TE Connectivity 644695-8 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 644695-8 is a rectangular connector header for through-hole mounting, featuring 8 vertical positions at 0.100" (2.54mm) pitch. This connector is classified as obsolete, with 653 pieces currently in stock. The MTA-100 series header is designed for board-to-cable/wire applications with unshrouded, male pin contacts and kinked pin solder termination.

Due to the obsolete product status of the 644695-8, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and component sourcing. Active alternatives from TE Connectivity and Amphenol ICC (FCI) provide equivalent or enhanced functionality with current manufacturing availability.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	8
Pitch - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Contact Shape	Square
Insulation Material	Thermoplastic
Operating Temperature Range	-55°C ~ 105°C (main part); -65°C ~ 125°C (substitutes)
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 644695-8 is determined by the following critical parameters:

Primary Compatibility Criteria:

Number of positions: 8
Pitch - mating: 0.100" (2.54mm)
Connector type: Header
Contact type: Male pin
Mounting type: Through hole
Contact shape: Square
Insulation material: Thermoplastic
Material flammability rating: UL94 V-0
Moisture sensitivity level: 1 (Unlimited)

Secondary Variation Parameters:

Contact length (mating and post)
Overall contact length
Contact finish (Tin-Lead vs. Tin vs. Gold)
Contact material (Copper Alloy vs. Phosphor Bronze)
Fastening type (None vs. Push-Pull)
Style (Board to Cable/Wire vs. Board to Board)
Insulation color (Natural vs. Black)
Current rating (Varies by wire gauge vs. 3A per contact)
Operating temperature range (extended in substitutes)
RoHS compliance status

The 3-644695-8 (TE Connectivity) serves as the direct equivalent with active product status. Amphenol ICC (FCI) BERGSTIK® series parts (77311 base number) provide functional alternatives with enhanced specifications, including higher operating temperature ranges, improved contact finishes, and RoHS compliance.

Parameter Comparison

Parameter	644695-8	3-644695-8	77311-122-08LF	77311-124-08LF	77311-127-08LF	77311-822-08LF	77311-824-08LF	77311-827-08LF
Manufacturer	TE Connectivity	TE Connectivity	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Series	MTA-100	MTA-100	BERGSTIK®	BERGSTIK®	BERGSTIK®	BERGSTIK®	BERGSTIK®	BERGSTIK®
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Number of Positions	8	8	8	8	8	8	8	8
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Connector Type	Header	Header	Header	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Kinked Pin, Solder	Kinked Pin, Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Length - Mating	0.295" (7.49mm)	0.295" (7.49mm)	0.305" (7.75mm)	0.266" (6.75mm)	0.260" (6.60mm)	0.305" (7.75mm)	0.266" (6.75mm)	0.260" (6.60mm)
Contact Length - Post	0.110" (2.79mm)	0.110" (2.79mm)	0.120" (3.05mm)	0.114" (2.90mm)	0.105" (2.67mm)	0.120" (3.05mm)	0.114" (2.90mm)	0.105" (2.67mm)
Overall Contact Length	0.505" (12.83mm)	0.505" (12.83mm)	0.525" (13.34mm)	0.480" (12.19mm)	0.465" (11.81mm)	0.525" (13.34mm)	0.480" (12.19mm)	0.465" (11.81mm)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Tin-Lead	Tin	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™
Contact Finish Thickness - Mating	150.0µin (3.81µm)	150.0µin (3.81µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	15.0µin (0.38µm)	15.0µin (0.38µm)
Contact Material	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Natural	Natural	Black	Black	Black	Black	Black	Black
Current Rating	Varies by Wire Gauge	Varies by Wire Gauge	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact
Voltage Rating	250VAC	250VAC	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

Primary Recommendation: 3-644695-8

The 3-644695-8 from TE Connectivity is the direct equivalent to the obsolete 644695-8. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The primary distinction is the contact finish material, which changes from Tin-Lead to Tin. This part is suitable for direct replacement in existing designs without modification.

Secondary Recommendations: Amphenol ICC (FCI) BERGSTIK® Series

The BERGSTIK® series parts (77311 base number) provide functional alternatives with the following advantages:

Extended operating temperature range (-65°C to 125°C versus -55°C to 105°C)
RoHS compliance across all variants
Phosphor bronze contact material offering improved durability
Gold or tin contact finish options with varying thickness specifications
Push-pull fastening type for enhanced mechanical retention
Board-to-board style configuration

Contact Length Variants:

Three contact length options are available within the BERGSTIK® series:

0.305" (7.75mm) mating length: 77311-122-08LF (bulk, gold finish, 30.0µin), 77311-422-08LF (bag, tin finish, 78.7µin), 77311-822-08LF (bulk, gold finish, 15.0µin)
0.266" (6.75mm) mating length: 77311-124-08LF (bulk, gold finish, 30.0µin), 77311-424-08LF (bag, tin finish, 78.7µin), 77311-824-08LF (bulk, gold finish, 15.0µin)
0.260" (6.60mm) mating length: 77311-127-08LF (bulk, gold finish, 30.0µin), 77311-427-08LF (bag, tin finish, 78.7µin), 77311-827-08LF (bag, gold finish, 15.0µin)

Selection among these variants depends on specific application requirements for contact engagement depth and mating force characteristics.

Compliance Considerations:

All recommended substitutes are RoHS compliant, addressing regulatory requirements that the original 644695-8 does not meet. Applications requiring RoHS compliance must use either the 3-644695-8 or BERGSTIK® series alternatives.

Frequently Asked Questions (FAQ)

Q: Can the 3-644695-8 be used as a direct replacement for the 644695-8?

A: Yes. The 3-644695-8 maintains identical pin count (8), pitch (2.54mm), mounting type (through-hole), and contact dimensions. The primary difference is the contact finish material (Tin versus Tin-Lead) and active product status. This part is suitable for direct substitution in existing designs.

Q: What is the difference between the TE Connectivity MTA-100 series and the Amphenol ICC BERGSTIK® series?

A: Both series share the same 8-position, 2.54mm pitch header configuration. The BERGSTIK® series offers extended operating temperature range (-65°C to 125°C), phosphor bronze contacts, push-pull fastening, and RoHS compliance. The MTA-100 series uses copper alloy contacts and does not include fastening mechanisms. Selection depends on application requirements for temperature range, mechanical retention, and regulatory compliance.

Q: How do the different contact length options in the BERGSTIK® series affect compatibility?

A: Contact length determines the depth of engagement with mating connectors. The three available mating lengths (0.305", 0.266", 0.260") accommodate different PCB thicknesses and mating connector specifications. Selection must match the intended mating connector's receptacle depth. Incorrect contact length selection results in inadequate or excessive engagement.

Q: What is the significance of the contact finish thickness variations in the BERGSTIK® series?

A: Contact finish thickness affects durability and mating cycle life. The 77311-822-08LF, 77311-824-08LF, and 77311-827-08LF variants feature reduced gold finish thickness (15.0µin) compared to the 77311-122-08LF, 77311-124-08LF, and 77311-127-08LF variants (30.0µin). Thicker finishes provide extended contact life in high-cycle applications. Tin-finished variants (77311-422-08LF, 77311-424-08LF, 77311-427-08LF) offer cost reduction with 78.7µin thickness.

Q: Are the packaging differences (Bulk versus Bag) significant for component selection?

A: Packaging differences do not affect electrical or mechanical performance. Bulk packaging (77311-122-08LF, 77311-124-08LF, 77311-127-08LF, 77311-822-08LF, 77311-824-08LF) is suitable for high-volume production. Bag packaging (77311-422-08LF, 77311-424-08LF, 77311-427-08LF, 77311-827-08LF) accommodates lower-volume requirements. Selection depends on procurement volume and inventory management practices.

Q: What are the RoHS compliance implications for the 644695-8?

A: The 644695-8 is RoHS non-compliant due to its Tin-Lead contact finish. Applications subject to RoHS regulations (EU Directive 2011/65/EU and amendments) require substitution with RoHS-compliant alternatives. The 3-644695-8 (ROHS3 Compliant) and all BERGSTIK® series variants (RoHS Compliant) satisfy these requirements.

Q: Can BERGSTIK® series connectors be used in board-to-cable/wire applications like the original 644695-8?

A: BERGSTIK® series connectors are specified for board-to-board applications with push-pull fastening. While the physical dimensions and pin configuration are compatible with board-to-cable/wire applications, the push-pull fastening mechanism is designed for board-to-board mating. For board-to-cable/wire applications, the 3-644695-8 is the appropriate choice, maintaining the original unshrouded header configuration.

Q: What is the current rating difference between the 644695-8 and BERGSTIK® substitutes?

A: The 644695-8 current rating varies by wire gauge, dependent on the external cable specification. BERGSTIK® series parts specify 3A per contact as a fixed rating. Applications requiring current ratings exceeding 3A per contact must use the 644695-8 or 3-644695-8 with appropriately sized wire gauge. For applications within the 3A per contact specification, BERGSTIK® variants are suitable.

Q: Are there any mechanical compatibility issues when substituting BERGSTIK® connectors for the original 644695-8?

A: BERGSTIK® connectors feature push-pull fastening and board-to-board style configuration, whereas the 644695-8 is an unshrouded header for board-to-cable/wire applications. Physical pin spacing and pitch are identical (2.54mm), but the fastening mechanism and intended mating style differ. Direct mechanical substitution in existing board-to-cable/wire designs requires evaluation of the mating connector type and fastening requirements.

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