Equivalent & Substitute Parts for M20-9952845

Part Overview

The Harwin M20-9952845 is a rectangular connector header, right-angle configuration, with 56 positions at 2.54mm pitch. This through-hole, solder-terminated component is designed for board-to-board or cable applications. The M20 series is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives from major manufacturers provide compatible electrical and mechanical interfaces while maintaining current product support and availability.

Key Parameters

Parameter	M20-9952845
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	56
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9952845 is determined by the following critical parameters:

Primary Matching Criteria:

Connector type: Header configuration
Contact type: Male pin
Pitch: 0.100" (2.54mm) mating pitch
Number of positions: 56 total
Number of rows: 2
Row spacing: 0.100" (2.54mm)
Mounting: Through hole, right angle
Termination: Solder
Fastening: Push-Pull
Insulation color: Black
Material flammability: UL94 V-0

Secondary Compatibility Factors:

Contact finish (mating surface): Gold or tin acceptable
Contact material: Brass, phosphor bronze, or copper alloy
Insulation material: Polyamide, thermoplastic, or polybutylene terephthalate
Operating temperature range: Must encompass or exceed -40°C to 105°C
Current rating: 2A minimum per contact
RoHS compliance: ROHS3 or RoHS Compliant

All four substitute parts meet these criteria and are classified as active products with current manufacturer support.

Parameter Comparison

Parameter	M20-9952845 (Harwin)	77317-112-56LF (Amphenol ICC)	77317-412-56LF (Amphenol ICC)	77317-812-56LF (Amphenol ICC)	961256-5804-AR (3M)	TSW-128-08-L-D-RA (Samtec)
Connector Type	Header, Cuttable	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
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)
Number of Positions	56	56	56	56	56	56
Number of Rows	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)
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
Termination	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.240" (6.10mm)	0.268" (6.80mm)	0.268" (6.80mm)	0.268" (6.80mm)	0.272" (6.90mm)	0.230" (5.84mm)
Contact Length - Post	0.118" (3.00mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.130" (3.30mm)	0.090" (2.29mm)
Insulation Height	0.200" (5.08mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.190" (4.83mm)	0.197" (5.00mm)	0.219" (5.56mm)
Contact Shape	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold, GXT™	Tin	Gold, GXT™	Gold	Gold
Contact Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Copper Alloy	Phosphor Bronze
Insulation Material	Polyamide (PA6T), Nylon 6T	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	-25°C ~ 105°C	-55°C ~ 125°C
Current Rating	3A per Contact	3A per Contact	3A per Contact	3A per Contact	2A per Contact	Not specified
Material Flammability Rating	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
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Amphenol ICC BERGSTIK® Series (77317-112-56LF, 77317-412-56LF, 77317-812-56LF)

The three Amphenol ICC alternatives from the BERGSTIK® series provide the most direct functional equivalence to the M20-9952845. All three maintain identical pitch, position count, row configuration, and mounting specifications. The BERGSTIK® series offers extended operating temperature range (-65°C to 130°C) compared to the original part, providing enhanced thermal margin. All three variants are RoHS Compliant and carry active product status with established supply chains.

The primary difference among the three Amphenol ICC options is contact finish specification: 77317-112-56LF and 77317-812-56LF feature gold mating surfaces with varying thickness (30.0µin and 15.0µin respectively), while 77317-412-56LF specifies tin mating finish. Selection between these three should be based on existing design requirements for contact finish and corrosion resistance characteristics.

3M 961256-5804-AR

The 3M 961 series header provides mechanical and electrical compatibility with identical pitch, position count, and row spacing. This option maintains the same push-pull fastening and solder termination. The 961256-5804-AR operates within the original temperature range (-25°C to 105°C) and carries RoHS Compliant status. Current rating is specified at 2A per contact, which is lower than the original 3A specification. This part is suitable for applications where the 2A current rating is acceptable.

Samtec TSW-128-08-L-D-RA

The Samtec TSW series header meets all critical mechanical and electrical parameters including pitch, position count, row configuration, and mounting type. The TSW-128-08-L-D-RA operates across an extended temperature range (-55°C to 125°C) and is ROHS3 Compliant, matching the original part's compliance status. Contact length specifications differ from the original, with shorter mating contact length (0.230" versus 0.240") and post length (0.090" versus 0.118"). This part is suitable for applications where these dimensional variations are accommodated by the mating connector design.

Recommendation Priority:

For direct replacement with minimal design modification, the Amphenol ICC BERGSTIK® series (77317-112-56LF or 77317-812-56LF with gold finish) is the primary choice. For applications requiring extended temperature performance, all Amphenol ICC variants and the Samtec option provide superior thermal range. For cost-optimized solutions where 2A current rating is sufficient, the 3M 961256-5804-AR is a viable alternative.

Frequently Asked Questions (FAQ)

Q: Can the M20-9952845 be directly replaced with any of these substitute parts?

A: All four substitute parts are mechanically and electrically compatible with the M20-9952845 based on matching pitch (2.54mm), position count (56), row configuration (2 rows), mounting type (through-hole right-angle), and termination method (solder). However, minor dimensional variations in contact length and insulation height exist. Verify that the mating connector accommodates these variations before implementation.

Q: What is the primary reason for substitution?

A: The M20-9952845 is classified as obsolete. The substitute parts are all active products with current manufacturer support, established supply chains, and ongoing availability. This ensures long-term sourcing reliability for production and maintenance applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. The M20-9952845 is ROHS3 Compliant. The Amphenol ICC BERGSTIK® series and 3M 961256-5804-AR are RoHS Compliant. The Samtec TSW-128-08-L-D-RA is ROHS3 Compliant. All options meet current regulatory requirements.

Q: What are the key differences in contact material between options?

A: The original M20-9952845 uses brass contacts. The Amphenol ICC BERGSTIK® series, Samtec TSW, and 3M 961 all use phosphor bronze or copper alloy contacts. These materials provide equivalent electrical conductivity and contact reliability for the specified current ratings.

Q: Does operating temperature range affect substitution eligibility?

A: The original part operates from -40°C to 105°C. The Amphenol ICC BERGSTIK® series extends this to -65°C to 130°C, the Samtec TSW to -55°C to 125°C, and the 3M 961 to -25°C to 105°C. All options meet or exceed the original temperature specification. Selection should be based on actual application requirements.

Q: What is the significance of contact finish differences?

A: The M20-9952845 specifies gold mating finish. The Amphenol ICC 77317-112-56LF and 77317-812-56LF maintain gold finish with different thickness specifications. The 77317-412-56LF uses tin finish. The 3M and Samtec options use gold finish. Contact finish affects corrosion resistance and long-term contact reliability. Gold finish is preferred for applications requiring superior corrosion resistance.

Q: Are there current rating differences that affect substitution?

A: The M20-9952845 is rated at 3A per contact. The Amphenol ICC BERGSTIK® series and Samtec TSW maintain 3A rating. The 3M 961256-5804-AR is rated at 2A per contact. For applications requiring 3A per contact, the 3M option is not suitable. For applications with 2A or lower current requirements, the 3M option is acceptable.

Q: What packaging considerations apply to these substitutes?

A: The M20-9952845 packaging is not specified. Amphenol ICC BERGSTIK® series parts are supplied in bags. The 3M 961256-5804-AR packaging is not specified. The Samtec TSW-128-08-L-D-RA is supplied in bulk. Verify packaging requirements for your procurement and assembly processes.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, with verification of mating connector compatibility. The critical parameters—pitch, position count, row spacing, mounting type, and termination—are identical across all options. Minor variations in contact length and insulation height require confirmation that the mating connector accommodates these dimensions. Electrical performance is equivalent across all options for applications within the specified current and temperature ranges.

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