3M 3429-2303-UG Equivalent & Substitute Parts

Part Overview

The 3M 3429-2303-UG is a rectangular connector header with 26 positions at 2.54mm pitch, designed for through-hole mounting in board-to-board or cable applications. This connector features shrouded 3-wall construction with solder termination and latch lock/eject hooks. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

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
Contact Finish - Mating	Gold
Contact Finish - Post	Tin-Lead or Tin
Operating Temperature Range	-55°C ~ 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 3429-2303-UG is determined by strict equivalence across the following critical parameters:

Connector type (Header), contact type (Male Pin), and mating configuration (26 positions, 2 rows, 2.54mm pitch)
Mounting method (Through Hole) and termination type (Solder)
Shrouding configuration (Shrouded, 4-wall construction acceptable as functional equivalent to 3-wall)
Contact finish specifications (Gold mating surface, Tin or Tin-Lead post finish)
Operating temperature range (-55°C to 105°C minimum)
Current rating (1A minimum per contact)
Flammability rating (UL94 V-0)
Moisture sensitivity level (MSL 1)

Substitute parts are grouped into two categories: TE Connectivity AMP-Latch series connectors and Amphenol ICC Quickie™ series connectors. All listed substitutes maintain functional compatibility with the original 3429-2303-UG across these core parameters.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Positions	Pitch (mm)	Shrouding	Contact Finish - Mating	Contact Finish - Post	Operating Temp (°C)	Current Rating	Voltage Rating	RoHS Status	Inventory
3429-2303-UG	3M	3000	Obsolete	26	2.54	Shrouded - 3 Wall	Gold	Tin-Lead	-55 ~ 105	1A	—	RoHS Compliant	1083
102321-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin-Lead	-65 ~ 105	1A per Contact	250VAC	RoHS non-compliant	854
2-5102321-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin	-65 ~ 105	1A per Contact	250VAC	ROHS3 Compliant	925
2-5499206-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin	-65 ~ 105	1A	250VAC	ROHS3 Compliant	2157
499206-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin-Lead	-65 ~ 105	1A	250VAC	Not applicable	798
499922-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin-Lead	-65 ~ 105	1A	250VAC	RoHS non-compliant	1489
5102321-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin	-65 ~ 105	1A per Contact	250VAC	ROHS3 Compliant	6248
53611-S26-4LF	Amphenol ICC (FCI)	Quickie™	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold, GXT™	Tin	—	—	—	RoHS Compliant	1012
53611-S26-6LF	Amphenol ICC (FCI)	Quickie™	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold, GXT™	Tin	—	—	—	RoHS Compliant	850
5499206-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin	-65 ~ 105	1A	250VAC	ROHS3 Compliant	31289
5499922-6	TE Connectivity AMP	AMP-Latch	Active	26	2.54	Shrouded - 4 Wall	Gold or Gold-Palladium	Tin	-65 ~ 105	1A	250VAC	RoHS Compliant	62501

Engineering Selection Recommendations

Primary Substitutes (Active Status, RoHS3 Compliant):

The TE Connectivity AMP-Latch series parts 5102321-6, 2-5102321-6, 5499206-6, 2-5499206-6, and 5499922-6 are recommended as primary substitutes. These parts maintain active product status and comply with ROHS3 regulations, providing long-term availability and regulatory alignment. The 5499922-6 offers the highest inventory level (62,501 units) and is packaged in bulk format, suitable for high-volume applications.

Secondary Substitutes (Active Status, Compliance Variations):

The TE Connectivity part 102321-6 and 499206-6 are functionally equivalent but carry RoHS non-compliant or not-applicable status. These are suitable for applications where RoHS compliance is not a requirement.

Alternative Series (Amphenol ICC Quickie™):

The Amphenol ICC parts 53611-S26-4LF and 53611-S26-6LF provide functional equivalence with RoHS compliance. These parts differ in contact post length (0.120" versus 0.150") and use phosphor bronze contact material with thermoplastic insulation. Operating temperature range is not specified for these parts.

Compliance Considerations:

For new designs requiring RoHS3 compliance, select from 5102321-6, 2-5102321-6, 5499206-6, 2-5499206-6, 5499922-6, 53611-S26-4LF, or 53611-S26-6LF. For legacy systems where the original 3429-2303-UG RoHS compliance status is maintained, any listed substitute is functionally acceptable.

Frequently Asked Questions (FAQ)

Q: Can I use a 4-wall shrouded connector as a substitute for the 3-wall shrouded 3429-2303-UG?

A: Yes. The 4-wall shrouding provides equivalent or superior shielding and mechanical protection compared to 3-wall construction. All listed substitutes with 4-wall shrouding maintain functional compatibility with the original design.

Q: What is the difference between the TE Connectivity AMP-Latch and Amphenol ICC Quickie™ series?

A: Both series meet the core electrical and mechanical requirements for 26-position, 2.54mm pitch headers. The AMP-Latch series offers specified operating temperature ranges (-65°C to 105°C) and voltage ratings (250VAC). The Quickie™ series provides RoHS compliance and uses phosphor bronze contacts with thermoplastic insulation but does not specify operating temperature or voltage ratings in the provided data.

Q: Are there packaging differences between substitute parts?

A: Yes. The 3429-2303-UG is listed without specified packaging. Substitute parts are available in Tray packaging (102321-6, 2-5102321-6, 499206-6, 5102321-6, 53611-S26-4LF, 53611-S26-6LF, 5499206-6) or Bulk packaging (499922-6, 5499922-6). Select packaging based on procurement and assembly requirements.

Q: What is the difference between Tin and Tin-Lead post finishes?

A: Both finishes provide equivalent solder joint reliability. Tin-Lead finishes (102321-6, 2-5102321-6, 499206-6, 499922-6) are traditional and widely used. Tin finishes (5102321-6, 2-5499206-6, 5499206-6, 5499922-6, 53611-S26-4LF, 53611-S26-6LF) comply with lead-free requirements and are preferred for RoHS3 applications.

Q: Which substitute offers the best availability?

A: The TE Connectivity 5499922-6 provides the highest inventory level at 62,501 units in bulk packaging, followed by 5499206-6 at 31,289 units in tray packaging.

Q: Is the contact post length difference between substitutes significant?

A: Contact post length varies across substitutes (0.110" to 0.155"). This affects PCB hole depth requirements and solder joint formation. Verify PCB design compatibility with the selected substitute's contact post length before assembly.

Q: Can I mix substitute parts from different manufacturers in the same assembly?

A: All listed substitutes are mechanically and electrically compatible for board-to-cable/wire applications. However, for consistency in manufacturing and quality control, use a single part number throughout an assembly.

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