3M 3432-2302 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3432-2302 is a through-hole rectangular connector header with 40 positions arranged in 2 rows at 0.100" (2.54mm) pitch. This connector features shrouded 3-wall design, solder termination, and latch lock/eject hook fastening. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

3432-2302

3MIn Stock: 10753432-2302 Datasheet

Current PartRFQ

N3432-2302RB

3MIn Stock: 745N3432-2302RB Datasheet

DirectRFQ

N3432-6002RB

3MIn Stock: 900N3432-6002RB Datasheet

MFR RecommendedRFQ

CWN-352-40-0021

CW IndustriesIn Stock: 1023CWN-352-40-0021 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3M 3432-2302 is determined by the following critical parameters that must remain constant:

• Connector type (Header)
• Contact type (Male Pin)
• Number of positions (40)
• Number of rows (2)
• Pitch - mating (0.100" / 2.54mm)
• Row spacing - mating (0.100" / 2.54mm)
• Mounting type (Through Hole)
• Termination (Solder)
• Material flammability rating (UL94 V-0)

Acceptable variations in substitute parts include:

• Shrouding configuration (3-wall to 4-wall)
• Fastening type (Latch Lock/Eject Hooks to Push-Pull)
• Contact finish on post (Tin-Lead to Tin or Nickel)
• Current rating (1A to 1.75A or higher)
• Operating temperature range (extended upper limit acceptable)
• RoHS compliance status (non-compliant to compliant)
• Insulation material composition (PCT/Polyester to Thermoplastic)
• Contact shape (Square to Circular)
• Insulation color variation

Parameter Comparison

Engineering Selection Recommendations

The 3M 3432-2302 is obsolete and no longer in active production. Three substitute options are available, each with distinct characteristics:

N3432-2302RB (3M) provides the closest electrical and mechanical match to the original part. This connector maintains identical shrouding (3-wall), fastening type (Latch Lock/Eject Hooks, Long), and contact geometry. The primary differences are improved current rating (1.75A versus 1A) and RoHS compliance. This part is recommended for direct replacement in applications where the original 3-wall shrouding and latch lock fastening are required.

N3432-6002RB (3M) offers enhanced shrouding (4-wall) and alternative fastening (Push-Pull). The increased shrouding provides additional EMI shielding and mechanical protection. The push-pull fastening mechanism differs from the original latch lock design, requiring evaluation of mating connector compatibility. Current rating is improved to 1.75A, and RoHS compliance is achieved. This part is suitable for applications where enhanced shrouding and push-pull engagement are acceptable or preferred.

CWN-352-40-0021 (CW Industries) represents a cross-manufacturer alternative with 4-wall shrouding and latch lock fastening. Notable differences include circular contact geometry (versus square), phosphor bronze contact material (versus copper alloy), thermoplastic insulation (versus PCT/polyester), and extended operating temperature range (-55°C to 125°C). Contact post length is reduced to 0.090" (2.29mm). This part is suitable for applications where cross-manufacturer sourcing is acceptable and the extended temperature range provides operational benefit.

All three substitute parts maintain the critical parameters: 40 positions, 2 rows, 0.100" (2.54mm) pitch, through-hole mounting, solder termination, and UL94 V-0 flammability rating.

Frequently Asked Questions (FAQ)

Q: Can N3432-2302RB be used as a direct replacement for 3432-2302?

A: Yes. N3432-2302RB maintains identical shrouding (3-wall), fastening type (Latch Lock/Eject Hooks, Long), and contact geometry. The connector is mechanically and electrically compatible with the original part. The primary improvements are RoHS compliance and increased current rating (1.75A).

Q: What is the difference between 3-wall and 4-wall shrouding?

A: 3-wall shrouding provides coverage on three sides of the connector, while 4-wall shrouding provides complete coverage on all four sides. 4-wall shrouding offers enhanced EMI shielding and mechanical protection. Selection depends on application requirements for electromagnetic compatibility and physical robustness.

Q: Can N3432-6002RB be used if the original design specifies latch lock fastening?

A: N3432-6002RB uses push-pull fastening instead of latch lock/eject hooks. While both are positive engagement mechanisms, the mating connector must be compatible with push-pull engagement. Mechanical compatibility with existing mating connectors must be verified before substitution.

Q: What are the implications of using CWN-352-40-0021 with circular contacts instead of square contacts?

A: Circular contacts provide different contact geometry and surface area compared to square contacts. This affects contact resistance, mating force, and insertion/withdrawal characteristics. The mating connector must be designed for circular contact geometry. CWN-352-40-0021 is suitable only for applications where the mating connector is compatible with circular contact design.

Q: Does the reduced contact post length of CWN-352-40-0021 affect PCB assembly?

A: CWN-352-40-0021 has a contact post length of 0.090" (2.29mm) compared to 0.112" (2.84mm) for the original part. This difference may affect solder joint formation and mechanical support on the PCB. PCB design and assembly process parameters must be evaluated to ensure adequate solder joint quality and mechanical reliability with the shorter post length.

Q: Are all substitute parts RoHS compliant?

A: N3432-2302RB and N3432-6002RB are RoHS Compliant. CWN-352-40-0021 is ROHS3 Compliant. The original 3432-2302 is RoHS non-compliant. Selection of a compliant substitute part is necessary for applications subject to RoHS regulations.

Q: What is the significance of the extended operating temperature range in CWN-352-40-0021?

A: CWN-352-40-0021 operates from -55°C to 125°C, compared to -55°C to 105°C for the original part and other 3M substitutes. The extended upper temperature limit provides operational capability in higher-temperature environments. This is beneficial only if the application requires operation above 105°C.

Q: Can current rating differences affect circuit design?

A: The original 3432-2302 is rated for 1A, while N3432-2302RB and N3432-6002RB are rated for 1.75A. Higher current rating provides additional margin but does not require circuit redesign if the original design operated within 1A limits. CWN-352-40-0021 maintains the 1A rating. Current rating selection should match application requirements with appropriate safety margin.