M20-9732145 Equivalent & Substitute Parts

Part Overview

The Harwin M20-9732145 is a vertical through-hole rectangular connector header with 21 positions at 0.100" (2.54mm) pitch. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design work, production continuity, and system maintenance. The part features unshrouded male pins with solder termination, gold-plated mating contacts, and brass construction suitable for board-to-board or cable applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9732145
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	21
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Contact Material	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T
Operating Temperature	-40°C ~ 105°C
Current Rating	3A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9732145 is determined by the following critical parameters:

Pitch - Mating: 0.100" (2.54mm) — exact match required
Number of Positions: 21 — exact match required
Number of Rows: 1 — exact match required
Contact Type: Male Pin — exact match required
Mounting Type: Through Hole — exact match required
Termination: Solder — exact match required
Connector Style: Board to Board or Cable — exact match required
Shrouding: Unshrouded — exact match required
Fastening Type: Push-Pull — exact match required
Material Flammability Rating: UL94 V-0 — minimum requirement

All substitute parts listed below meet these core electrical and mechanical compatibility criteria. Variations in contact length, insulation height, contact finish composition, and insulation material do not prevent functional substitution when mating with standard 2.54mm pitch receptacles.

Parameter Comparison

Parameter	M20-9732145 (Harwin)	0022284211 (Molex)	0022284214 (Molex)	4-103321-0-21 (TE)	7-146276-1 (TE)	77311-124-21LF (Amphenol)	77311-127-21LF (Amphenol)	890-70-021-10-002101 (Preci-Dip)	BHS-121-T-A (Samtec)
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	21	21	21	21	21	21	21	21	21
Number of Rows	1	1	1	1	1	1	1	1	1
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Shrouding	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded
Contact Finish - Mating	Gold	Tin	Gold	Tin-Lead	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold	Tin
Contact Material	Brass	—	—	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Brass	—
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA), Nylon, Glass Filled	Polyamide (PA), Nylon, Glass Filled	Thermoplastic	Liquid Crystal Polymer (LCP)	Thermoplastic	Thermoplastic	Polyamide (PA), Nylon, Glass Filled	Liquid Crystal Polymer (LCP), Glass Filled
Operating Temperature	-40°C ~ 105°C	—	—	-65°C ~ 105°C	-65°C ~ 105°C	-65°C ~ 125°C	-65°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	3A per Contact	—	—	3A	3A	3A per Contact	3A per Contact	3A	—
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance)

The following parts are recommended as primary substitutes due to active product status and ROHS3 compliance:

0022284211 (Molex KK254): Active status, ROHS3 compliant. Tin-plated mating contacts differ from the original gold finish. Suitable for applications where contact finish composition is not a critical constraint.
0022284214 (Molex KK254): Active status, ROHS3 compliant. Gold-plated mating contacts match the original specification. Recommended for direct replacement in gold-contact applications.
7-146276-1 (TE Connectivity AMPMODU Mod II): Active status, RoHS compliant. Gold-plated mating contacts with extended operating temperature range (-65°C ~ 105°C). Copper alloy construction provides alternative material composition.
77311-124-21LF (Amphenol ICC BERGSTIK®): Active status, RoHS compliant. Gold-plated mating contacts with extended operating temperature range (-65°C ~ 125°C). Phosphor bronze contact material and thermoplastic insulation offer alternative construction.
77311-127-21LF (Amphenol ICC BERGSTIK®): Active status, RoHS compliant. Gold-plated mating contacts with extended operating temperature range (-65°C ~ 125°C). Identical electrical and mechanical compatibility to 77311-124-21LF with minor contact length variation.
890-70-021-10-002101 (Preci-Dip 890 Series): Active status, ROHS3 compliant. Gold-plated mating contacts with extended operating temperature range (-55°C ~ 125°C). Brass construction matches original material composition.

Secondary Substitute (Discontinued Status)

4-103321-0-21 (TE Connectivity AMPMODU Mod II): Discontinued at DiGi Electronics, RoHS non-compliant. Tin-lead plated contacts and non-compliant RoHS status limit suitability for new designs. Acceptable only for legacy system maintenance where RoHS compliance is not required.

Alternative Consideration (Design Variation)

BHS-121-T-A (Samtec BHS Series): Active status, ROHS3 compliant. Circular contact shape and tin finish differ from the original square gold-plated design. Insulation height (0.210") and contact length (0.125") differ significantly. Functional compatibility with standard 2.54mm pitch receptacles is maintained, but mechanical fit and contact engagement characteristics may differ. Evaluate mechanical fit in target application before selection.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different contact finish (tin vs. gold)?

A: Contact finish differences do not prevent electrical substitution. Tin-plated contacts (0022284211, BHS-121-T-A) function with standard 2.54mm pitch receptacles. Gold-plated contacts (0022284214, 7-146276-1, 77311-124-21LF, 77311-127-21LF, 890-70-021-10-002101) provide enhanced corrosion resistance and are preferred for applications requiring long-term reliability or exposure to corrosive environments.

Q: What is the difference between the two Molex KK254 options (0022284211 vs. 0022284214)?

A: Both parts are electrically and mechanically identical with 21 positions at 0.100" pitch. The primary difference is contact finish: 0022284211 features tin-plated mating contacts, while 0022284214 features gold-plated mating contacts. Select based on application requirements for contact finish performance.

Q: Are the TE Connectivity AMPMODU Mod II parts (4-103321-0-21 vs. 7-146276-1) interchangeable?

A: Both parts share identical pitch, position count, and mounting characteristics. The key differences are product status and RoHS compliance. 4-103321-0-21 is discontinued and RoHS non-compliant, while 7-146276-1 is active and RoHS compliant. For new designs, select 7-146276-1. For legacy system maintenance, 4-103321-0-21 remains functionally compatible if RoHS compliance is not required.

Q: Do the Amphenol BERGSTIK® parts (77311-124-21LF vs. 77311-127-21LF) have different electrical performance?

A: Both parts are electrically identical with 21 positions at 0.100" pitch and 3A current rating. The difference is contact length: 77311-124-21LF has 0.266" mating contact length, while 77311-127-21LF has 0.260" mating contact length. This variation does not affect electrical performance with standard receptacles. Select based on mechanical fit requirements in your application.

Q: Why is the Samtec BHS-121-T-A listed as an alternative rather than a primary substitute?

A: The BHS-121-T-A features circular contact geometry instead of square, and has significantly different insulation height (0.210" vs. 0.100") and contact length (0.125" vs. 0.276"). While it maintains 0.100" pitch and 21-position compatibility, the mechanical design differs substantially. Functional compatibility with standard 2.54mm pitch receptacles is maintained, but mechanical fit and contact engagement must be evaluated for your specific application before selection.

Q: Which substitute part best matches the original M20-9732145 specification?

A: The 890-70-021-10-002101 (Preci-Dip 890 Series) provides the closest match: brass contact material, gold-plated mating finish, and polyamide insulation material all match the original. It is active, ROHS3 compliant, and offers extended operating temperature range (-55°C ~ 125°C). The 0022284214 (Molex KK254) is also a strong match with gold-plated contacts and active status, though it uses glass-filled polyamide insulation.

Q: Can I use these substitutes in applications requiring RoHS compliance?

A: Most substitutes are RoHS compliant. The 4-103321-0-21 (TE Connectivity) is RoHS non-compliant and unsuitable for RoHS-regulated applications. All other listed parts (0022284211, 0022284214, 7-146276-1, 77311-124-21LF, 77311-127-21LF, 890-70-021-10-002101, BHS-121-T-A) are RoHS compliant or ROHS3 compliant.

Q: What is the inventory availability of these substitute parts?

A: All substitute parts listed have confirmed inventory: 798 pcs (0022284211), 926 pcs (0022284214), 929 pcs (4-103321-0-21), 990 pcs (7-146276-1), 737 pcs (77311-124-21LF), 1007 pcs (77311-127-21LF), 685 pcs (890-70-021-10-002101), and 701 pcs (BHS-121-T-A). Verify current availability with your supplier before finalizing procurement.

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