M20-9971246 Equivalent & Substitute Parts

Part Overview

The M20-9971246 is a rectangular connector header manufactured by Harwin Inc., designed for through-hole mounting in board-to-board or cable applications. This connector features 24 positions arranged in 2 rows with 0.100" (2.54mm) pitch spacing and is rated for 3A per contact at operating temperatures from -40°C to 105°C. The product is currently obsolete, making identification of equivalent and substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9971246
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Series	M20
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	24
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Current Rating	3A per Contact
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the M20-9971246 is based on the following critical parameters that must remain consistent:

Manufacturer Series: M20 (Harwin Inc.)
Connector Type: Header, Cuttable
Contact Type: Male Pin
Pitch - Mating: 0.100" (2.54mm)
Row Spacing - Mating: 0.100" (2.54mm)
Mounting Type: Through Hole
Termination: Solder
Current Rating: 3A per Contact
Operating Temperature Range: -40°C ~ 105°C
Material Flammability Rating: UL94 V-0
Insulation Material: Polyamide (PA6T), Nylon 6T
Contact Material: Brass with Tin finish

The substitute part M20-9973646 maintains all critical electrical and mechanical parameters. The primary difference is the number of positions (72 vs. 24), which allows this part to serve applications requiring higher position counts while maintaining full compatibility with the M20 series specifications and performance characteristics.

Parameter Comparison

Parameter	M20-9971246 (Main Part)	M20-9973646 (Substitute)
Manufacturer	Harwin Inc.	Harwin Inc.
Series	M20	M20
Connector Type	Header, Cuttable	Header, Cuttable
Contact Type	Male Pin	Male Pin
Number of Positions	24	72
Number of Rows	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Contact Length - Mating	0.335" (8.51mm)	0.335" (8.51mm)
Contact Length - Post	0.116" (2.95mm)	0.116" (2.95mm)
Overall Contact Length	0.551" (14.00mm)	0.551" (14.00mm)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)
Contact Shape	Square	Square
Contact Finish - Mating	Tin	Tin
Contact Material	Brass	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Insulation Color	Black	Black
Current Rating	3A per Contact	3A per Contact
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The M20-9973646 is the designated substitute for the obsolete M20-9971246. Both parts are manufactured by Harwin Inc. within the M20 series and maintain identical electrical and mechanical specifications across all critical parameters including pitch, contact rating, operating temperature range, and material compliance.

The M20-9973646 carries Active product status, ensuring ongoing availability and manufacturing support. Both parts maintain ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

The primary design consideration is the position count difference: the substitute provides 72 positions versus the original 24 positions. The cuttable header design of both parts allows the M20-9973646 to be configured to match the original 24-position requirement through mechanical modification, or to serve applications requiring the full 72-position capacity.

Frequently Asked Questions (FAQ)

Q: Can M20-9973646 directly replace M20-9971246 in existing designs?

A: The M20-9973646 maintains all electrical and mechanical specifications of the M20-9971246. Both parts share identical pitch (0.100"), contact rating (3A), operating temperature range (-40°C to 105°C), and material properties. The substitute is compatible with existing PCB footprints designed for the original part. The increased position count (72 vs. 24) does not affect compatibility for applications using only 24 positions.

Q: What is the significance of the cuttable header design?

A: Both the M20-9971246 and M20-9973646 feature cuttable header construction, allowing the connector to be segmented to the required number of positions. This design enables the 72-position M20-9973646 to be mechanically configured to provide 24 positions if needed for exact form-factor matching.

Q: Are there compliance differences between the main part and substitute?

A: No. Both parts maintain identical compliance certifications: ROHS3 Compliant, REACH Unaffected status, UL94 V-0 flammability rating, and Moisture Sensitivity Level 1 (Unlimited). Regulatory requirements are fully satisfied by either part.

Q: Why is the original part obsolete while the substitute is active?

A: The M20-9971246 has been discontinued by Harwin Inc., while the M20-9973646 remains in active production. The substitute part provides equivalent functionality with the advantage of ongoing manufacturing support and availability.

Q: Are there packaging differences?

A: The M20-9971246 packaging information is not specified in available documentation. The M20-9973646 is supplied in Bulk packaging. Packaging format should be confirmed with the supplier for procurement requirements.

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