M20-9953545 Equivalent & Substitute Parts

Part Overview

The Harwin M20-9953545 is a rectangular connector header, right-angle mounted, 70-position configuration with 0.100" (2.54mm) pitch for through-hole PCB assembly. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain electrical and mechanical compatibility across the same connector interface standard while meeting current manufacturing and compliance requirements.

Key Parameters

Parameter	M20-9953545
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
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, Right Angle
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Primary Matching Criteria:

Number of Positions: 70 (exact match required)
Pitch - Mating: 0.100" (2.54mm) (exact match required)
Row Spacing - Mating: 0.100" (2.54mm) (exact match required)
Mounting Type: Through Hole, Right Angle (exact match required)
Contact Type: Male Pin (exact match required)
Termination: Solder (exact match required)

Secondary Compatibility Parameters:

Number of Rows: 2 (exact match required)
Style: Board to Board or Cable
Shrouding: Unshrouded
Fastening Type: Push-Pull
Material Flammability Rating: UL94 V-0

Acceptable Variations:

Contact Material: Brass or Phosphor Bronze (both suitable for 0.100" pitch applications)
Contact Finish - Mating: Gold or Tin (both provide adequate conductivity and corrosion resistance)
Insulation Material: Polyamide (PA6T) or Thermoplastic (both meet UL94 V-0 requirement)
Operating Temperature Range: May exceed original specification (-40°C ~ 105°C)
Current Rating: May equal or exceed 3A per Contact

Non-Substitutable Deviations:

Position count deviation (M20-9953645 with 72 positions is not a direct substitute)
Single-row configurations
Different pitch spacing
Shrouded designs

Parameter Comparison

Parameter	M20-9953545	M20-9953645	77317-112-70LF	77317-412-70LF	77317-812-70LF	892-70-070-20-001101	961270-5804-AR
Manufacturer	Harwin Inc.	Harwin Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Preci-Dip	3M
Number of Positions	70	72	70	70	70	70	70
Number of Rows	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)
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)
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	Through Hole, Right Angle
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Material	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Brass	Copper Alloy
Contact Finish - Mating	Gold	Gold	Gold, GXT™	Tin	Gold, GXT™	Gold	Gold
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T	Thermoplastic	Thermoplastic	Thermoplastic	Polyamide (PA), Nylon, Glass Filled	Thermoplastic
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-65°C ~ 130°C	-65°C ~ 130°C	-65°C ~ 130°C	-55°C ~ 125°C	-25°C ~ 105°C
Current Rating	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A per Contact	3A	2A
Material Flammability Rating	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	RoHS Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (70-Position, Exact Match):

The following parts meet all primary matching criteria and are suitable for direct substitution in applications currently using M20-9953545:

77317-112-70LF (Amphenol ICC): Active product status, extended operating temperature range (-65°C ~ 130°C), RoHS compliant. Contact finish includes GXT™ gold plating with specified thickness (30.0µin). Phosphor bronze contact material provides equivalent electrical performance.
77317-412-70LF (Amphenol ICC): Active product status, extended operating temperature range (-65°C ~ 130°C), RoHS compliant. Tin contact finish on mating surface with specified thickness (78.7µin). Suitable for applications where tin finish is acceptable.
77317-812-70LF (Amphenol ICC): Active product status, extended operating temperature range (-65°C ~ 130°C), RoHS compliant. Gold contact finish (GXT™) with reduced thickness (15.0µin) compared to 77317-112-70LF. Appropriate for cost-optimized designs.
892-70-070-20-001101 (Preci-Dip): Active product status, ROHS3 compliant, operating temperature range -55°C ~ 125°C. Brass contact material with gold finish (flash thickness). Voltage rating specified at 150VDC.
961270-5804-AR (3M): Active product status, RoHS compliant. Note: Current rating is 2A per contact (lower than original 3A specification). Operating temperature range -25°C ~ 105°C matches original specification. Suitable only for applications with current requirements ≤2A per contact.

Non-Substitute:

M20-9953645 (Harwin Inc.): Although from the same manufacturer and series, this part has 72 positions versus the required 70 positions. This configuration change makes it incompatible with existing PCB layouts and connector receptacles designed for 70-position headers.

Frequently Asked Questions (FAQ)

Q: Can M20-9953645 (72-position) be used as a substitute for M20-9953545 (70-position)?

A: No. The 72-position configuration is not compatible with PCB layouts and mating connectors designed for 70-position headers. Position count is a non-negotiable parameter for connector substitution.

Q: What is the difference between the three Amphenol 77317 variants?

A: The three variants differ in contact finish specifications: 77317-112-70LF uses gold (GXT™) at 30.0µin thickness; 77317-412-70LF uses tin at 78.7µin thickness; 77317-812-70LF uses gold (GXT™) at 15.0µin thickness. All three maintain identical electrical and mechanical compatibility. Selection depends on finish durability requirements and cost considerations.

Q: Is 961270-5804-AR (3M) suitable for all applications?

A: No. The 961270-5804-AR has a current rating of 2A per contact, compared to the original 3A specification. This part is suitable only for applications where individual contact current does not exceed 2A. Applications requiring 3A per contact must use alternative substitutes.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All listed substitutes are either ROHS3 compliant or RoHS compliant, meeting current environmental regulations. The original M20-9953545 is ROHS3 compliant.

Q: What is the impact of operating temperature range differences?

A: Most substitutes offer extended operating temperature ranges beyond the original -40°C ~ 105°C specification. Extended ranges provide additional design margin but do not affect compatibility in applications operating within the original temperature window. The 961270-5804-AR has a narrower range (-25°C ~ 105°C) and is unsuitable for applications requiring operation below -25°C.

Q: Are there mechanical fit differences between substitutes?

A: Contact length specifications vary slightly between manufacturers. Mating contact lengths range from 0.236" to 0.272", and post lengths from 0.118" to 0.130". These variations are within acceptable tolerances for standard 0.100" pitch connector systems and do not affect mechanical fit or electrical performance in typical applications.

Q: What packaging options are available?

A: Substitute parts are available in Bulk (M20-9953645, 892-70-070-20-001101) or Bag (77317-112-70LF, 77317-412-70LF, 77317-812-70LF) packaging. Packaging selection does not affect electrical or mechanical compatibility.

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