TE Connectivity 643818-7 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643818-7 is a 7-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 20 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 part is currently active in production with 954 units in stock. Substitute parts are identified to address inventory availability, compliance requirements, or packaging preferences while maintaining electrical and mechanical compatibility.

Substiute Parts

643818-7

TE Connectivity AMP ConnectorsIn Stock: 968643818-7 Datasheet

Current PartRFQ

3-643818-7

TE Connectivity AMP ConnectorsIn Stock: 22793-643818-7 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between the main part 643818-7 and the identified substitute 3-643818-7 is valid based on the following criteria:

Electrical Compatibility:

• Identical number of positions (7)
• Identical pitch spacing (0.156" / 3.96mm)
• Identical wire gauge specification (20 AWG)
• Identical contact type (Female Socket)
• Identical contact finish thickness (80.0µin / 2.03µm)

Mechanical Compatibility:

• Identical connector type (Receptacle)
• Identical series designation (MTA-156)
• Identical mounting configuration (Free Hanging In-Line)
• Identical fastening mechanism (Locking Ramp)
• Identical cable termination method (IDC)
• Identical feature set (Closed End, Polarizing Key)
• Identical number of rows (1)

Functional Equivalence: Both parts are designed for identical applications with discrete or ribbon cable in 20 AWG configurations. The primary difference is the contact finish material (tin-lead versus tin) and packaging format (unspecified versus bulk), with the substitute offering improved RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The 643818-7 and 3-643818-7 are functionally equivalent rectangular receptacle connectors suitable for direct substitution in MTA-156 series applications requiring 7-position IDC termination with 20 AWG cable.

RoHS Compliance Consideration:

The substitute part 3-643818-7 is RoHS compliant with tin contact finish, while the main part 643818-7 is RoHS non-compliant with tin-lead contact finish. Selection between these parts depends on regulatory requirements for the end application. Applications subject to RoHS directives require the 3-643818-7 substitute. Applications without RoHS constraints may use either part.

Inventory and Packaging:

The substitute part 3-643818-7 offers significantly higher inventory availability (2219 units versus 954 units) and is supplied in bulk packaging. The main part 643818-7 is supplied in unspecified packaging. Selection may be influenced by procurement volume requirements and packaging preferences.

Contact Finish Consideration:

The tin-lead finish of 643818-7 and tin finish of 3-643818-7 both meet the specified contact finish thickness of 80.0µin (2.03µm). Both finishes are suitable for IDC termination applications with 20 AWG cable. The choice between tin-lead and tin depends on application-specific requirements and regulatory compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can the 3-643818-7 substitute directly replace the 643818-7 in existing designs?

A: Yes. Both connectors are electrically and mechanically equivalent. They share identical specifications for number of positions (7), pitch (0.156"), connector type (receptacle), contact type (female socket), cable termination method (IDC), wire gauge (20 AWG), mounting configuration (free hanging in-line), fastening mechanism (locking ramp), and feature set (closed end with polarizing key). Direct substitution is valid from a functional standpoint.

Q: What is the difference between the tin-lead finish of 643818-7 and the tin finish of 3-643818-7?

A: The main part 643818-7 uses tin-lead contact finish, while the substitute 3-643818-7 uses tin contact finish. Both finishes meet the specified thickness of 80.0µin (2.03µm). The tin finish of the substitute part enables RoHS compliance, whereas the tin-lead finish of the main part does not. Contact finish selection depends on regulatory requirements and application constraints.

Q: Are there any compatibility issues when substituting between these parts?

A: No compatibility issues exist. Both parts are from the same MTA-156 series and share identical mechanical and electrical parameters. They interface identically with mating connectors, cable assemblies, and PCB layouts. The polarizing key feature ensures correct orientation in both cases.

Q: Why does the 3-643818-7 have higher inventory availability?

A: The substitute part 3-643818-7 is supplied in bulk packaging and has 2219 units in stock compared to 954 units for the main part 643818-7. Higher inventory reflects market demand and supply chain positioning for the RoHS-compliant variant.

Q: Which part should be selected for new designs?

A: For new designs, the 3-643818-7 is the appropriate selection due to its RoHS compliance status, which aligns with current regulatory standards and industry practices. The main part 643818-7 remains suitable for legacy applications or designs without RoHS constraints.

Q: Are both parts suitable for ribbon cable and discrete wire applications?

A: Yes. Both the 643818-7 and 3-643818-7 support discrete or ribbon cable termination via IDC method with 20 AWG wire gauge. The IDC termination mechanism and contact design are identical in both parts.

Q: What is the significance of the MTA-156 series designation?

A: The MTA-156 series designation indicates the connector family standard, which defines the 0.156" (3.96mm) pitch spacing and the overall mechanical and electrical interface specifications. Both parts conform to this series standard, ensuring interchangeability within MTA-156 applications.