MODM-B-12-8P8C-U-S4 Equivalent & Substitute Parts

Part Overview

The MODM-B-12-8P8C-U-S4 is a modular jack connector manufactured by Samtec Inc., featuring 12 ports of 8p8c (RJ45/Ethernet) configuration in a 90° right-angle orientation with shielding and EMI finger protection. This connector is rated for Cat3 applications and is designed for through-hole PCB mounting with solder termination. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and legacy system support.

Substiute Parts

MODM-B-12-8P8C-U-S4

Samtec Inc.In Stock: 989MODM-B-12-8P8C-U-S4 Datasheet

Current PartRFQ

0811-2X6R-28-F

Bel Fuse Inc.In Stock: 11740811-2X6R-28-F Datasheet

SimilarRFQ

5569263-1

TE Connectivity AMP ConnectorsIn Stock: 21805569263-1 Datasheet

SimilarRFQ

6116000-1

TE Connectivity AMP ConnectorsIn Stock: 10806116000-1 Datasheet

SimilarRFQ

SS-73100-070

Stewart ConnectorIn Stock: 794SS-73100-070 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MODM-B-12-8P8C-U-S4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Connector Type: Jack
• Number of Ports: 12
• Number of Rows: 2
• Mounting Type: Through Hole
• Orientation: 90° Angle (Right)
• Termination: Solder
• Number of Positions/Contacts: 8p8c (RJ45, Ethernet)

Secondary Compatibility Parameters:

• Shielding configuration (Shielded with EMI Finger preferred for EMI-sensitive applications)
• Tab Direction: Up and Down
• Contact Finish: Gold
• RoHS compliance status

The substitute parts listed maintain the core mechanical and electrical interface requirements. Variations in contact material, housing material, operating temperature range, and category rating (Cat3 vs. Cat5/Cat5e) represent acceptable trade-offs based on application requirements and availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The TE Connectivity parts 5569263-1 and 6116000-1 are the most direct substitutes for the MODM-B-12-8P8C-U-S4. Both maintain identical mechanical interfaces, shielding configuration, contact material, and contact finish thickness. Both are active products with ROHS3 compliance. The primary difference is the upgraded category rating (Cat5 vs. Cat3), which provides enhanced performance headroom for legacy Cat3 applications. Operating temperature range is slightly reduced (-40°C to 85°C vs. -25°C to 90°C), which is acceptable for most industrial and commercial applications.

Secondary Substitute (Shielded Alternative):

The Bel Fuse 0811-2X6R-28-F maintains the 12-port, 2-row through-hole configuration with shielding and EMI finger protection. This part is optimized for 10/100 Base-T applications and includes AutoMDIX functionality. The reduced contact finish thickness (30.0µin vs. 50.0µin) and narrower operating temperature range (0°C to 70°C) may limit suitability for extended temperature environments.

Alternative Substitute (Unshielded Option):

The Stewart Connector SS-73100-070 provides a 12-port, 2-row through-hole configuration with Cat5e rating. This part is unshielded, making it unsuitable for EMI-sensitive applications but acceptable for general networking environments where the original shielding requirement is not critical. The reduced contact finish thickness and narrower operating temperature range apply similarly to the Bel Fuse option.

Compliance Consideration:

All substitute parts maintain RoHS3 compliance or equivalent, ensuring regulatory alignment with the original part's environmental standards.

Frequently Asked Questions (FAQ)

Q: Can I use an unshielded substitute (SS-73100-070) in place of the shielded MODM-B-12-8P8C-U-S4?

A: Only if your application does not require EMI shielding. The original part includes EMI finger shielding, which is critical for noise-sensitive environments. If EMI performance is specified in your system design, use a shielded substitute (5569263-1, 6116000-1, or 0811-2X6R-28-F).

Q: What is the difference between Cat3 and Cat5 ratings?

A: Cat3 supports data rates up to 10 Mbps, while Cat5 supports up to 100 Mbps. Substituting a Cat5-rated connector in a Cat3 application provides backward compatibility and performance headroom. The reverse substitution (Cat3 for Cat5) is not recommended.

Q: Are the TE Connectivity substitutes (5569263-1 and 6116000-1) interchangeable?

A: Yes. Both parts share identical mechanical interfaces, shielding, contact materials, and contact finish specifications. The primary difference is housing material (PCT/Polyester vs. Thermoplastic), which does not affect electrical or mechanical compatibility.

Q: Does the reduced operating temperature range of substitute parts affect compatibility?

A: The MODM-B-12-8P8C-U-S4 operates from -25°C to 90°C. Most substitutes operate from -40°C to 85°C or 0°C to 70°C. If your application requires operation above 85°C or below -40°C, verify the specific substitute's temperature rating against your system requirements.

Q: What is the significance of contact finish thickness?

A: The original part specifies 50.0µin (1.27µm) gold finish, while some substitutes offer 30.0µin (0.76µm). Thicker finishes provide enhanced durability and corrosion resistance in high-cycle mating environments. For applications with infrequent mating cycles, the thinner finish is acceptable.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts are supplied in Tray packaging, consistent with the original part's packaging format.