SI-40144 Equivalent & Substitute Parts

Part Overview

The SI-40144 is a 4-port RJ45 modular connector manufactured by Stewart Connector, designed for 10/100 Base-T networking applications with AutoMDIX capability. This through-hole mounted connector features a 90° right-angle orientation and is part of the MagJack® ST SI-40000 series. The product is currently active and maintains 1136 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to component availability, supply chain considerations, or specific application requirements.

Substiute Parts

SI-40144

Stewart ConnectorIn Stock: 1184SI-40144 Datasheet

Current PartRFQ

J8064D648ANL

Pulse ElectronicsIn Stock: 977J8064D648ANL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI-40144 is determined by strict alignment of the following core parameters:

• Connector Type & Port Configuration: RJ45 connector with exactly 4 ports in a single row
• Mounting & Orientation: Through-hole mounting with 90° right-angle orientation
• Electrical Application: 10/100 Base-T or 10/100 Base-TX with AutoMDIX support
• Termination Method: Solder termination
• Shielding & EMI Protection: Shielded design with EMI finger
• Physical Compatibility: Height above board within acceptable tolerance range (0.536" to 0.545")
• Contact & Finish Specifications: Gold-plated contacts suitable for networking applications

The J8064D648ANL from Pulse Electronics meets all substitution criteria as a manufacturer-recommended equivalent, with compatible electrical ratings, identical port configuration, and equivalent mechanical form factor.

Parameter Comparison

Engineering Selection Recommendations

Both the SI-40144 and J8064D648ANL are active products with equivalent electrical and mechanical specifications suitable for 10/100 networking applications. The J8064D648ANL offers RoHS compliance, whereas the SI-40144 is RoHS non-compliant. Selection between these parts should be based on regulatory requirements, supply availability, and specific application compliance mandates. The height differential of 0.009" (0.23mm) is within standard PCB design tolerances and does not affect functional compatibility. Both parts maintain identical moisture sensitivity ratings and export classifications.

Frequently Asked Questions (FAQ)

Q: Can the J8064D648ANL directly replace the SI-40144 in existing designs?

A: Yes. Both connectors share identical RJ45 port configuration, through-hole mounting, 90° right-angle orientation, solder termination, and shielded EMI design. The 0.009" height difference is within standard PCB tolerance ranges and does not affect board layout compatibility.

Q: What is the difference between 10/100 Base-T and 10/100 Base-TX?

A: Both designations indicate 10/100 Mbps Ethernet capability with AutoMDIX support. Base-TX is the standard twisted-pair implementation. The functional performance for networking applications is equivalent.

Q: Are there compliance differences between these parts?

A: The J8064D648ANL is RoHS compliant, while the SI-40144 is RoHS non-compliant. Both are REACH unaffected and classified as EAR99. Selection should align with your product's regulatory requirements.

Q: Do the different LED colors affect functionality?

A: No. LED color differences (Green-Green vs. Green-Yellow) are cosmetic indicators only and do not impact electrical performance or compatibility.

Q: What is the significance of the contact finish thickness difference?

A: The SI-40144 specifies 50.0µin (1.27µm) gold plating, while the J8064D648ANL specifies 30.0µin (0.76µm). Both thicknesses provide adequate contact durability for 10/100 networking applications. The thicker plating on the SI-40144 may offer extended service life in high-cycle applications.

Q: Can these connectors be used interchangeably in production?

A: Yes, provided PCB layout accommodates the minor height variance and regulatory compliance requirements are met. Both parts are rated for unlimited moisture sensitivity and identical operating environments.