TE Connectivity AMP Connectors 645951-2 Equivalent & Substitute Parts

Part Overview

The TE Connectivity AMP Connectors 645951-2 is a pin receptacle connector designed to accept pin diameters of 0.020" to 0.026" (0.51mm to 0.66mm) with solder termination and no tail configuration. This component is classified as obsolete, indicating that direct procurement may face availability constraints. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring this connector type.

Key Parameters

Parameter	Value
Accepts Pin Diameter	0.020" ~ 0.026" (0.51mm ~ 0.66mm)
Tail Type	No Tail
Termination Type	Solder
Length - Overall	0.158" (4.01mm)
Mounting Hole Diameter	0.053" ~ 0.055" (1.35mm ~ 1.40mm)
Board Thickness	0.031" ~ 0.093" (0.79mm ~ 2.36mm)
Contact Material	Beryllium Copper
Series	2

Substitute Part Grouping Explanation

Substitution of the 645951-2 is determined by strict equivalence across the following critical parameters:

Pin Acceptance Compatibility: The substitute part must accept pin diameters of 0.020" to 0.026" (0.51mm to 0.66mm) to ensure mechanical fit with existing mating components.

Termination Method: Both the main part and substitute must utilize solder termination to maintain compatibility with PCB assembly processes.

Tail Configuration: The no-tail design is mandatory for applications where space constraints or board layout requirements prohibit extended tail lengths.

Mounting Hole Diameter: The mounting hole diameter range of 0.053" to 0.055" (1.35mm to 1.40mm) must be maintained for proper board mounting alignment.

Board Thickness Compatibility: The substitute must accommodate the same board thickness range of 0.031" to 0.093" (0.79mm to 2.36mm).

Contact Material: Beryllium copper contact material ensures consistent electrical and mechanical performance characteristics.

Series Classification: Series 2 designation indicates connector family compatibility and interchangeability within the TE Connectivity AMP Connectors product line.

The substitute part 5645951-2 meets all these critical parameters while offering enhanced product status and compliance certifications.

Parameter Comparison

Parameter	645951-2 (Main Part)	5645951-2 (Substitute)	Compatibility
Accepts Pin Diameter	0.020" ~ 0.026" (0.51mm ~ 0.66mm)	0.020" ~ 0.026" (0.51mm ~ 0.66mm)	Identical
Tail Type	No Tail	No Tail	Identical
Termination	Solder	Solder	Identical
Length - Overall	0.158" (4.01mm)	0.158" (4.01mm)	Identical
Mounting Hole Diameter	0.053" ~ 0.055" (1.35mm ~ 1.40mm)	0.053" ~ 0.055" (1.35mm ~ 1.40mm)	Identical
Flange Diameter	0.065" (1.65mm)	0.075" (1.91mm)	Substitute larger
Socket Depth	0.145" (3.68mm)	0.090" ~ 0.145" (2.29mm ~ 3.68mm)	Substitute range includes main part
Board Thickness	0.031" ~ 0.093" (0.79mm ~ 2.36mm)	0.031" ~ 0.093" (0.79mm ~ 2.36mm)	Identical
Contact Material	Beryllium Copper	Beryllium Copper	Identical
Series	2	2	Identical
Product Status	Obsolete	Active	Substitute actively manufactured
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current standards
Contact Finish	Tin	Gold	Substitute offers enhanced finish
Operating Temperature	Not specified	-65°C ~ 126°C	Substitute specifies range

Engineering Selection Recommendations

Primary Substitute: 5645951-2

The TE Connectivity AMP Connectors 5645951-2 is the direct substitute for the obsolete 645951-2. This substitution is supported by the following engineering factors:

Product Status: The 5645951-2 maintains active manufacturing status, ensuring reliable long-term availability and supply chain continuity compared to the obsolete 645951-2.

Compliance Certifications: The 5645951-2 is ROHS3 compliant, meeting current regulatory requirements for electronic components. The original 645951-2 is RoHS non-compliant, making the substitute the appropriate choice for applications subject to RoHS directives.

Mechanical Compatibility: All critical mechanical parameters—pin acceptance diameter, mounting hole diameter, board thickness compatibility, and overall length—are identical between the main part and substitute, ensuring direct mechanical interchangeability.

Electrical Compatibility: Both parts utilize beryllium copper contact material and Series 2 designation, maintaining electrical performance characteristics and connector family compatibility.

Contact Finish Enhancement: The 5645951-2 features a gold contact finish compared to the tin finish of the 645951-2, providing improved corrosion resistance and contact reliability.

Operating Temperature Specification: The 5645951-2 specifies an operating temperature range of -65°C to 126°C, providing defined thermal performance parameters absent in the original part specification.

Frequently Asked Questions (FAQ)

Q: Can the 5645951-2 directly replace the 645951-2 in existing designs?

A: Yes. The 5645951-2 is mechanically and electrically compatible with the 645951-2 across all critical parameters: pin acceptance diameter, mounting hole diameter, board thickness compatibility, tail configuration, and termination method. Direct substitution is supported without design modification.

Q: What is the significance of the flange diameter difference between the two parts?

A: The 645951-2 has a flange diameter of 0.065" (1.65mm), while the 5645951-2 has a flange diameter of 0.075" (1.91mm). This difference does not affect mechanical interchangeability for standard PCB mounting applications. The larger flange on the substitute provides increased surface contact area, which may improve mounting stability in certain applications.

Q: Does the socket depth difference affect compatibility?

A: The 645951-2 specifies a fixed socket depth of 0.145" (3.68mm), while the 5645951-2 specifies a range of 0.090" to 0.145" (2.29mm to 3.68mm). The substitute's range encompasses the original specification, ensuring compatibility with mating pins designed for the 645951-2.

Q: Why is the 645951-2 listed as obsolete?

A: The 645951-2 is classified as obsolete, indicating that TE Connectivity has discontinued active manufacturing. The 5645951-2 represents the current active product offering within the same connector series and should be used for new designs and component procurement.

Q: What is the impact of the contact finish difference?

A: The 645951-2 features a tin contact finish with a thickness of 150.0µin (3.81µm), while the 5645951-2 features a gold contact finish with a thickness of 30.0µin (0.76µm). Gold provides superior corrosion resistance and contact reliability, particularly in environments with moisture or corrosive atmospheres. The substitute's gold finish is suitable for applications requiring enhanced long-term contact performance.

Q: Is the 5645951-2 suitable for RoHS-compliant applications?

A: Yes. The 5645951-2 is ROHS3 compliant, meeting current RoHS directives. The original 645951-2 is RoHS non-compliant. For applications subject to RoHS requirements, the 5645951-2 is the appropriate selection.

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

A: The 645951-2 packaging is not specified in the available data. The 5645951-2 is supplied in bulk packaging. Confirm packaging requirements with your procurement specifications.

Q: What is the Moisture Sensitivity Level (MSL) for both parts?

A: Both the 645951-2 and 5645951-2 have an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints for storage and handling.

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