M20-9972045 Equivalent & Substitute Parts

Part Overview

The M20-9972045 is a vertical rectangular connector header manufactured by Harwin Inc., featuring 40 positions at 2.54mm pitch with through-hole solder termination. This connector is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 105°C and carries a current rating of 3A per contact with UL94 V-0 flammability compliance.

Key Parameters

Parameter	M20-9972045 Specification
Manufacturer	Harwin Inc.
Number of Positions	40
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
Contact Finish - Mating	Gold
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the M20-9972045 is determined by the following critical parameters that must align with the original specification:

Primary Matching Criteria:

Number of Positions: 40
Pitch - Mating: 0.100" (2.54mm)
Number of Rows: 2
Row Spacing - Mating: 0.100" (2.54mm)
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Insulation Height: 0.100" (2.54mm)
Contact Shape: Square
Material Flammability Rating: UL94 V-0
Current Rating: 3A per Contact

Secondary Compatibility Factors:

Operating Temperature Range (minimum -40°C, maximum 105°C or higher)
Contact Finish - Mating (Gold or equivalent conductive finish)
Contact Material (Brass or Phosphor Bronze)
Insulation Material (Polyamide or equivalent thermoplastic)
RoHS Compliance Status

All substitute parts listed below maintain these critical parameters, ensuring direct functional compatibility with applications originally designed for the M20-9972045.

Parameter Comparison

Parameter	M20-9972045	M20-9973646	77313-115-40LF	78548-140HLF	892-70-040-10-003101	EW-20-10-L-D-270	HTSW-120-42-F-D	HTSW-120-42-G-D	HTSW-120-42-L-D	HTSW-120-42-S-D	HTSW-120-42-T-D
Manufacturer	Harwin Inc.	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Preci-Dip	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Number of Positions	40	72	40	40	40	40	40	40	40	40	40
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)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2	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)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Connector Type	Header, Cuttable	Header, Cuttable	Header, Breakaway	Header	Header	Header Spacer	Header	Header	Header	Header	Header
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	Solder	Kinked Pin, 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
Contact Length - Mating	0.335" (8.51mm)	0.335" (8.51mm)	0.335" (8.51mm)	0.318" (8.08mm)	0.335" (8.51mm)	0.230" (5.842mm)	0.320" (8.13mm)	0.320" (8.13mm)	0.320" (8.13mm)	0.320" (8.13mm)	0.320" (8.13mm)
Contact Length - Post	0.116" (2.95mm)	0.116" (2.95mm)	0.100" (2.54mm)	0.120" (3.05mm)	0.118" (3.00mm)	—	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Overall Contact Length	0.551" (14.00mm)	0.551" (14.00mm)	0.535" (14.69mm)	0.538" (13.67mm)	0.553" (14.04mm)	0.830" (21.082mm)	0.470" (11.94mm)	0.470" (11.94mm)	0.470" (11.94mm)	0.470" (11.94mm)	0.470" (11.94mm)
Insulation Height	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)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Shape	Square	Square	Square	Square	Square	—	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Tin	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold	Gold	Gold	Gold	Gold	Gold	Tin
Contact Material	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Brass	—	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T	Thermoplastic	Polycyclohexylenedimethylene Terephthalate (PCT)	Polyamide (PA), Nylon, Glass Filled	—	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-65°C ~ 130°C	—	-55°C ~ 125°C	—	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 105°C
Current Rating	3A per Contact	3A per Contact	3A per Contact	—	3A	—	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge
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	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: Amphenol ICC (FCI) 77313-115-40LF

The 77313-115-40LF from the BERGSTIK® series represents the most direct functional equivalent to the M20-9972045. This part maintains all critical electrical and mechanical parameters including 40 positions, 2.54mm pitch, 2-row configuration, through-hole solder termination, and UL94 V-0 flammability rating. The part is currently in active production status with RoHS compliance certification. Operating temperature range extends to -65°C to 130°C, exceeding the original specification. Gold contact finish on mating surfaces ensures compatibility with existing PCB designs. Phosphor bronze contact material provides superior durability compared to brass.

Secondary Recommendation: Samtec Inc. HTSW-120-42 Series

The HTSW-120-42 series (variants F-D, G-D, L-D, S-D, T-D) offers active production alternatives with identical position count and pitch specifications. These parts feature Liquid Crystal Polymer insulation material, providing enhanced thermal and mechanical stability. Operating temperature range of -55°C to 125°C meets or exceeds the original specification. Multiple contact finish options (Gold or Tin) accommodate various application requirements. All variants carry ROHS3 compliance and UL94 V-0 flammability certification. The reduced overall contact length (0.470" vs. 0.551") may require PCB layout verification for applications with height constraints.

Alternative Recommendation: Preci-Dip 892-70-040-10-003101

The 892-70-040-10-003101 maintains identical position count, pitch, and row spacing with gold contact finish on both mating and post surfaces. Operating temperature range of -55°C to 125°C and 3A current rating per contact align with original specifications. ROHS3 compliance and UL94 V-0 flammability rating are confirmed. Glass-filled polyamide insulation provides enhanced mechanical strength. This part is suitable for applications requiring robust connector performance in industrial environments.

Note on M20-9973646:

The M20-9973646 from Harwin Inc. shares identical electrical and mechanical parameters with the M20-9972045 but features 72 positions instead of 40. This part is not a direct substitute but may be considered for applications requiring higher position density with the same pitch and row spacing specifications.

Note on EW-20-10-L-D-270:

The EW-20-10-L-D-270 from Samtec Inc. is a header spacer connector with extended overall pin length (0.830") designed for stacked connector applications. While maintaining 40 positions and 2.54mm pitch, the significantly different contact geometry and stack height (0.270") limit its applicability to standard M20-9972045 replacement scenarios. This part is suitable only for applications specifically requiring spacer connector functionality.

Frequently Asked Questions (FAQ)

Q: Can the M20-9973646 be used as a direct replacement for the M20-9972045?

A: No. While both parts are manufactured by Harwin Inc. and share identical electrical and mechanical parameters, the M20-9973646 features 72 positions compared to the 40 positions of the M20-9972045. Direct substitution would result in incompatibility with existing PCB footprints and mating connectors. The M20-9973646 is suitable only for applications requiring higher position density at the same 2.54mm pitch.

Q: What are the key differences between the Amphenol ICC 77313-115-40LF and the Samtec HTSW-120-42 series?

A: Both parts maintain the critical 40-position, 2.54mm pitch specification required for M20-9972045 compatibility. Primary differences include contact material (Phosphor Bronze in both cases), insulation material (Thermoplastic vs. Liquid Crystal Polymer), and overall contact length (0.535" vs. 0.470"). The Amphenol part features a wider operating temperature range (-65°C to 130°C). The Samtec series offers multiple contact finish options. PCB layout verification is recommended when transitioning between these parts due to contact length variations.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry either RoHS or ROHS3 compliance certification. The M20-9972045 original part is ROHS3 compliant. All active production alternatives maintain equivalent or superior compliance status, ensuring regulatory alignment for new designs and production transitions.

Q: What is the significance of contact finish variations (Gold vs. Tin)?

A: Contact finish affects electrical conductivity, corrosion resistance, and solderability. Gold finishes provide superior corrosion resistance and are preferred for high-reliability applications. Tin finishes offer cost advantages and adequate performance for standard industrial applications. The original M20-9972045 specifies gold mating surface finish. Substitute parts with gold finishes (77313-115-40LF, HTSW-120-42-F-D, HTSW-120-42-G-D, HTSW-120-42-L-D, HTSW-120-42-S-D, 892-70-040-10-003101) provide direct compatibility. The HTSW-120-42-T-D variant with tin finish is suitable for cost-sensitive applications where corrosion resistance requirements are less stringent.

Q: How do operating temperature ranges affect part selection?

A: The M20-9972045 operates across -40°C to 105°C. All substitute parts meet or exceed this specification. The Amphenol 77313-115-40LF extends to -65°C to 130°C, providing additional thermal margin. The Samtec HTSW-120-42 series operates to -55°C to 125°C (except HTSW-120-42-T-D which is limited to -55°C to 105°C). The Preci-Dip 892-70-040-10-003101 operates to -55°C to 125°C. For applications operating within the original -40°C to 105°C range, all substitutes are thermally compatible. Applications requiring extended temperature operation should select parts with wider operating ranges.

Q: What is the impact of contact length variations on PCB design?

A: The M20-9972045 specifies overall contact length of 0.551" (14.00mm). Substitute parts vary: Amphenol 77313-115-40LF (0.535"), Preci-Dip 892-70-040-10-003101 (0.553"), and Samtec HTSW-120-42 series (0.470"). Shorter contact lengths may affect PCB clearance and mating connector engagement depth. PCB layout verification is required when transitioning to parts with significantly different contact lengths, particularly the Samtec series with 0.470" overall length. Consult connector mating specifications to ensure adequate engagement and mechanical stability.

Q: Is the EW-20-10-L-D-270 suitable for replacing the M20-9972045?

A: No. The EW-20-10-L-D-270 is a header spacer connector designed for stacked connector applications with extended overall pin length (0.830") and stack height (0.270"). While maintaining 40 positions and 2.54mm pitch, the fundamentally different connector geometry and intended application make it unsuitable as a direct M20-9972045 replacement. This part is applicable only to applications specifically requiring spacer connector functionality.

Q: What certifications should be verified when transitioning to substitute parts?

A: All substitute parts carry UL94 V-0 flammability certification, matching the original M20-9972045. RoHS or ROHS3 compliance is confirmed for all parts. The Amphenol 77313-115-40LF carries REACH Affected status, while other parts are REACH Unaffected or have unspecified REACH status. All parts are classified as EAR99 for export control purposes. Verify specific regulatory requirements for your application region and end-use industry before final part selection.

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