TE Connectivity 644750-4 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 644750-4 is a rectangular connector header, vertical mount, 4-position configuration with 0.156" (3.96mm) pitch spacing. This through-hole solder termination connector is part of the MTA-156 series and is classified as obsolete. The connector features unshrouded male pins with tin-plated copper alloy contacts, designed for board-to-cable/wire applications in general purpose and industrial environments.

Due to the obsolete product status of the 644750-4, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for production and repair applications.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.156" (3.96mm)
Number of Positions	4
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Shrouding	Unshrouded
Contact Finish	Tin
Operating Temperature Range	-55°C ~ 105°C
Voltage Rating	600VAC
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 644750-4 is determined by strict alignment of the following critical parameters:

Primary Matching Criteria:

Pitch spacing: 0.156" (3.96mm)
Number of positions: 4
Number of rows: 1
Connector type: Header
Contact type: Male Pin
Mounting type: Through Hole
Termination: Solder
Shrouding: Unshrouded
Contact finish: Tin
Operating temperature range: -55°C ~ 105°C
Material flammability rating: UL94 V-0
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories based on mechanical and electrical compatibility:

Category A - Direct Mechanical Equivalents: Parts with matching pitch, position count, row configuration, and contact geometry that maintain functional interchangeability in board-to-cable/wire applications.

Category B - Extended Compatibility Parts: Parts with matching core electrical and pitch specifications but with variations in contact length, stack height, or insulation material that require design verification for specific application requirements.

Parameter Comparison

Parameter	644750-4 (TE)	0026602040 (Molex)	FWJ-04-01-T-S (Samtec)	FWJ-04-02-T-S (Samtec)	HFWJ-04-01-T-S (Samtec)
Manufacturer	TE Connectivity	Molex	Samtec Inc.	Samtec Inc.	Samtec Inc.
Product Status	Obsolete	Active	Active	Active	Active
Connector Type	Header	Header	Header	Header	Header
Contact Type	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)
Number of Positions	4	4	4	4	4
Number of Rows	1	1	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Shrouding	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded
Contact Finish - Mating	Tin	Tin	Tin	Tin	Tin
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin
Operating Temperature	-55°C ~ 105°C	Not Specified	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Voltage Rating	600VAC	Not Specified	600VAC, 845VDC	600VAC, 845VDC	Not Specified
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Contact Length - Mating	0.400" (10.16mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.500" (12.70mm)	0.450" (11.43mm)
Contact Length - Post	0.175" (4.45mm)	0.140" (3.56mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)
Overall Contact Length	0.700" (17.78mm)	0.720" (18.29mm)	0.750" (19.05mm)	0.800" (20.32mm)	0.750" (19.05mm)
Insulation Height	0.125" (3.18mm)	0.130" (3.30mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)
Contact Shape	Circular	Square	Square	Square	Square
Contact Material	Copper Alloy	Not Specified	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Thermoplastic, Glass Filled	Polyester, Glass Filled	Polybutylene Terephthalate (PBT)	Polybutylene Terephthalate (PBT)	Liquid Crystal Polymer (LCP)
Insulation Color	Natural	Natural	Black	Black	Natural

Parameter	JW-04-04-T-S-270-375 (Samtec)	JW-04-04-T-S-315-300 (Samtec)	JW-04-04-T-S-390-140 (Samtec)	JW-04-04-T-S-400-140 (Samtec)	JW-04-04-T-S-420-140 (Samtec)
Manufacturer	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Product Status	Active	Active	Active	Active	Active
Number of Positions	4	4	4	4	4
Pitch	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)
Number of Rows	1	1	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Contact Finish - Post (Mating)	Tin	Tin	Tin	Tin	Tin
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Length - Overall Pin	0.735" (18.669mm)	0.705" (17.900mm)	0.620" (15.748mm)	0.630" (16.002mm)	0.640" (16.256mm)
Length - Post (Mating)	0.375" (9.525mm)	0.300" (7.620mm)	0.140" (3.556mm)	0.140" (3.556mm)	0.140" (3.556mm)
Length - Stack Height	0.270" (6.858mm)	0.315" (8.000mm)	0.390" (9.906mm)	0.400" (10.160mm)	0.410" (10.414mm)
Length - Tail	0.090" (2.286mm)	0.090" (2.286mm)	0.090" (2.286mm)	0.090" (2.286mm)	0.090" (2.286mm)
Color	Black	Black	Black	Black	Black

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

The Molex 0026602040, Samtec FWJ-04-01-T-S, and Samtec FWJ-04-02-T-S are active production parts with ROHS3 compliance and UL94 V-0 flammability ratings. These parts maintain the critical 0.156" (3.96mm) pitch, 4-position, 1-row configuration with through-hole solder termination and tin-plated contacts. The Samtec FWJ series provides operating temperature range of -55°C ~ 105°C and voltage ratings of 600VAC and 845VDC, exceeding the original 644750-4 specifications.

Extended Compatibility Substitutes (Active Status, Specialized Applications):

The Samtec HFWJ-04-01-T-S offers high-temperature performance with Liquid Crystal Polymer insulation and a current rating of 6.7A per contact. The Samtec JW series (JW-04-04-T-S variants) provides flexible stack configurations with multiple stack height and mating post length options. These parts are designed for applications requiring specific mechanical clearances or stacking requirements while maintaining the core 0.156" (3.96mm) pitch and 4-position specifications.

All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage environments.

Frequently Asked Questions (FAQ)

Q: What is the primary reason the TE Connectivity 644750-4 requires substitution?

A: The 644750-4 is classified as obsolete. Active production alternatives from Molex and Samtec provide equivalent functionality with current manufacturing support and compliance certifications.

Q: Are the Samtec FWJ-04-01-T-S and FWJ-04-02-T-S interchangeable with the 644750-4?

A: Both parts share the critical specifications: 0.156" (3.96mm) pitch, 4-position, 1-row header configuration, through-hole solder termination, unshrouded design, and tin-plated contacts. The primary difference is contact length. The FWJ-04-01-T-S has a 0.450" (11.43mm) mating contact length compared to the 644750-4's 0.400" (10.16mm). The FWJ-04-02-T-S has a 0.500" (12.70mm) mating contact length. Selection depends on the specific mating depth requirements of the application.

Q: What is the difference between the Samtec FWJ series and the JW series?

A: The FWJ series are standard headers with fixed geometry. The JW series are flex stack connectors with variable stack heights and mating post lengths, designated in the part number (e.g., JW-04-04-T-S-400-140 indicates 0.400" stack height and 0.140" mating post length). JW series parts are used when specific mechanical clearances or stacking configurations are required.

Q: Does the Molex 0026602040 have the same contact length as the 644750-4?

A: No. The Molex 0026602040 has a 0.450" (11.43mm) mating contact length and 0.140" (3.56mm) post length, compared to the 644750-4's 0.400" (10.16mm) mating contact length and 0.175" (4.45mm) post length. The overall contact length is 0.720" (18.29mm) versus 0.700" (17.78mm). These differences require verification against specific PCB and mating connector specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original 644750-4 is RoHS compliant. All parts meet the same environmental compliance standards.

Q: What is the operating temperature range for the substitute parts?

A: The Samtec FWJ series (FWJ-04-01-T-S, FWJ-04-02-T-S) and HFWJ-04-01-T-S operate at -55°C ~ 105°C, matching the original 644750-4. The Molex 0026602040 does not specify an operating temperature range. The Samtec JW series does not specify operating temperature in the provided data.

Q: What is the voltage rating for the substitute parts?

A: The Samtec FWJ series provides 600VAC and 845VDC ratings, exceeding the original 644750-4's 600VAC rating. The Molex 0026602040 and Samtec JW series do not specify voltage ratings in the provided data.

Q: Can the Samtec HFWJ-04-01-T-S be used as a direct replacement?

A: The HFWJ-04-01-T-S maintains the same pitch, position count, and contact specifications as the 644750-4. The primary difference is the insulation material (Liquid Crystal Polymer versus Thermoplastic, Glass Filled) and the specified current rating of 6.7A per contact. It is suitable for applications requiring higher current capacity or enhanced thermal performance.

Q: What is the difference between the various JW-04-04-T-S part numbers?

A: The JW series designations include stack height and mating post length specifications. For example, JW-04-04-T-S-400-140 has a 0.400" (10.160mm) stack height and 0.140" (3.556mm) mating post length. JW-04-04-T-S-270-375 has a 0.270" (6.858mm) stack height and 0.375" (9.525mm) mating post length. Selection depends on the specific mechanical clearance and stacking requirements of the application.

Q: Are the contact shapes identical between the 644750-4 and substitute parts?

A: No. The 644750-4 has circular contact shapes, while the Samtec FWJ, HFWJ, and JW series have square contact shapes. The Molex 0026602040 also has square contacts. Square contacts provide improved contact retention and are standard in modern connector designs. This difference does not affect electrical performance but may affect mechanical fit in legacy mating connectors designed for circular pins.

Q: What is the moisture sensitivity level for all parts?

A: All parts, including the original 644750-4 and all substitutes, have MSL 1 (Unlimited) moisture sensitivity ratings. This indicates no special moisture control measures are required during storage, handling, or assembly.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message