3M 3433-1202 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3433-1202 is a through-hole, right-angle rectangular connector header with 50 positions at 0.100" (2.54mm) pitch. This connector is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement. The 3433-1202 features shrouded 3-wall construction with latch lock/eject fastening and is suitable for board-to-board or cable applications 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, Right Angle
Shrouding	Shrouded
Contact Length - Mating	0.240" (6.10mm)
Contact Length - Post	0.112" (2.84mm)
Current Rating	1.75A
Operating Temperature	-55°C to 105°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution of the 3433-1202 is determined by the following critical parameters that must remain constant or compatible:

Connector geometry: 50 positions, 2 rows, 0.100" (2.54mm) pitch and row spacing
Mounting interface: Through-hole, right-angle orientation
Contact specifications: Male pin type, 0.240" (6.10mm) mating contact length, 0.100" (2.54mm) pitch
Electrical performance: 1.75A current rating minimum, operating temperature range -55°C to 105°C
Safety compliance: UL94 V-0 flammability rating

The three substitute parts identified—D3433-5002-AR, N3433-5002RB, and CWN-301-50-0021—maintain these core parameters while differing in secondary characteristics such as shrouding wall count, fastening mechanism, contact material composition, and regulatory compliance status.

Parameter Comparison

Parameter	3433-1202 (Main)	D3433-5002-AR	N3433-5002RB	CWN-301-50-0021
Manufacturer	3M	3M	3M	CW Industries
Product Status	Obsolete	Active	Active	Active
Connector Type	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	50	50	50	50
Number of Rows	2	2	2	2
Pitch - Mating	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)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Shrouding	Shrouded - 3 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	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)
Contact Length - Post	0.112" (2.84mm)	0.112" (2.84mm)	0.112" (2.84mm)	0.090" (2.29mm)
Insulation Height	0.310" (7.87mm)	0.340" (8.64mm)	0.340" (8.64mm)	0.291" (7.40mm)
Contact Shape	Square	Square	Square	Circular
Contact Finish - Mating	Gold	Gold	Gold	Gold
Contact Material	Copper Alloy	Brass	Copper Alloy	Phosphor Bronze
Current Rating (Amps)	1.75A	1.75A	1.75A	1A
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

D3433-5002-AR is the primary manufacturer-recommended substitute. This 3M part maintains full electrical and mechanical compatibility with the 3433-1202 while offering active product status and ROHS3 compliance. The D3433-5002-AR features enhanced 4-wall shrouding and push-pull fastening, providing improved mechanical robustness. The contact material differs (brass versus copper alloy), but electrical performance remains equivalent at 1.75A. This part is suitable for new designs and ongoing production requiring RoHS compliance.

N3433-5002RB provides an alternative 3M solution with identical electrical specifications and RoHS compliance. This part retains the copper alloy contact material of the original 3433-1202 while incorporating 4-wall shrouding and push-pull fastening. The N3433-5002RB is available in bulk packaging and maintains full compatibility with the original connector footprint and mating interface.

CWN-301-50-0021 from CW Industries offers a cross-manufacturer substitute meeting core geometric and electrical requirements. This connector maintains the 50-position, 2-row configuration at 0.100" (2.54mm) pitch with identical mating contact length. However, the CWN-301-50-0021 exhibits a reduced current rating of 1A (versus 1.75A) and shorter post contact length of 0.090" (2.29mm). This part is suitable only for applications where the 1A current rating is sufficient and PCB pad depth accommodates the shorter post. The CWN-301-50-0021 provides ROHS3 compliance and extended operating temperature range to 125°C.

Frequently Asked Questions (FAQ)

Q: Can the 3433-1202 be directly replaced with D3433-5002-AR without PCB redesign?

A: The D3433-5002-AR maintains identical mating contact length (0.240"), pitch (0.100"), and row spacing (0.100"), ensuring direct footprint compatibility. The increased insulation height (0.340" versus 0.310") and enhanced shrouding do not affect PCB pad layout. Direct substitution is possible without redesign.

Q: What is the impact of the fastening mechanism change from latch lock to push-pull?

A: The fastening mechanism change affects mating and unmating force characteristics but does not impact electrical performance or mechanical fit. Push-pull fastening (D3433-5002-AR, N3433-5002RB) provides different tactile feedback and engagement force compared to the latch lock design of the original 3433-1202. System integration testing is required if mating force specifications are critical to the application.

Q: Is the CWN-301-50-0021 suitable for high-current applications?

A: The CWN-301-50-0021 is rated for 1A maximum current, compared to 1.75A for the 3433-1202. This part is not suitable for applications requiring the full 1.75A current rating. Use only when application current requirements do not exceed 1A per contact.

Q: What are the RoHS compliance implications of selecting a substitute?

A: The original 3433-1202 is RoHS non-compliant. Both D3433-5002-AR and N3433-5002RB offer ROHS3 compliance, making them suitable for applications subject to RoHS regulations. The CWN-301-50-0021 also provides ROHS3 compliance. Selection should align with applicable regulatory requirements for the target market.

Q: Does the contact material difference affect signal integrity?

A: All substitute parts maintain gold mating contact finish, ensuring equivalent signal integrity and contact resistance characteristics. The underlying contact material (brass, copper alloy, or phosphor bronze) does not materially affect performance in standard signal applications operating within the specified current and temperature ranges.

Q: Can the 3433-1202 be used interchangeably with N3433-5002RB in existing assemblies?

A: Yes. The N3433-5002RB maintains identical electrical specifications (1.75A, -55°C to 105°C), mating contact geometry (0.240", 0.100" pitch), and copper alloy contact material. The connector is mechanically and electrically interchangeable with the 3433-1202 in existing designs.

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