3M 3408-6003 Rectangular Connector Header Equivalent & Substitute Parts

Part Overview

The 3M 3408-6003 is a through-hole rectangular connector header with 16 positions at 2.54mm pitch, featuring shrouded 4-wall design and push-pull fastening. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain design compatibility and ensure continued component availability for production and repair applications.

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
Shrouding	Shrouded - 4 Wall
Fastening Type	Push-Pull
Termination	Solder
Operating Temperature Range	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0
Current Rating	1A
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 3M 3408-6003 is determined by the following critical parameters: 16-position, 2-row configuration at 0.100" (2.54mm) pitch, through-hole mounting, shrouded 4-wall design, push-pull fastening, solder termination, and male pin contact type. All substitute parts listed maintain these core electrical and mechanical specifications.

Substitute parts are grouped into two categories based on product status and compliance:

Active Status Substitutes (Recommended for New Designs):

D3408-6002-AR (3M D3000 Series, ROHS3 Compliant)
N3408-6002RB (3M 3000 Series, RoHS Compliant)
71918-016LF (Amphenol ICC Quickie™ Series, RoHS Compliant)
CWN-350-16-0021 (CW Industries CWN Series, ROHS3 Compliant)
CWN-351-16-0000 (CW Industries CWN Series, ROHS3 Compliant)
CWN-351-16-0021 (CW Industries CWN Series, ROHS3 Compliant)
CWN-352-16-0021 (CW Industries CWN Series, ROHS3 Compliant)
CWN-360-16-0000 (CW Industries CWN Series, ROHS3 Compliant)
CWN-360-16-0021 (CW Industries CWN Series, ROHS3 Compliant)
CWN-361-16-0000 (CW Industries CWN Series, ROHS3 Compliant)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Product Status	Positions	Pitch (mm)	Fastening Type	Contact Material	Operating Temp (°C)	Current Rating (A)	RoHS Status	Inventory (Pcs)
3408-6003	3M	3000	Obsolete	16	2.54	Push-Pull	Copper Alloy	-55 ~ 105	1	Non-compliant	781
D3408-6002-AR	3M	D3000	Active	16	2.54	Push-Pull	Brass	-55 ~ 105	1.75	ROHS3 Compliant	6514
N3408-6002RB	3M	3000	Active	16	2.54	Push-Pull	Copper Alloy	-55 ~ 105	1.75	RoHS Compliant	773
71918-016LF	Amphenol ICC (FCI)	Quickie™	Active	16	2.54	Push-Pull	Phosphor Bronze	Not specified	Not specified	RoHS Compliant	882
CWN-350-16-0021	CW Industries	CWN	Active	16	2.54	Push-Pull	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	967
CWN-351-16-0000	CW Industries	CWN	Active	16	2.54	Latch Lock/Eject Hooks, Short	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	669
CWN-351-16-0021	CW Industries	CWN	Active	16	2.54	Latch Lock/Eject Hooks, Short	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	951
CWN-352-16-0021	CW Industries	CWN	Active	16	2.54	Latch Lock/Eject Hooks, Long	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	975
CWN-360-16-0000	CW Industries	CWN	Active	16	2.54	Push-Pull	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	996
CWN-360-16-0021	CW Industries	CWN	Active	16	2.54	Push-Pull	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	1086
CWN-361-16-0000	CW Industries	CWN	Active	16	2.54	Latch Lock/Eject Hooks, Short	Phosphor Bronze	-55 ~ 125	1	ROHS3 Compliant	879

Engineering Selection Recommendations

For applications requiring direct replacement of the 3M 3408-6003, the D3408-6002-AR and N3408-6002RB are the primary alternatives from 3M, maintaining the same series heritage and contact material compatibility. Both parts are active products with ROHS3 or RoHS compliance, addressing regulatory requirements for new designs.

The Amphenol ICC 71918-016LF (Quickie™ Series) provides an alternative from a major connector manufacturer with RoHS compliance and active product status. This part is suitable for applications where cross-manufacturer qualification is acceptable.

CW Industries CWN series parts (CWN-350-16-0021, CWN-360-16-0000, CWN-360-16-0021) offer push-pull fastening identical to the original 3408-6003, with extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. These parts are recommended for applications requiring enhanced thermal performance.

CW Industries parts with latch lock/eject hook fastening (CWN-351-16-0000, CWN-351-16-0021, CWN-352-16-0021, CWN-361-16-0000) provide alternative fastening mechanisms suitable for applications requiring positive mating assurance. These parts maintain the same pitch, position count, and electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct drop-in replacement for the 3M 3408-6003?

A: Direct mechanical and electrical compatibility is maintained across all listed substitute parts for the core 16-position, 2.54mm pitch, through-hole configuration. However, fastening type differences must be considered. Parts with push-pull fastening (D3408-6002-AR, N3408-6002RB, 71918-016LF, CWN-350-16-0021, CWN-360-16-0000, CWN-360-16-0021) are closest to the original. Parts with latch lock/eject hook fastening require mating connector compatibility verification.

Q: What is the difference between push-pull and latch lock/eject hook fastening?

A: Push-pull fastening uses a simple push-to-mate and pull-to-disconnect mechanism. Latch lock/eject hook fastening provides positive mating assurance through mechanical hooks that lock the mating connector in place, requiring deliberate unlatching for disconnection. Selection depends on application requirements for mating security.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are RoHS compliant (either RoHS or ROHS3 status). The original 3M 3408-6003 is marked as RoHS non-compliant. For new designs or applications subject to RoHS regulations, any of the listed active substitute parts are suitable.

Q: What is the difference between the 3M D3000 series (D3408-6002-AR) and the 3M 3000 series (N3408-6002RB)?

A: Both are 3M products with identical electrical and mechanical specifications for the 16-position, 2.54mm pitch configuration. The D3000 series uses brass contact material with higher current rating (1.75A) and ROHS3 compliance. The 3000 series uses copper alloy contact material with the same 1.75A current rating and RoHS compliance. Selection between them depends on material preference and specific compliance requirements.

Q: Can I mix and match connectors from different manufacturers in the same application?

A: All substitute parts maintain the same pitch (2.54mm), position count (16), and shrouded 4-wall design, ensuring mechanical compatibility at the board level. However, mating connector compatibility must be verified with the specific receptacle or cable assembly used in your application. Cross-manufacturer mating requires confirmation that the receptacle is designed to accept headers from multiple manufacturers.

Q: What is the significance of the contact material differences (Copper Alloy, Brass, Phosphor Bronze)?

A: Contact material affects electrical conductivity, durability, and cost. Copper alloy and brass provide good electrical properties and are commonly used in standard applications. Phosphor bronze offers enhanced durability and is often selected for applications requiring higher cycle life or more demanding environmental conditions. All materials listed are suitable for the 1A to 1.75A current ratings specified.

Q: Why do some CW Industries parts have different contact lengths?

A: Contact length variations (0.090", 0.112", 0.155") accommodate different PCB thicknesses and mating depths. The original 3408-6003 specifies 0.155" post length. CWN-350-16-0021 uses 0.090" post length, while CWN-360 series uses 0.155" post length. Verify post length compatibility with your specific PCB thickness and mating connector design.

Q: What does "Mounting Flange" mean in the features list?

A: A mounting flange is a structural feature on the connector body that provides mechanical support and alignment when mounted to a PCB. It prevents the connector from being pushed through the board during mating and provides strain relief. Most substitute parts include this feature, except certain CWN-351 and CWN-361 variants which omit it.

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