3M 951256-2520-AR-TP Rectangular Connector Header: Equivalent & Substitute Parts

Part Overview

The 3M 951256-2520-AR-TP is a surface mount rectangular connector header with 56 positions arranged in 2 rows at 2.00mm pitch. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The connector features male pins with gold-plated mating contacts, solder termination, and push-pull fastening suitable for board-to-board interconnection in compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	951256-2520-AR-TP
Manufacturer	3M
Category	Rectangular Connectors
Connector Type	Header
Contact Type	Male Pin
Number of Positions	56
Number of Rows	2
Pitch - Mating	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Surface Mount
Termination	Solder
Fastening Type	Push-Pull
Contact Shape	Square
Contact Finish - Mating	Gold
Insulation Material	Thermoplastic
Operating Temperature	-25°C ~ 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 3M 951256-2520-AR-TP must satisfy the following core electrical and mechanical parameters:

56 positions in 2-row configuration
2.00mm (0.079") pitch spacing
Surface mount solder termination
Male pin contact type with square contact shape
Gold-plated mating contacts
Push-pull fastening mechanism
UL94 V-0 flammability rating
MSL 1 (Unlimited) moisture sensitivity

All Samtec MMT-128 series variants listed meet these core requirements. Variations within the substitute group differ in contact finish thickness (3.00µin vs. 10.0µin gold plating), insulation material (LCP vs. thermoplastic), contact material (phosphor bronze vs. copper alloy), and optional mechanical features (board guide, board lock, pick-and-place compatibility). These variations do not affect fundamental substitutability for the primary connector function.

Parameter Comparison

Parameter	3M 951256-2520-AR-TP	Samtec MMT-128-01-F-DV	Samtec MMT-128-01-L-DV	Samtec MMT-128-01-F-DV-A-P	Samtec MMT-128-01-L-DV-A-P	Samtec MMT-128-01-F-DV-LC-P	Samtec MMT-128-01-L-DV-LC-P
Manufacturer	3M	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Number of Positions	56	56	56	56	56	56	56
Number of Rows	2	2	2	2	2	2	2
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Shape	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness - Mating	Flash	3.00µin (0.076µm)	10.0µin (0.25µm)	3.00µin (0.076µm)	10.0µin (0.25µm)	3.00µin (0.076µm)	10.0µin (0.25µm)
Contact Material	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Thermoplastic	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-25°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating (Amps)	1A	3A	3A	3A	3A	3A	3A
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All Samtec MMT-128 series variants provide direct functional substitution for the obsolete 3M 951256-2520-AR-TP. The substitute parts offer enhanced specifications including extended operating temperature range (-55°C to 125°C vs. -25°C to 105°C), higher current rating (3A vs. 1A), and active product status with ongoing manufacturer support.

Selection among MMT-128 variants depends on application-specific requirements:

MMT-128-01-F-DV and MMT-128-01-L-DV serve as baseline substitutes with minimal feature additions. The primary difference between these two is contact finish thickness: F-series provides 3.00µin gold plating while L-series provides 10.0µin gold plating for enhanced durability in high-cycle mating applications.

MMT-128-01-F-DV-A-P and MMT-128-01-L-DV-A-P include board guide and pick-and-place features, supporting automated assembly processes.

MMT-128-01-F-DV-LC-P and MMT-128-01-L-DV-LC-P incorporate board lock and pick-and-place features for applications requiring mechanical retention during assembly.

MMT-128-01-F-DV-A-TR and MMT-128-01-L-DV-A-TR provide board guide without pick-and-place capability.

MMT-128-01-F-DV-LC-TR and MMT-128-01-L-DV-LC-TR provide board lock without pick-and-place capability.

All substitute parts maintain UL94 V-0 flammability compliance and MSL 1 moisture sensitivity rating. Samtec MMT-128 series parts are ROHS3 compliant, supporting regulatory requirements for new designs.

Frequently Asked Questions (FAQ)

Q: Can Samtec MMT-128 series connectors directly replace the 3M 951256-2520-AR-TP in existing designs?

A: Yes. All MMT-128 variants maintain identical pitch (2.00mm), position count (56 in 2 rows), contact type (male pin), mounting method (surface mount), and termination (solder). Mechanical and electrical compatibility is established through these core parameters.

Q: What is the difference between F-series and L-series contact finishes?

A: F-series (MMT-128-01-F-DV variants) provides 3.00µin (0.076µm) gold plating on mating contacts. L-series (MMT-128-01-L-DV variants) provides 10.0µin (0.25µm) gold plating. The thicker L-series finish extends contact life in high-cycle mating applications. Both meet the same electrical performance requirements.

Q: Do the optional features (board guide, board lock, pick-and-place) affect connector compatibility?

A: No. Optional mechanical features such as board guide, board lock, and pick-and-place compatibility do not alter the electrical or primary mechanical interface. These features support manufacturing processes and assembly automation but do not impact mating or electrical performance.

Q: What is the significance of the extended operating temperature range in Samtec substitutes?

A: Samtec MMT-128 series operates from -55°C to 125°C compared to the 3M original specification of -25°C to 105°C. This extended range provides design margin for applications subject to thermal cycling or extreme environmental conditions. Applications within the original temperature range experience no performance change.

Q: Are all MMT-128 variants ROHS3 compliant?

A: Yes. All listed Samtec MMT-128 variants are ROHS3 compliant, supporting regulatory requirements for products marketed in regions with RoHS directives.

Q: What inventory levels are available for these substitute parts?

A: Samtec MMT-128 series variants maintain active production status with inventory ranging from 622 to 1115 pieces across the listed part numbers, providing supply continuity for production and maintenance applications.

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