Equivalent & Substitute Parts for M20-9743542

Part Overview

The Harwin M20-9743542 is a rectangular connector header featuring a right-angle, through-hole mount configuration with 70 positions at 0.100" (2.54mm) pitch. This connector is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The M20 series header is designed for board-to-board or cable applications with solder termination and push-pull fastening. Identifying compatible alternatives ensures design continuity and supply chain flexibility.

Key Parameters

Parameter	M20-9743542 Specification
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	70
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Termination	Solder
Fastening Type	Push-Pull
Contact Material	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T
Operating Temperature	-40°C ~ 105°C
Current Rating	3A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9743542 is determined by the following critical parameters:

Connector pitch: 0.100" (2.54mm) mating pitch and 0.100" row spacing
Position count: 70 positions in 2-row configuration
Mounting: Through-hole, right-angle orientation
Contact type: Male pin with solder termination
Fastening: Push-pull mechanism
Current capacity: 3A per contact minimum
Flammability: UL94 V-0 rating
Environmental compliance: RoHS and MSL requirements

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in contact material (phosphor bronze vs. brass), contact finish (gold vs. tin), insulation material (thermoplastic vs. polyamide), and operating temperature range do not preclude functional substitution when the above criteria are met.

Parameter Comparison

Parameter	M20-9743542	77317-103-70LF	77317-104-70LF	77317-403-70LF	77317-404-70LF	77317-803-70LF	77317-804-70LF	PRPC035DBAN-M71RC
Manufacturer	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Sullins Connector Solutions
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
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)
Number of Positions	70	70	70	70	70	70	70	70
Number of Rows	2	2	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)	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
Termination	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
Contact Length - Mating	0.228" (5.80mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)
Contact Length - Post	0.118" (3.00mm)	0.100" (2.54mm)	0.120" (3.05mm)	0.100" (2.54mm)	0.120" (3.05mm)	0.100" (2.54mm)	0.120" (3.05mm)	0.120" (3.05mm)
Insulation Height	0.200" (5.08mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.197" (5.00mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square
Contact Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Polybutylene Terephthalate (PBT)
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
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
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
RoHS Status	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing support, addressing the obsolescence status of the M20-9743542. Selection among substitutes should be based on the following criteria:

Amphenol ICC (FCI) BERGSTIK® Series (77317-103-70LF, 77317-104-70LF, 77317-403-70LF, 77317-404-70LF, 77317-803-70LF, 77317-804-70LF): These 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. All variants are RoHS compliant and carry REACH compliance status. Contact finish options include gold (GXT™) and tin, with variations in finish thickness. Contact post length varies between 0.100" (2.54mm) and 0.120" (3.05mm), accommodating different PCB thickness requirements.

Sullins Connector Solutions PRPC035DBAN-M71RC: This part maintains the original operating temperature range (-40°C to 105°C) and uses brass contact material identical to the M20-9743542. It is ROHS3 compliant and REACH unaffected. The insulation material is PBT rather than polyamide, and contact post length is 0.120" (3.05mm). This option provides the closest thermal and material profile to the original part.

All substitutes maintain the critical electrical parameters: 0.100" pitch, 70 positions in 2-row configuration, 3A per contact current rating, and UL94 V-0 flammability rating.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly for the M20-9743542?

A: Yes. All listed parts meet the core substitution criteria: 0.100" (2.54mm) pitch, 70 positions, 2-row configuration, through-hole right-angle mounting, solder termination, push-pull fastening, 3A per contact current rating, and UL94 V-0 flammability. Functional compatibility is established across all substitutes.

Q: What is the difference between the Amphenol ICC variants?

A: The Amphenol ICC BERGSTIK® series variants differ in contact finish and contact post length. Parts ending in -03 and -03 use gold finish with 0.100" post length; -04 and -04 use gold finish with 0.120" post length; -403 and -404 use tin finish with 0.100" and 0.120" post lengths respectively; -803 and -804 use gold (GXT™) with reduced thickness and 0.100" and 0.120" post lengths respectively. Contact post length selection depends on PCB thickness and solder joint requirements.

Q: Does operating temperature range affect substitution?

A: The Amphenol ICC variants support -65°C to 130°C, exceeding the original -40°C to 105°C specification. The Sullins part matches the original temperature range. Both are acceptable substitutes; the extended range of Amphenol ICC parts provides additional thermal margin for applications requiring it.

Q: Are there compliance differences between substitutes?

A: All substitutes are RoHS compliant. Amphenol ICC parts carry REACH compliance status (affected or unaffected depending on variant); the Sullins part is REACH unaffected. All maintain MSL 1 (Unlimited) moisture sensitivity rating. Verify REACH status requirements for your specific application and region.

Q: What is the significance of contact material differences?

A: The M20-9743542 uses brass contacts; the Sullins PRPC035DBAN-M71RC also uses brass. Amphenol ICC variants use phosphor bronze. Both materials are suitable for 3A per contact applications. Phosphor bronze offers enhanced spring characteristics and durability in high-cycle mating applications.

Q: How do I select between contact post lengths?

A: Contact post length (0.100" vs. 0.120") affects solder joint formation and PCB hole engagement. Select 0.100" for standard PCB thickness (0.062"); select 0.120" for thicker PCBs or when additional solder joint volume is required. Consult your PCB design specifications and soldering process parameters.

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

A: All substitutes are mechanically and electrically compatible. However, for consistency in manufacturing and quality control, use a single part number across identical connector positions in your design.

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