3M 3428-1302 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3428-1302 is a through-hole, right-angle rectangular connector header with 20 positions at 0.100" (2.54mm) pitch, configured as a 2-row shrouded design with 3-wall shrouding. This connector is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part features male pins with gold-plated mating contacts, tin-lead post finish, and is rated for 1A current at operating temperatures from -55°C to 105°C.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	20
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Shrouding	Shrouded - 3 Wall
Fastening Type	Latch Lock/Eject Hooks, Long
Contact Finish - Mating	Gold
Contact Finish - Post	Tin-Lead
Current Rating	1A
Operating Temperature	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 3M 3428-1302 is determined by the following critical parameters:

Primary Compatibility Criteria:

Connector type (Header), contact type (Male Pin), and position count (20 positions in 2 rows)
Mating pitch (0.100" / 2.54mm) and row spacing (0.100" / 2.54mm)
Mounting configuration (Through Hole, Right Angle)
Contact finish on mating surface (Gold)
Operating temperature range (-55°C ~ 105°C minimum)
Current rating (minimum 1A)
Material flammability (UL94 V-0)

Secondary Variation Parameters:

Shrouding configuration (3-wall vs. 4-wall)
Fastening mechanism (Latch Lock/Eject Hooks vs. Push-Pull)
Contact material (Copper Alloy vs. Brass)
Post finish composition (Tin-Lead vs. Tin)
Insulation material and height
RoHS and regulatory compliance status

Substitute parts N3428-1302RB, N3428-5002RB, and D3428-5002-AR maintain the core electrical and mechanical interface while offering enhanced specifications or compliance improvements. The TE Connectivity 499141-4 and CW Industries CWN-302-20-0021 provide cross-manufacturer alternatives with compatible mating interfaces.

Parameter Comparison

Parameter	3428-1302	N3428-1302RB	N3428-5002RB	D3428-5002-AR	499141-4	CWN-302-20-0021
Manufacturer	3M	3M	3M	3M	TE Connectivity	CW Industries
Series	3000	3000	3000	D3000	AMP-Latch	CWN
Product Status	Obsolete	Active	Active	Active	Active	Active
Connector Type	Header	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	20	20	20	20	20	20
Number of Rows	2	2	2	2	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	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)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Shrouding	Shrouded - 3 Wall	Shrouded - 3 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long	Push-Pull	Push-Pull	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long
Contact Length - Mating	0.240" (6.10mm)	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)	0.110" (2.79mm)	0.090" (2.29mm)
Insulation Height	0.310" (7.87mm)	0.310" (7.87mm)	0.340" (8.64mm)	0.340" (8.64mm)	0.315" (8.00mm)	0.291" (7.40mm)
Contact Shape	Square	Square	Square	Square	Square	Circular
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold or Gold-Palladium	Gold
Contact Finish - Post	Tin-Lead	Tin	Tin	Tin	Tin-Lead	Nickel
Contact Material	Copper Alloy	Copper Alloy	Copper Alloy	Brass	Brass	Phosphor Bronze
Current Rating	1A	1.75A	1.75A	1.75A	1A per Contact	1A
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-65°C ~ 105°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: N3428-1302RB, N3428-5002RB, D3428-5002-AR, and CWN-302-20-0021 are ROHS3 compliant alternatives. The original 3428-1302 and TE Connectivity 499141-4 are RoHS non-compliant and unsuitable for applications requiring regulatory compliance.

For Direct Form-Fit-Function Replacement: N3428-1302RB maintains identical shrouding (3-wall) and fastening (Latch Lock/Eject Hooks, Long) as the original 3428-1302, with the addition of ROHS3 compliance and improved current rating (1.75A vs. 1A). This part is the closest active equivalent.

For Enhanced Mechanical Robustness: N3428-5002RB and D3428-5002-AR feature 4-wall shrouding and push-pull fastening, providing increased mechanical stability. D3428-5002-AR uses brass contact material versus copper alloy, with slightly reduced mating contact finish thickness (10.0µin vs. 30.0µin).

For Cross-Manufacturer Alternatives: TE Connectivity 499141-4 maintains latch lock fastening and tin-lead post finish but features brass contacts and operates to -65°C. CWN-302-20-0021 offers the widest operating temperature range (-55°C ~ 125°C) and ROHS3 compliance, though it uses circular contact geometry and nickel post finish.

For Active Product Status: All substitute parts listed are active products with current manufacturing support, ensuring long-term availability and supply chain stability compared to the obsolete 3428-1302.

Frequently Asked Questions (FAQ)

Q: Can N3428-1302RB directly replace 3428-1302 on existing PCBs? A: Yes. N3428-1302RB maintains identical mating pitch (0.100" / 2.54mm), row spacing (0.100" / 2.54mm), shrouding configuration (3-wall), and fastening mechanism (Latch Lock/Eject Hooks, Long). The connector footprint and mating interface are compatible. The primary differences are ROHS3 compliance and increased current rating (1.75A vs. 1A).

Q: What is the difference between 3-wall and 4-wall shrouding? A: 3-wall shrouding provides three sides of mechanical protection around the connector contacts. 4-wall shrouding adds a fourth protective wall, offering increased mechanical robustness and EMI shielding. Both configurations maintain the same 0.100" (2.54mm) mating pitch and are mechanically compatible with standard 0.100" (2.54mm) receptacles.

Q: Why do some substitutes have higher current ratings (1.75A vs. 1A)? A: N3428-1302RB, N3428-5002RB, and D3428-5002-AR are rated for 1.75A per contact, compared to 1A for the original 3428-1302. This reflects improved contact design and material specifications in the active product lines. Designs requiring only 1A operation are fully compatible with these higher-rated parts.

Q: Are push-pull fastening (N3428-5002RB, D3428-5002-AR) and latch lock fastening (3428-1302, N3428-1302RB) interchangeable? A: No. Push-pull and latch lock fastening mechanisms are not interchangeable. Mating receptacles must match the fastening type. Verify the mating connector specification before selecting a substitute with different fastening geometry.

Q: What is the impact of contact material differences (Copper Alloy vs. Brass vs. Phosphor Bronze)? A: All three materials meet the specified electrical and mechanical requirements. Copper alloy and brass provide similar performance characteristics. Phosphor bronze (CWN-302-20-0021) offers enhanced spring properties and durability. Material selection does not affect mating compatibility at the 0.100" (2.54mm) pitch interface.

Q: Can I use CWN-302-20-0021 as a substitute despite the circular contact shape? A: CWN-302-20-0021 features circular contact geometry versus the square contacts of 3428-1302. While the mating pitch (0.100" / 2.54mm) is identical, the circular contact shape may affect mating force and contact pressure characteristics. Verify compatibility with the mating receptacle design before substitution.

Q: Which substitute offers the best compliance profile for new designs? A: N3428-1302RB, N3428-5002RB, D3428-5002-AR, and CWN-302-20-0021 are all ROHS3 compliant with active product status. For designs requiring RoHS compliance, avoid 3428-1302 and 499141-4, which are RoHS non-compliant.

Q: What is the operating temperature range difference between substitutes? A: The original 3428-1302 and most substitutes operate from -55°C to 105°C. TE Connectivity 499141-4 extends the lower limit to -65°C. CWN-302-20-0021 extends the upper limit to 125°C. Verify application temperature requirements before selecting a substitute with different thermal specifications.

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