Equivalent & Substitute Parts for M20-9743446

Part Overview

The Harwin M20-9743446 is a rectangular connector header, right-angle mounted, with 68 positions at 2.54mm pitch. This through-hole component features male pins with tin-plated brass contacts, designed for board-to-board or cable applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuations.

Key Parameters

Parameter	Value
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	68
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Termination	Solder
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 for the M20-9743446 is determined by strict alignment of the following critical parameters:

Position Count & Pitch: 68 positions at 0.100" (2.54mm) mating pitch with 2-row configuration
Mounting Configuration: Through-hole, right-angle orientation
Contact Type: Male pin with solder termination
Electrical Rating: 3A per contact minimum
Environmental Compliance: UL94 V-0 flammability, ROHS3 compliance, MSL 1

Substitute parts are grouped into two categories:

Category A - Direct Position Match (68-Position Headers): Amphenol ICC BERGSTIK® series (77317-103-68LF, 77317-104-68LF, 77317-403-68LF, 77317-404-68LF, 77317-803-68LF, 77317-804-68LF) and Sullins PREC034DBAN-M71RC. These maintain identical position count, pitch, and mounting configuration.

Category B - Position Upgrade (72-Position Header): Harwin M20-9743646 provides a 72-position variant within the same M20 series, suitable for applications requiring additional contact capacity while maintaining mechanical and electrical compatibility through the same pitch and mounting standard.

Parameter Comparison

Parameter	M20-9743446	M20-9743646	77317-103-68LF	77317-104-68LF	77317-403-68LF	77317-404-68LF	77317-803-68LF	77317-804-68LF	PREC034DBAN-M71RC
Manufacturer	Harwin Inc.	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Sullins Connector Solutions
Positions	68	72	68	68	68	68	68	68	68
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
Current Rating (Amps)	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A
Operating Temperature	-40°C ~ 105°C	-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
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	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (68-Position Requirement)

The Amphenol ICC BERGSTIK® series (77317-103-68LF, 77317-104-68LF, 77317-403-68LF, 77317-404-68LF, 77317-803-68LF, 77317-804-68LF) and Sullins PREC034DBAN-M71RC are active products with identical position counts and pitch specifications. All meet UL94 V-0 flammability requirements and MSL 1 moisture sensitivity ratings. The Amphenol parts offer extended operating temperature range (-65°C to 130°C) compared to the original specification (-40°C to 105°C), providing thermal margin for demanding applications. The Sullins part maintains the original temperature range and is ROHS3 compliant, matching the original part's compliance profile.

For Position Upgrade (72-Position Requirement)

The Harwin M20-9743646 is an active product within the same M20 series, providing four additional contact positions while maintaining identical pitch, mounting configuration, and electrical ratings. This part is suitable for applications where expanded I/O capacity is beneficial without redesigning the connector interface.

Compliance Considerations

All substitute parts maintain UL94 V-0 flammability certification and MSL 1 ratings. The Amphenol BERGSTIK® series carries RoHS compliance; the Sullins and Harwin M20-9743646 carry ROHS3 compliance. Selection should align with specific regulatory requirements for the end application.

Frequently Asked Questions (FAQ)

Q: Can the 72-position M20-9743646 be used as a direct replacement for the 68-position M20-9743446?

A: The M20-9743646 maintains identical pitch (2.54mm), mounting type (through-hole, right-angle), and electrical ratings (3A per contact). However, it provides 72 positions instead of 68. Direct substitution is possible only if the PCB layout accommodates the additional contact positions. The connector footprint will be larger.

Q: What are the key differences between Amphenol BERGSTIK® variants (77317-103-68LF, 77317-104-68LF, 77317-403-68LF, 77317-404-68LF, 77317-803-68LF, 77317-804-68LF)?

A: All variants maintain 68 positions at 2.54mm pitch and identical mounting configuration. Differences exist in contact post length (0.100" or 0.120"), contact finish (tin or gold with varying thickness), and contact material (phosphor bronze vs. brass). These variations affect mating force, contact resistance, and durability in corrosive environments. Selection depends on specific application requirements for contact engagement depth and environmental exposure.

Q: Is the Sullins PREC034DBAN-M71RC fully compatible with the M20-9743446?

A: The Sullins part matches the M20-9743446 in position count (68), pitch (2.54mm), mounting type (through-hole, right-angle), and electrical rating (3A). Both are ROHS3 compliant with MSL 1 ratings and UL94 V-0 flammability certification. The primary difference is insulation material (PBT vs. polyamide), which does not affect electrical or mechanical compatibility for standard applications.

Q: What is the significance of contact finish differences in the Amphenol BERGSTIK® series?

A: Contact finish affects contact resistance, corrosion resistance, and mating force. Tin-plated contacts (77317-403-68LF, 77317-404-68LF) provide cost-effective performance for standard environments. Gold-plated contacts (77317-103-68LF, 77317-104-68LF, 77317-803-68LF, 77317-804-68LF) offer superior corrosion resistance and lower contact resistance, beneficial for low-signal applications or high-reliability requirements. Gold thickness varies (30.0µin, 15.0µin), affecting durability and cost.

Q: Are there packaging differences between substitute parts?

A: Yes. Amphenol BERGSTIK® parts are supplied in bag packaging; Harwin M20-9743646 and Sullins PREC034DBAN-M71RC are supplied in bulk packaging. Packaging does not affect electrical or mechanical performance but may influence handling, storage, and procurement logistics.

Q: What is the operating temperature advantage of Amphenol BERGSTIK® parts?

A: Amphenol BERGSTIK® variants operate from -65°C to 130°C, compared to -40°C to 105°C for the original M20-9743446 and Sullins PREC034DBAN-M71RC. This extended range provides thermal margin for applications in extreme environments, automotive, or industrial settings with temperature cycling stress.

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