TE Connectivity 644718-3 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 644718-3 is a 3-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 18 AWG wire. This connector features gold-plated contacts, a polarizing key, and feed-through capability for discrete or ribbon cable applications.

The 644718-3 is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and production requirements where this connector is specified in existing designs or systems.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	3
Pitch	0.156" (3.96mm)
Number of Rows	1
Cable Termination Method	IDC
Wire Gauge	18 AWG
Contact Finish	Gold
Contact Finish Thickness	30.0µin (0.76µm)
Mounting Type	Free Hanging (In-Line)
Fastening Type	Locking Ramp
Features	Feed Through, Polarizing Key
Color	Orange
Series	MTA-156

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 644718-3 is determined by strict equivalence across the following critical parameters:

Connector Type & Contact Configuration: Receptacle with female socket contacts
Position Count & Pitch: 3 positions at 0.156" (3.96mm) pitch
Termination Method: IDC cable termination
Wire Gauge Compatibility: 18 AWG
Contact Material & Finish: Gold plating at 30.0µin (0.76µm) thickness
Mechanical Features: Locking ramp fastening, polarizing key, feed-through capability
Series Designation: MTA-156

Parts meeting all these parameters are classified as direct equivalents and may be substituted without modification to the connector interface or cable assembly.

Parameter Comparison

Parameter	644718-3 (Main Part)	3-644718-3 (Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Series	MTA-156	MTA-156
Connector Type	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket
Number of Positions	3	3
Pitch	0.156" (3.96mm)	0.156" (3.96mm)
Number of Rows	1	1
Cable Termination	IDC	IDC
Wire Type	Discrete or Ribbon Cable	Discrete or Ribbon Cable
Wire Gauge	18 AWG	18 AWG
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)
Fastening Type	Locking Ramp	Locking Ramp
Features	Feed Through, Polarizing Key	Feed Through, Polarizing Key
Contact Finish	Gold	Gold
Contact Finish Thickness	30.0µin (0.76µm)	30.0µin (0.76µm)
Color	Orange	Orange
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99

Engineering Selection Recommendations

The 3-644718-3 is a direct functional equivalent to the obsolete 644718-3. Both parts are manufactured by TE Connectivity AMP Connectors and share identical electrical and mechanical specifications across all critical parameters.

Product Status Consideration: The 644718-3 is obsolete, while the 3-644718-3 is active. The active status of the substitute part ensures continued availability for procurement and supply chain continuity.

Compliance Status: Both parts maintain RoHS compliance. The 644718-3 carries ROHS3 Compliant status, while the 3-644718-3 carries RoHS Compliant status. Both are classified as ECCN EAR99 and carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special storage or handling requirements.

Packaging Difference: The main part 644718-3 is supplied in standard packaging, while the substitute 3-644718-3 is supplied in bulk packaging. This difference does not affect connector performance or compatibility.

The 3-644718-3 is suitable for direct substitution in applications currently specified for the 644718-3 without requiring design modifications or cable assembly changes.

Frequently Asked Questions (FAQ)

Q: Can the 3-644718-3 be used as a direct replacement for the 644718-3?

A: Yes. The 3-644718-3 is a direct equivalent. Both connectors share identical specifications for connector type, contact configuration, position count, pitch, termination method, wire gauge, contact finish, and mechanical features. No design or assembly modifications are required.

Q: What is the difference between the 644718-3 and 3-644718-3?

A: The primary differences are product status and packaging. The 644718-3 is obsolete and supplied in standard packaging. The 3-644718-3 is active and supplied in bulk packaging. All electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns when substituting the 3-644718-3 for the 644718-3?

A: No. Both connectors are from the MTA-156 series with identical pitch, position count, and contact specifications. They are mechanically and electrically interchangeable.

Q: Does the bulk packaging of the 3-644718-3 affect its performance?

A: No. Packaging format does not affect connector performance, electrical characteristics, or mechanical function. The bulk packaging is a supply and logistics consideration only.

Q: Are both parts RoHS compliant?

A: Yes. The 644718-3 is ROHS3 Compliant, and the 3-644718-3 is RoHS Compliant. Both meet regulatory requirements for hazardous substance restrictions.

Q: What wire gauge is compatible with these connectors?

A: Both connectors are rated for 18 AWG wire. The IDC termination method accommodates discrete or ribbon cable of this gauge.

Q: Is there a difference in contact finish between the two parts?

A: No. Both connectors feature gold-plated contacts with identical finish thickness of 30.0µin (0.76µm).

Q: What is the pitch specification for these connectors?

A: Both connectors have a pitch of 0.156" (3.96mm), which is the standard spacing for the MTA-156 series.

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