M20-9701645 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The M20-9701645 is a right-angle rectangular connector header manufactured by Harwin Inc., designed for through-hole mounting with 32 positions at 0.100" (2.54mm) pitch. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The connector features unshrouded male pins with solder termination and push-pull fastening, suitable for board-to-board or cable applications in industrial and commercial electronics.

Key Parameters

Parameter	Value
Connector Type	Header, Right Angle
Number of Positions	32
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, Right Angle
Termination	Solder
Fastening Type	Push-Pull
Shrouding	Unshrouded
Current Rating	3A per Contact
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9701645 is determined by strict alignment with the following critical parameters:

Connector Configuration: 32 positions, 2 rows, 0.100" (2.54mm) pitch and row spacing
Physical Form Factor: Right-angle through-hole mounting with unshrouded design
Electrical Characteristics: Male pin contact type with solder termination and push-pull fastening
Environmental Compliance: UL94 V-0 flammability rating and ROHS3 compliance
Thermal Performance: Operating temperature range of -40°C to 105°C minimum

The substitute parts listed below meet all mandatory parameters. Variations in contact length, contact material composition, and current rating specifications are documented in the parameter comparison table and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	M20-9701645 (Harwin)	61303221021 (Würth Elektronik)	961232-5804-AR (3M)
Manufacturer	Harwin Inc.	Würth Elektronik	3M
Product Status	Obsolete	Active	Active
Number of Positions	32	32	32
Number of Rows	2	2	2
Pitch - Mating	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)
Contact Type	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Termination	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull
Shrouding	Unshrouded	Unshrouded	Unshrouded
Contact Length - Mating	0.276" (7.00mm)	0.236" (6.00mm)	0.272" (6.90mm)
Contact Length - Post	0.118" (3.00mm)	0.118" (3.00mm)	0.130" (3.30mm)
Insulation Height	0.200" (5.08mm)	0.200" (5.08mm)	0.197" (5.00mm)
Contact Material	Brass	Copper Alloy	Copper Alloy
Contact Finish - Mating	Gold	Gold	Gold (Flash)
Current Rating	3A per Contact	3A	2A
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-25°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

61303221021 (Würth Elektronik WR-PHD Series)

This substitute maintains active product status with full ROHS3 compliance and identical electrical ratings (3A per contact). The connector meets all critical dimensional and functional parameters. Contact length variation of 0.040" (1.00mm) on the mating side and equivalent post length represent minor dimensional differences within typical PCB design tolerances. The Würth part is suitable for direct substitution in applications where the original M20-9701645 was specified.

961232-5804-AR (3M 961 Series)

This substitute is active and RoHS compliant with UL94 V-0 flammability rating. The current rating is reduced to 2A per contact, which represents a functional limitation compared to the original 3A specification. The operating temperature minimum is -25°C versus -40°C on the original part. Contact length variations are minimal (0.004" on mating side, 0.012" on post side). This part is suitable for applications where the 2A current rating and -25°C minimum temperature are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 61303221021 directly replace the M20-9701645 in existing designs?

A: Yes. The Würth Elektronik 61303221021 maintains identical pitch, row spacing, position count, and current rating specifications. Minor contact length differences (0.040" on mating side) are within standard PCB design tolerances and do not affect mechanical or electrical compatibility.

Q: What is the primary limitation of the 961232-5804-AR substitute?

A: The 3M part has a reduced current rating of 2A per contact compared to the original 3A specification, and a minimum operating temperature of -25°C instead of -40°C. Applications requiring the full 3A rating or operation below -25°C must use the Würth Elektronik alternative.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 61303221021 is ROHS3 compliant, and the 961232-5804-AR is RoHS compliant. Both meet environmental regulatory requirements for lead-free manufacturing.

Q: How do contact material differences affect performance?

A: The original M20-9701645 uses brass contacts, while both substitutes use copper alloy. Copper alloy contacts provide equivalent electrical conductivity and corrosion resistance for standard applications. Gold plating on all parts ensures reliable mating surface performance.

Q: What packaging considerations apply to these substitutes?

A: The Würth Elektronik 61303221021 is supplied in bulk packaging. The 3M 961232-5804-AR packaging specification is not detailed in the provided data. Verify packaging requirements with your procurement process.

Q: Are there any temperature-related constraints for substitute selection?

A: The M20-9701645 and 61303221021 both operate from -40°C to 105°C. The 3M part operates from -25°C to 105°C. Applications requiring operation below -25°C must use the Würth Elektronik substitute.

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