Molex 0791091221 Equivalent & Substitute Parts

Part Overview

The Molex 0791091221 is a 44-position receptacle connector featuring 0.079" (2.00mm) pitch surface mount technology with gold-plated mating contacts. This connector is part of the Milli-Grid 79109 series and is designed for board-to-board or cable applications requiring reliable electrical interconnection. The part maintains active product status with 1036 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements necessitate alternative connector specifications.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	44
Pitch - Mating	0.079" (2.00mm)
Number of Rows	2
Mounting Type	Surface Mount
Contact Type	Female Socket
Termination	Solder
Fastening Type	Push-Pull
Current Rating	1A
Contact Finish - Mating	Gold

Substitute Part Grouping Explanation

The 3M 150244-2020-RB is identified as a manufacturer-recommended substitute for the Molex 0791091221 based on the following critical parameters:

Connector Type & Contact Configuration: Both parts are 44-position receptacle connectors with female socket contacts
Pitch Specification: Both maintain 0.079" (2.00mm) mating pitch with 2-row configuration
Mounting Technology: Both utilize surface mount solder termination with push-pull fastening
Electrical Performance: Both support 1A current rating with gold-plated mating contacts
Physical Compatibility: Both feature board guide features and compatible insulation heights within acceptable tolerance ranges

Substitution is valid when the application requirements align with the electrical and mechanical specifications of both connectors.

Parameter Comparison

Parameter	Molex 0791091221	3M 150244-2020-RB	Compatibility Notes
Manufacturer	Molex	3M	Different manufacturers
Number of Positions	44	44	Identical
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	Identical
Number of Rows	2	2	Identical
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Termination	Solder	Solder	Identical
Fastening Type	Push-Pull	Push-Pull	Identical
Contact Type	Female Socket	Female Socket	Identical
Contact Finish - Mating	Gold	Gold	Identical
Contact Finish Thickness - Mating	15.0µin (0.38µm)	30.0µin (0.76µm)	3M part has thicker gold plating
Insulation Height	0.175" (4.45mm)	0.183" (4.65mm)	Minor dimensional difference
Current Rating	1A	1A	Identical
Voltage Rating	125V	500VDC	3M part rated for higher voltage
Operating Temperature	-55°C ~ 125°C	-55°C ~ 105°C	Molex part has higher upper temperature limit
Contact Material	Phosphor Bronze	Copper Alloy	Different base materials
Insulation Material	Thermoplastic, Glass Filled	Thermoplastic	Molex includes glass filler
Material Flammability Rating	Not specified	UL94 V-0	3M part has documented flammability rating
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both compliant
Packaging	Tube	Bulk	Different packaging formats
Inventory	1036 Pcs	1497 Pcs	3M part has higher stock availability

Engineering Selection Recommendations

Primary Part Selection: The Molex 0791091221 remains the specified component when design requirements include the upper operating temperature range of 125°C and glass-filled thermoplastic insulation material.

Substitute Selection: The 3M 150244-2020-RB is suitable as a substitute when:

Operating temperature requirements do not exceed 105°C
Higher voltage rating (500VDC) is beneficial or required
Thicker gold plating (30.0µin) provides enhanced contact durability
UL94 V-0 flammability rating meets application safety requirements
Bulk packaging accommodates procurement workflows

Both parts maintain RoHS compliance and REACH unaffected status. The electrical and mechanical compatibility is established through identical pitch, position count, mounting technology, and current rating specifications.

Frequently Asked Questions (FAQ)

Q: Can the 3M 150244-2020-RB directly replace the Molex 0791091221 in existing designs?

A: Direct mechanical and electrical substitution is supported based on identical pitch (0.079"), position count (44), mounting type (surface mount), and current rating (1A). Design verification is required if the application operates above 105°C, as the 3M part is rated to 105°C maximum versus the Molex part's 125°C rating.

Q: What are the key differences between these two connectors?

A: Primary differences include operating temperature range (Molex: -55°C to 125°C; 3M: -55°C to 105°C), voltage rating (Molex: 125V; 3M: 500VDC), contact finish thickness (Molex: 15.0µin; 3M: 30.0µin), and insulation material composition (Molex includes glass filler; 3M does not). The 3M part includes UL94 V-0 flammability certification.

Q: Are there packaging considerations when switching between these parts?

A: Yes. The Molex 0791091221 is supplied in tube packaging, while the 3M 150244-2020-RB is supplied in bulk packaging. Procurement and assembly processes may require adjustment to accommodate different packaging formats.

Q: Do both connectors meet RoHS requirements?

A: Yes. The Molex 0791091221 is ROHS3 compliant, and the 3M 150244-2020-RB is RoHS compliant. Both parts are REACH unaffected.

Q: Which part should be selected for high-temperature applications?

A: The Molex 0791091221 is specified for applications requiring continuous operation up to 125°C. The 3M 150244-2020-RB is limited to 105°C maximum operating temperature.

Q: What is the significance of the different contact materials?

A: The Molex part uses phosphor bronze contacts, while the 3M part uses copper alloy contacts. Both materials support the 1A current rating and gold-plated mating surface. Material selection affects mechanical properties and contact durability characteristics.

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