Molex 0901200129 Equivalent & Substitute Parts

Part Overview

The Molex 0901200129 is a 9-position vertical header connector with 0.100" (2.54mm) pitch, designed for through-hole board-to-board or cable applications. This connector features male pins with tin-plated brass contacts, polyester glass-filled insulation, and operates across -55°C to 125°C. The part maintains Active product status with 1978 units in stock and carries ROHS3 compliance.

Substitute parts are necessary when the original Molex 0901200129 becomes unavailable, when design requirements demand alternative contact finishes or insulation materials, or when specific compliance certifications are required for particular applications.

Key Parameters

Parameter	Molex 0901200129
Pitch - Mating	0.100" (2.54mm)
Number of Positions	9
Number of Rows	1
Contact Type	Male Pin
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Tin
Contact Material	Brass
Insulation Material	Polyester, Glass Filled
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution validity for the Molex 0901200129 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 9
Number of Rows: 1
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Material Flammability Rating: UL94 V-0

Allowable Variations:

Contact Finish - Mating: Tin or Gold acceptable
Contact Material: Brass or Copper Alloy acceptable
Insulation Material: Polyester Glass Filled, Polyamide (PA6T), Nylon 6T, Polybutylene Terephthalate (PBT), or Liquid Crystal Polymer (LCP) acceptable
Operating Temperature Range: Must encompass or equal the original -55°C to 125°C range, or be acceptable for the specific application
RoHS Status: ROHS3 Compliant or RoHS Compliant acceptable; RoHS non-compliant parts noted for restricted applications

All nine substitute parts listed meet the critical parameters and fall within allowable variations for contact finish, contact material, and insulation material.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Pitch (mm)	Positions	Contact Finish - Mating	Contact Material	Insulation Material	Operating Temperature	Current Rating	RoHS Status	Product Status
0901200129	Molex	2.54	9	Tin	Brass	Polyester, Glass Filled	-55°C ~ 125°C	—	ROHS3 Compliant	Active
61300911121	Würth Elektronik	2.54	9	Gold	Copper Alloy	Polyamide (PA6T), Nylon 6T	-40°C ~ 105°C	3A	ROHS3 Compliant	Active
826629-9	TE Connectivity AMP Connectors	2.54	9	Gold	Brass	Polybutylene Terephthalate (PBT)	-65°C ~ 105°C	5A	RoHS Compliant	Active
929647-02-09-I	3M	2.54	9	Gold	Copper Alloy	Polybutylene Terephthalate (PBT), Polyester, Glass Filled	-40°C ~ 105°C	2.5A	RoHS Compliant	Active
929834-02-09	3M	2.54	9	Tin-Lead	Copper Alloy	Polybutylene Terephthalate (PBT), Polyester, Glass Filled	-40°C ~ 105°C	2.5A	RoHS non-compliant	Active
A2-9PA-2.54DSA(71)	Hirose Electric Co Ltd	2.54	9	Gold	Brass	Polybutylene Terephthalate (PBT)	-55°C ~ 85°C	3A	RoHS Compliant	Active
HTSW-109-24-T-S	Samtec Inc.	2.54	9	Tin	Phosphor Bronze	Liquid Crystal Polymer (LCP)	-55°C ~ 105°C	Varies by Wire Gauge	ROHS3 Compliant	Active
M20-9730946	Harwin Inc.	2.54	9	Tin	Brass	Polyamide (PA6T), Nylon 6T	-40°C ~ 105°C	3A per Contact	ROHS3 Compliant	Active
M20-9990945	Harwin Inc.	2.54	9	Gold	Brass	Polyamide (PA6T), Nylon 6T	-40°C ~ 105°C	3A per Contact	ROHS3 Compliant	Active
M20-9990946	Harwin Inc.	2.54	9	Tin	Brass	Polyamide (PA6T), Nylon 6T	-40°C ~ 105°C	3A per Contact	ROHS3 Compliant	Active

Engineering Selection Recommendations

ROHS3 Compliant Direct Substitutes (Preferred for New Designs):

Würth Elektronik 61300911121: Active status, ROHS3 compliant, gold-plated contacts, polyamide insulation. Operating temperature reduced to -40°C ~ 105°C.
Samtec Inc. HTSW-109-24-T-S: Active status, ROHS3 compliant, tin-plated phosphor bronze contacts, LCP insulation. Maintains -55°C ~ 105°C operating range.
Harwin Inc. M20-9730946, M20-9990945, M20-9990946: All Active status, ROHS3 compliant, cuttable header design. M20-9730946 and M20-9990946 feature tin plating; M20-9990945 features gold plating. All rated -40°C ~ 105°C.

RoHS Compliant Substitutes (Acceptable for Existing Designs):

TE Connectivity AMP Connectors 826629-9: Active status, RoHS compliant, gold-plated brass contacts, PBT insulation. Extended lower temperature rating to -65°C. Higher current rating of 5A.
3M 929647-02-09-I: Active status, RoHS compliant, gold-plated copper alloy contacts, mixed PBT and polyester glass-filled insulation. Current rating 2.5A.
Hirose Electric Co Ltd A2-9PA-2.54DSA(71): Active status, RoHS compliant, gold-plated brass contacts, PBT insulation. Operating temperature upper limit reduced to 85°C.

Restricted Use (RoHS Non-Compliant):

3M 929834-02-09: Active status but RoHS non-compliant with tin-lead plating. Suitable only for applications where RoHS compliance is not required.

All substitute parts maintain Active product status and UL94 V-0 flammability rating. Selection should prioritize ROHS3 compliant options for new designs and applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Molex 0901200129 with any 9-position 2.54mm pitch header?

A: No. Substitution requires exact match of critical parameters: 9 positions, 0.100" (2.54mm) pitch, male pin contact type, through-hole mounting, solder termination, and UL94 V-0 flammability rating. Contact finish, contact material, and insulation material may vary within specified allowable ranges.

Q: What is the difference between tin-plated and gold-plated contacts?

A: Tin-plated contacts (Molex 0901200129, Samtec HTSW-109-24-T-S, Harwin M20-9730946, M20-9990946) provide standard corrosion resistance and cost efficiency. Gold-plated contacts (Würth 61300911121, TE Connectivity 826629-9, 3M 929647-02-09-I, Harwin M20-9990945, Hirose A2-9PA-2.54DSA(71)) offer enhanced corrosion resistance and lower contact resistance, beneficial for low-signal applications.

Q: Does operating temperature range affect substitution?

A: Yes. The Molex 0901200129 operates -55°C ~ 125°C. Substitute parts with reduced upper temperature limits (Würth 61300911121, 3M 929647-02-09-I, Harwin M20 series at -40°C ~ 105°C; Hirose A2-9PA-2.54DSA(71) at -55°C ~ 85°C) are acceptable only if the application does not require the full original temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: No. Würth 61300911121, Samtec HTSW-109-24-T-S, and all Harwin M20 variants are ROHS3 compliant. TE Connectivity 826629-9, 3M 929647-02-09-I, and Hirose A2-9PA-2.54DSA(71) are RoHS compliant. 3M 929834-02-09 is RoHS non-compliant. For new designs, prioritize ROHS3 compliant options.

Q: What is the significance of insulation material differences?

A: Insulation material affects mechanical properties, temperature stability, and moisture absorption. Polyester glass-filled (original) and Polybutylene Terephthalate (PBT) provide standard performance. Polyamide (PA6T) and Liquid Crystal Polymer (LCP) offer enhanced dimensional stability and lower moisture absorption. Selection depends on environmental exposure and mechanical stress requirements.

Q: Can I use the TE Connectivity 4-103327-9 as a substitute?

A: No. The TE Connectivity 4-103327-9 is a 40-position header, not a 9-position header. It does not meet the critical position requirement and is not a valid substitute.

Q: What does "cuttable" mean on Harwin M20 connectors?

A: Cuttable headers allow individual pins to be separated from the main connector strip, enabling custom pin configurations. This feature does not affect substitution validity for applications requiring the full 9-position connector.

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