SI-60125-F RJ45 Modular Connector Equivalent & Substitute Parts

Part Overview

The SI-60125-F is a 1-port RJ45 through-hole modular connector manufactured by Stewart Connector, designed for 10/100 Base-T Ethernet applications with AutoMDIX capability. This connector features a 90° right-angle orientation, solder termination, and integrated shielding with EMI finger protection. The part is actively produced and maintains ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when original stock availability is limited or when equivalent electrical and mechanical specifications can satisfy application requirements.

Substiute Parts

SI-60125-F

Stewart ConnectorIn Stock: 1146SI-60125-F Datasheet

Current PartRFQ

7499210121A

Würth ElektronikIn Stock: 2411807499210121A Datasheet

MFR RecommendedRFQ

ARJC02-111009D

Abracon LLCIn Stock: 1487ARJC02-111009D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI-60125-F are qualified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Connector Type: RJ45
• Number of Ports: 1
• Mounting Type: Through Hole
• Orientation: 90° Angle (Right)
• Termination: Solder
• Shielding: Shielded
• Tab Direction: Down
• Board Guide Feature: Present

Application Compatibility:

• Base Ethernet standard support (10/100 Base-T or 10/100 Base-TX)
• AutoMDIX capability
• Solder termination for PCB integration

Compliance Requirements:

• ROHS3 Compliant
• MSL 1 (Unlimited)
• Active product status

Two substitute parts meet these criteria: the Würth Elektronik 7499210121A and the Abracon LLC ARJC02-111009D. Both maintain the core electrical and mechanical specifications required for direct substitution in 10/100 Base-T Ethernet applications.

Parameter Comparison

Engineering Selection Recommendations

Würth Elektronik 7499210121A: This substitute maintains full compatibility with SI-60125-F for standard 10/100 Base-T applications. The part includes additional Power over Ethernet (PoE) support, making it suitable for applications requiring PoE functionality. The 6-core jack configuration accommodates PoE signaling while remaining backward compatible with standard 4-pair Ethernet wiring. Operating temperature range of -40°C to 85°C provides extended thermal performance. ROHS3 compliance and unlimited MSL rating ensure equivalent environmental reliability. Packaging in tube format supports automated assembly processes.

Abracon LLC ARJC02-111009D: This substitute provides direct functional equivalence for 10/100 Base-TX applications with AutoMDIX support. The 4-core jack configuration matches the original SI-60125-F specification. ROHS3 compliance and unlimited MSL rating maintain equivalent regulatory standing. Operating temperature range of 0°C to 70°C covers standard commercial environments. Tray packaging supports standard component handling. This part is suitable for applications where PoE capability is not required.

Both substitutes are actively produced with established supply availability and meet all mandatory compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 7499210121A be used as a direct replacement for SI-60125-F in non-PoE applications?

A: Yes. The 7499210121A maintains all core electrical and mechanical specifications required for 10/100 Base-T operation. The additional 6-core configuration and PoE support do not interfere with standard Ethernet functionality. The connector remains fully compatible with 4-pair twisted-pair cabling and standard RJ45 termination practices.

Q: What is the significance of the 4-core versus 6-core jack configuration?

A: The SI-60125-F and ARJC02-111009D feature 4-core jacks, supporting standard 10/100 Base-T Ethernet with 4-pair twisted-pair cabling. The Würth Elektronik 7499210121A features a 6-core jack to accommodate Power over Ethernet (PoE) signaling on additional conductor pairs. Both configurations are mechanically and electrically compatible with standard RJ45 connectors and cabling.

Q: Are there operating temperature differences that affect substitution?

A: The SI-60125-F does not specify an operating temperature range. The ARJC02-111009D operates from 0°C to 70°C, suitable for standard commercial environments. The Würth Elektronik 7499210121A operates from -40°C to 85°C, providing extended thermal performance for industrial or extreme environment applications. Selection should be based on the specific thermal requirements of the target application.

Q: How do packaging formats affect component selection?

A: SI-60125-F is supplied in standard packaging (format not specified). The Würth Elektronik 7499210121A is supplied in tube format, optimized for automated pick-and-place assembly. The Abracon ARJC02-111009D is supplied in tray format, supporting standard component handling. Packaging selection should align with assembly process requirements and inventory management practices.

Q: Do all three parts maintain equivalent compliance certifications?

A: Yes. All three parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. All parts are actively produced. The Würth Elektronik 7499210121A carries REACH Affected status, while SI-60125-F and ARJC02-111009D are REACH Unaffected. All parts share identical ECCN (EAR99) and HTSUS (8536.69.4040) classifications.