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TE Connectivity AMP Connectors 5-557971-3 — Modular / RJ Connectors

TE 5-557971-3 Cat5 IDC Plug, 6p6c, Obsolete

MPN5-557971-3
Obsolete

TE Connectivity 557971 series Cat5 IDC plug, 6p6c (RJ11/RJ12/RJ14/RJ25), 0.530" body length, IDC termination, gold-plated phosphor bronze contacts, translucent-blue polycarbonate housing, unshielded, bulk.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5-557971-3 specifications
ParameterValue
Cable typeFlat Oval Cable, Stranded Wires
Connector typePlug
Wire gauge26-28 AWG
ColorTranslucent - Blue
Contact materialPhosphor Bronze
Housing materialPolycarbonate (PC)
Length0.530\" (13.46mm)
PackageBulk
RatingsCat5
ShieldingUnshielded
TerminationIDC
Contact finishGold
Contact finish thickness50.0µin (1.27µm)
Number of positions (Contacts)6p6c (RJ11, RJ12, RJ14, RJ25)

Product details

The TE Connectivity 5-557971-3 is a 6-position, 6-contact (6p6c) IDC plug designed for flat oval cable with stranded 26-28 AWG conductors. It is the plug half of a modular RJ-style interconnect — mates with a standard 6p6c jack (RJ11/RJ12/RJ14/RJ25 registered jack patterns). The translucent-blue polycarbonate housing allows a visual check of the IDC termination through the body. Rated Cat5, it supports 100 MHz signaling for 100BASE-TX Ethernet and similar data applications.

IDC termination — no stripping, no crimp tool. Solid wire will not terminate reliably in this plug.

Obsolete — Sourcing Reality

For a new design or a BOM line that needs a drop-in, the closest path is a parametric search for a 6p6c Cat5 IDC plug from TE or a compatible second source.

Frequently asked questions

Is 5-557971-3 compatible with Cat5e?

The plug is rated Cat5, not Cat5e. Cat5e requires tighter crosstalk and return-loss margins. While the plug may pass Cat5e in a short channel with good cable, it is not guaranteed to meet the Cat5e standard. For a Cat5e-rated assembly, use a plug explicitly rated Cat5e or higher.

Can I use 5-557971-3 with solid wire?

No. The plug is designed for flat oval cable with stranded 26-28 AWG wires. Solid conductors will not compress into the IDC slot properly and will produce an unreliable termination.