TE Connectivity 643821-7 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643821-7 is a 7-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 26 AWG discrete or ribbon cable. This connector features a tin-lead contact finish, closed-end design with polarizing key, and free-hanging in-line mounting configuration.

The 643821-7 is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and new design requirements where this connector type is specified or functionally required.

Substiute Parts

643821-7

TE Connectivity AMP ConnectorsIn Stock: 1146643821-7 Datasheet

Current PartRFQ

3-643821-7

TE Connectivity AMP ConnectorsIn Stock: 10463-643821-7 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 643821-7 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Connector type (Receptacle)
• Number of positions (7)
• Pitch specification (0.156" / 3.96mm)
• Number of rows (1)
• Contact type (Female Socket)
• Cable termination method (IDC)
• Wire gauge compatibility (26 AWG)
• Wire type support (Discrete or Ribbon Cable)
• Mounting type (Free Hanging In-Line)
• Fastening type (Locking Ramp)
• Design features (Closed End, Polarizing Key)
• Series designation (MTA-156)

The substitute part 3-643821-7 maintains full equivalence across all mandatory parameters. The primary difference is the contact finish specification: the original part uses tin-lead plating, while the substitute uses tin plating. Both finishes are applied at 80.0µin (2.03µm) thickness and are compatible with the same IDC termination process and mating interface.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement:

The 3-643821-7 is the direct substitute for the obsolete 643821-7. Both parts are manufactured by TE Connectivity within the MTA-156 series and share identical mechanical and electrical specifications for connector interface, termination method, and wire compatibility.

Compliance Considerations:

The original 643821-7 is RoHS non-compliant due to its tin-lead contact finish. The substitute 3-643821-7 is RoHS compliant with tin plating. For applications subject to RoHS regulations or environmental compliance requirements, the 3-643821-7 is the appropriate selection.

Product Status:

The 643821-7 is obsolete with no active manufacturing. The 3-643821-7 is active and currently in production, ensuring long-term availability and supply chain continuity.

Contact Finish Difference:

The transition from tin-lead to tin plating does not affect connector performance, mating characteristics, or IDC termination compatibility. Both finishes provide equivalent electrical conductivity and contact reliability at the specified thickness of 80.0µin (2.03µm).

Frequently Asked Questions (FAQ)

Q: Can the 3-643821-7 directly replace the 643821-7 in existing designs?

A: Yes. The 3-643821-7 is mechanically and electrically equivalent to the 643821-7. All connector interface dimensions, contact configurations, termination methods, and wire gauge specifications are identical. The connector will mate with the same plug connectors and accept the same 26 AWG discrete or ribbon cable.

Q: What is the difference between tin-lead and tin contact finishes?

A: The original 643821-7 uses tin-lead plating, while the 3-643821-7 uses tin plating. Both are applied at the same thickness (80.0µin / 2.03µm) and provide equivalent electrical performance and contact reliability. The tin finish eliminates lead content, making the 3-643821-7 RoHS compliant.

Q: Why is the 643821-7 listed as obsolete?

A: The 643821-7 is no longer in active production. The 3-643821-7 represents the current active equivalent within the MTA-156 series, incorporating modern compliance standards while maintaining full functional compatibility.

Q: Are there any packaging differences between these parts?

A: The 643821-7 packaging is not specified in the available data. The 3-643821-7 is supplied in bulk packaging. Confirm packaging requirements with your procurement specifications.

Q: Will the IDC termination process work identically for both parts?

A: Yes. Both connectors use the same IDC (Insulation Displacement Contact) termination method and accept 26 AWG discrete or ribbon cable. The termination tool, process parameters, and resulting connection quality are identical.

Q: Is the 3-643821-7 suitable for applications requiring RoHS compliance?

A: Yes. The 3-643821-7 is RoHS compliant. The 643821-7 is RoHS non-compliant. For any application subject to RoHS regulations, the 3-643821-7 is the required selection.

Q: What is the moisture sensitivity level for these connectors?

A: Both the 643821-7 and 3-643821-7 have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without moisture control requirements.