3M 951121-4620-AR-TP Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 951121-4620-AR-TP is a surface mount, right-angle rectangular connector header with 21 positions at 0.079" (2.00mm) pitch. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity. The connector features male pins with gold-plated mating contacts, tin-plated posts, and solder termination suitable for board-to-board applications. Current inventory of 1,024 pieces is available, though long-term sourcing requires transition to active product alternatives.

Key Parameters

Parameter	Specification
Connector Type	Header
Contact Type	Male Pin
Number of Positions	21
Pitch - Mating	0.079" (2.00mm)
Mounting Type	Surface Mount, Right Angle
Termination	Solder
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

Substitution eligibility for the 3M 951121-4620-AR-TP is determined by the following critical parameters:

Connector Type & Contact Configuration: Header with male pins
Position Count & Pitch: 21 positions at 0.079" (2.00mm) mating pitch
Mounting & Orientation: Surface mount, right-angle configuration
Termination Method: Solder termination
Contact Finish: Gold-plated mating surface
Insulation Material & Color: Black insulation
Fastening Type: Push-pull mechanism
Shrouding: Unshrouded design

The Samtec Inc. MMT series connectors (MMT-121-01-L-SH and MMT-121-01-L-SH-P) meet all critical substitution criteria. Both parts maintain identical position count, pitch, mounting type, termination method, contact finish, and fastening mechanism. Differences in contact material (phosphor bronze vs. copper alloy), insulation material (LCP vs. thermoplastic), and operating temperature range represent enhanced specifications rather than incompatibilities.

Parameter Comparison

Parameter	3M 951121-4620-AR-TP	Samtec MMT-121-01-L-SH	Samtec MMT-121-01-L-SH-P
Manufacturer	3M	Samtec Inc.	Samtec Inc.
Product Status	Obsolete	Active	Active
Connector Type	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin
Number of Positions	21	21	21
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
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 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)
Insulation Color	Black	Black	Black
Operating Temperature	-25°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating (Amps)	1A	3A	3A
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Features	-	-	Pick and Place
Inventory Status	1,024 Pcs New Original In Stock	969 Pcs New Original In Stock	827 Pcs New Original In Stock

Engineering Selection Recommendations

Both Samtec MMT-121-01-L-SH and MMT-121-01-L-SH-P connectors are direct functional equivalents to the 3M 951121-4620-AR-TP. Selection between the two Samtec options depends on manufacturing process requirements:

MMT-121-01-L-SH: Standard surface mount header suitable for manual or automated assembly processes.

MMT-121-01-L-SH-P: Includes pick-and-place feature optimization, recommended for high-volume automated assembly environments.

Both Samtec alternatives provide enhanced specifications including higher current rating (3A vs. 1A), extended operating temperature range (-55°C to 125°C vs. -25°C to 105°C), and ROHS3 compliance. The transition from the obsolete 3M part to either active Samtec equivalent ensures long-term supply chain continuity and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the Samtec MMT-121-01-L-SH directly replace the 3M 951121-4620-AR-TP in existing designs?

A: Yes. Both connectors share identical mating pitch (0.079" / 2.00mm), position count (21), mounting type (surface mount right-angle), termination method (solder), and contact configuration (male pins with gold plating). Mechanical and electrical compatibility is confirmed.

Q: What is the difference between MMT-121-01-L-SH and MMT-121-01-L-SH-P?

A: The MMT-121-01-L-SH-P includes pick-and-place feature optimization for automated assembly. Both parts are electrically and mechanically identical. Selection depends on manufacturing process requirements.

Q: Are there any performance differences between the 3M and Samtec parts?

A: The Samtec alternatives provide enhanced specifications: higher current rating (3A vs. 1A), extended operating temperature range (-55°C to 125°C vs. -25°C to 105°C), and improved contact material (phosphor bronze). These represent performance improvements, not limitations.

Q: Is RoHS compliance a consideration for this substitution?

A: The Samtec MMT series is ROHS3 compliant. If RoHS compliance is required for your application, the Samtec alternatives meet this requirement. The original 3M part does not specify RoHS status.

Q: What is the contact finish thickness difference between the parts?

A: The 3M part specifies flash gold plating on mating contacts. The Samtec parts specify 10.0µin (0.25µm) gold plating. Both provide adequate contact durability for the specified current rating and operating conditions.

Q: Can I use these connectors in high-temperature applications?

A: The Samtec MMT series supports operating temperatures to 125°C, exceeding the 3M part's 105°C maximum. For applications requiring extended temperature performance, the Samtec alternatives are suitable.

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