TE Connectivity 644663-8 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 644663-8 is an 8-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 20 AWG wire. This connector features a gold-plated contact finish, closed-end design with polarizing key, and free-hanging in-line mounting configuration. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production and field service applications.

Key Parameters

Parameter	Value
Connector Type	Rectangular Receptacle
Number of Positions	8
Pitch	0.156" (3.96mm)
Contact Type	Female Socket
Cable Termination Method	IDC (Insulation Displacement Contact)
Wire Gauge	20 AWG
Contact Finish	Gold
Contact Finish Thickness	30.0µin (0.76µm)
Mounting Type	Free Hanging (In-Line)
Fastening Type	Locking Ramp
Features	Closed End, Polarizing Key
Series	MTA-156

Substitute Part Grouping Explanation

Substitution eligibility for the TE Connectivity 644663-8 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Connector type: Rectangular receptacle
Number of positions: 8
Pitch: 0.156" (3.96mm)
Contact type: Female socket
Cable termination: IDC
Wire gauge: 20 AWG
Contact finish: Gold
Contact finish thickness: 30.0µin (0.76µm)
Mounting type: Free hanging (in-line)
Fastening type: Locking ramp
Features: Closed end with polarizing key
Series: MTA-156

The substitute part 3-644663-8 maintains complete electrical and mechanical compatibility with the original 644663-8 specification. The primary distinction between these parts is product status and packaging configuration, with 3-644663-8 classified as active and supplied in bulk packaging, whereas 644663-8 is obsolete.

Parameter Comparison

Parameter	644663-8 (Original)	3-644663-8 (Substitute)	Compatibility
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	Identical
Series	MTA-156	MTA-156	Identical
Connector Type	Rectangular Receptacle	Rectangular Receptacle	Identical
Number of Positions	8	8	Identical
Pitch	0.156" (3.96mm)	0.156" (3.96mm)	Identical
Contact Type	Female Socket	Female Socket	Identical
Cable Termination	IDC	IDC	Identical
Wire Gauge	20 AWG	20 AWG	Identical
Contact Finish	Gold	Gold	Identical
Contact Finish Thickness	30.0µin (0.76µm)	30.0µin (0.76µm)	Identical
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Identical
Fastening Type	Locking Ramp	Locking Ramp	Identical
Features	Closed End, Polarizing Key	Closed End, Polarizing Key	Identical
Color	Yellow	Yellow	Identical
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	RoHS Compliant	Substitute offers improved compliance
Packaging	Not specified	Bulk	Different packaging

Engineering Selection Recommendations

The part 3-644663-8 is the direct equivalent substitute for the obsolete 644663-8. Selection of 3-644663-8 is appropriate for the following reasons:

Product Status: The substitute part 3-644663-8 maintains active product status with TE Connectivity, ensuring continued availability and manufacturing support. The original 644663-8 is classified as obsolete and subject to discontinuation.

Regulatory Compliance: The substitute part 3-644663-8 is RoHS compliant, whereas the original 644663-8 is RoHS non-compliant. For applications subject to RoHS directives or customer requirements mandating RoHS compliance, 3-644663-8 is the appropriate selection.

Electrical and Mechanical Equivalence: All critical electrical and mechanical parameters are identical between the two parts, including connector geometry, contact configuration, termination method, and contact finish specifications. Direct functional interchangeability is established.

Packaging Consideration: The substitute is supplied in bulk packaging. Applications requiring specific packaging configurations should confirm bulk packaging compatibility with procurement and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can 3-644663-8 be used as a direct replacement for 644663-8 in existing designs?

A: Yes. The 3-644663-8 is electrically and mechanically equivalent to 644663-8 across all specified parameters. Direct substitution is supported without design modification.

Q: What is the primary reason for substitution?

A: The original part 644663-8 is classified as obsolete. The 3-644663-8 is the active equivalent from TE Connectivity, ensuring supply chain continuity and manufacturing support.

Q: Are there compliance differences between these parts?

A: Yes. The 3-644663-8 is RoHS compliant, while 644663-8 is RoHS non-compliant. For applications requiring RoHS compliance, 3-644663-8 is the appropriate selection.

Q: Do these connectors have identical contact finish specifications?

A: Yes. Both parts feature gold-plated contacts with 30.0µin (0.76µm) finish thickness, ensuring equivalent electrical performance and contact reliability.

Q: Is the packaging difference significant for component selection?

A: The substitute 3-644663-8 is supplied in bulk packaging. Confirm bulk packaging compatibility with your assembly and procurement processes. Packaging does not affect electrical or mechanical performance.

Q: Are the pitch and position count identical?

A: Yes. Both parts are 8-position connectors with 0.156" (3.96mm) pitch, maintaining full mechanical compatibility with mating connectors and PCB layouts.

Q: What is the wire gauge compatibility?

A: Both parts are rated for 20 AWG wire with IDC termination. Wire gauge specifications are identical.

Q: Are the mounting and fastening configurations the same?

A: Yes. Both parts feature free-hanging in-line mounting with locking ramp fastening, providing identical installation characteristics.

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