3M 3429-6003 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3429-6003 is a shrouded rectangular connector header for through-hole mounting with 26 positions at 0.100" (2.54mm) pitch. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The connector features a 2-row configuration with push-pull fastening, gold-plated mating contacts, and tin-lead post finishes. Substitution is based on maintaining electrical compatibility, mechanical fit, and thermal performance within the specified operating range of -55°C to 105°C.

Key Parameters

Parameter	Value
Connector Type	Header
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
Shrouding	Shrouded - 4 Wall
Fastening Type	Push-Pull
Contact Type	Male Pin
Termination	Solder
Operating Temperature	-55°C ~ 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution for the 3M 3429-6003 is determined by the following critical parameters:

Position Count & Pitch: All substitutes maintain 26 positions at 0.100" (2.54mm) mating pitch with 2-row configuration
Mounting Configuration: Through-hole solder termination with shrouded 4-wall design
Fastening Mechanism: Push-pull fastening type for connector engagement
Contact Material & Finish: Gold-plated mating surfaces with tin or tin-lead post finishes
Thermal Performance: Operating temperature range of -55°C to 105°C or higher
Flammability: UL94 V-0 material rating maintained across all substitutes

The following parts meet these substitution criteria:

3M Series (Direct Manufacturer Alternatives)

3429-6002 (Obsolete, bulk packaging)
D3429-6002-AR (Active, tray packaging, ROHS3 compliant)
N3429-6002RB (Active, bulk packaging, RoHS compliant)

Amphenol ICC (FCI) Quickie™ Series

53612-S26-7 (Active, latch lock/eject fastening)
71918-026LF (Active, push-pull fastening)

CW Industries CWN Series

CWN-350-26-0021 (Active, ROHS3 compliant)

HARTING SEK Series

09185266921 (Active, right-angle mounting variant)

Parameter Comparison

Parameter	3429-6003	3429-6002	D3429-6002-AR	N3429-6002RB	53612-S26-7	71918-026LF	CWN-350-26-0021
Positions	26	26	26	26	26	26	26
Rows	2	2	2	2	2	2	2
Pitch (mm)	2.54	2.54	2.54	2.54	2.54	2.54	2.54
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Latch Lock/Eject	Push-Pull	Push-Pull
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Contact Material	Copper Alloy	Copper Alloy	Brass	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Mating Finish	Gold	Gold	Gold	Gold	Gold or Gold, GXT™	Gold, GXT™	Gold
Post Finish	Tin-Lead	Tin-Lead	Tin	Tin	Tin-Lead	Tin	Nickel
Operating Temp (°C)	-55 ~ 105	-55 ~ 105	-55 ~ 105	-55 ~ 105	Not specified	Not specified	-55 ~ 125
Current Rating (A)	1	1	1.75	1.75	Not specified	Not specified	1
Flammability	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	Non-compliant	Non-compliant	ROHS3 Compliant	RoHS Compliant	Not specified	RoHS Compliant	ROHS3 Compliant
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct 3M Series Replacement (Preferred for Legacy Systems)

D3429-6002-AR is the recommended primary substitute. It maintains full mechanical and electrical compatibility with the 3429-6003 while offering active product status and ROHS3 compliance. The increased current rating (1.75A vs. 1A) and improved contact finish (10.0µin gold on brass) provide enhanced performance margins. Tray packaging supports production environments.

N3429-6002RB provides an alternative within the 3M product line with RoHS compliance and active status. Bulk packaging suits component-level procurement. Both parts maintain the push-pull fastening mechanism and 26-position 2.54mm pitch configuration.

For Cross-Manufacturer Substitution

71918-026LF (Amphenol ICC Quickie™ series) offers push-pull fastening identical to the original part with active product status and RoHS compliance. Phosphor bronze contacts with tin post finish and GXT™ gold plating provide reliable performance. Tube packaging is suitable for automated assembly.

CWN-350-26-0021 (CW Industries) maintains all critical parameters with ROHS3 compliance and extended operating temperature range (-55°C to 125°C). Circular contact geometry differs from the original square contacts but maintains electrical compatibility within the 26-position 2.54mm pitch specification.

53612-S26-7 (Amphenol ICC Quickie™ series) substitutes with latch lock/eject fastening instead of push-pull. This fastening type difference requires mechanical interface verification before deployment.

For Right-Angle Applications

09185266921 (HARTING SEK series) provides right-angle mounting geometry for space-constrained layouts. The 26-position 2.54mm pitch and shrouded 4-wall design maintain electrical compatibility, though the right-angle orientation requires PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can I use D3429-6002-AR as a direct replacement for 3429-6003?

A: Yes. D3429-6002-AR maintains identical mating pitch (2.54mm), position count (26), row configuration (2), shrouding (4-wall), and fastening type (push-pull). The higher current rating (1.75A) and improved contact materials provide enhanced performance. ROHS3 compliance supports modern manufacturing requirements.

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

A: Push-pull fastening engages by pushing the connector together and disengages by pulling apart. Latch lock/eject fastening uses mechanical hooks that lock during mating and require lever actuation for separation. The 53612-S26-7 uses latch lock/eject fastening and requires different mating procedures than the original push-pull design.

Q: Are there RoHS-compliant alternatives available?

A: Yes. D3429-6002-AR (ROHS3 compliant), N3429-6002RB (RoHS compliant), 71918-026LF (RoHS compliant), and CWN-350-26-0021 (ROHS3 compliant) all meet RoHS requirements. The original 3429-6003 is RoHS non-compliant.

Q: Does the contact material affect electrical performance?

A: Contact material differences (copper alloy, brass, phosphor bronze) do not affect electrical compatibility for standard signal applications. All materials maintain conductivity within the 1A to 1.75A current rating range. Material selection impacts mechanical durability and corrosion resistance over extended operating life.

Q: Can I use the HARTING 09185266921 in place of the 3M 3429-6003?

A: The HARTING 09185266921 maintains electrical compatibility but features right-angle mounting instead of vertical mounting. This requires PCB layout modification. Use only if the right-angle orientation accommodates your mechanical design.

Q: What packaging options are available?

A: Substitute parts are available in bulk, tray, and tube packaging. D3429-6002-AR uses tray packaging for production environments. N3429-6002RB and 71918-026LF support bulk and tube options respectively. Packaging selection depends on assembly process requirements and inventory management.

Q: Is the CWN-350-26-0021 compatible despite circular contacts?

A: Yes. The CWN-350-26-0021 maintains the 26-position 2.54mm pitch and shrouded 4-wall configuration. Circular contact geometry differs from the original square contacts but provides equivalent electrical performance for standard signal applications. Mechanical fit within the mating connector must be verified.

Q: What is the inventory status of these substitutes?

A: All recommended substitutes maintain active product status with current inventory availability. D3429-6002-AR (1805 pcs), N3429-6002RB (1077 pcs), 71918-026LF (922 pcs), and CWN-350-26-0021 (762 pcs) are in stock. The original 3429-6003 (1103 pcs) remains available but is classified as obsolete.

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