3M 3429-2002 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3429-2002 is a through-hole rectangular connector header with 26 positions at 2.54mm pitch, designed for board-to-board or cable interconnection applications. This component features shrouded 3-wall construction with gold-plated mating contacts and tin-lead plated posts. The part is classified as obsolete, making identification of functionally equivalent substitutes necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	26
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
Operating Temperature Range	-55°C to 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3429-2002 is determined by the following critical parameters:

Connector configuration: 26-position, 2-row header at 0.100" (2.54mm) pitch
Contact type: Male pin with square contact shape
Mounting method: Through-hole solder termination
Shrouding configuration: Minimum 3-wall shrouded design
Electrical performance: 1A minimum current rating
Environmental rating: UL94 V-0 flammability compliance
Operating temperature: -55°C to 105°C range

The following parts meet these substitution criteria:

3M 3429-6002 - Direct 3M series upgrade with 4-wall shrouding and improved insulation material
3M D3429-6002-AR - Active product status with enhanced current rating and RoHS3 compliance
3M N3429-6002RB - Active product with RoHS compliance and improved contact finish
CW Industries CWN-350-26-0021 - Cross-manufacturer equivalent with extended temperature range

Parameter Comparison

Parameter	3429-2002	3429-6002	D3429-6002-AR	N3429-6002RB	CWN-350-26-0021
Manufacturer	3M	3M	3M	3M	CW Industries
Number of Positions	26	26	26	26	26
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2	2	2
Shrouding	Shrouded - 3 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Contact Length - Mating	0.240" (6.10mm)	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)	0.112" (2.84mm)	0.090" (2.29mm)
Insulation Height	0.680" (17.27mm)	0.680" (17.27mm)	0.680" (17.27mm)	0.680" (17.27mm)	0.681" (17.30mm)
Contact Shape	Square	Square	Square	Square	Circular
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold
Contact Finish - Post	Tin-Lead	Tin-Lead	Tin	Tin	Nickel
Contact Material	Copper Alloy	Copper Alloy	Brass	Copper Alloy	Phosphor Bronze
Current Rating	1A	1A	1.75A	1.75A	1A
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Obsolete	Obsolete	Active	Active	Active

Engineering Selection Recommendations

3M 3429-6002: Recommended for direct replacement in legacy systems where RoHS non-compliance is acceptable. Maintains identical electrical and mechanical specifications to the original 3429-2002 with improved 4-wall shrouding. Obsolete status limits long-term availability.

3M D3429-6002-AR: Preferred substitute for new designs and ongoing production. Active product status ensures sustained availability. ROHS3 compliance satisfies modern regulatory requirements. Enhanced current rating of 1.75A provides design margin. Tray packaging supports production workflows.

3M N3429-6002RB: Suitable alternative with active product status and RoHS compliance. Maintains 1.75A current rating and improved contact finish specifications. Bulk packaging accommodates high-volume applications.

CW Industries CWN-350-26-0021: Cross-manufacturer option with ROHS3 compliance and extended operating temperature range to 125°C. Circular contact geometry and phosphor bronze material provide alternative contact characteristics. Reduced post length of 0.090" (2.29mm) requires PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can the 3429-2002 be directly replaced with the 3429-6002?

A: Yes. Both parts share identical connector configuration, pitch, row count, and electrical ratings. The primary difference is 4-wall versus 3-wall shrouding on the 3429-6002, which provides enhanced mechanical protection. Both are obsolete products.

Q: What is the advantage of D3429-6002-AR over the 3429-6002?

A: The D3429-6002-AR is an active product with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Current rating increases to 1.75A, and contact finish specifications improve. These factors make it the preferred choice for new designs.

Q: Are there compatibility concerns with the CWN-350-26-0021 substitute?

A: The CWN-350-26-0021 maintains 26-position, 2.54mm pitch configuration and meets electrical requirements. However, the circular contact shape differs from the square contacts of 3M parts, and post length is reduced to 0.090" (2.29mm) versus 0.112" (2.84mm). PCB hole sizing and solder joint geometry must be evaluated for compatibility.

Q: Which substitute is best for RoHS-compliant applications?

A: Both D3429-6002-AR and N3429-6002RB are RoHS-compliant. D3429-6002-AR offers ROHS3 compliance with active product status. N3429-6002RB provides RoHS compliance with equivalent electrical performance. CWN-350-26-0021 is also ROHS3 compliant.

Q: Does packaging type affect electrical or mechanical performance?

A: No. Packaging (bulk, tray) affects handling and production logistics only. Electrical and mechanical specifications remain identical across packaging variants.

Q: What is the temperature performance difference between substitutes?

A: The 3429-2002, 3429-6002, D3429-6002-AR, and N3429-6002RB operate from -55°C to 105°C. The CWN-350-26-0021 extends the upper limit to 125°C, suitable for elevated-temperature environments.

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