TE Connectivity AMP Connectors 644375-4 Equivalent & Substitute Parts

Part Overview

The TE Connectivity AMP Connectors 644375-4 is a 4 Position Rectangular Receptacle Connector with IDC (Insulation Displacement Contact) termination, designed for 18 AWG discrete or ribbon cable applications. This connector features tin-lead contact finish and operates as a free-hanging in-line component with locking ramp fastening. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for ongoing system support and new production requirements.

Substiute Parts

644375-4

TE Connectivity AMP ConnectorsIn Stock: 1165644375-4 Datasheet

Current PartRFQ

3-640599-4

TE Connectivity AMP ConnectorsIn Stock: 128263-640599-4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 644375-4 is based on strict equivalence across all critical electrical and mechanical parameters. The substitute part 3-640599-4 maintains identical specifications in the following key areas:

• Connector type classification (Receptacle)
• Position count and pitch geometry (4 positions at 0.156" spacing)
• Series designation (MTA-156)
• Cable termination technology (IDC)
• Wire gauge compatibility (18 AWG)
• Mounting configuration (Free Hanging In-Line)
• Contact type and finish thickness (Female Socket, 80.0µin)
• Fastening mechanism (Locking Ramp)
• Moisture sensitivity level (MSL 1 - Unlimited)

The primary distinction between the main part and substitute lies in contact finish composition (tin-lead versus tin) and product status (obsolete versus active). Both finishes meet the specified contact finish thickness requirement of 80.0µin (2.03µm), ensuring electrical performance equivalence.

Parameter Comparison

Engineering Selection Recommendations

The 3-640599-4 serves as the direct functional equivalent to the obsolete 644375-4 for all electrical and mechanical applications. Selection of the substitute part is supported by the following engineering considerations:

Product Status: The 644375-4 is classified as obsolete, making the active status of 3-640599-4 essential for ongoing procurement and production continuity.

Regulatory Compliance: The 3-640599-4 achieves ROHS3 compliance, whereas the 644375-4 is RoHS non-compliant. This distinction is significant for applications subject to RoHS directives and environmental regulations.

Electrical Equivalence: Both parts maintain identical contact finish thickness (80.0µin), pitch geometry (0.156"), and wire gauge specifications (18 AWG), ensuring electrical performance parity in IDC termination applications.

Mechanical Compatibility: Identical mounting configuration, fastening mechanism, and connector geometry guarantee direct mechanical interchangeability in existing designs.

Availability: The 3-640599-4 maintains substantial inventory (12,747 pieces), compared to the limited remaining stock of the obsolete 644375-4 (1,093 pieces), supporting long-term supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can the 3-640599-4 directly replace the 644375-4 in existing designs?

A: Yes. The 3-640599-4 maintains identical electrical and mechanical specifications across all critical parameters: 4-position configuration, 0.156" pitch, IDC termination, 18 AWG wire gauge, free-hanging in-line mounting, and locking ramp fastening. Direct substitution is supported without design modification.

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

A: Both finishes are applied at the same thickness (80.0µin / 2.03µm) and provide equivalent electrical performance in IDC connector applications. The tin finish of the 3-640599-4 represents a modern formulation compliant with ROHS3 regulations, whereas the tin-lead finish of the 644375-4 reflects legacy manufacturing standards.

Q: Are there packaging differences between these parts?

A: The 644375-4 packaging specification is not provided in the available data. The 3-640599-4 is supplied in bulk packaging. Confirm packaging requirements with your procurement specification before finalizing the substitution.

Q: Does the color difference (black versus orange) affect functionality?

A: No. Color is a cosmetic identifier and does not impact electrical or mechanical performance. The orange color of the 3-640599-4 may serve as a visual indicator of the updated part revision.

Q: What is the significance of the MSL 1 rating for both parts?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture control requirements. Both parts can be stored and handled under standard industrial conditions without special desiccation or environmental controls.

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

A: Yes. Both the 644375-4 and 3-640599-4 support discrete or ribbon cable termination via IDC technology at 18 AWG wire gauge, providing flexibility in cable assembly configurations.