Equivalent & Substitute Parts for M20-9970946

Part Overview

The Harwin M20-9970946 is a rectangular connector header with 18 positions at 2.54mm pitch, designed for through-hole mounting in board-to-board or cable applications. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility while offering continued availability and support.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9970946
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
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
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 for the M20-9970946 is determined by the following critical parameters that must remain constant:

Number of Positions: 18
Number of Rows: 2
Pitch - Mating: 0.100" (2.54mm)
Row Spacing - Mating: 0.100" (2.54mm)
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Style: Board to Board or Cable
Insulation Height: 0.100" (2.54mm)
Contact Shape: Square
Current Rating: 3A per Contact
Material Flammability Rating: UL94 V-0

Substitute parts are grouped into two categories:

Category 1: Direct Position Match (18 Positions) Harwin M20-9971046 and Sullins Connector Solutions parts (PBC09 and PEC09 series) maintain identical position count, pitch, and row spacing. These parts differ in contact length post dimensions, connector type (breakaway vs. cuttable), contact material, and insulation material composition.

Category 2: Position Variance The Harwin M20-9971046 provides 20 positions instead of 18, offering increased capacity while maintaining all other critical mating parameters.

Parameter Comparison

Parameter	M20-9970946	M20-9971046	PBC09DFAN	PBC09DFBN	PBC09DFCN	PBC09DFDN	PBC09DFEN	PEC09DFAN	PEC09DFBN	PEC09DFCN
Manufacturer	Harwin Inc.	Harwin Inc.	Sullins	Sullins	Sullins	Sullins	Sullins	Sullins	Sullins	Sullins
Number of Positions	18	20	18	18	18	18	18	18	18	18
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)
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)
Contact Type	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
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Current Rating	3A per Contact	3A per Contact	3A	3A	3A	3A	3A	3A	3A	3A
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 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

Engineering Selection Recommendations

For Direct 18-Position Replacement:

The Harwin M20-9971046, while offering 20 positions, maintains full compatibility with the M20-9970946 in all critical mating parameters. This part is active and carries ROHS3 compliance with identical flammability rating.

The Sullins Connector Solutions PBC09 and PEC09 series (DFAN, DFBN, DFCN, DFDN, DFEN variants) provide 18-position equivalents with active product status. All variants maintain identical pitch, row spacing, contact type, mounting method, and current rating. These parts offer extended operating temperature range (-65°C to 125°C versus -40°C to 105°C) and are ROHS3 compliant.

Contact Material and Finish Considerations:

PBC09 series: Phosphor Bronze contacts with gold mating finish (10.0µin) and tin post finish (100.0µin)
PEC09 series: Phosphor Bronze contacts with tin mating finish (100.0µin) and tin post finish (100.0µin)
M20-9970946 original: Brass contacts with tin finish on both mating and post

Connector Type Variation:

The original M20-9970946 features a cuttable header design. All Sullins substitutes employ breakaway connector type, which provides individual position separation capability.

Insulation Material:

The original part uses Polyamide (PA6T) Nylon 6T insulation. Sullins substitutes use Polybutylene Terephthalate (PBT) insulation, which maintains UL94 V-0 flammability rating.

Frequently Asked Questions (FAQ)

Q: Can M20-9971046 (20-position) be used as a direct replacement for M20-9970946 (18-position)?

A: M20-9971046 maintains all critical mating parameters including pitch, row spacing, contact type, and current rating. The additional two positions do not affect compatibility with existing 18-position mating connectors. However, the physical footprint is larger due to increased position count.

Q: What is the difference between PBC09 and PEC09 series substitutes?

A: Both series use identical mechanical specifications and Phosphor Bronze contact material. The primary difference is contact finish: PBC09 features gold mating finish while PEC09 features tin mating finish. Both maintain 100.0µin tin post finish.

Q: How do contact length post variations (DFAN, DFBN, DFCN, DFDN, DFEN) affect substitution?

A: Contact length post dimensions vary from 0.120" (3.05mm) to 0.520" (13.21mm) across the series. Selection depends on PCB thickness and application requirements. All variants maintain identical mating contact length (0.318") and insulation height (0.100").

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitutes including M20-9971046, PBC09 series, and PEC09 series are ROHS3 compliant. The original M20-9970946 is also ROHS3 compliant.

Q: What is the inventory status of substitute parts?

A: M20-9971046 has 4883 units in stock. Sullins PBC09 variants range from 686 to 1393 units. Sullins PEC09 variants range from 972 to 1147 units. All substitutes are classified as active products.

Q: Does the breakaway connector type of Sullins parts affect compatibility?

A: Breakaway design allows individual position separation after assembly. This does not affect mating compatibility with standard connectors. The cuttable design of the original part provides similar modularity through cutting rather than breaking.

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