M20-9972046 Equivalent & Substitute Parts

Part Overview

The M20-9972046 is a rectangular connector header manufactured by Harwin Inc., featuring a vertical through-hole mount configuration with 40 positions at 2.54mm pitch. This connector is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part operates within the -40°C to 105°C temperature range and is rated for 3A per contact with UL94 V-0 flammability compliance.

Key Parameters

Parameter	M20-9972046 Specification
Manufacturer	Harwin Inc.
Connector Type	Header, Cuttable
Number of Positions	40
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 Material	Brass
Contact Finish - Mating	Tin
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

Substitute parts for the M20-9972046 are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

Number of Positions: 40
Pitch - Mating: 0.100" (2.54mm)
Number of Rows: 2
Row Spacing - Mating: 0.100" (2.54mm)
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Current Rating: 3A per Contact
Material Flammability Rating: UL94 V-0

All substitute parts listed maintain these core parameters. Variations in contact material, contact finish, insulation material, and operating temperature ranges are secondary considerations that do not preclude substitution when the primary electrical and mechanical specifications align.

Parameter Comparison

Parameter	M20-9972046	M20-9973646	77313-115-40LF	78548-140HLF	892-70-040-10-003101	EW-20-10-L-D-270	HTSW-120-42-F-D	HTSW-120-42-G-D	HTSW-120-42-L-D	HTSW-120-42-S-D	HTSW-120-42-T-D
Manufacturer	Harwin Inc.	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Preci-Dip	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Number of Positions	40	72	40	40	40	40	40	40	40	40	40
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	Kinked Pin, Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Material	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Contact Finish - Mating	Tin	Tin	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold	Gold	Gold	Gold	Gold	Gold	Tin
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-65°C ~ 130°C	Not Specified	-55°C ~ 125°C	Not Specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 105°C
Current Rating	3A per Contact	3A per Contact	3A per Contact	Not Specified	3A	Not Specified	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge
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	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: M20-9973646

The M20-9973646 from Harwin Inc. is the manufacturer-recommended substitute. This part maintains identical electrical and mechanical specifications to the M20-9972046, including pitch, row spacing, contact type, and current rating. Both parts share the same insulation material (Polyamide PA6T, Nylon 6T), operating temperature range (-40°C to 105°C), and flammability rating (UL94 V-0). The M20-9973646 is active in production with 747 units in stock, ensuring supply continuity. ROHS3 compliance is maintained.

Secondary Recommendations: Amphenol ICC (FCI) Series

The 77313-115-40LF (BERGSTIK® series) and 78548-140HLF (BERGSTIK® II series) from Amphenol ICC (FCI) provide active alternatives with identical position count, pitch, and row spacing. Both maintain 40-position, 2-row configurations at 0.100" (2.54mm) pitch with male pin contacts and through-hole solder termination. The 77313-115-40LF offers an extended operating temperature range (-65°C to 130°C) and is RoHS compliant. The 78548-140HLF features kinked pin termination for enhanced mechanical retention.

Tertiary Recommendations: Preci-Dip and Samtec Series

The 892-70-040-10-003101 from Preci-Dip maintains full parameter alignment with 40 positions, 2 rows, 0.100" (2.54mm) pitch, and 3A current rating. Operating temperature range extends to -55°C to 125°C with ROHS3 compliance.

The Samtec HTSW series (HTSW-120-42-F-D, HTSW-120-42-G-D, HTSW-120-42-L-D, HTSW-120-42-S-D, HTSW-120-42-T-D) provides multiple contact finish options while maintaining 40-position, 2-row configuration at 0.100" (2.54mm) pitch. These parts feature phosphor bronze contacts with gold or tin finishes and operate across -55°C to 125°C (or -55°C to 105°C for the T-D variant). All are ROHS3 compliant and active in production.

The EW-20-10-L-D-270 from Samtec is a stacking header variant with identical pitch and position count, suitable for applications requiring increased stack height (0.270").

Frequently Asked Questions (FAQ)

Q: Can M20-9973646 be used as a direct replacement for M20-9972046?

A: Yes. The M20-9973646 is the manufacturer-recommended equivalent. Both parts share identical pitch (0.100" / 2.54mm), row spacing (0.100" / 2.54mm), contact type (male pin), mounting method (through-hole solder), current rating (3A per contact), operating temperature range (-40°C to 105°C), and flammability rating (UL94 V-0). The primary difference is position count: M20-9973646 provides 72 positions versus 40 positions in the original part. For applications requiring exactly 40 positions, the cuttable header design of the M20-9973646 allows trimming to the required length.

Q: What are the key differences between Harwin and Amphenol ICC (FCI) substitutes?

A: All listed substitutes maintain the critical 40-position, 2-row, 0.100" (2.54mm) pitch configuration. Harwin parts use brass contacts with tin finish, while Amphenol ICC (FCI) parts employ phosphor bronze contacts with gold or gold GXT™ finish. Amphenol ICC (FCI) parts offer extended operating temperature ranges: 77313-115-40LF operates to -65°C to 130°C versus the original -40°C to 105°C. Both manufacturers maintain UL94 V-0 flammability compliance and RoHS compliance.

Q: Are Samtec HTSW series parts compatible with the M20-9972046 footprint?

A: Samtec HTSW series parts maintain identical pitch (0.100" / 2.54mm), row spacing (0.100" / 2.54mm), and position count (40) specifications. However, contact length and overall connector height differ. HTSW parts feature shorter contact lengths (0.320" mating length versus 0.335" in the original) and reduced overall contact length (0.470" versus 0.551"). These dimensional differences may affect PCB footprint compatibility. Verify mechanical fit before substitution.

Q: What is the significance of contact finish differences (tin versus gold)?

A: Contact finish affects electrical performance and environmental resistance. Tin finish, used in M20-9972046 and M20-9973646, provides cost-effective corrosion resistance suitable for standard applications. Gold finish, used in Amphenol ICC (FCI) and Preci-Dip alternatives, offers superior corrosion resistance and lower contact resistance, beneficial for high-reliability or high-frequency applications. Both finishes maintain the 3A per contact current rating and are suitable for solder termination.

Q: Can parts with "Varies by Wire Gauge" current rating replace the M20-9972046?

A: Samtec HTSW series parts specify current rating as "Varies by Wire Gauge" rather than a fixed 3A per contact. These parts are suitable for applications where wire gauge is controlled and current requirements are verified against the specific wire gauge used. For applications requiring a guaranteed 3A per contact rating independent of wire gauge, Harwin M20-9973646, Amphenol ICC (FCI), or Preci-Dip alternatives are preferred.

Q: What is the difference between cuttable and breakaway connector types?

A: Cuttable headers (M20-9972046, M20-9973646) allow mechanical separation of individual pins or pin groups by cutting the insulation body, enabling custom pin configurations. Breakaway headers (77313-115-40LF) feature perforated insulation that allows individual pins to be removed without cutting. Both designs provide flexibility for applications requiring fewer than the full 40 positions.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain either ROHS3 or RoHS compliance. Harwin and Preci-Dip parts are explicitly ROHS3 compliant. Amphenol ICC (FCI) parts are RoHS compliant. Samtec parts are ROHS3 compliant. All parts meet current regulatory requirements for hazardous substance restrictions.

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