M20-9723646 Equivalent & Substitute Parts

Part Overview

The Harwin M20-9723646 is a rectangular connector header for through-hole mounting with 72 positions arranged in 2 rows at 0.100" (2.54mm) pitch. This connector is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part features male pins with tin contact finish, solder termination, and cuttable design suitable for board-to-board or cable applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9723646
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Series	M20
Product Status	Obsolete
Number of Positions	72
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Contact Type	Male Pin
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Tin
Contact Material	Brass
Current Rating	3A per Contact
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the M20-9723646 is determined by strict electrical and mechanical compatibility across the following parameters:

Primary Substitution Criteria:

Number of Positions: 72
Number of Rows: 2
Pitch - Mating: 0.100" (2.54mm)
Row Spacing - Mating: 0.100" (2.54mm)
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Material Flammability Rating: UL94 V-0
Current Rating: 3A per Contact
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Contact Finish - Mating: Tin or Gold (both acceptable for electrical continuity)
Contact Material: Brass or Phosphor Bronze (both acceptable for electrical performance)
Insulation Material: Polyamide (PA6T), Nylon 6T, or Thermoplastic (all acceptable)
Operating Temperature Range: Must meet or exceed -40°C ~ 105°C
RoHS Status: ROHS3 Compliant or RoHS Compliant

Substitute parts are grouped by manufacturer and connector type variant (standard header vs. breakaway header), with variations in contact length, post length, and contact finish thickness noted as secondary design considerations.

Parameter Comparison

Parameter	M20-9723646	M20-9723645	450-10-272-00-018101	68481-172HLF	68491-272HLF	77313-124-72LF	77313-127-72LF	77313-424-72LF	77313-824-72LF	77313-827-72LF	78286-172H
Manufacturer	Harwin Inc.	Harwin Inc.	Preci-Dip	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Number of Positions	72	72	72	72	72	72	72	72	72	72	72
Number of Rows	2	2	2	2	2	2	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)	0.100" (2.54mm)	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)	0.100" (2.54mm)	0.100" (2.54mm)	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	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	Through Hole	Through Hole
Termination	Solder	Solder	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	Push-Pull	Push-Pull
Contact Finish - Mating	Tin	Gold	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Tin	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™
Contact Material	Brass	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Current Rating	3A per Contact	3A per Contact	3A	3A	3A	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	—
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-55°C ~ 125°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°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	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS non-compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: M20-9723645

The M20-9723645 from Harwin Inc. is the direct active equivalent to the obsolete M20-9723646. Both parts share identical mechanical and electrical specifications with the exception of contact finish (gold vs. tin). The M20-9723645 maintains ROHS3 compliance and active product status, ensuring long-term availability and supply chain continuity. This part is preferred for direct replacement in existing designs.

Secondary Recommendations: Amphenol ICC (FCI) BERGSTIK® Series

The Amphenol ICC (FCI) BERGSTIK® II and BERGSTIK® series connectors (68481-172HLF, 68491-272HLF, 77313-124-72LF, 77313-127-72LF, 77313-424-72LF, 77313-824-72LF, 77313-827-72LF, 78286-172H) provide functional equivalence with extended operating temperature ranges (-65°C ~ 130°C) and phosphor bronze contacts. These parts are suitable for applications requiring enhanced thermal performance. Breakaway variants (77313 series) offer additional mechanical flexibility for board separation applications.

Alternative Recommendation: Preci-Dip 450-10-272-00-018101

The Preci-Dip 450-10-272-00-018101 provides functional equivalence with extended operating temperature range (-55°C ~ 125°C) and gold-plated contacts. This part is suitable for applications requiring enhanced corrosion resistance and thermal performance beyond the original specification.

Compliance Considerations:

All recommended substitutes maintain UL94 V-0 flammability rating and MSL 1 (Unlimited) moisture sensitivity level. The M20-9723645, 450-10-272-00-018101, and all Amphenol ICC (FCI) parts except 78286-172H maintain RoHS compliance. The 78286-172H is RoHS non-compliant and should be avoided for new designs subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can I use M20-9723645 as a direct replacement for M20-9723646?

A: Yes. The M20-9723645 is the active equivalent with identical mechanical and electrical specifications. The only difference is the contact finish (gold vs. tin), which does not affect electrical performance or mechanical compatibility. The M20-9723645 is the recommended replacement.

Q: What is the difference between standard header and breakaway header variants?

A: Standard header variants (68481-172HLF, 68491-272HLF, 78286-172H) are fixed connectors. Breakaway header variants (77313 series) feature cuttable or separable design, allowing individual rows or sections to be removed for custom configurations. Both types maintain identical pitch, position count, and electrical ratings.

Q: Are Amphenol ICC (FCI) BERGSTIK® connectors compatible with the original M20-9723646?

A: Yes. All BERGSTIK® variants meet the core substitution criteria: 72 positions, 2 rows, 0.100" (2.54mm) pitch, male pins, through-hole solder termination, and 3A per contact current rating. Mechanical compatibility is maintained across all variants. Extended operating temperature ranges and phosphor bronze contacts provide enhanced performance for demanding applications.

Q: What are the contact length differences between substitute parts?

A: Contact length variations exist across substitute parts but do not affect electrical or mechanical compatibility within the 2.54mm pitch standard. Contact lengths range from 0.169" (4.30mm) to 0.285" (7.24mm) for mating contacts and 0.095" (2.41mm) to 0.160" (4.06mm) for posts. These variations accommodate different PCB thicknesses and mating depths. Verify contact length compatibility with your specific application requirements.

Q: Which substitute parts are RoHS compliant?

A: M20-9723645, 450-10-272-00-018101, 68481-172HLF, 68491-272HLF, 77313-124-72LF, 77313-127-72LF, 77313-424-72LF, 77313-824-72LF, and 77313-827-72LF are all RoHS compliant. The 78286-172H is RoHS non-compliant and should not be used in applications subject to RoHS regulations.

Q: What is the difference between tin and gold contact finishes?

A: Tin contact finish (M20-9723646, 77313-424-72LF) provides cost-effective electrical continuity suitable for standard applications. Gold contact finish (M20-9723645, 450-10-272-00-018101, and most Amphenol ICC variants) provides enhanced corrosion resistance and is preferred for applications requiring long-term reliability or exposure to corrosive environments. Both finishes are electrically compatible.

Q: Can I mix different substitute parts in the same assembly?

A: All substitute parts maintain identical pitch, position count, and electrical ratings, allowing functional interchangeability. However, physical dimensions (contact length, overall height) vary between manufacturers and series. Verify that all connectors in an assembly have compatible mating depths and stacking heights for your specific application.

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