CWN-351-40-0021 Equivalent & Substitute Parts

Part Overview

The CWN-351-40-0021 is a rectangular connector header manufactured by CW Industries, designed for through-hole mounting applications. This 40-position, 2-row connector with 0.100" (2.54mm) pitch serves board-to-cable/wire interconnection requirements. The part is Active in product status with 1023 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design flexibility permits component interchange based on electrical and mechanical compatibility.

Key Parameters

Parameter	Value
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
Shrouding	Shrouded - 4 Wall
Termination	Solder
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CWN-351-40-0021 is determined by strict alignment of the following critical parameters:

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
Shrouding: Shrouded - 4 Wall
Termination: Solder
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in secondary attributes such as contact shape, insulation material composition, fastening mechanism, and contact finish specifications do not preclude functional substitution when these primary parameters align.

Parameter Comparison

Parameter	CWN-351-40-0021 (CW Industries)	09185406924 (HARTING)	09185407924 (HARTING)	71918-040LF (Amphenol ICC)	N3432-6002RB (3M)
Connector Type	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	40	40	40	40	40
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	Through Hole	Through Hole	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder	Solder	Solder	Solder
Contact Length - Mating	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)	0.228" (5.80mm)	0.240" (6.10mm)
Contact Length - Post	0.090" (2.29mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.112" (2.84mm)
Insulation Height	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.685" (17.40mm)	0.680" (17.27mm)
Contact Shape	Circular	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold, GXT™	Gold
Contact Finish - Post	Nickel	Tin	Tin	Tin	Tin
Contact Material	Phosphor Bronze	Copper Alloy	Copper Alloy	Phosphor Bronze	Copper Alloy
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	Not specified	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Current Rating (Amps)	1A	Not specified	Not specified	Not specified	1.75A

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and comply with RoHS and REACH requirements. The CWN-351-40-0021, 09185406924, 09185407924, and 71918-040LF are ROHS3 Compliant, while N3432-6002RB is RoHS Compliant. All parts carry UL94 V-0 flammability ratings and MSL 1 moisture sensitivity classification.

The N3432-6002RB from 3M provides the highest current rating at 1.75A compared to the primary part's 1A specification. However, its maximum operating temperature is limited to -55°C ~ 105°C, which is 20°C lower than the CWN-351-40-0021 upper limit of 125°C. This temperature differential should be evaluated against application requirements.

The 71918-040LF from Amphenol ICC (Quickie™ series) does not specify an operating temperature range in the provided data. Contact length for mating is 0.228" (5.80mm), which is 0.012" shorter than the primary part and other substitutes.

The HARTING parts (09185406924 and 09185407924) are functionally identical in electrical and mechanical specifications, with the primary distinction being packaging format (Bulk for both).

Frequently Asked Questions (FAQ)

Q: Can the HARTING 09185406924 and 09185407924 be used interchangeably with the CWN-351-40-0021?

A: Yes. Both HARTING parts meet all critical substitution parameters: 40 positions, 2 rows, 0.100" pitch, through-hole mounting, shrouded 4-wall design, solder termination, UL94 V-0 rating, and MSL 1 classification. Differences in contact shape (square vs. circular), insulation material composition, and fastening mechanism (push-pull vs. latch lock) do not affect functional compatibility for standard board-to-cable/wire applications.

Q: What is the impact of the N3432-6002RB operating temperature limit of -55°C ~ 105°C?

A: The N3432-6002RB has a maximum operating temperature 20°C lower than the CWN-351-40-0021 (-55°C ~ 125°C). Applications requiring sustained operation above 105°C should not use this substitute. Applications within the -55°C ~ 105°C range are compatible.

Q: Why does the 71918-040LF have a shorter mating contact length of 0.228" versus 0.240"?

A: The 71918-040LF contact length difference of 0.012" (0.30mm) is within typical manufacturing tolerances for this connector class. Mating depth compatibility depends on the receptacle design. Confirm receptacle specifications before substitution if contact engagement depth is critical to the application.

Q: Are all substitute parts available in the same packaging as the CWN-351-40-0021?

A: The CWN-351-40-0021 packaging is not specified in the provided data. HARTING parts are supplied in Bulk packaging, the 71918-040LF in Tube packaging, and the N3432-6002RB in Bulk packaging. Packaging format may affect procurement lead times and handling requirements.

Q: What is the significance of the contact post finish difference (Nickel vs. Tin)?

A: The CWN-351-40-0021 uses Nickel post finish (50.0µin / 1.27µm), while all substitutes use Tin post finish (ranging from 78.7µin to 200.0µin). Both finishes provide adequate solder joint reliability. Tin offers superior solderability in standard wave and reflow processes. Nickel provides enhanced corrosion resistance in high-humidity environments. Selection depends on PCB assembly process and environmental exposure.

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