951125-4620-AR-TP Equivalent & Substitute Parts

Part Overview

The 951125-4620-AR-TP is a rectangular connector header manufactured by 3M, designed for surface mount, right-angle board-to-board applications with 25 positions at 0.079" (2.00mm) pitch. This connector operates within the temperature range of -25°C to 105°C and carries a current rating of 1A per contact. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.079" (2.00mm)
Number of Positions	25
Number of Rows	1
Mounting Type	Surface Mount, Right Angle
Termination	Solder
Fastening Type	Push-Pull
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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 951125-4620-AR-TP are identified based on matching the following critical parameters:

Connector type: Header
Contact type: Male Pin
Pitch - Mating: 0.079" (2.00mm)
Number of positions: 25
Number of rows: 1
Mounting type: Surface Mount, Right Angle
Termination: Solder
Fastening type: Push-Pull
Contact finish - Mating: Gold
Material flammability rating: UL94 V-0
Moisture sensitivity level: 1 (Unlimited)

The Samtec MMT-125-01-L-SH and MMT-125-01-L-SH-A meet these core substitution criteria. Both are active products with enhanced electrical performance characteristics and extended operating temperature ranges compared to the obsolete 3M part.

Parameter Comparison

Parameter	951125-4620-AR-TP (3M)	MMT-125-01-L-SH (Samtec)	MMT-125-01-L-SH-A (Samtec)
Manufacturer	3M	Samtec Inc.	Samtec Inc.
Product Status	Obsolete	Active	Active
Connector Type	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Number of Positions	25	25	25
Number of Rows	1	1	1
Mounting Type	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle
Termination	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.175" (4.45mm)	0.126" (3.20mm)	0.126" (3.20mm)
Insulation Height	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Contact Shape	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold
Contact Finish Thickness - Mating	Flash	10.0µin (0.25µm)	10.0µin (0.25µm)
Contact Material	Copper Alloy	Phosphor Bronze	Phosphor Bronze
Insulation Material	Thermoplastic	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-25°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Black	Black	Black
Current Rating	1A	3A	3A
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Packaging	Not specified	Not specified	Tube
Features	Not specified	Not specified	Board Guide

Engineering Selection Recommendations

Both Samtec MMT-125 series connectors (MMT-125-01-L-SH and MMT-125-01-L-SH-A) are direct functional substitutes for the obsolete 3M 951125-4620-AR-TP. Selection between the two Samtec options depends on packaging and mechanical requirements:

MMT-125-01-L-SH is suitable for applications requiring standard packaging and baseline performance specifications.

MMT-125-01-L-SH-A includes board guide features and is supplied in tube packaging, providing enhanced mechanical alignment during assembly. This variant is recommended for applications where board-level guidance improves manufacturing reliability.

Both substitute parts offer superior electrical performance with 3A current rating versus the original 1A specification, extended operating temperature range (-55°C to 125°C versus -25°C to 105°C), and ROHS3 compliance. The Samtec parts utilize Liquid Crystal Polymer insulation material and Phosphor Bronze contacts, providing improved durability compared to the thermoplastic and copper alloy construction of the original part.

Frequently Asked Questions (FAQ)

Q: Can MMT-125-01-L-SH and MMT-125-01-L-SH-A be used interchangeably with 951125-4620-AR-TP?

A: Yes. Both Samtec parts meet the core electrical and mechanical specifications of the 3M connector. The primary difference is packaging and the board guide feature on the -A variant. Selection depends on assembly process requirements and mechanical alignment needs.

Q: What is the difference between MMT-125-01-L-SH and MMT-125-01-L-SH-A?

A: MMT-125-01-L-SH-A includes a board guide feature and is supplied in tube packaging. MMT-125-01-L-SH uses standard packaging without the board guide. Both are electrically and mechanically equivalent for mating with standard 25-position 2.00mm pitch receptacles.

Q: Are there any mechanical compatibility concerns with the contact length difference?

A: The substitute parts have a mating contact length of 0.126" (3.20mm) compared to 0.175" (4.45mm) on the original part. This difference is within acceptable tolerance for standard 2.00mm pitch connector systems and does not affect functional compatibility with standard receptacles.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. Both MMT-125 variants maintain UL94 V-0 flammability rating and MSL 1 (Unlimited) moisture sensitivity level. Additionally, both are ROHS3 compliant, providing enhanced environmental compliance compared to the original part.

Q: What is the current rating difference, and does it affect compatibility?

A: The substitute parts are rated for 3A per contact versus 1A on the original part. This higher rating provides additional design margin and does not create compatibility issues. Existing designs operating at 1A or below will function without modification.

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