3M 951272-2520-AR-TP Equivalent & Substitute Parts

Part Overview

The 3M 951272-2520-AR-TP is a surface mount rectangular connector header with 72 positions at 2.00mm pitch, designed for board-to-board applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 3M 951 series connectors are no longer actively manufactured, requiring engineers to identify functionally compatible alternatives from active product lines.

Key Parameters

Parameter	Value
Connector Type	Header, Male Pin
Number of Positions	72
Number of Rows	2
Pitch - Mating	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Surface Mount
Termination	Solder
Contact Shape	Square
Insulation Material	Thermoplastic (3M) / Liquid Crystal Polymer (Samtec)
Operating Temperature Range	-25°C ~ 105°C (3M) / -55°C ~ 125°C (Samtec)
Current Rating	1A (3M) / 3A (Samtec)
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete (3M) / Active (Samtec)

Substitute Part Grouping Explanation

Samtec MMT-136 series connectors serve as direct functional substitutes for the 3M 951272-2520-AR-TP based on the following critical parameters:

Matching Parameters (Substitution Basis):

Connector type: Header with male pins
Position count: 72 positions in 2-row configuration
Pitch specification: 0.079" (2.00mm) mating pitch and row spacing
Mounting method: Surface mount with solder termination
Contact geometry: Square contact shape
Fastening type: Push-pull mechanism
Shrouding: Unshrouded design
Flammability rating: UL94 V-0 compliance

Differentiating Parameters (Feature Variants): The Samtec MMT-136 line includes variants distinguished by:

Contact finish thickness (3.00µin vs. 10.0µin gold plating)
Mechanical features (Board Guide, Board Lock, Pick and Place capability)
Packaging configuration (Bulk vs. standard)
Tape and reel availability (TR designation)

All MMT-136 variants maintain electrical and mechanical compatibility with the original 3M part while offering enhanced performance characteristics including extended operating temperature range (-55°C to 125°C) and increased current rating (3A vs. 1A).

Parameter Comparison

Parameter	3M 951272-2520-AR-TP	Samtec MMT-136-01-F-DV	Samtec MMT-136-01-L-DV	Samtec MMT-136-01-F-DV-A-P	Samtec MMT-136-01-L-DV-A-P
Manufacturer	3M	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Number of Positions	72	72	72	72	72
Number of Rows	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)
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Termination	Solder	Solder	Solder	Solder	Solder
Contact Length - Mating	0.157" (4.00mm)	0.126" (3.20mm)	0.126" (3.20mm)	0.126" (3.20mm)	0.126" (3.20mm)
Insulation Height	0.060" (1.52mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Contact Finish - Mating	Gold (Flash)	Gold (3.00µin)	Gold (10.0µin)	Gold (3.00µin)	Gold (10.0µin)
Contact Material	Copper Alloy	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)
Operating Temperature	-25°C ~ 105°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
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Black	Black	Black	Black	Black
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: Samtec MMT-136-01-L-DV or MMT-136-01-L-DV-A-P

The MMT-136-01-L-DV series with 10.0µin (0.25µm) gold plating provides the most direct functional replacement. The extended gold contact finish thickness offers superior corrosion resistance and contact reliability compared to the 3.00µin flash plating variants. The -L designation indicates this enhanced plating specification.

For Pick-and-Place Assembly: Samtec MMT-136-01-L-DV-A-P or MMT-136-01-L-DV-LC-P

Applications requiring automated assembly benefit from the board guide and pick-and-place features. The -A-P suffix indicates board guide with pick-and-place capability, while -LC-P adds board lock functionality for enhanced mechanical retention during assembly and mating cycles.

For Tape-and-Reel Packaging: Samtec MMT-136-01-L-DV-A-TR or MMT-136-01-L-DV-LC-TR

High-volume production environments requiring tape-and-reel packaging should specify the -TR variants. These maintain all electrical and mechanical specifications while providing standard reel packaging for automated placement equipment.

Compliance Considerations:

All Samtec MMT-136 variants maintain UL94 V-0 flammability compliance and MSL 1 moisture sensitivity rating, matching the original 3M specification. Samtec parts carry ROHS3 compliance certification, providing regulatory advantage for new designs and updated product lines.

Performance Enhancement:

Samtec MMT-136 substitutes provide measurable performance improvements: extended operating temperature range (-55°C to 125°C vs. -25°C to 105°C) and tripled current rating (3A vs. 1A). These enhancements support higher-reliability applications and thermal stress environments without design modification.

Frequently Asked Questions (FAQ)

Q: Are Samtec MMT-136 connectors mechanically compatible with the 3M 951272-2520-AR-TP footprint?

A: Yes. Both connector families maintain identical 72-position configuration, 2.00mm pitch spacing, and square contact geometry. PCB footprints are compatible. Minor differences exist in contact length (3.20mm vs. 4.00mm mating length) and insulation height (2.00mm vs. 1.52mm), which do not affect mating compatibility but may require verification in space-constrained applications.

Q: What is the difference between MMT-136-01-F-DV and MMT-136-01-L-DV?

A: The primary difference is contact finish thickness. The -F variant specifies 3.00µin (0.076µm) gold plating, while the -L variant specifies 10.0µin (0.25µm) gold plating. The thicker -L plating provides enhanced durability and corrosion resistance for applications requiring extended service life or harsh environmental exposure.

Q: Can I use MMT-136 variants with different feature suffixes interchangeably?

A: Electrically and mechanically, yes. All MMT-136-01 variants maintain identical electrical performance and mating characteristics. Feature differences (-A-P for board guide/pick-and-place, -LC-P for board lock/pick-and-place, -LC-TR for board lock/tape-reel) are assembly and packaging options that do not affect connector function. Selection depends on manufacturing process requirements and packaging needs.

Q: Does the Samtec MMT-136 support the same current rating as the 3M 951272-2520-AR-TP?

A: No. The Samtec MMT-136 is rated for 3A per contact, while the 3M original is rated for 1A. This represents a performance improvement. Applications designed for 1A operation remain fully compatible. Applications requiring higher current capacity benefit from the increased rating without design modification.

Q: Are there tape-and-reel packaging options available?

A: Yes. Samtec offers -TR variants (MMT-136-01-F-DV-A-TR, MMT-136-01-L-DV-A-TR, MMT-136-01-F-DV-LC-TR, MMT-136-01-L-DV-LC-TR) in standard tape-and-reel packaging for automated assembly lines. Standard packaging is also available for manual or semi-automated processes.

Q: What is the operating temperature range difference, and does it affect compatibility?

A: The 3M original operates -25°C to 105°C, while Samtec MMT-136 operates -55°C to 125°C. This extended range in the substitute part provides additional thermal margin and supports applications in extreme temperature environments. Existing designs operating within the original temperature range remain fully compatible.

Q: Is RoHS compliance important for my application?

A: Samtec MMT-136 connectors carry ROHS3 compliance certification. If your application or regulatory environment requires RoHS compliance, the Samtec substitutes meet this requirement. The 3M original specification does not indicate RoHS status.

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