CWN-351-34-0021 Equivalent & Substitute Parts

Part Overview

The CWN-351-34-0021 is a rectangular connector header manufactured by CW Industries, designed for through-hole mounting applications. This 34-position, 2-row connector with 0.100" (2.54mm) pitch serves board-to-cable/wire interconnection requirements. The part is currently active in production with 997 units in stock. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and compatibility options for applications requiring 34-position shrouded headers with identical or comparable electrical and mechanical characteristics.

Substiute Parts

CWN-351-34-0021

CW IndustriesIn Stock: 1065CWN-351-34-0021 Datasheet

Current PartRFQ

71918-034LF

Amphenol ICC (FCI)In Stock: 172071918-034LF Datasheet

SimilarRFQ

D3431-6002-AR

3MIn Stock: 936D3431-6002-AR Datasheet

SimilarRFQ

N3431-6002RB

3MIn Stock: 850N3431-6002RB Datasheet

SimilarRFQ

N3431-6003RB

3MIn Stock: 1265N3431-6003RB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CWN-351-34-0021 are qualified based on the following critical parameters that must match or be compatible:

Core Matching Criteria:

• Number of Positions: 34
• Number of Rows: 2
• Pitch - Mating: 0.100" (2.54mm)
• Row Spacing - Mating: 0.100" (2.54mm)
• Connector Type: Header
• Contact Type: Male Pin
• Mounting Type: Through Hole
• Shrouding: Shrouded - 4 Wall
• Termination: Solder
• Style: Board to Cable/Wire or Board to Board or Cable

Allowable Variations:

• Contact Shape: Circular or Square (both acceptable for 2.54mm pitch applications)
• Contact Material: Phosphor Bronze, Brass, or Copper Alloy (all suitable for standard signal applications)
• Contact Finish - Mating: Gold or Gold with GXT™ (both provide equivalent corrosion resistance)
• Contact Finish - Post: Nickel or Tin (both acceptable for solder termination)
• Insulation Material: Thermoplastic, Thermoplastic with Glass Filled, or PCT/Polyester with Glass Filled (all meet UL94 V-0)
• Fastening Type: Latch Lock/Eject Hooks or Push-Pull (both provide secure mating)
• Current Rating: 1A or higher (1.75A acceptable as higher rating)
• Operating Temperature: -55°C ~ 125°C or -55°C ~ 105°C (both cover standard industrial range)

The following parts meet these substitution criteria: 71918-034LF (Amphenol ICC), D3431-6002-AR (3M), N3431-6002RB (3M), and N3431-6003RB (3M).

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts maintain active product status and meet or exceed the core electrical and mechanical requirements of the CWN-351-34-0021. Selection among these alternatives should be based on the following factors:

RoHS and Regulatory Compliance: All parts are RoHS compliant. The CWN-351-34-0021, D3431-6002-AR, N3431-6002RB, and N3431-6003RB carry ROHS3 certification. The 71918-034LF carries RoHS compliance designation. All parts are classified as EAR99 for export control purposes and carry identical HTSUS codes (8536.69.4040).

Thermal Operating Range: The CWN-351-34-0021 operates across -55°C to 125°C. The 3M alternatives (D3431-6002-AR, N3431-6002RB, N3431-6003RB) operate across -55°C to 105°C, which covers standard industrial and commercial temperature ranges. The 71918-034LF does not specify an operating temperature range.

Current Rating: The CWN-351-34-0021 is rated for 1A per contact. The 3M alternatives provide 1.75A per contact, offering higher current capacity. The 71918-034LF does not specify a current rating.

Contact Finish Thickness: The CWN-351-34-0021 specifies 30.0µin (0.76µm) gold mating finish. The D3431-6002-AR provides 10.0µin (0.25µm), which is thinner. The 71918-034LF, N3431-6002RB, and N3431-6003RB all provide 30.0µin (0.76µm), matching the original specification.

Packaging and Availability: The CWN-351-34-0021 is supplied in bulk packaging with 997 units in stock. The N3431-6003RB is also supplied in bulk with 1210 units available. The 71918-034LF (tube packaging, 1629 units) and D3431-6002-AR (tray packaging, 877 units) offer alternative packaging formats.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a square contact shape instead of the circular contact specified in the original part?

A: Yes. For 0.100" (2.54mm) pitch applications, both circular and square contact geometries are mechanically and electrically compatible. The contact shape does not affect mating compatibility or electrical performance in standard signal applications.

Q: What is the difference between the fastening mechanisms (Latch Lock/Eject Hooks versus Push-Pull)?

A: Both fastening types provide secure mating and demating. Latch Lock/Eject Hooks use spring-loaded latches for positive retention. Push-Pull connectors use a pull-to-disconnect mechanism. Both are suitable for board-to-cable/wire applications; selection depends on application-specific handling and maintenance requirements.

Q: Are the 3M substitute parts (D3431-6002-AR, N3431-6002RB, N3431-6003RB) interchangeable with each other?

A: The three 3M parts share identical pitch, position count, and core electrical specifications. Key differences are contact post length (N3431-6003RB has longer posts at 0.155" versus 0.112" for the other two) and packaging format. Selection depends on PCB hole depth requirements and packaging preferences.

Q: Does the difference in contact material (Phosphor Bronze versus Brass versus Copper Alloy) affect electrical performance?

A: All three contact materials provide equivalent electrical conductivity and corrosion resistance for standard signal applications. Material selection reflects manufacturing process differences among suppliers and does not impact functional compatibility.

Q: What is the significance of the gold finish thickness difference in the D3431-6002-AR (10.0µin versus 30.0µin in other parts)?

A: Gold finish thickness affects long-term corrosion resistance and contact wear characteristics. The 10.0µin thickness in the D3431-6002-AR is within acceptable limits for standard applications but provides less margin for extended environmental exposure compared to the 30.0µin specification in other parts.

Q: Can I substitute a part with a higher current rating (1.75A) for an application designed for 1A?

A: Yes. A higher current rating indicates greater current-carrying capacity and is suitable for applications rated at or below the original specification. The 3M alternatives rated for 1.75A are fully compatible with 1A applications.

Q: Are all these parts suitable for high-temperature applications up to 125°C?

A: The CWN-351-34-0021 is rated to 125°C. The 3M substitute parts are rated to 105°C. For applications requiring sustained operation above 105°C, the CWN-351-34-0021 is the appropriate choice. For applications at or below 105°C, all parts are suitable.

Q: What packaging format should I select for my application?

A: Bulk packaging (CWN-351-34-0021, N3431-6003RB) is suitable for high-volume manufacturing. Tube packaging (71918-034LF) provides organized component handling for moderate volumes. Tray packaging (D3431-6002-AR, N3431-6002RB) offers organized storage and automated pick-and-place compatibility. Selection depends on assembly process requirements and inventory management practices.