3M 3428-5203 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3428-5203 is a through-hole, right-angle rectangular connector header with 20 positions at 2.54mm pitch, designed for board-to-board or cable interconnection applications. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The connector features shrouded 4-wall construction with latch lock/eject hook fastening, gold-plated mating contacts, and tin-lead post finish. Operating temperature range spans -55°C to 105°C with a current rating of 1.75A per contact.

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 - 4 Wall
Operating Temperature	-55°C ~ 105°C
Current Rating	1.75A
Material Flammability Rating	UL94 V-0
Insulation Color	Black

Substitute Part Grouping Explanation

Substitution eligibility for the 3428-5203 is determined by the following critical parameters: connector type (header), contact type (male pin), number of positions (20), number of rows (2), mating pitch (2.54mm), row spacing (2.54mm), mounting type (through hole, right angle), shrouding (4-wall), and operating temperature range (-55°C to 105°C).

The substitute parts identified fall into two categories:

Category 1: Direct 3M Series 3000 Substitutes

N3428-5203RB: Active product status, identical electrical and mechanical specifications, ROHS3 compliant
N3428-5002RB: Active product status, push-pull fastening variant, ROHS3 compliant
D3428-5002-AR: Active product status, D3000 series variant with push-pull fastening, ROHS3 compliant

Category 2: Cross-Manufacturer Substitute

2-5499345-4: TE Connectivity AMP-Latch series, active product status, functionally equivalent with minor parameter variations

All substitutes maintain the core electrical and mechanical compatibility requirements: 20-position, 2-row configuration at 2.54mm pitch, through-hole right-angle mounting, shrouded 4-wall construction, and operating temperature range of -55°C to 105°C or better.

Parameter Comparison

Parameter	3428-5203	N3428-5203RB	N3428-5002RB	D3428-5002-AR	2-5499345-4
Manufacturer	3M	3M	3M	3M	TE Connectivity
Product Status	Obsolete	Active	Active	Active	Active
Number of Positions	20	20	20	20	20
Number of Rows	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)
Row Spacing - Mating	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
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	Latch Lock/Eject Hooks, Short	Latch Lock/Eject Hooks, Short	Push-Pull	Push-Pull	Latch Lock/Eject Hooks, Short
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	0.155" (3.94mm)	0.155" (3.94mm)	0.112" (2.84mm)	0.112" (2.84mm)	0.110" (2.79mm)
Insulation Height	0.340" (8.64mm)	0.340" (8.64mm)	0.340" (8.64mm)	0.340" (8.64mm)	0.315" (8.00mm)
Contact Shape	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold or Gold-Palladium
Contact Finish - Post	Tin-Lead	Tin	Tin	Tin	Tin
Contact Material	Copper Alloy	Copper Alloy	Copper Alloy	Brass	Brass
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-65°C ~ 105°C
Current Rating	1.75A	1.75A	1.75A	1.75A	1A per Contact
Material Flammability Rating	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	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

N3428-5203RB is the primary substitute for the obsolete 3428-5203. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The only material change is post finish from tin-lead to tin, which is compatible with standard solder processes. This part is recommended for direct replacement in new designs and production continuations.

N3428-5002RB provides an alternative with push-pull fastening instead of latch lock/eject hooks. This part is suitable for applications where push-pull engagement is preferred or required. Contact post length is reduced to 0.112" (2.84mm), which may require PCB layout adjustment. ROHS3 compliance and active status make this a viable long-term solution.

D3428-5002-AR represents the D3000 series variant with push-pull fastening and brass contact material. This part offers extended lower operating temperature capability (-55°C minimum) and is packaged in trays. The reduced contact post length and different contact material require design verification before implementation.

2-5499345-4 from TE Connectivity provides cross-manufacturer compatibility with latch lock/eject hook fastening matching the original part. This option is suitable for applications requiring multi-source qualification. Note the reduced current rating of 1A per contact versus 1.75A for 3M variants, and the lower insulation height of 0.315" (8.00mm). Extended lower operating temperature to -65°C and voltage rating of 250VAC are provided specifications.

All substitute parts maintain UL94 V-0 flammability rating and unlimited moisture sensitivity level (MSL 1). Selection should be based on fastening type preference, contact material compatibility, current requirements, and compliance certifications needed for the application.

Frequently Asked Questions (FAQ)

Q: Can N3428-5203RB be used as a direct replacement for 3428-5203? A: Yes. N3428-5203RB maintains identical electrical and mechanical specifications including 20 positions, 2.54mm pitch, through-hole right-angle mounting, and latch lock/eject hook fastening. The change from tin-lead to tin post finish is compatible with standard solder processes. The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant original part.

Q: What is the difference between latch lock/eject hooks and push-pull fastening? A: Latch lock/eject hooks (3428-5203, N3428-5203RB, 2-5499345-4) provide positive mechanical engagement with audible/tactile feedback and require deliberate unlatching. Push-pull fastening (N3428-5002RB, D3428-5002-AR) allows mating and unmating through axial force without additional latching mechanisms. Selection depends on application requirements for connection security and ease of service.

Q: Are there packaging differences between substitutes? A: Yes. N3428-5203RB and N3428-5002RB are supplied in bulk packaging. D3428-5002-AR is supplied in trays. 2-5499345-4 is supplied in trays. Packaging selection may affect handling, storage, and assembly processes.

Q: What is the significance of the contact post length variation? A: The original 3428-5203 has a contact post length of 0.155" (3.94mm). Substitutes N3428-5002RB and D3428-5002-AR reduce this to 0.112" (2.84mm), and 2-5499345-4 to 0.110" (2.79mm). Shorter post lengths require PCB hole depth and solder fillet geometry verification to ensure adequate solder joint formation and mechanical strength.

Q: Why does 2-5499345-4 have a lower current rating? A: The TE Connectivity 2-5499345-4 is rated at 1A per contact versus 1.75A for 3M variants. This reflects different contact material (brass versus copper alloy) and design specifications. Applications requiring the full 1.75A rating should use 3M substitutes N3428-5203RB, N3428-5002RB, or D3428-5002-AR.

Q: Are all substitutes ROHS3 compliant? A: Yes. N3428-5203RB, N3428-5002RB, D3428-5002-AR, and 2-5499345-4 are all ROHS3 compliant. The original 3428-5203 is RoHS non-compliant. This compliance improvement is a key advantage of substitution for new designs and regulated applications.

Q: Can D3428-5002-AR be used in place of N3428-5002RB? A: Both parts share 20-position, 2.54mm pitch, through-hole right-angle mounting, and push-pull fastening. However, D3428-5002-AR uses brass contacts versus copper alloy in N3428-5002RB, and has different contact finish thickness specifications. Design verification is required before substitution, particularly for applications sensitive to contact resistance or thermal performance.

Q: What is the operating temperature range difference with 2-5499345-4? A: The TE Connectivity 2-5499345-4 extends the lower operating temperature to -65°C compared to -55°C for 3M variants. This provides additional margin for cold environment applications. The upper temperature limit of 105°C is consistent across all parts.

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