M20-9733946 Equivalent & Substitute Parts

Part Overview

The M20-9733946 is a rectangular connector header manufactured by Harwin Inc., featuring 39 vertical positions with 0.100" (2.54mm) pitch spacing. This through-hole component is designed for board-to-board or cable connections with solder termination and push-pull fastening. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9733946
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	39
Number of Rows	1
Pitch - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
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 eligibility for the M20-9733946 is determined by strict adherence to the following critical parameters:

Primary Matching Criteria:

Number of Positions: 39
Number of Rows: 1
Pitch - Mating: 0.100" (2.54mm)
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Shrouding: Unshrouded
Style: Board to Board or Cable
Number of Positions Loaded: All

Acceptable Variation Parameters:

Contact Length - Mating: Variation within mechanical envelope constraints
Contact Length - Post: Variation within PCB assembly requirements
Overall Contact Length: Variation within stacking height tolerance
Insulation Height: Variation within board spacing requirements
Contact Material: Brass or Phosphor Bronze (both acceptable for electrical performance)
Contact Finish - Mating: Tin or Gold (both acceptable for mating surface)
Operating Temperature: Equal to or exceeding -40°C ~ 105°C range
Current Rating: Equal to or exceeding 3A per Contact
Insulation Material: Polyamide or Liquid Crystal Polymer (both acceptable)
RoHS Status: ROHS3 Compliant (mandatory)

All identified substitute parts meet these criteria and maintain functional equivalence with the original M20-9733946 component.

Parameter Comparison

Parameter	M20-9733946 (Harwin)	890-80-039-10-002101 (Preci-Dip)	MTLW-139-07-F-S-275 (Samtec)	MTLW-139-07-F-S-280 (Samtec)	MTLW-139-23-F-S-285 (Samtec)
Number of Positions	39	39	39	39	39
Number of Rows	1	1	1	1	1
Pitch - Mating	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	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.276" (7.00mm)	0.276" (7.00mm)	0.275" (6.99mm)	0.280" (7.11mm)	0.285" (7.24mm)
Contact Length - Post	0.122" (3.10mm)	0.118" (3.00mm)	0.095" (2.41mm)	0.090" (2.29mm)	0.100" (2.54mm)
Overall Contact Length	0.496" (12.60mm)	0.494" (12.54mm)	0.430" (10.92mm)	0.430" (10.92mm)	0.445" (11.30mm)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)	0.060" (1.52mm)	0.060" (1.52mm)	0.060" (1.52mm)
Contact Material	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Contact Finish - Mating	Tin	Tin	Gold	Gold	Gold
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA), Nylon, Glass Filled	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-40°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	3A per Contact	3A	5.2A per Contact	5.2A per Contact	5.2A per Contact
Material Flammability Rating	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
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

890-80-039-10-002101 (Preci-Dip) provides the closest dimensional match to the M20-9733946, with identical contact length specifications and matching insulation height. This part maintains equivalent electrical performance at 3A per contact and extends the operating temperature range to -55°C ~ 125°C. The component is active in production and ROHS3 compliant, making it suitable for direct replacement in applications requiring minimal mechanical redesign.

MTLW-139-07-F-S-275, MTLW-139-07-F-S-280, and MTLW-139-23-F-S-285 (Samtec Flex Stack series) offer enhanced electrical performance with 5.2A per contact current rating and extended operating temperature range to -55°C ~ 125°C. These components feature gold-plated mating contacts and phosphor bronze material, providing superior contact reliability. The reduced insulation height (0.060" versus 0.100") and shorter overall contact length require PCB layout verification to confirm mechanical compatibility. All three variants are active products with ROHS3 compliance.

Selection between Preci-Dip and Samtec alternatives depends on application-specific requirements: Preci-Dip for minimal redesign effort with equivalent performance, or Samtec for enhanced current capacity and contact durability in demanding environments.

Frequently Asked Questions (FAQ)

Q: Can the 890-80-039-10-002101 directly replace the M20-9733946 without PCB modification?

A: The 890-80-039-10-002101 maintains identical pitch (0.100"), position count (39), and insulation height (0.100"), enabling direct PCB footprint compatibility. Contact length variations (0.118" post versus 0.122" original) fall within standard solder joint tolerance ranges and do not require PCB redesign.

Q: What are the mechanical differences between Preci-Dip and Samtec alternatives?

A: The Preci-Dip 890-80-039-10-002101 maintains the original insulation height of 0.100" and comparable overall contact length of 0.494". Samtec MTLW series components feature reduced insulation height (0.060") and shorter overall contact length (10.92-11.30mm versus 12.54-12.60mm), requiring verification of mating connector clearance and board spacing constraints.

Q: Are all substitute parts RoHS3 compliant?

A: All identified substitute parts—890-80-039-10-002101, MTLW-139-07-F-S-275, MTLW-139-07-F-S-280, and MTLW-139-23-F-S-285—are ROHS3 compliant and suitable for applications requiring regulatory compliance.

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

A: The original M20-9733946 and Preci-Dip 890-80-039-10-002101 feature tin-plated mating contacts. Samtec MTLW series components use gold-plated mating contacts with 3.00µin thickness, providing enhanced corrosion resistance and contact reliability in high-reliability applications. Both finishes are acceptable for standard board-to-board connections.

Q: Do the Samtec alternatives support higher current applications?

A: Samtec MTLW series components are rated for 5.2A per contact, compared to 3A for the original M20-9733946 and Preci-Dip 890-80-039-10-002101. This enhanced current capacity accommodates higher-power applications without requiring connector redesign.

Q: What is the significance of the different Samtec part numbers (MTLW-139-07-F-S-275, -280, -285)?

A: The numeric suffix indicates contact length variation: -275 (0.275" mating), -280 (0.280" mating), and -285 (0.285" mating). These variants accommodate different mating connector depths while maintaining the same 39-position, 0.100" pitch configuration. Selection depends on specific mating connector requirements.

Q: Are all substitute parts available in equivalent packaging quantities?

A: Inventory levels vary: 890-80-039-10-002101 (833 pcs), MTLW-139-07-F-S-275 (658 pcs), MTLW-139-07-F-S-280 (765 pcs), and MTLW-139-23-F-S-285 (720 pcs). All are available in production quantities for immediate procurement.

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