TE Connectivity 644861-4 Rectangular Connector Header Equivalent & Substitute Parts

Part Overview

The TE Connectivity 644861-4 is a shrouded rectangular connector header designed for through-hole mounting in board-to-cable/wire applications. This component features a 4-position, single-row configuration with 0.100" (2.54mm) pitch spacing and is part of the MTA-100 series. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	644861-4
Manufacturer	TE Connectivity AMP Connectors
Series	MTA-100
Connector Type	Header
Contact Type	Male Pin
Number of Positions	4
Pitch - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Shrouding	Shrouded - 4 Wall
Voltage Rating	250VAC
Operating Temperature	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 644861-4 is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Parameters:

Connector type (Header)
Contact type (Male Pin)
Number of positions (4)
Pitch spacing (0.100" / 2.54mm)
Voltage rating (250VAC)
Operating temperature range (-55°C ~ 105°C)

Mechanical Compatibility Parameters:

Mounting type (Through Hole)
Shrouding configuration (Shrouded - 4 Wall)
Contact shape (Square)
Insulation material (Polyester)
Flammability rating (UL94 V-0)

Termination Parameters:

Termination method (Solder)
Fastening type (Friction Lock)

The substitute part 2-644861-4 maintains full equivalence across all critical electrical and mechanical parameters. The primary distinction is product status (active versus obsolete) and packaging configuration (bulk versus standard).

Parameter Comparison

Parameter	644861-4 (Main Part)	2-644861-4 (Substitute)	Compatibility
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	Identical
Series	MTA-100	MTA-100	Identical
Connector Type	Header	Header	Identical
Contact Type	Male Pin	Male Pin	Identical
Number of Positions	4	4	Identical
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Identical
Number of Rows	1	1	Identical
Mounting Type	Through Hole	Through Hole	Identical
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Identical
Termination	Solder	Solder	Identical
Fastening Type	Friction Lock	Friction Lock	Identical
Contact Length - Mating	0.200" (5.08mm)	0.200" (5.08mm)	Identical
Contact Length - Post	0.140" (3.56mm)	0.140" (3.56mm)	Identical
Overall Contact Length	0.440" (11.18mm)	0.440" (11.18mm)	Identical
Insulation Height	0.410" (10.41mm)	0.410" (10.41mm)	Identical
Contact Shape	Square	Square	Identical
Contact Finish - Mating	Tin-Lead	Tin	Compatible
Contact Finish - Post	Tin-Lead	Tin	Compatible
Contact Material	Copper Alloy	Copper Alloy	Identical
Insulation Material	Polyester	Polyester	Identical
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	Identical
Material Flammability Rating	UL94 V-0	UL94 V-0	Identical
Insulation Color	Black	Black	Identical
Voltage Rating	250VAC	250VAC	Identical
Current Rating	Varies by Wire Gauge	Varies by Wire Gauge	Identical
Applications	General Purpose	General Purpose	Identical
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute is compliant
REACH Status	Vendor Undefined	REACH Unaffected	Substitute is compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

The TE Connectivity 2-644861-4 is a direct functional equivalent to the obsolete 644861-4 model. Both components share identical electrical and mechanical specifications across all critical parameters including connector type, contact configuration, pitch spacing, voltage rating, and operating temperature range.

The primary advantages of selecting the 2-644861-4 substitute are:

Product Status: The substitute part is classified as active, ensuring continued availability and supply chain reliability for new production and maintenance applications.

Regulatory Compliance: The 2-644861-4 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original 644861-4 is RoHS non-compliant, which may restrict its use in regulated applications and markets.

Contact Finish: The substitute features pure tin contact finish compared to the tin-lead finish of the original part. Tin finish provides equivalent electrical performance and is compatible with modern soldering processes and lead-free manufacturing standards.

Packaging: The substitute is available in bulk packaging with higher inventory levels (2200 pieces in stock versus 925 pieces), supporting larger production volumes and reducing procurement lead times.

Both parts are suitable for board-to-cable/wire applications requiring shrouded 4-position headers with through-hole mounting and friction lock fastening. The electrical and mechanical compatibility is complete, allowing direct substitution without circuit redesign or mechanical modification.

Frequently Asked Questions (FAQ)

Q: Can the 2-644861-4 be used as a direct replacement for the 644861-4 in existing designs?

A: Yes. The 2-644861-4 maintains full electrical and mechanical compatibility with the 644861-4 across all critical parameters including connector type, position count, pitch spacing, voltage rating, operating temperature range, and mounting configuration. Direct substitution is supported without design modification.

Q: What is the difference between the tin-lead finish on the original part and the tin finish on the substitute?

A: Both finishes provide equivalent electrical conductivity and contact reliability. Tin finish is compatible with lead-free soldering processes and modern manufacturing standards. Tin-lead finish is an older specification. The functional performance in the application is identical.

Q: Why is the original 644861-4 classified as obsolete?

A: The 644861-4 is no longer in active production. The 2-644861-4 is the current active equivalent that replaces it in the product line. Obsolete status indicates the part is being phased out in favor of the newer variant.

Q: Are there any compliance differences between the two parts?

A: Yes. The 2-644861-4 is ROHS3 compliant and REACH unaffected, meeting current environmental regulations. The original 644861-4 is RoHS non-compliant. For applications subject to regulatory requirements, the substitute is the appropriate selection.

Q: What is the difference in packaging between the two parts?

A: The original 644861-4 is supplied in standard packaging with 925 pieces in stock. The 2-644861-4 is supplied in bulk packaging with 2200 pieces in stock. Bulk packaging supports higher volume production requirements and may offer cost advantages for large orders.

Q: Are the mechanical dimensions identical between the two parts?

A: Yes. Both parts share identical contact lengths, insulation height, overall dimensions, and mounting specifications. The through-hole mounting footprint is identical, allowing direct PCB compatibility.

Q: Can the 644861-4 and 2-644861-4 be mixed in the same assembly?

A: Yes. Both parts are electrically and mechanically equivalent and can be used interchangeably in the same assembly. However, for new production, the active 2-644861-4 is the recommended selection due to product status and regulatory compliance.

Q: What is the current rating for these connectors?

A: The current rating varies by wire gauge used in the application. Both parts support the same current specifications based on the wire gauge selected. Refer to wire gauge specifications for specific current capacity.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the 644861-4 and 2-644861-4 operate across the identical temperature range of -55°C to 105°C, supporting applications in industrial, automotive, and consumer electronics environments.

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