3M 3431-2002 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3431-2002 is a shrouded rectangular connector header designed for through-hole mounting in board-to-board or cable applications. This connector features 34 positions arranged in 2 rows with 0.100" (2.54mm) pitch spacing. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	34
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Shrouding	Shrouded - 3 Wall
Termination	Solder
Operating Temperature Range	-55°C ~ 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3M 3431-2002 is determined by the following critical parameters:

Connector type, contact type, and gender (Header, Male Pin)
Position count and row configuration (34 positions, 2 rows)
Mating pitch and row spacing (0.100" / 2.54mm)
Mounting method (Through Hole)
Termination type (Solder)
Fastening mechanism (Push-Pull)
Operating temperature range (-55°C ~ 105°C minimum)
Flammability rating (UL94 V-0)

Three substitute parts meet these core electrical and mechanical compatibility criteria:

D3431-6002-AR (3M) - Active status, enhanced current rating, improved RoHS compliance
N3431-6002RB (3M) - Active status, same series lineage, RoHS3 compliant
CWN-350-34-0021 (CW Industries) - Active status, extended temperature range, alternative manufacturer

Parameter Comparison

Parameter	3431-2002	D3431-6002-AR	N3431-6002RB	CWN-350-34-0021
Manufacturer	3M	3M	3M	CW Industries
Product Status	Obsolete	Active	Active	Active
Connector Type	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	34	34	34	34
Number of Rows	2	2	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Shrouding	Shrouded - 3 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)
Contact Length - Post	0.112" (2.84mm)	0.112" (2.84mm)	0.112" (2.84mm)	0.090" (2.29mm)
Overall Contact Length	0.652" (16.56mm)	0.652" (16.56mm)	0.652" (16.56mm)	Not specified
Insulation Height	0.680" (17.27mm)	0.680" (17.27mm)	0.680" (17.27mm)	0.681" (17.30mm)
Contact Shape	Square	Square	Square	Circular
Contact Finish - Mating	Gold	Gold	Gold	Gold
Contact Finish - Post	Tin-Lead	Tin	Tin	Nickel
Contact Material	Copper Alloy	Brass	Copper Alloy	Phosphor Bronze
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C
Current Rating (Amps)	1A	1.75A	1.75A	1A
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

D3431-6002-AR is the primary recommended substitute. This 3M part maintains the same manufacturer lineage as the obsolete 3431-2002 while offering active product status, ROHS3 compliance, and increased current rating (1.75A versus 1A). The 4-wall shrouding provides enhanced mechanical protection compared to the original 3-wall design. This part is suitable for applications requiring RoHS compliance and higher current capacity within the same form factor.

N3431-6002RB serves as an alternative 3M substitute with active status and ROHS3 compliance. This part retains the original series designation (3000) and maintains identical electrical and mechanical specifications to the 3431-2002 except for the enhanced current rating and improved shrouding. REACH unaffected status provides additional regulatory clarity for European applications.

CWN-350-34-0021 from CW Industries is an alternative-manufacturer option with active status and ROHS3 compliance. This connector extends the operating temperature range to 125°C and maintains the same core electrical specifications. The circular contact shape and different contact materials (Phosphor Bronze with Nickel finish) represent a design variation that remains mechanically and electrically compatible within the specified parameters. This option is suitable for applications requiring extended temperature performance or alternative sourcing.

All three substitutes maintain the critical compatibility parameters: 34-position, 2-row configuration; 0.100" (2.54mm) pitch; through-hole solder termination; push-pull fastening; and UL94 V-0 flammability rating.

Frequently Asked Questions (FAQ)

Q: Can D3431-6002-AR be used as a direct replacement for 3431-2002 on existing PCBs?

A: Yes. The D3431-6002-AR maintains identical mating pitch (0.100" / 2.54mm), row spacing, contact length specifications, and mounting footprint. The 4-wall shrouding provides enhanced mechanical protection without affecting PCB compatibility. The increased current rating (1.75A) is backward compatible with applications designed for 1A operation.

Q: What is the difference between the 3-wall and 4-wall shrouding on these connectors?

A: Shrouding refers to the plastic housing walls surrounding the contact array. The original 3431-2002 features 3-wall shrouding, while all substitute parts feature 4-wall shrouding. The 4-wall design provides additional mechanical support and protection to the contact array. Both configurations maintain the same mating pitch and row spacing, ensuring PCB footprint compatibility.

Q: Are there RoHS compliance differences between the substitutes?

A: Yes. The 3431-2002 is RoHS non-compliant due to its tin-lead contact finish on the post. Both D3431-6002-AR and N3431-6002RB are ROHS3 compliant with tin-only post finishes. CWN-350-34-0021 is also ROHS3 compliant with nickel post finish. For applications requiring RoHS compliance, any of the three substitutes are suitable.

Q: Does the contact material difference between substitutes affect electrical performance?

A: The contact materials differ (Copper Alloy in 3431-2002 and N3431-6002RB; Brass in D3431-6002-AR; Phosphor Bronze in CWN-350-34-0021), but all materials are standard for connector applications and maintain the specified electrical characteristics within the operating parameters. Contact finish (gold mating surface) is consistent across all parts, ensuring equivalent mating performance.

Q: Can CWN-350-34-0021 be used in applications with the original -55°C to 105°C temperature range?

A: Yes. CWN-350-34-0021 extends the operating temperature range to -55°C to 125°C, which encompasses the original specification. The part is fully compatible with applications operating within the original -55°C to 105°C range.

Q: What is the significance of the contact post length difference in CWN-350-34-0021?

A: CWN-350-34-0021 has a contact post length of 0.090" (2.29mm) compared to 0.112" (2.84mm) in the other parts. This represents a design variation in the solder tail length. PCB design must accommodate this difference in pad depth or solder tail engagement. Verify PCB through-hole depth specifications before selecting this substitute.

Q: Are all substitutes available in the same packaging options?

A: No. The 3431-2002 is packaged in bulk. D3431-6002-AR and N3431-6002RB are supplied in trays. CWN-350-34-0021 is supplied in bulk. Packaging selection may affect procurement logistics and handling requirements but does not affect electrical or mechanical compatibility.

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