Harwin M20-9701845 Rectangular Connector Header – Equivalent & Substitute Parts

Part Overview

The Harwin M20-9701845 is a through-hole, right-angle rectangular connector header with 36 positions at 2.54mm (0.100") pitch, configured in 2 rows. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production, maintenance, and design continuity. The connector is designed for board-to-board or cable applications with solder termination and push-pull fastening. Identifying functionally equivalent alternatives ensures design flexibility and supply chain resilience.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9701845
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch – Mating	0.100" (2.54mm)
Number of Positions	36
Number of Rows	2
Row Spacing – Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
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

Substitute parts for the M20-9701845 are qualified based on the following critical parameters that must match or exceed the original specification:

Core Matching Criteria:

Pitch – Mating: 0.100" (2.54mm)
Number of Positions: 36
Number of Rows: 2
Row Spacing – Mating: 0.100" (2.54mm)
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole, Right Angle
Termination: Solder
Fastening Type: Push-Pull
Material Flammability Rating: UL94 V-0
Current Rating: 3A per Contact (minimum)
Operating Temperature Range: Must encompass -40°C ~ 105°C

Substitute Parts Identified:

61303621021 (Würth Elektronik WR-PHD Series) – Active product status, meets all core parameters with equivalent electrical and mechanical specifications.
77317-112-36LF (Amphenol ICC BERGSTIK® Series) – Active product status, breakaway header variant, meets all core parameters with extended operating temperature range.
77317-412-36LF (Amphenol ICC BERGSTIK® Series) – Active product status, breakaway header variant with tin mating finish, meets all core parameters with extended operating temperature range.
77317-812-36LF (Amphenol ICC BERGSTIK® Series) – Active product status, breakaway header variant with reduced gold plating thickness, meets all core parameters with extended operating temperature range.
961236-5804-AR (3M Series 961) – Active product status, meets core parameters with equivalent mechanical and electrical specifications.

Parameter Comparison

Parameter	M20-9701845 (Harwin)	61303621021 (Würth)	77317-112-36LF (Amphenol)	77317-412-36LF (Amphenol)	77317-812-36LF (Amphenol)	961236-5804-AR (3M)
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)
Number of Positions	36	36	36	36	36	36
Number of Rows	2	2	2	2	2	2
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)
Connector Type	Header, Cuttable	Header	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Termination	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length – Mating	0.276" (7.00mm)	0.236" (6.00mm)	0.268" (6.80mm)	0.268" (6.80mm)	0.268" (6.80mm)	0.272" (6.90mm)
Contact Length – Post	0.118" (3.00mm)	0.118" (3.00mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.130" (3.30mm)
Insulation Height	0.200" (5.08mm)	0.200" (5.08mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.197" (5.00mm)
Contact Shape	Square	Square	Square	Square	Square	Square
Contact Finish – Mating	Gold	Gold	Gold, GXT™	Tin	Gold, GXT™	Gold
Contact Material	Brass	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Copper Alloy
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°C	-25°C ~ 105°C
Current Rating	3A per Contact	3A	3A per Contact	3A per Contact	3A per Contact	2A
Material Flammability Rating	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	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: 61303621021 (Würth Elektronik WR-PHD Series)

The Würth Elektronik 61303621021 is the most direct functional equivalent. It maintains identical pitch, position count, row configuration, and operating temperature range as the original M20-9701845. Both parts are ROHS3 compliant and UL94 V-0 rated. The Würth part is in active production status, ensuring long-term availability and supply chain stability. Contact length variations are minor and do not affect mechanical compatibility in standard board-to-board applications.

Secondary Recommendations: Amphenol ICC BERGSTIK® Series (77317-112-36LF, 77317-412-36LF, 77317-812-36LF)

The three Amphenol ICC variants offer extended operating temperature range (-65°C ~ 130°C), exceeding the original specification. All three maintain core electrical and mechanical parameters. Selection among these three depends on contact finish requirements:

77317-112-36LF: Gold mating finish (30.0µin thickness)
77317-412-36LF: Tin mating finish
77317-812-36LF: Gold mating finish (15.0µin thickness, reduced plating)

All Amphenol variants feature breakaway header design and are RoHS compliant.

Tertiary Recommendation: 961236-5804-AR (3M Series 961)

The 3M connector meets core substitution criteria with active product status and RoHS compliance. However, the current rating is specified at 2A per contact, which is lower than the original 3A specification. This part is suitable only for applications where the reduced current rating does not impact circuit performance.

Frequently Asked Questions (FAQ)

Q: Can I use the Würth Elektronik 61303621021 as a direct replacement for the Harwin M20-9701845?

A: Yes. Both parts share identical pitch (2.54mm), position count (36), row configuration (2 rows), mounting type (through-hole right-angle), termination method (solder), and fastening type (push-pull). Operating temperature ranges are identical (-40°C ~ 105°C). Contact length variations are within acceptable mechanical tolerances for standard board-to-board applications.

Q: What is the difference between the three Amphenol ICC BERGSTIK® variants?

A: The primary differences are contact finish specifications. The 77317-112-36LF and 77317-812-36LF both feature gold mating finishes but differ in plating thickness (30.0µin versus 15.0µin). The 77317-412-36LF features tin mating finish. All three share identical electrical ratings, operating temperature range, and mechanical dimensions. Selection depends on contact finish requirements for your application.

Q: Why does the 3M 961236-5804-AR have a lower current rating?

A: The 3M connector is specified at 2A per contact, compared to 3A for the original Harwin part. This reflects design differences in contact geometry and material composition. The 3M part is suitable for applications where current per contact does not exceed 2A.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts are RoHS compliant. The original Harwin M20-9701845 is ROHS3 compliant, and all substitutes meet or exceed RoHS requirements.

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

A: The original Harwin part is specified as "cuttable," allowing individual positions to be separated by cutting. The Amphenol ICC variants are specified as "breakaway," allowing individual positions to be separated by breaking. Both design approaches achieve position separation; the method differs. Mechanical compatibility with mating connectors remains equivalent.

Q: Can I use the Amphenol parts in applications requiring the -40°C ~ 105°C temperature range?

A: Yes. The Amphenol ICC BERGSTIK® variants are rated for -65°C ~ 130°C, which encompasses the original -40°C ~ 105°C range. These parts are suitable for the original application and provide additional thermal margin for extended-temperature environments.

Q: What packaging formats are available for these substitute parts?

A: The Würth Elektronik 61303621021 is supplied in bulk packaging. The Amphenol ICC variants (77317-112-36LF, 77317-412-36LF, 77317-812-36LF) are supplied in bag packaging. The 3M 961236-5804-AR packaging format is not specified in available data. Confirm packaging requirements with your procurement process.

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