M20-9742942 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The M20-9742942 is a right-angle rectangular connector header manufactured by Harwin Inc., designed for through-hole mounting with 58 positions at 0.100" (2.54mm) pitch. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The connector features male pins, unshrouded design, and board-to-board or cable connectivity with solder termination and push-pull fastening.

Key Parameters

Parameter	M20-9742942
Manufacturer	Harwin Inc.
Number of Positions	58
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Connector Type	Header, Cuttable
Contact Type	Male Pin
Mounting Type	Through Hole, Right Angle
Termination	Solder
Fastening Type	Push-Pull
Contact Length - Mating	0.228" (5.80mm)
Contact Length - Post	0.118" (3.00mm)
Insulation Height	0.200" (5.08mm)
Contact Shape	Square
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
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
Insulation Color	Black
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the M20-9742942 are qualified based on the following critical parameters that must align with the original design:

Core Compatibility Parameters:

Number of positions: 58
Number of rows: 2
Pitch - mating: 0.100" (2.54mm)
Row spacing - mating: 0.100" (2.54mm)
Connector type: Header with breakaway or cuttable capability
Contact type: Male pin
Mounting type: Through hole, right angle
Termination: Solder
Fastening type: Push-pull
Contact shape: Square
Insulation color: Black
Current rating: 3A per contact
Material flammability rating: UL94 V-0

Allowable Variations:

Contact material: Brass (original) to Phosphor Bronze (substitutes)
Insulation material: Polyamide (PA6T) to Thermoplastic or Polybutylene Terephthalate (PBT)
Contact finish - mating: Gold or Tin finishes acceptable
Contact length - post: Range 0.100" to 0.200" (2.54mm to 5.08mm)
Insulation height: Range 0.190" to 0.240" (4.83mm to 6.10mm)
Operating temperature: Extended range acceptable (-65°C to 130°C exceeds original -40°C to 105°C)

All substitute parts maintain the same electrical and mechanical interface requirements, ensuring direct functional equivalence in board-to-board applications.

Parameter Comparison

Parameter	M20-9742942	77317-103-58LF	77317-104-58LF	77317-403-58LF	77317-404-58LF	77317-803-58LF	77317-804-58LF	PBC29DBBN
Manufacturer	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Sullins Connector Solutions
Number of Positions	58	58	58	58	58	58	58	58
Number of Rows	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)
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)
Connector Type	Header, Cuttable	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway
Contact Type	Male Pin	Male Pin	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	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)	0.200" (5.08mm)
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)	0.240" (6.10mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold, GXT™	Gold, GXT™	Tin	Tin	Gold, GXT™	Gold, GXT™	Gold
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin	Tin	Tin	Tin
Contact Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
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	-65°C ~ 125°C
Current Rating	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A
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
Insulation Color	Black	Black	Black	Black	Black	Black	Black	Black
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
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)	Not Applicable

Engineering Selection Recommendations

All seven substitute parts are functionally equivalent to the M20-9742942 for board-to-board connector applications. Selection should be based on product availability, compliance requirements, and specific application constraints.

Amphenol ICC (FCI) BERGSTIK® Series (77317-103-58LF, 77317-104-58LF, 77317-403-58LF, 77317-404-58LF, 77317-803-58LF, 77317-804-58LF):

These six parts are active products with extended operating temperature range (-65°C to 130°C) and RoHS compliance. They differ in contact post length and mating contact finish:

77317-103-58LF and 77317-803-58LF: 0.100" (2.54mm) post length, gold mating finish
77317-104-58LF and 77317-804-58LF: 0.120" (3.05mm) post length, gold mating finish
77317-403-58LF and 77317-404-58LF: Tin mating finish with 0.100" and 0.120" post lengths respectively

The gold-finished variants (77317-103-58LF, 77317-104-58LF, 77317-803-58LF, 77317-804-58LF) provide superior corrosion resistance and contact reliability. The tin-finished variants (77317-403-58LF, 77317-404-58LF) offer cost optimization for non-corrosive environments.

Sullins Connector Solutions PBC29DBBN:

This part is an active product with ROHS3 compliance and extended operating temperature (-65°C to 125°C). It features a longer contact post (0.200" / 5.08mm) and higher insulation height (0.240" / 6.10mm), making it suitable for applications requiring deeper board penetration or increased insulation clearance. Moisture sensitivity is not applicable, indicating superior moisture handling characteristics.

All substitute parts maintain UL94 V-0 flammability rating and 3A per contact current capacity, ensuring compliance with the original design specifications.

Frequently Asked Questions (FAQ)

Q: Can I use 77317-403-58LF or 77317-404-58LF as direct replacements for the M20-9742942?

A: Yes. These tin-finished variants are electrically and mechanically equivalent. The mating contact finish difference (tin versus gold) does not affect compatibility in standard board-to-board applications. Tin finish is suitable for non-corrosive environments and provides cost advantages.

Q: What is the difference between the 77317-103-58LF and 77317-104-58LF?

A: Both are gold-finished BERGSTIK® headers with identical mating characteristics. The primary difference is contact post length: 77317-103-58LF has 0.100" (2.54mm) posts, while 77317-104-58LF has 0.120" (3.05mm) posts. Select based on PCB thickness and solder joint depth requirements.

Q: Why does the PBC29DBBN have a longer contact post (0.200") compared to other substitutes?

A: The PBC29DBBN is designed for applications requiring deeper board penetration or thicker PCB assemblies. The extended post length accommodates boards up to 0.200" thickness while maintaining adequate solder joint formation. This part is suitable for multi-layer PCB designs or applications with specific mechanical requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are RoHS compliant. The M20-9742942 is ROHS3 compliant, and all Amphenol ICC (FCI) and Sullins substitutes maintain RoHS compliance status, ensuring regulatory alignment for current manufacturing standards.

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

A: The M20-9742942 operates from -40°C to 105°C. All substitute parts extend this range to -65°C to 125°C (or 130°C for Amphenol variants), providing enhanced thermal performance for demanding applications. This extended range does not affect compatibility in standard temperature environments.

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

A: Yes, all substitute parts are mechanically and electrically interchangeable. However, for consistency in manufacturing and quality control, using a single part number across an assembly is recommended.

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

A: Both allow position reduction through mechanical separation. Cuttable headers (M20-9742942) are cut with tools, while breakaway headers (all substitutes) feature pre-scored sections for manual separation. Functionally, both achieve the same result of creating custom-length connectors from the 58-position base.

Q: Which substitute part should I select for maximum corrosion resistance?

A: The gold-finished variants (77317-103-58LF, 77317-104-58LF, 77317-803-58LF, 77317-804-58LF) provide superior corrosion resistance compared to tin-finished parts. Among these, 77317-803-58LF and 77317-804-58LF feature thinner gold plating (15.0µin / 0.38µm) suitable for standard applications, while 77317-103-58LF and 77317-104-58LF offer thicker gold plating (30.0µin / 0.76µm) for enhanced durability in harsh environments.

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