M20-9721945 Equivalent & Substitute Parts

Part Overview

The M20-9721945 is a vertical rectangular connector header manufactured by Harwin Inc., featuring 38 positions with 0.100" (2.54mm) pitch spacing. This through-hole component is designed for board-to-board or cable applications with solder termination and push-pull fastening. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9721945
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	38
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
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 M20-9721945 is determined by strict alignment with the following critical parameters:

Number of Positions: 38 (exact match required)
Number of Rows: 2 (exact match required)
Pitch - Mating: 0.100" (2.54mm) (exact match required)
Row Spacing - Mating: 0.100" (2.54mm) (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)
Style: Board to Board or Cable (exact match required)

Substitute parts must maintain these electrical and mechanical parameters to ensure PCB layout compatibility, mating interface consistency, and functional interchangeability. Variations in contact length, contact finish, or insulation material do not preclude substitution provided all critical parameters remain constant.

Parameter Comparison

Parameter	M20-9721945	0702871262	2338-6221-TG	77313-122-38LF	77313-124-38LF	77313-127-38LF	77313-422-38LF	77313-424-38LF	77313-427-38LF	77313-822-38LF
Manufacturer	Harwin Inc.	Molex	3M	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Number of Positions	38	38	38	38	38	38	38	38	38	38
Number of Rows	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)
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)
Contact Type	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
Termination	Solder	Kinked Pin, 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
Operating Temperature	-40°C ~ 105°C	Not specified	-55°C ~ 105°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
Current Rating	3A per Contact	Not specified	3A	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the M20-9721945 across critical mating parameters. Selection should prioritize active product status and compliance certifications:

Recommended Primary Substitutes (Active Status, RoHS3 Compliant):

0702871262 (Molex C-Grid 70287 series) — Active status, ROHS3 compliant, extended operating temperature range
77313-122-38LF, 77313-124-38LF, 77313-127-38LF, 77313-822-38LF (Amphenol ICC BERGSTIK series) — Active status, RoHS compliant, extended operating temperature range to -65°C ~ 130°C

Secondary Substitute (Active Status, RoHS Non-Compliant):

2338-6221-TG (3M 2300 series) — Active status, extended operating temperature range to -55°C ~ 105°C, but RoHS non-compliant; suitable only for applications where RoHS compliance is not required

The Amphenol ICC BERGSTIK series variants (77313-122-38LF, 77313-124-38LF, 77313-127-38LF, 77313-422-38LF, 77313-424-38LF, 77313-427-38LF, 77313-822-38LF) differ primarily in contact length and contact finish specifications. Selection among these variants depends on specific PCB stack-up requirements and environmental exposure conditions. All maintain identical pitch, position count, and fastening characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use a 48-position header (M20-9722445) as a substitute for the 38-position M20-9721945?

A: No. The M20-9722445 has 48 positions versus 38 positions in the original part. Position count is a critical parameter that determines PCB layout compatibility and mating interface geometry. Substitution requires exact position matching.

Q: What is the difference between the various Amphenol ICC BERGSTIK variants (77313-122-38LF, 77313-124-38LF, 77313-127-38LF)?

A: These parts differ in contact length specifications. The 77313-122-38LF has a mating contact length of 0.305" (7.75mm), the 77313-124-38LF has 0.266" (6.75mm), and the 77313-127-38LF has 0.260" (6.60mm). Contact length affects the depth of insertion into the mating connector. Selection depends on your specific PCB stack-up and mating connector specifications.

Q: Is the 2338-6221-TG (3M) suitable for new designs?

A: The 2338-6221-TG is active and electrically compatible, but it is RoHS non-compliant. It is suitable only for applications where RoHS compliance is not a requirement. For new designs targeting RoHS compliance, select from the Molex 0702871262 or Amphenol ICC BERGSTIK series alternatives.

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

A: Contact finish affects corrosion resistance and mating force characteristics. Gold-plated contacts (77313-122-38LF, 77313-124-38LF, 77313-127-38LF, 77313-822-38LF) provide superior corrosion resistance and lower contact resistance. Tin-plated contacts (77313-422-38LF, 77313-424-38LF, 77313-427-38LF) are cost-effective alternatives suitable for standard industrial applications. Both finishes meet UL94 V-0 flammability requirements and support 3A per contact current rating.

Q: Are all substitute parts rated for the same current and temperature range?

A: Current rating is consistent at 3A per contact across all substitutes. Operating temperature ranges vary: the original M20-9721945 is rated -40°C ~ 105°C, while Amphenol ICC BERGSTIK and Molex alternatives extend to -65°C ~ 130°C, and the 3M alternative to -55°C ~ 105°C. Verify your application temperature requirements before selection.

Q: Can I mix different substitute part numbers in the same design?

A: All listed substitutes maintain identical pitch (0.100"), position count (38), row configuration (2 rows), and fastening type (push-pull). They are mechanically and electrically interchangeable at the PCB interface. However, for production consistency and supply chain management, standardizing on a single part number is recommended.

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