Harwin M20-7881346 Equivalent & Substitute Parts

Part Overview

The Harwin M20-7881346 is a 26-position receptacle connector with 0.100" (2.54mm) pitch, designed for through-hole, right-angle board-to-board applications. This connector features tin contact finish, solder termination, and push-pull fastening. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system support, maintenance, and new design implementations where compatible alternatives are required.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	26
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Termination	Solder
Fastening Type	Push-Pull
Current Rating	3A
Voltage Rating	1000V
Operating Temperature	-40°C ~ 105°C
Contact Material	Phosphor Bronze
Insulation Material	Polyamide (PA6T), Nylon 6T
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Harwin M20-7881346 are qualified based on the following critical parameters that must match or exceed the original specification:

Core Matching Parameters:

Connector type: Receptacle
Contact type: Female socket
Number of positions: 26
Pitch - mating: 0.100" (2.54mm)
Number of rows: 2
Row spacing - mating: 0.100" (2.54mm)
Mounting type: Through hole, right angle
Termination: Solder
Fastening type: Push-pull
Contact material: Phosphor bronze
Contact shape: Square

Acceptable Variations:

Contact finish: Tin or gold (both acceptable for general purpose applications)
Insulation material: Polyamide or polyester (both acceptable)
Operating temperature range: May exceed original range
Current rating: May equal or exceed 3A
Voltage rating: May equal or exceed 1000V
RoHS compliance: ROHS3 compliant or equivalent

The four substitute parts listed below meet these core requirements and are therefore electrically and mechanically compatible with the original Harwin M20-7881346.

Parameter Comparison

Parameter	Harwin M20-7881346	Molex 0901522126	Molex 0901522226	TE 2-535512-0	TE 2-5535512-0
Manufacturer	Harwin Inc.	Molex	Molex	TE Connectivity	TE Connectivity
Product Status	Obsolete	Active	Active	Active	Active
Number of Positions	26	26	26	26	26
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2	2	2
Row Spacing - 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
Termination	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Tin	Tin	Gold	Gold	Gold
Insulation Color	Black	Black	Black	Black	Black
Operating Temperature	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating (Amps)	3A	3A	3A	2A	2A
Voltage Rating	1000V	350V	350V	Not specified	Not specified
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Molex 0901522126 is the primary substitute for applications requiring tin contact finish matching the original Harwin specification. This part maintains active product status, ROHS3 compliance, and equivalent electrical performance. The operating temperature range extends to -55°C, providing improved low-temperature performance. Voltage rating is reduced to 350V; applications requiring the original 1000V rating must use alternative selections.

Molex 0901522226 provides gold contact finish as an alternative to tin. Gold plating enhances corrosion resistance and contact reliability in demanding environments. This part maintains active status and ROHS3 compliance. The same voltage rating limitation (350V) applies as the 0901522126.

TE Connectivity 2-535512-0 and 2-5535512-0 are functionally equivalent alternatives with extended operating temperature range (-55°C to 125°C). Both parts feature gold contact finish. The 2-5535512-0 is preferred for new designs due to ROHS3 compliance; the 2-535512-0 is RoHS non-compliant and suitable only for legacy system support. Current rating is reduced to 2A for both TE parts; applications requiring 3A must use Molex alternatives. Voltage rating is not specified for TE parts.

For applications where the original 1000V voltage rating is critical, the Molex C-Grid III series (0901522126 or 0901522226) provides the highest voltage specification among available substitutes at 350V. If 1000V operation is mandatory, alternative connector families must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the Molex 0901522126 directly replace the Harwin M20-7881346?

A: Yes. Both parts share identical pitch (0.100"), position count (26), row configuration (2 rows), mounting style (through-hole right-angle), and termination method (solder). Tin contact finish matches the original specification. The primary difference is reduced voltage rating (350V vs. 1000V). Verify voltage requirements before substitution.

Q: What is the difference between Molex 0901522126 and 0901522226?

A: The primary difference is contact finish. The 0901522126 features tin contact finish, matching the original Harwin part. The 0901522226 features gold contact finish, which provides enhanced corrosion resistance. Both are electrically and mechanically compatible. Gold finish is preferred for high-reliability or corrosive environment applications.

Q: Why do the TE Connectivity parts have lower current rating (2A vs. 3A)?

A: Current rating is determined by contact geometry and material properties specific to each connector design. The TE AMPMODU Mod II series is rated for 2A maximum. Applications requiring 3A continuous current must use the Molex C-Grid III series (0901522126 or 0901522226).

Q: Are the TE Connectivity 2-535512-0 and 2-5535512-0 interchangeable?

A: Yes, they are mechanically and electrically interchangeable. The primary difference is RoHS compliance status. The 2-5535512-0 is ROHS3 compliant and is preferred for new designs and systems with RoHS requirements. The 2-535512-0 is RoHS non-compliant and should be used only for legacy system maintenance where RoHS compliance is not required.

Q: What packaging options are available?

A: Harwin M20-7881346 packaging is not specified. Molex 0901522126 is supplied in standard packaging. Molex 0901522226 is supplied in tube packaging. TE Connectivity 2-535512-0 is supplied in tube packaging. TE Connectivity 2-5535512-0 is supplied in bag packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Can these connectors be used in automotive applications?

A: The Molex C-Grid III series (0901522126 and 0901522226) lists automotive applications in their specification. The TE AMPMODU Mod II series does not specify automotive applications. Consult application-specific requirements and manufacturer documentation for automotive system integration.

Q: What is the voltage limitation for substitute parts?

A: The original Harwin M20-7881346 is rated for 1000V. Molex substitutes are rated for 350V. TE Connectivity substitutes do not specify voltage rating. For applications requiring voltages above 350V, the Molex parts are the only qualified substitutes among those listed. Applications exceeding 350V require evaluation of alternative connector families.

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