Harwin M20-9742946 Rectangular Connector Header — Equivalent & Substitute Parts

Part Overview

The Harwin M20-9742946 is a through-hole, right-angle rectangular connector header with 58 positions at 2.54mm pitch, designed for board-to-board or cable applications. This part carries an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The connector features male pins with tin-plated brass contacts, solder termination, and push-pull fastening, rated for 3A per contact across an operating temperature range of -40°C to 105°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9742946
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Number of Positions	58
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Contact Type	Male Pin
Termination	Solder
Fastening Type	Push-Pull
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 M20-9742946 is determined by strict alignment of the following critical parameters:

Position Count & Row Configuration: 58 positions, 2 rows
Pitch Specification: 0.100" (2.54mm) mating pitch and row spacing
Mounting & Orientation: Through-hole, right-angle configuration
Contact Type & Termination: Male pins with solder termination
Fastening Mechanism: Push-pull fastening
Current Rating: 3A per contact minimum
Operating Temperature Range: -40°C to 105°C minimum
Flammability & Compliance: UL94 V-0 rating, RoHS3 compliance

Substitute parts are grouped into two categories:

Category A — Direct 58-Position Substitutes (Amphenol ICC BERGSTIK® Series): 77317-103-58LF, 77317-104-58LF, 77317-403-58LF, 77317-404-58LF, 77317-803-58LF, 77317-804-58LF

These parts maintain identical position count, pitch, and mounting configuration. Variations exist in contact material (phosphor bronze vs. brass), contact finish (gold vs. tin), and post length specifications, but all meet the core electrical and mechanical requirements.

Category B — Direct 58-Position Substitute (Sullins Connector Solutions): PREC029DBAN-M71RC

This part matches the 58-position, 2.54mm pitch, and right-angle through-hole configuration with equivalent electrical ratings and compliance certifications.

Category C — Higher-Position Alternative (Harwin M20 Series): M20-9743646

This part provides a 72-position variant within the same Harwin M20 series. It maintains identical pitch, mounting type, and electrical characteristics but offers increased position density. This part is suitable only when the application can accommodate the additional positions.

Parameter Comparison

Parameter	M20-9742946	77317-103-58LF	77317-104-58LF	77317-403-58LF	77317-404-58LF	77317-803-58LF	77317-804-58LF	PREC029DBAN-M71RC	M20-9743646
Manufacturer	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Sullins Connector Solutions	Harwin Inc.
Number of Positions	58	58	58	58	58	58	58	58	72
Number of Rows	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)
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)
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	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Termination	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
Current Rating	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A	3A per Contact
Operating Temperature	-40°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	-40°C ~ 105°C	-40°C ~ 105°C
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
RoHS Status	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (58-Position Requirement):

The Amphenol ICC BERGSTIK® series (77317-103-58LF, 77317-104-58LF, 77317-403-58LF, 77317-404-58LF, 77317-803-58LF, 77317-804-58LF) and Sullins PREC029DBAN-M71RC provide active, production-supported alternatives to the obsolete M20-9742946. All maintain identical position count, pitch, and mounting configuration. The Amphenol parts offer extended operating temperature range (-65°C to 130°C) compared to the original specification, providing additional thermal margin. All substitute parts carry active product status and current RoHS compliance certifications, ensuring long-term availability and regulatory alignment.

For Higher-Position Density (72-Position Requirement):

The Harwin M20-9743646 provides a 72-position variant within the same M20 series, maintaining identical pitch and mounting characteristics. This part is suitable only when the application design can accommodate the additional 14 positions without PCB layout constraints.

Compliance Considerations:

All substitute parts meet or exceed the original UL94 V-0 flammability rating and RoHS compliance requirements. The Amphenol BERGSTIK® parts carry RoHS Compliant status (standard RoHS), while the Harwin and Sullins parts carry ROHS3 Compliant status, reflecting current regulatory requirements. Selection should align with the specific compliance framework required by the end application.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol ICC BERGSTIK® series parts directly replace the Harwin M20-9742946?

A: Yes. The 77317-103-58LF, 77317-104-58LF, 77317-403-58LF, 77317-404-58LF, 77317-803-58LF, and 77317-804-58LF all maintain the same 58-position count, 2.54mm pitch, right-angle through-hole mounting, and 3A per contact current rating. Electrical and mechanical compatibility is established. Variations in contact material (phosphor bronze vs. brass) and contact finish (gold vs. tin) do not affect functional substitution for standard board-to-board applications.

Q: What is the difference between the various Amphenol 77317 part numbers?

A: The differences are in contact post length and contact finish specifications. Parts ending in -03 and -803 have 0.100" (2.54mm) post length, while -04 and -804 have 0.120" (3.05mm) post length. Contact finish varies between tin (77317-403-58LF, 77317-404-58LF) and gold with GXT™ plating (77317-103-58LF, 77317-104-58LF, 77317-803-58LF, 77317-804-58LF). Selection depends on PCB thickness and contact finish requirements for your application.

Q: Is the Sullins PREC029DBAN-M71RC compatible with the original M20-9742946?

A: Yes. The PREC029DBAN-M71RC maintains the same 58-position, 2.54mm pitch, right-angle through-hole configuration, and 3A current rating. It uses brass contacts with tin plating and operates across -40°C to 105°C, matching the original specification. This part is suitable for direct substitution in applications requiring identical thermal and electrical performance.

Q: Can I use the Harwin M20-9743646 (72-position) as a substitute?

A: The M20-9743646 is a higher-position variant within the same Harwin M20 series and maintains identical pitch and mounting type. However, it provides 72 positions instead of 58. This part is suitable only if your PCB layout and application design can accommodate the additional 14 positions without modification. It is not a direct drop-in replacement for space-constrained designs.

Q: What is the difference in operating temperature between the original part and the Amphenol substitutes?

A: The original M20-9742946 operates from -40°C to 105°C. The Amphenol BERGSTIK® series operates from -65°C to 130°C, providing extended thermal range. This extended range does not affect compatibility; it provides additional margin for applications requiring lower minimum or higher maximum operating temperatures.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts carry RoHS compliance certifications. The Harwin M20-9743646 and Sullins PREC029DBAN-M71RC carry ROHS3 Compliant status. The Amphenol BERGSTIK® series carries RoHS Compliant status. Both certifications meet current regulatory requirements; selection should align with your specific compliance framework.

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

A: The Amphenol BERGSTIK® series (77317 variants) are supplied in bag packaging. The Sullins PREC029DBAN-M71RC is supplied in bulk packaging. The Harwin M20-9743646 is supplied in bulk packaging. Packaging selection may affect handling, storage, and procurement logistics but does not affect electrical or mechanical performance.

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