RJ11-4L-B Equivalent & Substitute Parts

Part Overview

The RJ11-4L-B is a modular jack connector manufactured by TE Connectivity Corcom Filters, designed for 6-position 4-contact (6p4c) applications conforming to RJ11 and RJ14 standards. This through-hole, right-angle unshielded connector features solder termination and is intended for board-mounted applications requiring modular connectivity.

The RJ11-4L-B carries an Obsolete product status, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. Equivalent parts must maintain identical electrical and mechanical specifications to ensure direct interchangeability without circuit redesign or board layout modifications.

Substiute Parts

RJ11-4L-B

TE Connectivity Corcom FiltersIn Stock: 870RJ11-4L-B Datasheet

Current PartRFQ

5520250-2

TE Connectivity AMP ConnectorsIn Stock: 63425520250-2 Datasheet

SimilarRFQ

88400-064LF

Amphenol ICC (FCI)In Stock: 212688400-064LF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RJ11-4L-B are qualified based on strict equivalence across the following critical parameters:

Electrical Compatibility:

• Connector type: Jack
• Contact configuration: 6p4c (RJ11, RJ14)
• Contact material: Phosphor Bronze
• Contact finish: Gold
• Shielding: Unshielded

Mechanical Compatibility:

• Mounting type: Through Hole
• Orientation: 90° Angle (Right)
• Termination method: Solder
• Tab direction: Down
• Number of ports: 1
• Number of rows: 1

Physical Compatibility:

• Housing material composition supporting polyester or polybutylene terephthalate (PBT) base materials
• Board lock and panel stop features

The identified substitute parts 5520250-2 and 88400-064LF satisfy all mandatory electrical and mechanical parameters. Both parts maintain identical contact configuration, mounting orientation, and termination characteristics required for direct board-level substitution.

Parameter Comparison

Engineering Selection Recommendations

5520250-2 (TE Connectivity AMP Connectors)

The 5520250-2 is the primary recommended substitute for the obsolete RJ11-4L-B. This part maintains full electrical and mechanical equivalence across all critical parameters. The 5520250-2 carries Active product status, ensuring long-term availability and supply chain stability. The part is RoHS Compliant and features an extended operating temperature range of -40°C to 85°C, providing superior thermal performance compared to the original specification. Contact finish thickness matches the original at 50.0µin (1.27µm). With 6,237 units in current inventory, this part is immediately available for production deployment.

88400-064LF (Amphenol ICC / FCI)

The 88400-064LF serves as a secondary substitute option, maintaining full electrical and mechanical compatibility with the RJ11-4L-B. This part carries Last Time Buy status, indicating limited future availability. The 88400-064LF is RoHS Compliant and operates across -40°C to 70°C, meeting standard industrial temperature requirements. A notable specification difference exists in contact finish thickness at 5.00µin (0.127µm), which is substantially lower than the original 50.0µin specification. This reduction in gold plating thickness may impact long-term contact reliability in corrosive environments or high-cycle insertion applications. The part carries REACH Affected status, requiring compliance verification for regulated substance content. Current inventory of 2,060 units is available.

Selection Guidance

For new designs and production continuity, the 5520250-2 is the preferred substitute due to Active product status, superior contact finish specification, and extended operating temperature range. The 88400-064LF is suitable for applications where contact finish thickness reduction is acceptable and where Last Time Buy inventory constraints do not impact project timelines.

Frequently Asked Questions (FAQ)

Q: Can the 5520250-2 be used as a direct replacement for the RJ11-4L-B without board redesign?

A: Yes. The 5520250-2 maintains identical electrical contact configuration (6p4c), mechanical mounting (through-hole, 90° right angle), termination method (solder), and physical features (board lock, panel stops, down tab direction). No circuit redesign or PCB layout modification is required.

Q: What is the significance of the contact finish thickness difference between the RJ11-4L-B and 88400-064LF?

A: The RJ11-4L-B and 5520250-2 specify 50.0µin (1.27µm) gold plating, while the 88400-064LF specifies 5.00µin (0.127µm). The thicker gold layer provides enhanced corrosion resistance and extended contact life under repeated insertion cycles. Applications involving frequent mating/unmating or exposure to corrosive atmospheres should prioritize the thicker finish specification.

Q: Why does the RJ11-4L-B show "Filter" as a feature while the substitutes do not?

A: The RJ11-4L-B is specified with integrated filter functionality, while the 5520250-2 and 88400-064LF are specified without this feature. If filter functionality is required for EMI suppression or signal integrity, the substitutes may not provide equivalent performance. Verify filter requirements in the original circuit design before substitution.

Q: What is the difference between Active and Last Time Buy product status?

A: Active status (5520250-2) indicates the manufacturer continues production and supports long-term availability. Last Time Buy status (88400-064LF) indicates the manufacturer has announced end-of-life, with limited production runs remaining. After the Last Time Buy window closes, the part becomes obsolete and unavailable. For production continuity, Active status parts are preferred.

Q: Are both substitute parts RoHS Compliant?

A: Yes. Both the 5520250-2 and 88400-064LF are RoHS Compliant, meeting EU Directive 2011/65/EU restrictions on hazardous substances. The original RJ11-4L-B does not specify RoHS status. Substitution with either part satisfies RoHS compliance requirements for new designs.

Q: What is the difference in operating temperature range between the substitutes?

A: The 5520250-2 operates across -40°C to 85°C, while the 88400-064LF operates across -40°C to 70°C. For applications requiring operation above 70°C, the 5520250-2 provides extended thermal capability. Both ranges cover standard industrial and commercial temperature requirements.

Q: What does REACH Affected status mean for the 88400-064LF?

A: REACH Affected status indicates the part contains substances regulated under the EU REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals) regulation. Compliance verification and documentation may be required for applications subject to REACH requirements. The 5520250-2 shows Vendor Undefined REACH status, requiring clarification from the manufacturer for regulated substance content.

Q: Can I mix RJ11-4L-B and substitute parts in the same production batch?

A: No. While the substitutes are electrically and mechanically equivalent, mixing different manufacturer parts in the same production batch introduces supply chain complexity and potential quality control issues. Select a single substitute part for standardization across production runs.

Q: What packaging formats are available for the substitute parts?

A: The 5520250-2 is supplied in Tray packaging, while the 88400-064LF is supplied in Tube packaging. Verify packaging compatibility with your assembly equipment and material handling processes before procurement.