TE Connectivity 644631-2 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 644631-2 is a rectangular connector header, through-hole mounted, with 2 positions at 0.156" (3.96mm) pitch. This connector is part of the MTA-156 series and features shrouded design with friction lock fastening, suitable for general purpose and industrial applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design and procurement requirements.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.156" (3.96mm)
Number of Positions	2
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Shrouding	Shrouded - 1 Wall
Fastening Type	Friction Lock
Contact Shape	Square
Material Flammability Rating	UL94 V-0
Voltage Rating	600VAC
Operating Temperature	-55°C ~ 105°C
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 644631-2 is determined by the following critical parameters:

Primary Matching Criteria:

Connector type: Header
Contact type: Male Pin
Pitch - mating: 0.156" (3.96mm)
Number of positions: 2
Number of rows: 1
Mounting type: Through Hole
Termination: Solder
Shrouding: Shrouded - 1 Wall
Fastening type: Friction Lock
Contact shape: Square
Material flammability rating: UL94 V-0

Secondary Compatibility Factors:

Contact length - mating: 0.450" (11.43mm)
Insulation height: Acceptable range 0.446" to 0.545"
Overall contact length: Acceptable range 0.700" to 0.750"
Contact finish - mating: Gold or Tin acceptable
Insulation material: Thermoplastic or Polyester, Glass Filled acceptable

Substitute parts are grouped based on exact alignment with primary criteria. Secondary factors allow for minor dimensional variations that do not affect board-level compatibility or electrical performance within the specified operating parameters.

Parameter Comparison

Parameter	644631-2 (Main)	3-644631-2	0026604020	0026604022	0026606020	0026644020
Manufacturer	TE Connectivity	TE Connectivity	Molex	Molex	Molex	Molex
Series	MTA-156	MTA-156	KK396, 41791	KK396, 41791	KK396, 42891	KK396, 42491
Product Status	Obsolete	Active	Active	Active	Active	Active
Connector Type	Header	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Pitch - Mating	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)
Number of Positions	2	2	2	2	2	2
Number of Rows	1	1	1	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder
Shrouding	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall
Fastening Type	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock
Contact Shape	Square	Square	Square	Square	Square	Square
Contact Length - Mating	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)
Overall Contact Length	0.700" (17.78mm)	0.700" (17.78mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)
Insulation Height	0.545" (13.84mm)	0.545" (13.84mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)
Contact Finish - Mating	Gold	Gold	Tin	Tin	Tin	Tin
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Natural	Natural	Natural	Natural	Natural	Natural
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent - TE Connectivity 3-644631-2:

The 3-644631-2 is the direct active equivalent to the obsolete 644631-2. Both parts share identical electrical and mechanical specifications, including contact finish (Gold), insulation height (0.545"), and overall contact length (0.700"). The primary distinction is product status: 3-644631-2 is active with ROHS3 compliance, whereas 644631-2 is obsolete and non-compliant. For new designs and ongoing procurement, 3-644631-2 is the recommended replacement within the TE Connectivity MTA-156 series.

Molex Alternatives - KK396 Series:

Molex KK396 series connectors (0026604020, 0026604022, 0026606020, 0026644020) provide functional equivalence with the following considerations:

All Molex alternatives are active products with ROHS3 compliance and REACH unaffected status
Insulation height is reduced to 0.446" compared to 0.545" on the main part
Overall contact length is increased to 0.720" compared to 0.700" on the main part
Contact finish on mating surface is Tin rather than Gold
These dimensional and material differences do not affect electrical performance within the specified 600VAC, -55°C to 105°C operating envelope

Selection between Molex alternatives depends on specific application requirements:

0026604020, 0026604022, 0026606020: Standard tin-plated mating surface
0026606020, 0026606021, 0026606022: Include Board Lock feature
0026614020, 0026606022: Gold-plated mating surface (20.0µin thickness)
0026644020: Board Guide feature with Polyester insulation

All Molex alternatives support automotive, general purpose, industrial, medical, and telecommunications applications.

Frequently Asked Questions (FAQ)

Q: Can the obsolete 644631-2 be directly replaced with the 3-644631-2?

A: Yes. The 3-644631-2 is the direct active equivalent with identical electrical and mechanical specifications. The only differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No design modifications are required.

Q: What are the key differences between TE Connectivity and Molex alternatives?

A: The primary differences are insulation height (0.545" vs. 0.446"), overall contact length (0.700" vs. 0.720"), and contact finish on the mating surface (Gold vs. Tin). All alternatives maintain the same 0.156" pitch, 2-position configuration, and UL94 V-0 flammability rating. These differences do not affect electrical performance within the specified operating parameters.

Q: Are Molex KK396 series connectors compatible with existing TE Connectivity MTA-156 mating connectors?

A: Compatibility depends on the specific mating connector design. Both series use 0.156" (3.96mm) pitch and friction lock fastening. However, the reduced insulation height (0.446" vs. 0.545") and increased overall contact length (0.720" vs. 0.700") on Molex parts may affect mechanical fit with certain mating connectors. Physical verification is required before implementation.

Q: Which substitute part offers the best compliance profile?

A: All active substitute parts (3-644631-2 and all Molex alternatives) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity. The 3-644631-2 maintains the closest specification alignment to the original part while providing active product status and full compliance.

Q: What is the difference between Molex parts with Board Lock and Board Guide features?

A: Board Lock (0026606020, 0026606021, 0026606022) provides mechanical retention to the PCB through locking tabs. Board Guide (0026644020) provides alignment assistance without locking. Both features are optional and do not affect electrical performance. Selection depends on mechanical assembly requirements.

Q: Can I use a Molex part with gold-plated mating contacts (0026614020, 0026606022) as a direct replacement?

A: Yes, from an electrical standpoint. Gold plating (20.0µin thickness) provides superior corrosion resistance compared to tin plating (60.0µin thickness). However, the insulation height and overall contact length remain different from the original part. Mechanical compatibility with existing mating connectors must be verified.

Q: What is the significance of the contact finish thickness specifications?

A: Contact finish thickness affects durability and corrosion resistance. The original 644631-2 specifies 30.0µin (0.76µm) gold on the mating surface. Molex alternatives provide either 60.0µin (1.52µm) tin or 20.0µin (0.51µm) gold. Thicker finishes generally provide longer service life in corrosive environments, while thinner gold finishes reduce material cost.

Q: Are there any temperature or voltage limitations when substituting parts?

A: The original part specifies 600VAC and -55°C to 105°C operating temperature. Molex alternatives do not provide explicit voltage or temperature ratings in the available data. For applications requiring these specifications, the TE Connectivity 3-644631-2 is recommended to maintain documented performance parameters.

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