M20-9983545 Equivalent & Substitute Parts

Part Overview

The M20-9983545 is a vertical rectangular connector header manufactured by Harwin Inc., featuring 70 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 ongoing design support and procurement. The part operates across a temperature range of -40°C to 105°C and carries a 3A current rating per contact with UL94 V-0 flammability compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9983545
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Description	CONN HEADER VERT 70POS 2.54MM
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	70
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
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 M20-9983545 is determined by the following critical parameters: connector pitch (0.100" / 2.54mm), number of positions (70), row configuration (2 rows), contact type (male pin), mounting method (through-hole solder), and electrical performance (3A per contact). Substitute parts must maintain these core specifications to ensure mechanical and electrical compatibility with existing PCB layouts and mating connectors.

The substitute parts are grouped into two categories:

Category 1: Direct Position Equivalents (70 positions) Parts maintaining the exact 70-position configuration with identical pitch and row spacing. These include Molex C-Grid 70280 series (0010897702), Molex C-Grid 70287 series (0702871082), 3M 2300 series (2370-6221-TG), and Amphenol ICC BERGSTIK® series variants (77313-122-70LF, 77313-124-70LF, 77313-127-70LF, 77313-422-70LF, 77313-424-70LF, 77313-427-70LF).

Category 2: Position Variant (72 positions) The Harwin M20-9983645 offers a 72-position configuration within the same M20 series, providing an alternative for applications requiring additional contact positions while maintaining identical pitch and row spacing.

Parameter Comparison

Parameter	M20-9983545	M20-9983645	0010897702	0702871082	2370-6221-TG	77313-122-70LF	77313-124-70LF	77313-127-70LF	77313-422-70LF	77313-424-70LF	77313-427-70LF
Manufacturer	Harwin Inc.	Harwin Inc.	Molex	Molex	3M	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Number of Positions	70	72	70	70	70	70	70	70	70	70	70
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	Kinked Pin, Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Finish - Mating	Gold	Gold	Gold	Tin	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™	Tin	Tin	Tin
Contact Material	Brass	Brass	Copper Alloy	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T	Liquid Crystal Polymer (LCP), Glass Filled	Liquid Crystal Polymer (LCP), Glass Filled	Thermoplastic, Glass Filled	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	Not specified	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
Current Rating	3A per Contact	3A per Contact	Not specified	Not specified	3A	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact
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	ROHS3 Compliant	RoHS non-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 Recommendation: M20-9983645 The Harwin M20-9983645 is the manufacturer-recommended successor within the same M20 series. It maintains identical electrical and mechanical specifications with the exception of 72 positions versus 70, operates with active product status, and carries ROHS3 compliance. This part is optimal for designs where the additional two contact positions do not create layout constraints.

Direct 70-Position Equivalents with Gold Finish: For applications requiring exact 70-position configuration with gold mating contact finish, the Amphenol ICC BERGSTIK® series parts (77313-122-70LF, 77313-124-70LF, 77313-127-70LF) provide active alternatives. These parts feature extended operating temperature range (-65°C to 130°C), RoHS compliance, and 3A per contact current rating. Variations exist in contact length and post dimensions; selection depends on specific PCB stack-up requirements.

Direct 70-Position Equivalents with Tin Finish: The Amphenol ICC BERGSTIK® series tin-finish variants (77313-422-70LF, 77313-424-70LF, 77313-427-70LF) offer identical position and pitch specifications with tin mating contact finish. These parts maintain RoHS compliance and extended temperature range, suitable for applications where tin finish is acceptable.

Alternative Manufacturers: Molex C-Grid 70280 series (0010897702) and C-Grid 70287 series (0702871082) provide 70-position equivalents with active product status and ROHS3 compliance. The 3M 2300 series (2370-6221-TG) offers 70-position configuration with gold finish and 3A rating; however, this part carries RoHS non-compliance status and REACH-affected designation, limiting suitability for regulated applications.

Compliance Considerations: All recommended substitutes except 2370-6221-TG maintain ROHS3 compliance. For applications subject to RoHS directives, exclude the 3M part. Amphenol ICC BERGSTIK® series parts carry REACH-affected status; verify compatibility with end-use regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can M20-9983645 (72 positions) directly replace M20-9983545 (70 positions)? A: M20-9983645 maintains identical pitch, row spacing, contact type, and electrical ratings. The two additional positions do not affect compatibility with existing 70-position mating connectors, as the extra positions extend the connector length. Verify PCB layout accommodates the increased overall length before substitution.

Q: What is the difference between gold and tin contact finishes in these headers? A: Contact finish affects corrosion resistance and mating force characteristics. Gold finish (M20-9983545, M20-9983645, Molex 0010897702, Amphenol 77313-122-70LF, 77313-124-70LF, 77313-127-70LF, 3M 2370-6221-TG) provides superior corrosion resistance and lower contact resistance. Tin finish (Molex 0702871082, Amphenol 77313-422-70LF, 77313-424-70LF, 77313-427-70LF) is cost-effective and suitable for non-corrosive environments. Both finishes meet UL94 V-0 flammability requirements.

Q: Are there mechanical differences between Amphenol BERGSTIK® variants? A: Yes. The 77313-122-70LF and 77313-422-70LF feature contact length - mating of 0.305" (7.75mm). The 77313-124-70LF and 77313-424-70LF feature 0.266" (6.75mm). The 77313-127-70LF and 77313-427-70LF feature 0.260" (6.60mm). These variations affect mating depth and overall connector height. Select based on PCB stack-up and mating connector specifications.

Q: What is the operating temperature difference between M20-9983545 and Amphenol BERGSTIK® parts? A: M20-9983545 operates -40°C to 105°C. Amphenol BERGSTIK® series operates -65°C to 130°C, providing extended temperature range. This difference is significant for applications in extreme thermal environments. Molex parts do not specify operating temperature.

Q: Are all substitute parts RoHS compliant? A: No. The 3M 2370-6221-TG is RoHS non-compliant. All other substitutes (

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