3M 3433-2603 Rectangular Connector Header 50-Position 2.54mm Equivalent & Substitute Parts

Part Overview

The 3M 3433-2603 is a through-hole rectangular connector header with 50 positions at 0.100" (2.54mm) pitch, configured as a 2-row shrouded design with male pins. This connector is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part features solder termination, latch lock fastening, and gold-plated mating contacts suitable for board-to-board or cable interconnection in industrial and commercial electronics.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	50
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
Operating Temperature Range	-55°C to 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution for the 3M 3433-2603 is determined by strict alignment of the following critical parameters:

Connector configuration: 50-position, 2-row header with 0.100" (2.54mm) pitch and row spacing
Contact type: Male pin with square contact shape
Mounting and termination: Through-hole solder termination
Shrouding: Shrouded design with keying slot and mounting flange
Operating temperature: -55°C to 105°C minimum
Current rating: Minimum 1A per contact
Contact finish: Gold-plated mating surface with tin or tin-lead post finish
Fastening mechanism: Latch lock or push-pull fastening compatible with mating receptacles

Substitute parts are grouped into two categories: direct 3M series replacements (D3000 and 3000 series) and cross-manufacturer alternatives (TE Connectivity AMP-Latch series). All substitutes maintain the core electrical and mechanical interface specifications required for drop-in replacement.

Parameter Comparison

Parameter	3433-2603	D3433-6002-AR	N3433-6002RB	1-5102321-0	1-5499206-0	1-5499922-0	1-5499923-0	1-5746443-0
Manufacturer	3M	3M	3M	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity
Series	3000	D3000	3000	AMP-Latch	AMP-Latch	AMP-Latch	AMP-Latch	AMP-Latch
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Positions / Rows	50 / 2	50 / 2	50 / 2	50 / 2	50 / 2	50 / 2	50 / 2	50 / 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)	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)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Shrouding	Shrouded - 3 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 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	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Press-Fit, Solder
Fastening Type	Latch Lock/Eject Hooks, Long	Push-Pull	Push-Pull	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks
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)	0.240" (6.10mm)	0.240" (6.10mm)
Contact Length - Post	0.155" (3.94mm)	0.112" (2.84mm)	0.112" (2.84mm)	0.155" (3.94mm)	0.110" (2.79mm)	0.110" (2.79mm)	0.155" (3.94mm)	0.174" (4.42mm)
Overall Contact Length	0.695" (17.65mm)	0.652" (16.56mm)	0.652" (16.56mm)	0.684" (17.37mm)	0.639" (16.23mm)	0.639" (16.23mm)	0.684" (17.37mm)	0.703" (17.86mm)
Insulation Height	0.680" (17.27mm)	0.680" (17.27mm)	0.680" (17.27mm)	0.549" (13.94mm)	0.549" (13.94mm)	0.549" (13.94mm)	0.549" (13.94mm)	0.549" (13.94mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold or Gold-Palladium	Gold or Gold-Palladium	Gold or Gold-Palladium	Gold or Gold-Palladium	Gold or Gold-Palladium
Contact Finish Thickness - Mating	30.0µin (0.76µm)	10.0µin (0.25µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	15.0µin (0.38µm)	30.0µin (0.76µm)
Contact Finish - Post	Tin-Lead	Tin	Tin	Tin-Lead	Tin-Lead	Tin-Lead	Tin	Tin
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-65°C to 105°C	-65°C to 105°C	-65°C to 105°C	-65°C to 105°C	-65°C to 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Current Rating (Amps)	1A	1.75A	1.75A	1A per Contact	1A	1A	1A per Contact	1A per Contact
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

3M Series Substitutes (D3433-6002-AR, N3433-6002RB)

The 3M D3433-6002-AR and N3433-6002RB are direct manufacturer alternatives within the 3M connector family. Both parts maintain the 50-position, 2-row 2.54mm pitch configuration and through-hole solder termination. Key differences include upgraded shrouding (4-wall versus 3-wall), push-pull fastening instead of latch lock, and improved current rating (1.75A versus 1A). Both parts are active products with RoHS compliance. The D3433-6002-AR is packaged in trays, while N3433-6002RB is supplied in bulk. These parts are suitable for applications where the push-pull fastening mechanism is compatible with existing mating receptacles.

TE Connectivity AMP-Latch Series Substitutes

The TE Connectivity 1-5102321-0, 1-5499206-0, 1-5499922-0, 1-5499923-0, and 1-5746443-0 are cross-manufacturer alternatives from the AMP-Latch series. All maintain the 50-position, 2-row 2.54mm pitch and latch lock fastening mechanism compatible with the original 3433-2603. These parts feature 4-wall shrouding, through-hole solder termination, and operating temperature range of -65°C to 105°C (exceeding the original -55°C to 105°C specification). All TE Connectivity substitutes are active products with RoHS3 compliance. Variations in contact post length (0.110" to 0.174") and contact finish thickness accommodate different PCB thicknesses and environmental requirements. The 1-5746443-0 offers dual termination capability (press-fit and solder), providing additional assembly flexibility.

Compliance Considerations

The original 3433-2603 is RoHS non-compliant. All substitute parts listed are RoHS compliant (either RoHS3 or RoHS Compliant status), making them suitable for applications subject to RoHS directives. TE Connectivity parts carry REACH Unaffected or REACH Affected status; verify REACH compliance requirements for your specific application region.

Frequently Asked Questions (FAQ)

Q: Can the 3M D3433-6002-AR replace the 3433-2603 directly?

A: The D3433-6002-AR is mechanically and electrically compatible for the 50-position, 2-row 2.54mm pitch interface. However, the fastening mechanism differs: D3433-6002-AR uses push-pull fastening while 3433-2603 uses latch lock. Verify that your mating receptacle is compatible with push-pull fastening before substitution.

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

A: Latch lock fastening uses mechanical hooks that engage and disengage with corresponding slots on the mating connector, providing positive mechanical retention. Push-pull fastening uses a sliding collar mechanism for connection and disconnection. These mechanisms are not interchangeable; the mating receptacle must be designed for the specific fastening type.

Q: Are TE Connectivity AMP-Latch parts compatible with 3M receptacles?

A: TE Connectivity AMP-Latch series parts maintain the same 50-position, 2-row 2.54mm pitch and latch lock fastening mechanism as the original 3433-2603. Compatibility depends on whether your mating receptacles are designed to accept AMP-Latch headers. Consult your receptacle documentation or contact the receptacle manufacturer to confirm cross-compatibility.

Q: What is the significance of contact post length variations?

A: Contact post length determines the depth of solder connection into the PCB. Longer posts (0.155" to 0.174") provide greater solder joint depth for thicker PCBs or applications requiring enhanced mechanical strength. Shorter posts (0.110" to 0.112") are suitable for standard PCB thicknesses. Select based on your PCB thickness and solder joint requirements.

Q: Does the 4-wall shrouding versus 3-wall shrouding affect compatibility?

A: Shrouding provides mechanical protection and keying alignment. The upgrade from 3-wall to 4-wall shrouding improves contact protection and alignment accuracy. This change does not affect electrical compatibility but may require verification that your mating receptacle accommodates the increased shroud dimensions.

Q: Why do some parts have higher current ratings (1.75A versus 1A)?

A: Current rating depends on contact material, contact finish, and overall connector design. Parts with higher current ratings (D3433-6002-AR and N3433-6002RB at 1.75A) can safely carry greater current without excessive heat generation. For applications requiring only 1A, either rating is acceptable; higher-rated parts provide additional margin.

Q: What is the difference between tin and tin-lead post finishes?

A: Tin-lead post finish (original 3433-2603) contains lead and is RoHS non-compliant. Pure tin post finish (D3433-6002-AR, N3433-6002RB, and most TE Connectivity parts) is RoHS compliant. Tin provides equivalent solderability and reliability for standard applications. Lead-free solder is required for tin post finishes.

Q: Are all listed substitutes available in the same packaging options?

A: No. Packaging varies: D3433-6002-AR is supplied in trays, N3433-6002RB in bulk, and TE Connectivity parts in either trays or bulk depending on the specific part number. Verify packaging availability with your supplier to match your procurement requirements.

Q: What is the REACH status, and why does it matter?

A: REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) is a European Union regulation governing chemical substances. REACH Unaffected parts contain no restricted substances and are suitable for all markets. REACH Affected parts may contain restricted substances and require compliance verification for EU applications. Confirm REACH status for your target market.

Q: Can the 1-5746443-0 with press-fit termination be used in existing solder-only designs?

A: The 1-5746443-0 supports both press-fit and solder termination. It can be used in solder-only applications by utilizing only the solder termination capability. Press-fit capability provides additional assembly flexibility for future applications but does not interfere with standard solder assembly.

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