M20-9753842 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The M20-9753842 is a right-angle rectangular connector header manufactured by Harwin Inc., designed for through-hole mounting with 38 positions at 0.100" (2.54mm) pitch. This connector is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part features unshrouded male pin contacts with solder termination and push-pull fastening, suitable for board-to-board or cable interconnection in industrial and commercial electronics.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-9753842
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	38
Pitch - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
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 M20-9753842 is determined by strict adherence to the following critical parameters:

Connector pitch and position count: 0.100" (2.54mm) spacing with 38 positions
Mounting configuration: Through-hole, right-angle orientation
Contact type and termination: Male pin contacts with solder termination
Fastening mechanism: Push-pull fastening system
Electrical performance: Current rating of 3A per contact minimum
Environmental compliance: UL94 V-0 flammability rating and ROHS3 compliance
Operating temperature range: Minimum -40°C to 105°C capability
Contact finish: Gold mating surface for signal integrity

All substitute parts listed below meet these core substitution criteria. Variations in contact material, insulation material, contact post length, and insulation height are permissible within the scope of equivalent functionality for this connector category.

Parameter Comparison

Parameter	M20-9753842 (Harwin)	HTSW-138-08-G-S-RA (Samtec)	PRPC038SBAN-M71RC (Sullins)	TSW-138-10-L-S-RA (Samtec)	TSW-138-22-T-S-RA (Samtec)
Manufacturer	Harwin Inc.	Samtec Inc.	Sullins Connector Solutions	Samtec Inc.	Samtec Inc.
Product Status	Obsolete	Active	Active	Active	Active
Number of Positions	38	38	38	38	38
Pitch - Mating	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
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Termination	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.228" (5.80mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)
Contact Length - Post	0.118" (3.00mm)	0.090" (2.29mm)	0.120" (3.05mm)	0.390" (9.91mm)	0.190" (4.83mm)
Insulation Height	0.100" (2.54mm)	0.122" (3.10mm)	0.098" (2.50mm)	0.119" (3.02mm)	0.119" (3.02mm)
Contact Finish - Mating	Gold	Gold	Gold	Gold	Tin
Contact Finish - Post	Tin	Gold	Gold	Tin	Tin
Contact Material	Brass	Phosphor Bronze	Brass	Phosphor Bronze	Phosphor Bronze
Insulation Material	Polyamide (PA6T), Nylon 6T	Liquid Crystal Polymer (LCP)	Polybutylene Terephthalate (PBT)	Polybutylene Terephthalate (PBT)	Polybutylene Terephthalate (PBT)
Operating Temperature	-40°C ~ 105°C	-55°C ~ 125°C	-40°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C
Current Rating	3A per Contact	Varies by Wire Gauge	3A per Contact	Not Specified	Not Specified
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
Moisture Sensitivity Level	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All four substitute parts are active products with current manufacturing status, eliminating supply chain risk associated with the obsolete M20-9753842. Each substitute maintains ROHS3 compliance and UL94 V-0 flammability certification, meeting regulatory requirements for the original part.

HTSW-138-08-G-S-RA (Samtec) offers the widest operating temperature range (-55°C to 125°C) and features liquid crystal polymer insulation with enhanced thermal stability. This option is suitable for applications requiring extended temperature performance beyond the original specification.

PRPC038SBAN-M71RC (Sullins) provides the closest electrical and thermal match to the M20-9753842, with identical operating temperature range (-40°C to 105°C) and current rating (3A per contact). The breakaway connector type offers additional mechanical flexibility for applications requiring partial connector separation.

TSW-138-10-L-S-RA and TSW-138-22-T-S-RA (Samtec) both support extended operating temperatures (-55°C to 125°C and -55°C to 105°C respectively) with phosphor bronze contact material. These options differ primarily in contact post length, affecting PCB stack-up height and solder joint geometry. TSW-138-10-L-S-RA features extended post length (0.390"), while TSW-138-22-T-S-RA provides intermediate post length (0.190").

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the M20-9753842?

A: Yes. All listed substitute parts meet the core substitution criteria: 38-position, 0.100" pitch, through-hole right-angle headers with male pin contacts, solder termination, and push-pull fastening. Physical board layout compatibility depends on contact post length and insulation height variations, which must be verified against your specific PCB design.

Q: What is the primary difference between the Samtec HTSW and TSW series options?

A: The HTSW-138-08-G-S-RA features shorter contact posts (0.090") and liquid crystal polymer insulation with superior thermal performance. The TSW series offers variable post lengths (0.390" for TSW-138-10-L-S-RA and 0.190" for TSW-138-22-T-S-RA) with polybutylene terephthalate insulation. Selection depends on PCB stack-up requirements and thermal environment.

Q: Does the contact finish difference between gold and tin mating surfaces affect compatibility?

A: Contact finish affects signal integrity and corrosion resistance but does not prevent mechanical mating. The M20-9753842 and PRPC038SBAN-M71RC both feature gold mating surfaces. TSW-138-22-T-S-RA uses tin mating finish, which is acceptable for standard signal applications but may require evaluation for high-reliability or corrosive environments.

Q: Are there packaging differences I should consider?

A: The M20-9753842 packaging is not specified. PRPC038SBAN-M71RC is supplied in bulk packaging. Samtec parts (HTSW-138-08-G-S-RA, TSW-138-10-L-S-RA, TSW-138-22-T-S-RA) are available in standard packaging configurations. Confirm packaging requirements with your procurement process.

Q: Which substitute offers the best thermal performance?

A: HTSW-138-08-G-S-RA supports the highest operating temperature range (-55°C to 125°C) and uses liquid crystal polymer insulation, which provides superior thermal stability compared to polyamide or polybutylene terephthalate materials.

Q: Is the contact material difference (brass vs. phosphor bronze) significant?

A: Both materials are acceptable for this connector category. Phosphor bronze (used in Samtec TSW and HTSW series) offers slightly higher spring force and durability. Brass (used in M20-9753842 and PRPC038SBAN-M71RC) provides adequate performance for standard applications. Material selection does not affect electrical compatibility.

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