TE Connectivity 643820-9 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643820-9 is a 9-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 24 AWG discrete or ribbon cable. This connector features a tin-lead contact finish, closed-end design, and polarizing key for secure mating.

The 643820-9 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

643820-9

TE Connectivity AMP ConnectorsIn Stock: 1008643820-9 Datasheet

Current PartRFQ

3-643820-9

TE Connectivity AMP ConnectorsIn Stock: 9303-643820-9 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 643820-9 is determined by strict equivalence across the following critical parameters:

• Connector Type & Position Count: Receptacle configuration with 9 positions
• Pitch & Row Configuration: 0.156" (3.96mm) pitch, single-row layout
• Termination Method: IDC cable termination for 24 AWG wire
• Mechanical Interface: Free hanging in-line mounting with locking ramp fastening
• Functional Features: Closed-end design with polarizing key
• Contact Geometry: Female socket contacts with 80.0µin (2.03µm) finish thickness

The substitute part 3-643820-9 maintains identical electrical and mechanical specifications across all these parameters. The primary difference is the contact finish material (tin versus tin-lead) and product status (active versus obsolete).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 3-643820-9

The 3-643820-9 is the direct functional equivalent of the 643820-9 and is the appropriate selection for new designs and component replacement applications.

Compliance Advantages:

The 3-643820-9 is ROHS3 compliant, whereas the 643820-9 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements mandating RoHS compliance, the 3-643820-9 is the required selection.

Contact Finish Difference:

The 643820-9 features a tin-lead contact finish, while the 3-643820-9 uses pure tin. Both finishes provide equivalent electrical performance and contact reliability at the specified 80.0µin (2.03µm) thickness. The tin finish in the 3-643820-9 aligns with modern manufacturing standards and environmental regulations.

Product Status:

The 643820-9 is obsolete and no longer manufactured. The 3-643820-9 is active and maintains current production status, ensuring long-term availability and supply chain continuity.

Mechanical & Electrical Compatibility:

Both connectors are mechanically and electrically interchangeable. The 9-position, 0.156" pitch receptacle configuration, IDC termination method, and locking ramp fastening are identical. Mating plugs and cable assemblies designed for the 643820-9 are fully compatible with the 3-643820-9.

Frequently Asked Questions (FAQ)

Q: Are the 643820-9 and 3-643820-9 mechanically interchangeable?

A: Yes. Both connectors share identical mechanical specifications: 9-position receptacle, 0.156" (3.96mm) pitch, single-row configuration, free-hanging in-line mounting, and locking ramp fastening. Mating plugs and cable assemblies are fully compatible.

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

A: The 643820-9 uses tin-lead; the 3-643820-9 uses pure tin. Both finishes provide equivalent electrical conductivity and contact reliability at the specified 80.0µin (2.03µm) thickness. The tin finish is the current standard and aligns with RoHS compliance requirements.

Q: Why is the 643820-9 listed as obsolete?

A: The 643820-9 is no longer in active production. The 3-643820-9 supersedes it as the current production equivalent, offering improved compliance status and modern manufacturing standards.

Q: Can I use the 3-643820-9 in applications originally designed for the 643820-9?

A: Yes. The 3-643820-9 is a direct functional substitute. All electrical and mechanical parameters are equivalent, ensuring seamless integration into existing designs and assemblies.

Q: What is the Moisture Sensitivity Level (MSL) for these connectors?

A: Both the 643820-9 and 3-643820-9 have an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Q: Are both connectors suitable for IDC termination with 24 AWG cable?

A: Yes. Both connectors are designed for IDC termination with 24 AWG discrete or ribbon cable. The termination method and wire gauge specifications are identical.

Q: What is the significance of the polarizing key feature?

A: The polarizing key ensures correct mating orientation between the receptacle and plug connector, preventing incorrect insertion and potential circuit damage. This feature is present on both the 643820-9 and 3-643820-9.

Q: Is the 3-643820-9 available in bulk packaging?

A: Yes. The 3-643820-9 is supplied in bulk packaging, with 839 pieces currently in stock as new original inventory.