Molex 1111126421 SFP+ Connector Equivalent & Substitute Parts

Part Overview

The Molex 1111126421 is a Position Connector classified as an SFP+ 1X4 Cage with custom fin heat sink assembly. This pluggable connector component is designed for high-speed data interconnect applications requiring SFP+ cage functionality with integrated thermal management. The part is currently listed with Obsolete product status, necessitating identification of active equivalent alternatives to maintain design continuity and ensure ongoing component availability for production and field service applications.

Substiute Parts

1111126421

MolexIn Stock: 7871111126421 Datasheet

Current PartRFQ

1111128421

MolexIn Stock: 9091111128421 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Molex 1111126421 is based on alignment across the following critical parameters:

Functional Equivalence Criteria:

• Connector Category: Pluggable Connectors
• Connector Type: SFP+
• Cage Configuration: 1 x 4 (single row, four positions)
• Thermal Management: Heat sink integrated design
• Base Product Number: 111112 (same product family)

Compliance & Lifecycle Criteria:

• RoHS Compliance: Required for regulatory alignment
• Product Status: Active status preferred to ensure long-term availability
• Moisture Sensitivity Level: Compatibility with handling and storage requirements

The substitute part Molex 1111128421 shares the identical base product number (111112), connector type (SFP+), cage configuration (1 x 4 with heat sink), and RoHS compliance status, establishing direct functional and regulatory equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Molex 1111128421

The Molex 1111128421 is the direct functional equivalent for the obsolete 1111126421. Both components share the same base product number (111112), SFP+ connector type, and 1 x 4 cage configuration with integrated heat sink. The substitute part maintains RoHS compliance and is currently in Active product status, ensuring availability for new designs and field replacements.

The transition from the obsolete 1111126421 to the active 1111128421 is supported by:

• Identical connector family and functional classification
• Matching electrical and mechanical interface specifications for SFP+ cage applications
• Regulatory compliance continuity (RoHS Compliant status maintained)
• Active manufacturing and distribution status eliminating supply chain risk

Design integration of the 1111128421 requires confirmation that the specified mounting type (Through Hole, Right Angle), termination method (Press-Fit), and EMI shielding features align with the target application requirements.

Frequently Asked Questions (FAQ)

Q: Why is the Molex 1111126421 no longer available?

A: The 1111126421 has reached end-of-life status and is classified as Obsolete. Molex has transitioned this product line to the active 1111128421 variant, which provides equivalent SFP+ cage functionality with updated design specifications.

Q: Are the 1111126421 and 1111128421 electrically compatible?

A: Both components are SFP+ 1 x 4 cage connectors within the same base product family (111112). They share the same connector type and cage configuration, establishing electrical interface compatibility for SFP+ applications.

Q: What are the key differences between these parts?

A: The primary differences are product status (Obsolete vs. Active) and specified mechanical details. The 1111128421 includes documented mounting type (Through Hole, Right Angle), termination method (Press-Fit), and EMI shielding features. The original 1111126421 specifications do not include these details in the available documentation.

Q: Can I use the 1111128421 as a direct replacement in existing designs?

A: The 1111128421 is functionally equivalent for SFP+ cage applications. Confirmation is required that the Through Hole, Right Angle mounting orientation and Press-Fit termination method are compatible with the target PCB layout and assembly process.

Q: What is the inventory status for these parts?

A: The 1111126421 has 725 pieces in stock (Obsolete status). The 1111128421 has 802 pieces in stock and is actively manufactured, providing reliable long-term availability.

Q: Are both parts RoHS compliant?

A: Yes. The 1111126421 is RoHS Compliant. The 1111128421 is also RoHS Compliant, maintaining regulatory alignment for applications requiring RoHS certification.

Q: What does the MSL rating indicate?

A: Moisture Sensitivity Level (MSL) 1 indicates unlimited shelf life with no special moisture control requirements during storage and handling. The 1111128421 is rated as Not Applicable, indicating no moisture sensitivity constraints for this component type.