M20-9752142 Equivalent & Substitute Parts

Part Overview

The M20-9752142 is a rectangular connector header manufactured by Harwin Inc., designed for through-hole, right-angle board-to-board or cable applications. This 21-position connector operates at 0.100" (2.54mm) pitch with male pin contacts rated for 3A per contact. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	M20-9752142
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	21
Number of Rows	1
Mounting Type	Through Hole, Right Angle
Termination	Solder
Current Rating	3A per Contact
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9752142 is determined by the following critical parameters:

Connector Configuration: 21-position, single-row, 0.100" (2.54mm) pitch header with male pins
Mounting Orientation: Through-hole, right-angle mounting
Electrical Rating: 3A per contact minimum
Termination Method: Solder termination
Compliance: UL94 V-0 flammability rating and RoHS3 compliance

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in contact material (brass vs. phosphor bronze), insulation material (polyamide vs. thermoplastic vs. liquid crystal polymer), contact finish composition, and operating temperature ranges do not preclude functional substitution when the primary parameters remain constant.

Parameter Comparison

Parameter	M20-9752142	77315-818-21LF	HTSW-121-08-F-S-RA	HTSW-121-08-L-S-RA	HTSW-121-22-G-S-RA	PRPC021SBAN-M71RC
Manufacturer	Harwin Inc.	Amphenol ICC (FCI)	Samtec Inc.	Samtec Inc.	Samtec Inc.	Sullins Connector Solutions
Product Status	Obsolete	Active	Active	Active	Active	Active
Connector Type	Header, Cuttable	Header, Breakaway	Header	Header	Header	Header, Breakaway
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
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)
Number of Positions	21	21	21	21	21	21
Number of Rows	1	1	1	1	1	1
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
Termination	Solder	Solder	Solder	Solder	Solder	Solder
Current Rating	3A per Contact	3A per Contact	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge	3A per Contact
Operating Temperature	-40°C ~ 105°C	-65°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Contact Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T	Thermoplastic	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Polybutylene Terephthalate (PBT)
Contact Length - Mating	0.228" (5.80mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)
Contact Length - Post	0.118" (3.00mm)	0.120" (3.05mm)	0.090" (2.29mm)	0.090" (2.29mm)	0.190" (4.83mm)	0.120" (3.05mm)
Insulation Height	0.100" (2.54mm)	0.094" (2.40mm)	0.122" (3.10mm)	0.122" (3.10mm)	0.122" (3.10mm)	0.098" (2.50mm)
Contact Finish - Mating	Gold	Gold or Gold, GXT™	Gold	Gold	Gold	Gold
Contact Finish - Post	Tin	Tin	Tin	Tin	Gold	Gold
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not Applicable	Not Applicable	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts maintain active product status with current manufacturer support, providing procurement and technical continuity advantages over the obsolete M20-9752142. Selection among substitutes should be based on the following criteria:

77315-818-21LF (Amphenol ICC): Recommended for applications requiring extended operating temperature range (-65°C ~ 125°C) and phosphor bronze contact material. RoHS compliant with thermoplastic insulation. Suitable for general-purpose board-to-board applications.

HTSW-121-08-F-S-RA (Samtec Inc.): Recommended for applications requiring extended operating temperature range (-55°C ~ 125°C) and liquid crystal polymer insulation. Wire gauge current rating requires verification against application requirements. Tin-plated post contacts.

HTSW-121-08-L-S-RA (Samtec Inc.): Functionally equivalent to HTSW-121-08-F-S-RA with identical electrical and thermal specifications. Differs only in contact finish thickness specification (10.0µin vs. 3.00µin mating surface gold plating).

HTSW-121-22-G-S-RA (Samtec Inc.): Recommended for applications requiring extended post contact length (0.190" vs. 0.090") and gold-plated post termination. Extended operating temperature range (-55°C ~ 125°C). Wire gauge current rating requires verification.

PRPC021SBAN-M71RC (Sullins Connector Solutions): Recommended for applications matching the original M20-9752142 operating temperature range (-40°C ~ 105°C) and 3A per contact current rating. Brass contact material with polybutylene terephthalate insulation. Breakaway connector type.

All substitute parts carry UL94 V-0 flammability certification and RoHS3 compliance, meeting regulatory requirements equivalent to or exceeding the original part specification.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the M20-9752142?

A: All listed parts share the critical functional parameters: 21-position, single-row, 0.100" (2.54mm) pitch, through-hole right-angle mounting, solder termination, and UL94 V-0 compliance. Physical board layout compatibility requires verification of contact post length and insulation height dimensions, as these vary among substitutes.

Q: What is the difference between the three Samtec HTSW variants?

A: HTSW-121-08-F-S-RA and HTSW-121-08-L-S-RA differ only in mating surface gold plating thickness (3.00µin vs. 10.0µin). HTSW-121-22-G-S-RA features significantly longer post contacts (0.190" vs. 0.090") and gold-plated post termination instead of tin. All three share identical pitch, position count, and operating temperature range.

Q: Does the contact material difference (brass vs. phosphor bronze) affect substitution?

A: Contact material differences do not preclude functional substitution. Both brass and phosphor bronze contacts with gold mating surface finish meet the electrical and mechanical requirements. Material selection may influence contact resistance characteristics and long-term reliability in specific environmental conditions, but both are acceptable for standard applications.

Q: Why do some substitutes list "Varies by Wire Gauge" for current rating?

A: Samtec HTSW series current ratings depend on the wire gauge of the mating cable or connector. The M20-9752142 and PRPC021SBAN-M71RC specify fixed 3A per contact ratings independent of wire gauge. Verify wire gauge compatibility for HTSW variants in applications requiring specific current capacity.

Q: Are there packaging or inventory considerations for these substitutes?

A: All substitute parts are listed as active products with current inventory availability. Packaging formats vary (Bulk or unspecified). Confirm packaging requirements and lead times with suppliers before design finalization.

Q: What is the significance of the "Breakaway" connector type designation?

A: Breakaway connectors feature perforated insulation allowing individual pins to be separated after assembly. This does not affect electrical or mechanical compatibility with applications designed for standard headers. Breakaway capability provides additional assembly flexibility if required.

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