TE Connectivity 640605-4 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 640605-4 is a 4-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 tin-lead contact finish and is classified as obsolete product status.

Due to its obsolete classification, locating equivalent or substitute components is necessary for ongoing system maintenance, repair, and new design implementations. The substitute part identified maintains functional compatibility while offering improved product status and compliance characteristics.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	4
Pitch	0.156" (3.96mm)
Number of Rows	1
Cable Termination Method	IDC
Wire Gauge	20 AWG
Wire Type	Discrete or Ribbon Cable
Contact Type	Female Socket
Mounting Type	Free Hanging (In-Line)
Series	MTA-156
Contact Finish Thickness	80.0µin (2.03µm)
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution compatibility for the TE Connectivity 640605-4 is determined by the following critical parameters:

Connector Type & Position Configuration: Receptacle with 4 positions
Pitch Specification: 0.156" (3.96mm) contact spacing
Termination Method: IDC technology for cable attachment
Wire Gauge Compatibility: 20 AWG rated capacity
Series Designation: MTA-156 series classification
Contact Geometry: Female socket configuration
Mounting Interface: Free hanging in-line orientation

The substitute part 3-640605-4 maintains identical specifications across all these critical parameters, ensuring direct functional equivalence. The primary differences are contact finish composition (tin versus tin-lead) and product status classification (active versus obsolete).

Parameter Comparison

Parameter	640605-4 (Main Part)	3-640605-4 (Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Series	MTA-156	MTA-156
Connector Type	Receptacle	Receptacle
Number of Positions	4	4
Contact Type	Female Socket	Female Socket
Pitch	0.156" (3.96mm)	0.156" (3.96mm)
Number of Rows	1	1
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)
Cable Termination	IDC	IDC
Wire Type	Discrete or Ribbon Cable	Discrete or Ribbon Cable
Wire Gauge	20 AWG	20 AWG
Contact Finish	Tin-Lead	Tin
Contact Finish Thickness	80.0µin (2.03µm)	80.0µin (2.03µm)
Color	Yellow	Yellow
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.8000	8536.69.8000

Engineering Selection Recommendations

The substitute part 3-640605-4 is the direct equivalent for the obsolete 640605-4 connector. Selection between these parts is determined by regulatory and compliance requirements:

For applications requiring RoHS compliance: The 3-640605-4 substitute part is the appropriate selection. This part carries active product status and RoHS compliant certification, meeting current environmental and regulatory standards.

For legacy systems or applications with existing tin-lead specifications: The original 640605-4 remains functionally compatible, though its obsolete status limits long-term availability. The tin-lead contact finish of the original part may be required for specific legacy system compatibility.

For new designs and ongoing procurement: The 3-640605-4 is the recommended selection due to active product status, ensuring continued availability and supply chain stability. The tin contact finish meets equivalent electrical performance specifications while providing regulatory compliance.

Both parts maintain identical mechanical and electrical parameters across connector geometry, pitch, termination method, wire gauge rating, and mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can the 3-640605-4 directly replace the 640605-4 in existing assemblies?

A: Yes. Both connectors maintain identical specifications for connector type, position count, pitch, termination method, wire gauge, and mounting configuration. The primary difference is contact finish composition (tin versus tin-lead) and product status. Electrical and mechanical compatibility is maintained.

Q: What is the significance of the contact finish difference between tin-lead and tin?

A: The contact finish composition affects material properties and regulatory compliance. The tin-lead finish of the original part is non-compliant with RoHS regulations. The tin finish of the substitute part provides RoHS compliance while maintaining the same contact finish thickness specification of 80.0µin (2.03µm).

Q: Why is the original 640605-4 classified as obsolete?

A: Obsolete classification indicates the part is no longer in active production. The substitute part 3-640605-4 represents the current active equivalent in the TE Connectivity product line.

Q: Are there packaging differences between these parts?

A: The original 640605-4 packaging is not specified in available documentation. The substitute 3-640605-4 is supplied in bulk packaging. Confirm packaging requirements for your specific application needs.

Q: What is the MSL rating and why is it relevant?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations. These connectors do not require special moisture control during storage or handling.

Q: Can these connectors be used with both discrete and ribbon cable?

A: Yes. Both the 640605-4 and 3-640605-4 are rated for discrete or ribbon cable termination using IDC technology at 20 AWG wire gauge.

Q: What does the feed-through feature indicate?

A: The feed-through feature indicates the connector allows signal or power to pass through the connector body, enabling daisy-chain or series connection configurations in ribbon cable applications.

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