CWN-350-20-0021 Equivalent & Substitute Parts

Part Overview

The CWN-350-20-0021 is a rectangular connector header manufactured by CW Industries, designed for through-hole mounting applications. This shrouded 20-position header with 2.54mm pitch serves board-to-cable/wire interconnection requirements. The part is active in production status with full inventory availability. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements necessitate different contact geometries, post lengths, or material specifications.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	20
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 - 4 Wall
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Operating Temperature	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the CWN-350-20-0021 is determined by the following critical parameters:

Connector Type, Contact Type, Position Count, and Pitch: All substitute parts maintain identical specifications (Header, Male Pin, 20 positions, 2.54mm pitch).
Shrouding and Mounting: All candidates feature shrouded 4-wall construction with through-hole mounting.
Termination and Fastening: All parts use solder termination with push-pull fastening.
Compliance: All substitute parts maintain UL94 V-0 flammability rating and ROHS3 compliance.

Variations among substitute parts occur in contact geometry (circular vs. square), contact length specifications, insulation material composition, and current rating capacity. These differences are permissible within the substitution framework when the application requirements accommodate the specific contact post length and current handling characteristics of the alternative part.

Parameter Comparison

Parameter	CWN-350-20-0021 (CW Industries)	71918-020LF (Amphenol ICC)	N3428-6002RB (3M)	N3428-6003RB (3M)
Number of Positions	20	20	20	20
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)
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin
Contact Shape	Circular	Square	Square	Square
Contact Length - Mating	0.240" (6.10mm)	0.228" (5.80mm)	0.240" (6.10mm)	0.240" (6.10mm)
Contact Length - Post	0.090" (2.29mm)	0.114" (2.90mm)	0.112" (2.84mm)	0.155" (3.94mm)
Insulation Height	0.681" (17.30mm)	0.685" (17.40mm)	0.680" (17.27mm)	0.680" (17.27mm)
Contact Finish - Mating	Gold	Gold, GXT™	Gold	Gold
Contact Finish - Post	Nickel	Tin	Tin	Tin
Contact Material	Phosphor Bronze	Phosphor Bronze	Copper Alloy	Copper Alloy
Current Rating (Amps)	1A	Not specified	1.75A	1.75A
Operating Temperature	-55°C ~ 125°C	Not specified	-55°C ~ 105°C	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull

Engineering Selection Recommendations

CWN-350-20-0021 (Primary Part): Select this part when CW Industries inventory is available and the application operates within the -55°C to 125°C temperature range with 1A current requirements. This part features circular contact geometry and phosphor bronze material with nickel post finish.

71918-020LF (Amphenol ICC - Quickie™ Series): This substitute is suitable when Amphenol ICC sourcing is preferred. The square contact geometry and slightly shorter mating contact length (0.228" vs. 0.240") require verification for mechanical fit in the mating connector. RoHS compliance is confirmed; operating temperature and current rating specifications are not provided in the data sheet.

N3428-6002RB (3M - 3000 Series): This substitute accommodates applications requiring higher current capacity (1.75A vs. 1A) with extended post length (0.112"). The operating temperature range is -55°C to 105°C, which is 20°C lower than the primary part. Square contact geometry and copper alloy material with tin post finish are specified. Overall contact length is 0.652".

N3428-6003RB (3M - 3000 Series): This substitute provides the longest contact post length (0.155") among all candidates, suitable for applications requiring deeper PCB penetration or thicker substrate accommodation. Current capacity is 1.75A with operating temperature range of -55°C to 105°C. Overall contact length is 0.695". Square contact geometry and copper alloy material with tin post finish are specified.

All substitute parts maintain ROHS3 compliance, UL94 V-0 flammability rating, and push-pull fastening with 4-wall shrouding. Selection depends on specific application requirements for contact post length, current handling, and operating temperature limits.

Frequently Asked Questions (FAQ)

Q: What are the primary differences between the CWN-350-20-0021 and its substitutes?

A: The main differences are contact geometry (circular vs. square), contact post length, current rating capacity, and operating temperature range. The CWN-350-20-0021 features a circular contact with 0.090" post length and 1A current rating. The 3M N3428 series offers higher current capacity (1.75A) with longer post lengths (0.112" or 0.155") but lower maximum operating temperature (105°C vs. 125°C).

Q: Can I use N3428-6003RB as a direct replacement for CWN-350-20-0021?

A: Mechanical compatibility depends on the mating connector and PCB design. The N3428-6003RB has a significantly longer contact post (0.155" vs. 0.090"), which may affect fit in the mating connector or require PCB thickness adjustment. Verify mating connector specifications and PCB hole depth before substitution.

Q: What is the difference between N3428-6002RB and N3428-6003RB?

A: Both parts are from the 3M 3000 Series with identical electrical and mechanical specifications except for contact post length. The N3428-6002RB has a 0.112" post length with 0.652" overall contact length, while the N3428-6003RB has a 0.155" post length with 0.695" overall contact length. Selection depends on required PCB penetration depth.

Q: Are all substitute parts RoHS compliant?

A: Yes. The CWN-350-20-0021, N3428-6002RB, and N3428-6003RB are ROHS3 compliant. The 71918-020LF is RoHS compliant. All parts meet environmental compliance requirements.

Q: What is the current rating difference between the main part and 3M substitutes?

A: The CWN-350-20-0021 is rated for 1A, while both 3M N3428 series parts (N3428-6002RB and N3428-6003RB) are rated for 1.75A. Applications requiring higher current capacity should use the 3M alternatives.

Q: Does the contact shape difference (circular vs. square) affect compatibility?

A: Contact shape affects mating connector compatibility. The CWN-350-20-0021 uses circular contacts, while the 71918-020LF and both 3M N3428 parts use square contacts. Verify that the mating connector is designed to accept the specific contact geometry before substitution.

Q: What is the maximum operating temperature for each part?

A: The CWN-350-20-0021 operates from -55°C to 125°C. The 71918-020LF operating temperature is not specified. Both 3M N3428 parts operate from -55°C to 105°C. Applications requiring operation above 105°C must use the CWN-350-20-0021.

Q: What packaging options are available?

A: The CWN-350-20-0021 is supplied in Bulk packaging. The 71918-020LF is supplied in Tube packaging. Both 3M N3428 parts are supplied in Bulk packaging. Packaging selection may affect order quantities and handling requirements.

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