M20-9752146 Equivalent & Substitute Parts

Part Overview

The M20-9752146 is a rectangular connector header manufactured by Harwin Inc., designed for through-hole, right-angle board-to-board applications with 21 positions at 0.100" (2.54mm) pitch. This connector features male pins with solder termination and is rated for 3A per contact across an operating temperature range of -40°C to 105°C.

The M20-9752146 is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where equivalent functionality is required.

Key Parameters

Parameter	Value
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
Fastening Type	Push-Pull
Contact Shape	Square
Current Rating	3A per Contact
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9752146 is determined by the following critical parameters:

Pitch and Position Count: All substitute parts maintain 0.100" (2.54mm) pitch with 21 positions in a single row, ensuring mechanical and electrical compatibility with mating connectors designed for the original part.
Mounting Configuration: All substitutes are through-hole, right-angle headers with solder termination and push-pull fastening, preserving board layout and assembly compatibility.
Contact Type and Shape: All substitutes feature male pins with square contact geometry, maintaining signal integrity and mating interface consistency.
Electrical Rating: All substitutes maintain 3A per contact current capacity, supporting equivalent power distribution requirements.
Environmental Compliance: All substitutes meet UL94 V-0 flammability rating and ROHS3 compliance, satisfying regulatory and safety requirements.
Thermal Range: Substitute parts operate within or exceed the original -40°C to 105°C range, ensuring functional reliability across specified environmental conditions.

Parameter Comparison

Parameter	M20-9752146 (Harwin)	77315-818-21LF (Amphenol ICC)	HTSW-121-08-F-S-RA (Samtec)	HTSW-121-08-L-S-RA (Samtec)	HTSW-121-22-G-S-RA (Samtec)	PREC021SBAN-M71RC (Sullins)
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
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Shape	Square	Square	Square	Square	Square	Square
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 Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Brass
Contact Finish - Mating	Tin	Gold or Gold, GXT™	Gold	Gold	Gold	Tin
Contact Finish - Post	Tin	Tin	Tin	Tin	Gold	Tin
Insulation Material	Polyamide (PA6T), Nylon 6T	Thermoplastic	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Polybutylene Terephthalate (PBT)
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
Current Rating	3A per Contact	3A per Contact	Varies by Wire Gauge	Varies by Wire Gauge	Varies by Wire Gauge	3A per Contact
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
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not Applicable	Not Applicable	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts are active products from established connector manufacturers and satisfy the core functional and compliance requirements of the M20-9752146. Selection among substitutes should be based on the following criteria:

Direct Functional Equivalents: The PREC021SBAN-M71RC from Sullins Connector Solutions provides the closest electrical and thermal characteristics to the original M20-9752146, maintaining identical operating temperature range (-40°C to 105°C), current rating (3A per contact), and contact material (brass with tin finish). This part is recommended for applications requiring minimal design modification.

Enhanced Thermal Performance: The 77315-818-21LF from Amphenol ICC and all HTSW series parts from Samtec extend the operating temperature range to -55°C to -65°C minimum and 125°C maximum, providing superior thermal margin for demanding environments. These parts are suitable for applications requiring extended temperature operation beyond the original specification.

Contact Finish Considerations: Parts featuring gold-plated contacts (77315-818-21LF, HTSW series) offer enhanced corrosion resistance and signal integrity compared to tin-plated contacts. Selection should account for environmental exposure and signal quality requirements.

Post Length Variations: The HTSW-121-08-F-S-RA and HTSW-121-08-L-S-RA feature shorter post lengths (0.090" / 2.29mm) compared to the original (0.118" / 3.00mm), while HTSW-121-22-G-S-RA provides extended post length (0.190" / 4.83mm). Post length selection depends on PCB thickness and assembly requirements.

All substitute parts maintain ROHS3 compliance and UL94 V-0 flammability rating, satisfying regulatory requirements equivalent to or exceeding the original specification.

Frequently Asked Questions (FAQ)

Q: Can the M20-9752146 be directly replaced with any of the listed substitutes?

A: Yes. All listed substitutes maintain the critical parameters that determine mechanical and electrical compatibility: 0.100" (2.54mm) pitch, 21 positions in a single row, through-hole right-angle mounting, male pin contacts with square geometry, solder termination, and push-pull fastening. Mating connectors designed for the M20-9752146 will accept any of these substitutes without modification.

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

A: The three Samtec HTSW variants differ in contact post length and finish: HTSW-121-08-F-S-RA and HTSW-121-08-L-S-RA both feature 0.090" post length with tin-plated posts, while HTSW-121-22-G-S-RA provides 0.190" post length with gold-plated posts. Post length selection depends on PCB thickness and solder joint requirements. All three maintain identical mating contact length (0.230"), pitch, and position count.

Q: Why do some substitutes list current rating as "Varies by Wire Gauge" instead of "3A per Contact"?

A: The Samtec HTSW series current rating depends on the wire gauge used in the application, as these connectors are designed for wire-to-board applications. The M20-9752146 and other substitutes specify a fixed 3A per contact rating for board-to-board applications. For wire-to-board applications using HTSW series connectors, consult Samtec documentation for wire gauge-specific current ratings.

Q: Are there any PCB layout considerations when substituting parts?

A: Insulation height varies slightly among substitutes (ranging from 0.094" to 0.122"), which may affect clearance to adjacent components or traces. Contact post length also varies (0.090" to 0.190"), which impacts solder joint formation and PCB thickness compatibility. Review PCB layout and assembly specifications to confirm compatibility with the selected substitute before implementation.

Q: Do all substitutes meet the same environmental and compliance standards?

A: All substitutes meet UL94 V-0 flammability rating and ROHS3 compliance. Operating temperature ranges vary: the M20-9752146 and PREC021SBAN-M71RC operate from -40°C to 105°C, while Amphenol ICC and Samtec parts extend to -65°C or -55°C minimum and 125°C maximum. Moisture sensitivity level is 1 (Unlimited) for the M20-9752146, PREC021SBAN-M71RC, and 77315-818-21LF, while Samtec HTSW series parts are not applicable for MSL classification.

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