Harwin M20-9732146 Equivalent & Substitute Parts

Part Overview

The Harwin M20-9732146 is a rectangular connector header with 21 vertical positions at 0.100" (2.54mm) pitch, designed for through-hole mounting with solder termination. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The connector features unshrouded, cuttable design with male pins, brass contacts, and polyamide insulation rated for -40°C to 105°C operation at 3A per contact.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9732146
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Description	CONN HEADER VERT 21POS 2.54MM
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
Fastening Type	Push-Pull
Contact Shape	Square
Contact Finish - Mating	Tin
Contact Material	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
Insulation Color	Black
Current Rating	3A per Contact
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9732146 is determined by the following critical parameters:

Core Compatibility Requirements:

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
Fastening Type: Push-Pull — exact match required
Contact Shape: Square — exact match required
Insulation Color: Black — exact match required

Acceptable Variations:

Contact Finish - Mating: Tin or Gold (both acceptable for general-purpose applications)
Insulation Material: Polyamide (PA), Nylon, Liquid Crystal Polymer (LCP), or Thermoplastic (all acceptable)
Contact Material: Brass or Copper Alloy (both acceptable)
Operating Temperature Range: May exceed the original -40°C ~ 105°C specification
Product Status: Active or Discontinued parts are acceptable; Obsolete status is the reason for substitution

All identified substitute parts meet these core requirements and are electrically and mechanically compatible with the original M20-9732146.

Parameter Comparison

Parameter	M20-9732146 (Harwin)	0022284211 (Molex)	0022284214 (Molex)	4-103321-0-21 (TE)	7-146276-1 (TE)	77311-124-21LF (Amphenol)	77311-127-21LF (Amphenol)	890-80-021-10-002101 (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
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square	Circular
Contact Finish - Mating	Tin	Tin	Gold	Tin-Lead	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Tin	Tin
Contact Material	Brass	Not specified	Not specified	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Brass	Not specified
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	Not specified	Not specified	-65°C ~ 105°C	-65°C ~ 105°C	-65°C ~ 125°C	-65°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
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	Not specified
Insulation Color	Black	Black	Black	Black	Black	Black	Black	Black	Black
Current Rating	3A per Contact	Not specified	Not specified	3A	3A	3A per Contact	3A per Contact	3A	Not specified
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

The Molex 0022284211 and 0022284214 (KK254 series) are recommended as primary substitutes. Both parts are in active production status with ROHS3 compliance. The 0022284211 features tin mating finish matching the original specification, while the 0022284214 provides gold mating finish for enhanced corrosion resistance. Both are electrically and mechanically compatible with the M20-9732146.

The TE Connectivity 7-146276-1 (AMPMODU Mod II series) is an active substitute with RoHS compliance and extended operating temperature range (-65°C ~ 105°C). This part features gold mating finish and copper alloy contacts with liquid crystal polymer insulation.

The Amphenol ICC 77311-124-21LF and 77311-127-21LF (BERGSTIK series) are active substitutes with RoHS compliance and the highest operating temperature rating (-65°C ~ 125°C). Both feature phosphor bronze contacts and gold mating finish. These parts differ in contact length specifications but maintain full electrical compatibility.

The Preci-Dip 890-80-021-10-002101 (Series 890) is an active substitute with ROHS3 compliance, matching the original tin mating finish and brass contact material. This part includes voltage rating specification (150VDC) and extended temperature range (-55°C ~ 125°C).

Secondary Substitute (Discontinued Status):

The TE Connectivity 4-103321-0-21 (AMPMODU Mod II series) is discontinued at DiGi Electronics and carries RoHS non-compliance status. This part is electrically compatible but should be selected only when primary substitutes are unavailable and RoHS compliance is not required.

Alternative Consideration (Design Variation):

The Samtec BHS-121-T-A features circular contact shape rather than square, representing a design variation. While mechanically compatible in pitch and position count, this part introduces a different contact geometry and should be evaluated for specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the M20-9732146?

A: All listed substitutes meet the core compatibility requirements: 21 positions, 0.100" (2.54mm) pitch, single row, male pins, through-hole mounting, solder termination, and push-pull fastening. Electrical and mechanical compatibility is confirmed. Selection should consider product status, RoHS compliance requirements, and operating temperature needs for your specific application.

Q: What is the difference between tin and gold mating finish options?

A: Tin finish (0022284211, M20-9732146, 890-80-021-10-002101) provides standard corrosion resistance suitable for general-purpose applications. Gold finish (0022284214, 7-146276-1, 77311-124-21LF, 77311-127-21LF) offers enhanced corrosion resistance and lower contact resistance, beneficial for high-reliability or harsh environment applications. Both finishes are electrically compatible with the original design.

Q: Why is the TE Connectivity 4-103321-0-21 marked as discontinued?

A: This part is discontinued at DiGi Electronics but remains electrically compatible. However, it carries RoHS non-compliance status. Selection of this part should be limited to applications where RoHS compliance is not mandated and availability from alternative distributors is confirmed.

Q: What is the significance of operating temperature range differences?

A: The original M20-9732146 operates from -40°C to 105°C. Substitute parts with extended ranges (-55°C ~ 125°C or -65°C ~ 125°C) provide additional thermal margin and are suitable for applications requiring broader temperature operation. Parts with unspecified temperature ranges should be evaluated against application requirements.

Q: Are there any contact geometry differences I should be aware of?

A: The Samtec BHS-121-T-A features circular contacts instead of square. All other substitutes maintain square contact geometry matching the original. Contact geometry affects mating force and connector feel but does not impact electrical performance for standard applications.

Q: Which substitute offers the best long-term availability?

A: The Molex KK254 series (0022284211, 0022284214) and TE Connectivity 7-146276-1 are in active production status, indicating strong long-term availability. The Amphenol BERGSTIK series and Preci-Dip Series 890 are also active. These should be prioritized for new designs requiring sustained component supply.

Q: Do all substitutes maintain the 3A per contact current rating?

A: The M20-9732146, 4-103321-0-21, 7-146276-1, 77311-124-21LF, 77311-127-21LF, and 890-80-021-10-002101 all specify 3A per contact. The Molex parts (0022284211, 0022284214) and Samtec BHS-121-T-A do not specify current rating but are electrically compatible. Verify current requirements against application specifications.

Q: What packaging options are available?

A: Substitute parts are available in Bulk, Tube, or unspecified packaging. Packaging selection should align with production volume and handling requirements. Consult distributor availability for specific packaging preferences.

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