M20-9731246 Equivalent & Substitute Parts Reference

Part Overview

The Harwin M20-9731246 is a vertical rectangular connector header with 12 positions at 0.100" (2.54mm) pitch, designed for through-hole mounting with solder termination. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The M20 series provides board-to-board or cable connectivity with push-pull fastening and unshrouded construction.

Key Parameters

Parameter	M20-9731246 Value
Pitch - Mating	0.100" (2.54mm)
Number of Positions	12
Number of Rows	1
Connector Type	Header, Cuttable
Contact Type	Male Pin
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Shrouding	Unshrouded
Contact Finish - Mating	Tin
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
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters:

Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 12
Number of Rows: 1
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Shrouding: Unshrouded
Material Flammability Rating: UL94 V-0
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed meet these mandatory criteria. Variations in contact finish, contact material, insulation material, and operating temperature ranges are documented in the parameter comparison table. Connector type variations (Header vs. Header Breakaway, Cuttable vs. Breakaway) are noted where applicable.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Connector Type	Contact Finish - Mating	Contact Material	Insulation Material	Operating Temperature	Current Rating	RoHS Status
M20-9731246	Harwin Inc.	M20	Obsolete	Header, Cuttable	Tin	Brass	Polyamide (PA6T), Nylon 6T	-40°C ~ 105°C	3A per Contact	ROHS3 Compliant
M20-9731245	Harwin Inc.	M20	Active	Header, Cuttable	Gold	Brass	Polyamide (PA6T), Nylon 6T	-40°C ~ 105°C	3A per Contact	ROHS3 Compliant
0022284125	Molex	KK254, 42375	Active	Header, Breakaway	Gold	Not Specified	Polyamide (PA), Nylon, Glass Filled	Not Specified	Not Specified	ROHS3 Compliant
0901200132	Molex	C-Grid III 90120	Active	Header, Breakaway	Tin	Brass	Polyester, Glass Filled	-55°C ~ 125°C	Not Specified	ROHS3 Compliant
0901200772	Molex	C-Grid III 90120	Active	Header, Breakaway	Gold	Brass	Polyester, Glass Filled	-55°C ~ 125°C	Not Specified	ROHS3 Compliant
0901200932	Molex	C-Grid III 90120	Active	Header, Breakaway	Gold	Brass	Polyester, Glass Filled	-55°C ~ 125°C	Not Specified	ROHS3 Compliant
1-826629-2	TE Connectivity AMP Connectors	AMPMODU Mod II	Active	Header, Breakaway	Gold	Brass	Polybutylene Terephthalate (PBT)	-65°C ~ 105°C	5A	ROHS3 Compliant
77311-124-12	Amphenol ICC (FCI)	BERGSTIK®	Active	Header	Gold or Gold, GXT™	Phosphor Bronze	Thermoplastic	Not Specified	Not Specified	RoHS non-compliant
77311-170-12LF	Amphenol ICC (FCI)	BERGSTIK®	Active	Header	Gold or Gold, GXT™	Phosphor Bronze	Thermoplastic	-65°C ~ 125°C	3A per Contact	RoHS Compliant
890-18-012-10-002101	Preci-Dip	890	Active	Header	Gold	Brass	Polyamide (PA), Nylon, Glass Filled	-55°C ~ 125°C	3A	ROHS3 Compliant
TSW-112-24-F-S	Samtec Inc.	TSW	Active	Header	Gold	Phosphor Bronze	Polybutylene Terephthalate (PBT)	-55°C ~ 125°C	Not Specified	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: M20-9731245

The M20-9731245 from Harwin Inc. is the direct active equivalent. It maintains identical mechanical and electrical specifications to the M20-9731246 within the same product series, with the primary difference being contact finish (Gold vs. Tin). Both parts are ROHS3 compliant, carry MSL 1 rating, and share the same operating temperature range and current rating. This part is currently in active production status with 2121 units in stock.

Secondary Recommendations for Extended Temperature Range:

Parts 0901200132, 0901200772, 0901200932 (Molex C-Grid III 90120 series), 77311-170-12LF (Amphenol ICC BERGSTIK®), 890-18-012-10-002101 (Preci-Dip 890 series), and TSW-112-24-F-S (Samtec TSW series) all support extended operating temperature ranges (-55°C to -65°C minimum, 125°C maximum) compared to the original part's -40°C to 105°C range. These are suitable for applications requiring broader thermal performance.

Compliance Consideration:

Part 77311-124-12 is RoHS non-compliant and should not be selected for applications requiring RoHS3 compliance. Part 77311-170-12LF is the RoHS-compliant variant from the same BERGSTIK® series.

Contact Material and Finish Variations:

All substitute parts maintain UL94 V-0 flammability rating and MSL 1 moisture sensitivity. Contact finish variations (Tin vs. Gold) and contact material differences (Brass vs. Phosphor Bronze) are provided in the parameter comparison table and should be evaluated against specific application requirements for mating surface compatibility and corrosion resistance.

Frequently Asked Questions (FAQ)

Q: Can M20-9731245 directly replace M20-9731246?

A: Yes. M20-9731245 is the active equivalent from Harwin's M20 series. Both parts share identical pitch (0.100"), position count (12), mounting type (through-hole), termination (solder), and fastening (push-pull). The primary difference is contact finish: M20-9731245 uses gold-plated contacts versus tin-plated contacts on M20-9731246. Both are ROHS3 compliant with MSL 1 rating.

Q: What are the key differences between Harwin M20 and Molex C-Grid III 90120 headers?

A: Both meet the core substitution criteria (0.100" pitch, 12 positions, 1 row, male pins, through-hole solder termination, push-pull fastening, unshrouded). Molex C-Grid III parts support extended operating temperature (-55°C to 125°C vs. -40°C to 105°C). Insulation material differs: Harwin uses Polyamide (PA6T) Nylon 6T, while Molex uses Polyester Glass Filled. Contact material also varies: Harwin uses Brass, Molex uses Brass in some variants.

Q: Are TE Connectivity 1-826629-2 and Amphenol ICC 77311-170-12LF suitable substitutes?

A: Both parts meet core substitution criteria and are ROHS3 compliant. 1-826629-2 offers higher current rating (5A vs. 3A) and operates to -65°C minimum. 77311-170-12LF supports -65°C to 125°C operating range and maintains 3A current rating. Both use different insulation materials (PBT and Thermoplastic respectively) and contact materials (Brass and Phosphor Bronze). Mechanical compatibility with existing mating connectors should be verified before selection.

Q: Why is 77311-124-12 not recommended?

A: Part 77311-124-12 is RoHS non-compliant. If your application requires RoHS3 compliance, select 77311-170-12LF instead, which is the RoHS-compliant variant from the same BERGSTIK® series with equivalent electrical and mechanical specifications.

Q: What packaging options are available for substitute parts?

A: Most substitute parts are supplied in Bulk packaging. M20-9731245 is available in Bulk. 77311-170-12LF is supplied in Bag packaging. Packaging selection may affect lead times and minimum order quantities. Verify packaging requirements with your procurement process.

Q: Can I use parts with different contact finishes interchangeably?

A: Contact finish (Tin vs. Gold) affects mating surface compatibility and corrosion resistance. Tin-plated contacts (M20-9731246, 0901200132) are suitable for standard applications. Gold-plated contacts (M20-9731245, 0022284125, 0901200772, 0901200932, 1-826629-2, 77311-124-12, 77311-170-12LF, 890-18-012-10-002101, TSW-112-24-F-S) provide enhanced corrosion resistance. Verify compatibility with your mating connector specification before substitution.

Q: Which substitute offers the widest operating temperature range?

A: Parts 0901200132, 0901200772, 0901200932, 77311-170-12LF, 890-18-012-10-002101, and TSW-112-24-F-S all support -55°C to 125°C or -65°C to 125°C operating ranges, compared to the original M20-9731246 range of -40°C to 105°C. Part 1-826629-2 supports -65°C to 105°C. Select based on your specific thermal requirements.

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