3M 3408-2603 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3408-2603 is a through-hole rectangular connector header with 16 positions arranged in 2 rows at 0.100" (2.54mm) pitch. This connector features shrouded 3-wall design with latch lock/eject hooks and is rated for 1A per contact at operating temperatures from -55°C to 105°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	16
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Shrouding	Shrouded - 3 Wall
Fastening Type	Latch Lock/Eject Hooks, Long
Current Rating	1A
Operating Temperature	-55°C ~ 105°C
Contact Finish - Mating	Gold
Contact Finish - Post	Tin-Lead
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the 3408-2603 is determined by the following critical parameters: 16-position, 2-row configuration at 0.100" (2.54mm) pitch, through-hole solder termination, male pin contact type, and shrouded design with latch fastening. Substitute parts must maintain these core electrical and mechanical specifications to ensure PCB compatibility and mating interface integrity.

The substitute parts are grouped into two categories:

Category 1: 3M Active Alternatives (Same Manufacturer) Parts D3408-6002-AR and N3408-6002RB maintain the 16-position, 2-row, 2.54mm pitch configuration with through-hole solder termination. These parts feature upgraded shrouding (4-wall vs. 3-wall) and push-pull fastening, with higher current ratings (1.75A) and improved RoHS compliance status.

Category 2: TE Connectivity AMP-Latch Series Parts 102321-3, 5102321-3, 2-5499206-3, 499206-3, and 5499206-3 maintain the 16-position, 2-row, 2.54mm pitch specification with latch lock/eject hook fastening matching the original design. These parts operate across -65°C to 105°C and carry 250VAC voltage rating with UL94 V-0 flammability compliance.

Category 3: Amphenol ICC Quickie™ Series Parts 53611-G16-4LF and 53611-S16-4LF provide 16-position, 2-row, 2.54mm pitch headers with latch lock/eject hook fastening and thermoplastic insulation. These parts feature phosphor bronze contacts with gold or gold GXT™ mating finish.

Parameter Comparison

Part Number	Manufacturer	Positions	Rows	Pitch (mm)	Shrouding	Fastening Type	Current Rating (A)	Operating Temp (°C)	Contact Finish - Mating	Contact Finish - Post	RoHS Status	Product Status
3408-2603	3M	16	2	2.54	Shrouded - 3 Wall	Latch Lock/Eject Hooks, Long	1	-55 ~ 105	Gold	Tin-Lead	RoHS non-compliant	Obsolete
D3408-6002-AR	3M	16	2	2.54	Shrouded - 4 Wall	Push-Pull	1.75	-55 ~ 105	Gold	Tin	ROHS3 Compliant	Active
N3408-6002RB	3M	16	2	2.54	Shrouded - 4 Wall	Push-Pull	1.75	-55 ~ 105	Gold	Tin	RoHS Compliant	Active
102321-3	TE Connectivity AMP Connectors	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks, Long	1	-65 ~ 105	Gold or Gold-Palladium	Tin-Lead	RoHS non-compliant	Active
5102321-3	TE Connectivity AMP Connectors	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks, Long	1	-65 ~ 105	Gold or Gold-Palladium	Tin	ROHS3 Compliant	Active
2-5499206-3	TE Connectivity AMP Connectors	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks, Long	1	-65 ~ 105	Gold or Gold-Palladium	Tin	ROHS3 Compliant	Active
499206-3	TE Connectivity AMP Connectors	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks, Long	1	-65 ~ 105	Gold or Gold-Palladium	Tin-Lead	RoHS non-compliant	Active
499922-3	TE Connectivity AMP Connectors	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks, Long	1	-65 ~ 105	Gold or Gold-Palladium	Tin-Lead	Not applicable	Active
5499206-3	TE Connectivity AMP Connectors	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks, Long	1	-65 ~ 105	Gold or Gold-Palladium	Tin	RoHS Compliant	Active
53611-G16-4LF	Amphenol ICC (FCI)	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks	—	—	Gold or Gold, GXT™	Tin	RoHS Compliant	Active
53611-S16-4LF	Amphenol ICC (FCI)	16	2	2.54	Shrouded - 4 Wall	Latch Lock/Eject Hooks	—	—	Gold or Gold, GXT™	Tin	RoHS Compliant	Active

Engineering Selection Recommendations

For RoHS Compliance Requirements: Select D3408-6002-AR, N3408-6002RB, 5102321-3, 2-5499206-3, 5499206-3, 53611-G16-4LF, or 53611-S16-4LF. These parts carry active RoHS3 or RoHS compliant status, addressing regulatory requirements for new designs.

For Latch Lock/Eject Hook Fastening Retention: TE Connectivity AMP-Latch series (102321-3, 5102321-3, 2-5499206-3, 499206-3, 499922-3, 5499206-3) and Amphenol ICC Quickie™ series (53611-G16-4LF, 53611-S16-4LF) maintain the original latch lock/eject hook fastening mechanism, ensuring mechanical compatibility with existing mating connectors.

For Active Product Status and Inventory Availability: All substitute parts listed carry active product status with confirmed inventory levels ranging from 773 to 3626 pieces. N3408-6002RB and 5499206-3 offer the highest inventory availability at 773 and 3626 pieces respectively.

For Extended Temperature Range: TE Connectivity AMP-Latch series parts operate across -65°C to 105°C, providing 10°C lower minimum temperature specification compared to the original 3408-2603 (-55°C to 105°C).

For Current Rating Enhancement: 3M D3408-6002-AR and N3408-6002RB provide 1.75A current rating, exceeding the original 1A specification while maintaining the same operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can D3408-6002-AR or N3408-6002RB be used as direct replacements for 3408-2603?

A: Both parts maintain the 16-position, 2-row, 0.100" (2.54mm) pitch configuration with through-hole solder termination and male pin contacts. However, fastening type differs: D3408-6002-AR and N3408-6002RB use push-pull fastening versus the original latch lock/eject hooks. This requires verification that mating connectors are compatible with push-pull engagement. Current rating increases to 1.75A, which is compatible with designs rated for 1A operation.

Q: What is the difference between TE Connectivity 102321-3 and 5102321-3?

A: Both maintain identical 16-position, 2-row, 2.54mm pitch configuration with latch lock/eject hook fastening. Primary differences are contact finish post material (102321-3 uses Tin-Lead; 5102321-3 uses Tin) and RoHS compliance status (102321-3 is RoHS non-compliant; 5102321-3 is ROHS3 compliant). Select 5102321-3 for designs requiring RoHS3 compliance.

Q: Are Amphenol ICC 53611-G16-4LF and 53611-S16-4LF interchangeable?

A: Both parts share identical 16-position, 2-row, 2.54mm pitch, shrouded 4-wall design, and latch lock/eject hook fastening. The primary difference is contact finish thickness on the mating surface: 53611-G16-4LF specifies 30.0µin (0.76µm) gold finish, while 53611-S16-4LF specifies 15.0µin (0.38µm). Selection depends on contact wear and durability requirements for the application.

Q: What packaging options are available for substitute parts?

A: 3M D3408-6002-AR is supplied in Tray packaging. N3408-6002RB is supplied in Bulk packaging. TE Connectivity AMP-Latch series parts (102321-3, 5102321-3, 2-5499206-3, 499206-3, 499922-3, 5499206-3) are supplied in Tray packaging. Amphenol ICC Quickie™ series (53611-G16-4LF, 53611-S16-4LF) are supplied in Tray packaging. Confirm packaging requirements with procurement specifications.

Q: Which substitute part offers the best inventory availability?

A: TE Connectivity 5499206-3 offers the highest inventory level at 3626 pieces. 3M D3408-6002-AR provides 6514 pieces in stock. Both parts are suitable for high-volume procurement requirements.

Q: Are all substitute parts rated for 250VAC operation?

A: TE Connectivity AMP-Latch series parts (102321-3, 5102321-3, 2-5499206-3, 499206-3, 499922-3, 5499206-3) carry 250VAC voltage rating. 3M parts (D3408-6002-AR, N3408-6002RB) and Amphenol ICC Quickie™ series do not specify voltage rating in the provided data. Confirm voltage requirements with application specifications before selection.

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