all critical parameters while providing enhanced electrical ratings and alternative material specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the Molex 0791077256 and Harwin M22-7140742 are active products with ROHS3 compliance and REACH unaffected status. The Harwin substitute provides enhanced electrical performance with doubled current rating (2A versus 1A) and significantly higher voltage rating (500VAC versus 125V). The Harwin connector features Liquid Crystal Polymer insulation material compared to the glass-filled thermoplastic of the Molex part, offering improved material properties. The contact post length differs by 0.019" (0.49mm), which may require PCB layout verification. Operating temperature range is narrower on the Harwin part (-40°C to 105°C versus -55°C to 125°C). Selection between these parts should be based on specific application voltage and current requirements, operating temperature constraints, and PCB design compatibility.

Frequently Asked Questions (FAQ)

Q: Can the Harwin M22-7140742 be used as a direct replacement for the Molex 0791077256?

A: The Harwin M22-7140742 maintains all critical mechanical and electrical interface parameters, including pitch, row spacing, number of positions, and contact finish. However, the contact post length differs by 0.019" (0.49mm), requiring verification of PCB hole depth and solder joint geometry. Operating temperature range is narrower on the Harwin part.

Q: What are the key differences in electrical ratings?

A: The Harwin substitute provides enhanced ratings: 2A current capacity versus 1A, and 500VAC voltage rating versus 125V. These higher ratings make the Harwin part suitable for applications requiring greater electrical capacity.

Q: Are there material differences between these connectors?

A: Yes. The Molex part uses glass-filled thermoplastic insulation, while the Harwin part uses Liquid Crystal Polymer (LCP). Both materials are suitable for their respective applications, with LCP offering enhanced material properties.

Q: What is the significance of the insulation height difference?

A: The insulation height differs by 0.002" (0.05mm), which is within typical mechanical tolerance. This minimal difference should not affect mechanical fit in standard applications.

Q: Are both parts compliant with current regulations?

A: Yes. Both the Molex 0791077256 and Harwin M22-7140742 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What packaging is available for the substitute part?

A: The Harwin M22-7140742 is supplied in tube packaging, with 2677 pieces available in current inventory.