M20-9720945 Rectangular Connector Header Equivalent & Substitute Parts

Part Overview

The M20-9720945 is a vertical rectangular connector header manufactured by Harwin Inc., designed for through-hole mounting applications. This 18-position, 2-row connector operates at 0.100" (2.54mm) pitch and supports 3A per contact with an operating temperature range of -40°C to 105°C. The part is currently active in production and RoHS3 compliant. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and compatibility options for applications requiring identical or functionally equivalent connector specifications.

Key Parameters

Parameter	M20-9720945 Specification
Manufacturer	Harwin Inc.
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	18
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Contact Material	Brass
Contact Finish - Mating	Gold
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 is determined by strict alignment with the following critical parameters:

Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 18
Number of Rows: 2
Row Spacing - Mating: 0.100" (2.54mm)
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed meet these core electrical and mechanical parameters. Variations in contact material, contact finish thickness, insulation material, and operating temperature ranges are noted but do not preclude substitution when application requirements fall within the substitute part's specifications.

Parameter Comparison

Parameter	M20-9720945	0901310769	77313-127-18LF	77313-824-18LF	A1-18PA-2.54DSA(71)	HTSW-109-24-G-D	HTSW-109-24-L-D-LL	MTSW-109-08-SM-D-315	MTSW-109-22-S-D-285	ZW-09-07-T-D-250-090	ZW-09-15-G-D-300-230
Manufacturer	Harwin Inc.	Molex	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Hirose Electric Co Ltd	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Number of Positions	18	18	18	18	18	18	18	18	18	18	18
Number of Rows	2	2	2	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)	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)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
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	Solder	Solder	Solder	Kinked Pin, Solder	Solder	Solder	Solder	Solder
Contact Material	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Contact Finish - Mating	Gold	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold	Gold	Gold	Gold	Gold	Tin	Gold
Operating Temperature	-40°C ~ 105°C	Not Specified	-65°C ~ 130°C	-65°C ~ 130°C	-55°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	Not Specified	Not Specified
Current Rating	3A per Contact	Not Specified	3A per Contact	3A per Contact	3A	Varies by Wire Gauge	Varies by Wire Gauge	3A	3A	Not Specified	Not Specified
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	Not Specified	UL94 V-0
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts maintain compliance with UL94 V-0 flammability requirements and RoHS regulations. Selection among substitutes should be based on application-specific operating temperature requirements and contact material preferences.

For applications operating within the M20-9720945 temperature range of -40°C to 105°C, all substitute parts are suitable. The Amphenol ICC (FCI) BERGSTIK® series (77313-127-18LF and 77313-824-18LF) and Samtec HTSW series offer extended temperature ranges to -65°C or -55°C, providing margin for thermal stress conditions.

Contact material differences exist between brass (M20-9720945, 0901310769, A1-18PA-2.54DSA(71)) and phosphor bronze (Amphenol ICC and Samtec parts). Phosphor bronze offers superior spring characteristics and contact retention. Brass provides cost efficiency for standard applications.

Samtec Flex Stack series (MTSW-109-08-SM-D-315, MTSW-109-22-S-D-285) and ZW series (ZW-09-07-T-D-250-090, ZW-09-15-G-D-300-230) are spacer connectors with variable stack heights, suitable for applications requiring specific board-to-board spacing or stacking configurations.

Frequently Asked Questions (FAQ)

Q: Can I substitute the M20-9720945 with any of the listed parts directly?

A: Yes, all listed parts share the critical parameters: 18 positions, 2 rows, 0.100" (2.54mm) pitch and row spacing, male pin contact type, through-hole mounting, and solder termination. Physical footprint compatibility is maintained across all substitutes.

Q: What is the difference between the Samtec HTSW and MTSW series?

A: The HTSW series (HTSW-109-24-G-D, HTSW-109-24-L-D-LL) are standard headers with fixed geometry. The MTSW series (MTSW-109-08-SM-D-315, MTSW-109-22-S-D-285) are cuttable Flex Stack headers with variable contact lengths and stack heights, allowing customization for specific board spacing requirements.

Q: Are there temperature limitations I should consider?

A: The M20-9720945 operates from -40°C to 105°C. Amphenol ICC parts extend to -65°C to 130°C, and Samtec HTSW parts to -55°C to 125°C. If your application requires operation below -40°C or above 105°C, select a substitute with the appropriate extended range.

Q: What is the difference between gold and tin contact finishes?

A: Gold finishes (M20-9720945, most substitutes) provide superior corrosion resistance and lower contact resistance. Tin finishes (ZW-09-07-T-D-250-090) offer cost efficiency for standard indoor applications. Both meet UL94 V-0 requirements.

Q: Can I use the Samtec ZW spacer connectors as direct replacements?

A: ZW series parts are board stacking connectors with different overall pin lengths and stack heights. They are functionally equivalent for 18-position 2.54mm pitch applications but are designed for specific board-to-board spacing. Verify mechanical clearance and stack height compatibility before substitution.

Q: What does "Cuttable" mean in the connector type?

A: Cuttable connectors (M20-9720945, MTSW series) allow individual pins or rows to be separated after manufacturing, enabling custom configurations. Standard headers cannot be modified post-manufacture.

Q: Are all parts RoHS3 compliant?

A: Most parts are RoHS3 compliant. Amphenol ICC parts (77313-127-18LF, 77313-824-18LF) and Hirose A1-18PA-2.54DSA(71) are RoHS compliant but not specifically RoHS3. Verify compliance requirements for your application before selection.

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