300668SEZ Modular Connector RJ45 Plug - Equivalent & Substitute Parts

Part Overview

The 300668SEZ is an active modular connector plug manufactured by Winchester Interconnect, designed for 8-position 8-contact (8p8c) RJ45 Ethernet applications. This shielded Cat6 crimp connector is specified for applications requiring electromagnetic interference protection and reliable signal transmission in network infrastructure. The part is RoHS compliant and maintains unlimited moisture sensitivity rating (MSL 1), making it suitable for standard environmental conditions. Substitute parts are identified when inventory constraints, lead time requirements, or specific application parameters necessitate alternative component selection while maintaining functional and electrical compatibility.

Substiute Parts

300668SEZ

Winchester InterconnectIn Stock: 961300668SEZ Datasheet

Current PartRFQ

0449150021

MolexIn Stock: 141700449150021 Datasheet

SimilarRFQ

SP688-C

Panduit CorpIn Stock: 1514SP688-C Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 300668SEZ are identified based on strict alignment with the following critical parameters:

Primary Compatibility Criteria:

• Connector Type: Plug configuration
• Number of Positions/Contacts: 8p8c (RJ45, Ethernet) standard
• Ratings: Cat6 performance category
• Contact Finish: Gold plating
• Product Status: Active

Secondary Consideration Parameters:

• Shielding configuration (shielded vs. unshielded)
• Termination method (crimp vs. IDC)
• Cable type compatibility
• Contact finish thickness variance
• Housing material composition

The substitute parts listed below maintain the core 8p8c RJ45 Ethernet plug functionality and Cat6 rating. However, variations exist in shielding type, termination method, and physical dimensions that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

300668SEZ (Winchester Interconnect) - Primary Specification

The 300668SEZ remains the specified component for applications requiring shielded 8p8c RJ45 Cat6 crimp termination. Active product status and RoHS compliance confirm ongoing manufacturer support and regulatory alignment. The part maintains unlimited MSL rating suitable for standard storage and handling conditions.

0449150021 (Molex) - Shielded Crimp Alternative

The Molex 0449150021 provides functional equivalence for shielded Cat6 RJ45 plug applications with crimp termination. Both parts share identical shielding configuration and termination method. ROHS3 compliance and active status confirm regulatory currency. The Molex part specifies higher contact finish thickness (50.0µin vs. 15.0µin) and defined electrical ratings (1.5A, 56.5V). Compatibility with round cable types (22-28 AWG) and polycarbonate housing provides alternative mechanical characteristics. Significantly higher inventory availability (14128 pcs) addresses lead time constraints.

SP688-C (Panduit Corp) - Unshielded IDC Alternative

The Panduit SP688-C provides Cat6 RJ45 plug functionality with critical differences in shielding and termination. This part is unshielded and uses IDC (insulation displacement contact) termination rather than crimp. These differences restrict substitution to applications where electromagnetic interference protection is not required and IDC termination is compatible with existing assembly processes. The part is designed for flat oval cable types (23-24 AWG). ROHS3 compliance and active status are confirmed. MSL rating is not applicable due to IDC termination method.

Selection Criteria Summary:

• For shielded crimp applications: 300668SEZ or 0449150021 are functionally equivalent
• For unshielded IDC applications: SP688-C is suitable only when shielding is not required
• For lead time optimization: 0449150021 offers highest inventory availability
• For regulatory compliance: All three parts maintain active status and RoHS compliance

Frequently Asked Questions (FAQ)

Q: Can the Molex 0449150021 directly replace the Winchester 300668SEZ?

A: Yes, for applications requiring shielded 8p8c RJ45 Cat6 crimp termination. Both parts share identical connector type, position count, shielding configuration, ratings, and termination method. The Molex part specifies higher contact finish thickness and defined electrical ratings. Mechanical compatibility depends on cable type and connector housing dimensions.

Q: Is the Panduit SP688-C a suitable substitute for the 300668SEZ?

A: No, for most applications. The SP688-C is unshielded and uses IDC termination, whereas the 300668SEZ is shielded with crimp termination. Substitution is only valid for applications where electromagnetic interference protection is not required and IDC termination is compatible with assembly processes. The SP688-C is designed for flat oval cable types, not round cables.

Q: What are the key differences between crimp and IDC termination methods?

A: Crimp termination (300668SEZ, 0449150021) requires mechanical crimping tools to compress contacts onto individual wire strands. IDC termination (SP688-C) uses insulation displacement contacts that pierce wire insulation without stripping. IDC termination is faster but less reliable in high-vibration environments. Crimp termination provides superior contact reliability and is standard for Cat6 Ethernet applications.

Q: Does contact finish thickness affect compatibility?

A: Contact finish thickness does not affect electrical compatibility but influences contact durability and wear resistance. The 300668SEZ specifies 15.0µin (0.38µm), while the Molex 0449150021 specifies 50.0µin (1.27µm). Thicker plating provides extended contact life in high-cycle mating applications. For standard network installations, both thicknesses are acceptable.

Q: Are all three parts RoHS compliant?

A: Yes. The 300668SEZ is RoHS Compliant. The Molex 0449150021 and Panduit SP688-C are both ROHS3 Compliant, indicating compliance with the updated RoHS 3 directive. All parts meet current regulatory requirements for electronic component manufacturing.

Q: What cable types are compatible with each connector?

A: The 300668SEZ does not specify cable type in provided data. The Molex 0449150021 is compatible with round cable (solid or stranded wires, 22-28 AWG). The Panduit SP688-C is designed for flat oval cable (solid or stranded wires, 23-24 AWG). Cable type compatibility must be verified against specific application requirements and assembly equipment.

Q: Why does the Panduit SP688-C have a longer length than the Molex part?

A: The SP688-C length of 1.600" (40.64mm) reflects its IDC termination design and flat oval cable accommodation. The Molex 0449150021 length of 0.885" (22.48mm) is optimized for round cable crimp termination. Length differences affect connector insertion depth and cable strain relief geometry. Selection depends on specific mechanical installation requirements.

Q: What is the significance of MSL rating differences?

A: The 300668SEZ and Molex 0449150021 both specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling. The Panduit SP688-C lists MSL as Not Applicable because IDC connectors do not require moisture sensitivity classification. MSL rating is relevant only for components with moisture-sensitive materials or processes.

Q: Can these connectors be used interchangeably in existing Cat6 network installations?

A: Interchangeability depends on specific installation requirements. For shielded Cat6 crimp applications, the 300668SEZ and Molex 0449150021 are interchangeable. The Panduit SP688-C is not interchangeable in shielded applications and requires different assembly equipment (IDC vs. crimp tools). Existing network infrastructure specifications must be reviewed before substitution.