M20-9763546 Equivalent & Substitute Parts

Part Overview

The Harwin M20-9763546 is a rectangular connector header with 70 positions at 2.54mm pitch, designed for through-hole board-to-board or cable applications. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design work and production requirements. The M20 series features a cuttable header design with unshrouded construction, tin-plated brass contacts, and solder termination suitable for applications requiring 3A per contact current capacity.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9763546
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Number of Positions	70
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Connector Type	Header, Cuttable
Contact Type	Male Pin
Mounting Type	Through Hole
Termination	Solder
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 M20-9763546 is determined by the following critical parameters that must remain constant:

Position Count: 70 positions (exact match required)
Pitch: 0.100" (2.54mm) mating pitch
Row Configuration: 2 rows with 0.100" (2.54mm) row spacing
Contact Type: Male pin headers
Mounting: Through-hole solder termination
Fastening: Push-pull mechanism
Insulation Material & Color: Black insulation
Flammability: UL94 V-0 rated
Current Capacity: 3A per contact minimum

Substitute parts are grouped into two categories based on position count alignment:

Category A - Exact 70-Position Match: Parts maintaining identical 70-position configuration with equivalent electrical and mechanical characteristics.

Category B - Position Variance: The M20-9763646 (72 positions) represents a higher-capacity alternative where the additional 2 positions may accommodate expanded connector requirements while maintaining all other critical parameters.

Parameter Comparison

Parameter	M20-9763546 (Main)	M20-9763646	0702871082 (Molex)	2370-6221-TG (3M)	77313-122-70LF (FCI)	77313-124-70LF (FCI)	77313-127-70LF (FCI)	77313-422-70LF (FCI)	77313-424-70LF (FCI)	77313-427-70LF (FCI)	77313-822-70LF (FCI)
Positions	70	72	70	70	70	70	70	70	70	70	70
Pitch (mm)	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54
Rows	2	2	2	2	2	2	2	2	2	2	2
Row Spacing (mm)	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54	2.54
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Kinked Pin, 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	Push-Pull	Push-Pull
Contact Material	Brass	Brass	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Contact Finish - Mating	Tin	Tin	Tin	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Tin	Tin	Tin	Gold or Gold, GXT™
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T	Liquid Crystal Polymer (LCP), Glass Filled	Thermoplastic, Glass Filled	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic
Insulation Color	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black
Current Rating	3A per Contact	3A per Contact	Not specified	3A	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	Not specified	-55°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 ~ 130°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	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Exact 70-Position Match, Active Status)

The Amphenol ICC (FCI) BERGSTIK series parts (77313-122-70LF, 77313-124-70LF, 77313-127-70LF, 77313-422-70LF, 77313-424-70LF, 77313-427-70LF, 77313-822-70LF) are direct functional equivalents with active product status and RoHS compliance. These parts maintain the critical 70-position, 2.54mm pitch configuration with identical row spacing and push-pull fastening. The BERGSTIK series offers extended operating temperature range (-65°C ~ 130°C) compared to the original part, providing enhanced thermal performance. Contact finish variations (tin or gold) and contact length options accommodate different application requirements while preserving electrical and mechanical compatibility.

The Molex 0702871082 (C-Grid 70287 series) provides an alternative 70-position header with active status and ROHS3 compliance. This part features kinked pin termination in addition to solder termination, offering enhanced mechanical retention during assembly.

Secondary Substitute (72-Position Variant)

The Harwin M20-9763646 represents an active-status alternative with 72 positions, maintaining all other critical parameters including pitch, row spacing, and electrical ratings. This part is suitable for applications where additional connector capacity is acceptable or beneficial.

Non-Recommended Substitute

The 3M 2370-6221-TG, while maintaining 70-position configuration and 2.54mm pitch, carries RoHS non-compliance status and REACH-affected designation, making it unsuitable for applications requiring regulatory compliance with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can I use a 72-position header (M20-9763646) as a direct replacement for the 70-position M20-9763546?

A: The M20-9763646 maintains identical pitch (2.54mm), row spacing (2.54mm), and electrical characteristics (3A per contact). The additional 2 positions do not affect compatibility with existing 70-position mating connectors. However, the physical footprint will be slightly larger. Verify PCB layout accommodation before substitution.

Q: What is the difference between tin-plated and gold-plated contact finishes in the BERGSTIK series?

A: Both finishes meet the same electrical and mechanical requirements for this application. Tin-plated contacts (77313-422-70LF, 77313-424-70LF, 77313-427-70LF) provide cost efficiency. Gold-plated contacts (77313-122-70LF, 77313-124-70LF, 77313-127-70LF, 77313-822-70LF) offer enhanced corrosion resistance and are preferred for high-reliability applications or environments with potential corrosive exposure.

Q: How do contact length variations affect substitution compatibility?

A: The BERGSTIK series offers three contact length options (0.260", 0.266", 0.305" mating length). These variations determine mating depth and stacking height. Verify that the selected substitute accommodates the mating connector's contact length specifications and any stacking height constraints in your application.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes except the 3M 2370-6221-TG are RoHS compliant. The Amphenol ICC BERGSTIK series and Harwin M20-9763646 meet ROHS3 compliance. The Molex 0702871082 meets ROHS3 compliance. Verify compliance requirements for your specific application before final part selection.

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

A: Both the original M20-9763546 (cuttable) and BERGSTIK substitutes (breakaway) allow individual position separation. The functional outcome is equivalent for applications requiring partial connector configurations. The specific mechanism differs between manufacturers but achieves the same result.

Q: Can I substitute parts with different insulation materials?

A: The original part uses Polyamide (PA6T) Nylon 6T insulation. Substitute parts employ Thermoplastic or Liquid Crystal Polymer (LCP) materials. All materials meet UL94 V-0 flammability requirements and maintain equivalent electrical insulation properties. Material substitution is acceptable for standard applications; verify material compatibility for specialized environmental conditions.

Q: What inventory considerations should I account for when selecting a substitute?

A: Current inventory levels are provided for reference. The Amphenol ICC BERGSTIK series maintains robust stock levels (710-1047 units), ensuring supply continuity. The Molex 0702871082 and 3M 2370-6221-TG also maintain adequate inventory. Harwin M20-9763646 (1351 units) offers the highest availability among active alternatives.

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