SS-668808-NF Modular Connector Equivalent & Substitute Parts

Part Overview

The SS-668808-NF is an active modular jack connector manufactured by Stewart Connector, designed for 8p8c (RJ45, Ethernet) applications. This through-hole, right-angle unshielded connector operates across -40°C to 85°C and meets Cat5 performance ratings. The connector features a board lock mechanism and gold-plated copper alloy contacts with 30.0µin finish thickness. Finding equivalent substitute parts is necessary to ensure supply chain flexibility, optimize inventory management, and maintain design compatibility across multiple sourcing options.

Substiute Parts

SS-668808-NF

Stewart ConnectorIn Stock: 963SS-668808-NF Datasheet

Current PartRFQ

5557566-1

TE Connectivity AMP ConnectorsIn Stock: 644825557566-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SS-668808-NF is determined by strict alignment of the following critical parameters:

• Connector Type & Contact Configuration: Must be Jack type with 8p8c (RJ45, Ethernet) contacts
• Mounting & Orientation: Through-hole mounting with 90° right-angle orientation required
• Termination Method: Solder termination only
• Shielding: Unshielded configuration
• Operating Temperature: Must support -40°C to 85°C range
• Compliance: ROHS3 compliance and active product status

The substitute part 5557566-1 (TE Connectivity AMP Connectors) meets all critical substitution criteria. While the substitute operates at Cat4 rating (versus Cat5 for the main part) and uses phosphor bronze contacts with thicker gold plating (50.0µin versus 30.0µin), these differences represent performance enhancements rather than incompatibilities. The substitute features a board guide instead of board lock, which is a mechanical variation that does not affect electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the SS-668808-NF and 5557566-1 are active products with ROHS3 compliance and identical operating temperature ranges. Selection between these parts should be based on:

• Supply Availability: The 5557566-1 substitute maintains significantly higher inventory (64,420 pcs versus 861 pcs), providing superior supply chain security
• Performance Rating: The SS-668808-NF operates at Cat5 specification, while the 5557566-1 operates at Cat4. For applications requiring Cat5 performance, the main part is the appropriate choice. For Cat4 or lower bandwidth requirements, the substitute is fully compatible
• Contact Material & Finish: The 5557566-1 uses phosphor bronze with thicker gold plating (50.0µin), which may provide enhanced durability in high-cycle insertion applications
• Mechanical Features: The SS-668808-NF includes board lock; the 5557566-1 includes board guide. Both provide mechanical retention; selection depends on PCB design requirements

Frequently Asked Questions (FAQ)

Q: Can 5557566-1 be used as a direct replacement for SS-668808-NF?

A: Yes, for applications operating at Cat4 or lower bandwidth specifications. The 5557566-1 meets all critical electrical and mechanical substitution criteria: 8p8c jack configuration, through-hole solder termination, 90° right-angle orientation, unshielded design, and identical operating temperature range. The Cat4 rating of the substitute is compatible with Cat5-capable systems, as Cat4 represents a subset of Cat5 performance.

Q: What is the difference between board lock and board guide features?

A: Both features provide mechanical retention to the PCB. Board lock uses a locking mechanism; board guide uses a guide structure. The choice depends on PCB design and assembly requirements. Verify your PCB design accommodates the specific retention feature of your selected part.

Q: Are there compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and share identical ECCN (EAR99) and HTSUS codes. Both are active products. No compliance barriers exist to substitution.

Q: What contact material differences exist, and do they affect compatibility?

A: The SS-668808-NF uses copper alloy contacts; the 5557566-1 uses phosphor bronze. Both are gold-plated. Phosphor bronze offers enhanced durability in high-cycle applications. This is a material enhancement, not a compatibility issue. Both materials are standard for modular connectors in this category.

Q: Does the thicker gold plating on 5557566-1 affect compatibility?

A: No. The 5557566-1 features 50.0µin gold plating versus 30.0µin on the SS-668808-NF. Thicker plating provides enhanced corrosion resistance and contact durability. This represents a performance enhancement and does not create compatibility issues.