Molex 0751020117 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The Molex 0751020117 is a through-hole rectangular connector header with 80 positions arranged in 2 rows at 0.100" (2.54mm) pitch. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The connector features male pins with press-fit and solder termination options, suitable for board-to-board or cable interconnection in automotive, medical, telecommunications, and general-purpose applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	0751020117
Manufacturer	Molex
Category	Rectangular Connectors
Connector Type	Header, Breakaway
Contact Type	Male Pin
Number of Positions	80
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Press-Fit, Solder
Fastening Type	Push-Pull
Contact Shape	Square
Insulation Material	Liquid Crystal Polymer (LCP), Glass Filled
Material Flammability Rating	UL94 V-0
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0751020117 is determined by the following critical parameters:

Primary Matching Criteria:

Number of Positions: 80
Number of Rows: 2
Pitch - Mating: 0.100" (2.54mm)
Row Spacing - Mating: 0.100" (2.54mm)
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Fastening Type: Push-Pull
Contact Shape: Square

Secondary Compatibility Factors:

Termination method (Solder acceptable)
Insulation material (thermoplastic or LCP acceptable)
Material Flammability Rating (UL94 V-0 required)
RoHS compliance status
Moisture Sensitivity Level (MSL 1 acceptable)

The substitute parts listed below maintain compatibility with the original connector's mating interface and mounting footprint. Variations in contact finish, contact length, and insulation height do not affect mechanical or electrical interchangeability for standard board-to-board applications.

Parameter Comparison

Parameter	Molex 0751020117	3M 2380-6121TG	TE Connectivity 4-87545-0	Sullins PREC040DAAN-RC	Sullins PRPC040DABN-RC
Number of Positions	80	80	80	80	80
Number of Rows	2	2	2	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Press-Fit, Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Shape	Square	Square	Square	Square	Square
Contact Finish - Mating	Tin	Gold	Gold	Tin	Gold
Contact Material	Copper Alloy	Copper Alloy	Phosphor Bronze	Brass	Brass
Insulation Material	LCP, Glass Filled	Thermoplastic, Glass Filled	Thermoplastic	PBT	PBT
Material Flammability Rating	UL94 V-0	UL94 V-0	Not specified	UL94 V-0	UL94 V-0
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute - Sullins PREC040DAAN-RC: This connector is the preferred substitute for the Molex 0751020117. It maintains full mechanical and electrical compatibility with identical position count, row configuration, and pitch specifications. The part is active in production, ROHS3 compliant, and carries UL94 V-0 flammability certification. The tin contact finish and brass material provide equivalent performance for standard applications.

Secondary Substitute - Sullins PRPC040DABN-RC: This variant offers gold-plated contacts with identical mechanical dimensions and electrical characteristics. It is ROHS3 compliant and UL94 V-0 rated. The gold finish provides enhanced corrosion resistance for applications requiring extended shelf life or harsh environmental exposure.

Alternative Substitute - 3M 2380-6121TG: This connector provides full mechanical compatibility and is available in high inventory. However, it is RoHS non-compliant, which may restrict use in regulated industries or applications with RoHS requirements. The gold contact finish and thermoplastic insulation material are functionally equivalent to the original design.

Alternative Substitute - TE Connectivity 4-87545-0: This AMPMODU Mod II series connector maintains the required 80-position, 2-row configuration with 2.54mm pitch. It is ROHS3 compliant but lacks specified flammability rating documentation. The phosphor bronze contact material and longer overall contact length (1.016") may require PCB footprint verification before implementation.

Frequently Asked Questions (FAQ)

Q: Can I use a 40-position connector as a substitute for the 80-position Molex 0751020117?

A: No. The 40-position variants (PREC040SABN-RC, PREC040SACN-RC, PREC040SADN-RC, PREC040SAEN-RC) have different position counts and row configurations. These are not interchangeable with the 80-position, 2-row original connector. Position count and row spacing are critical parameters that determine mating interface compatibility.

Q: What is the difference between tin and gold contact finishes?

A: Both tin and gold finishes are acceptable for the 2.54mm pitch rectangular connector application. Gold provides superior corrosion resistance and is preferred for high-reliability or long-term storage applications. Tin is suitable for standard industrial and general-purpose use. The contact finish does not affect mechanical interchangeability.

Q: Does RoHS compliance matter for my application?

A: RoHS compliance is mandatory for products sold in the European Union and for many regulated industries including medical and automotive. If your application requires RoHS certification, select PREC040DAAN-RC, PRPC040DABN-RC, or 4-87545-0. The 3M 2380-6121TG is RoHS non-compliant and unsuitable for regulated applications.

Q: Are there differences in insulation material between substitutes?

A: Yes. The original Molex uses Liquid Crystal Polymer (LCP) with glass fill. Substitutes use either thermoplastic or Polybutylene Terephthalate (PBT). All materials specified carry UL94 V-0 flammability ratings and are functionally equivalent for board-to-board connector applications. Material selection does not affect electrical or mechanical performance in standard operating conditions.

Q: What is the significance of contact length variations?

A: Contact length affects the depth of insertion and mating force characteristics. The original Molex has an overall contact length of 0.517" (13.13mm). Substitutes range from 0.450" to 1.016". Variations within 0.100" are generally acceptable for standard PCB applications. Verify PCB pad depth and connector cavity depth if contact length differs by more than 0.150" from the original specification.

Q: Can I mix substitute parts in the same assembly?

A: Yes, all listed substitutes are mechanically and electrically interchangeable. However, for consistency and supply chain management, it is recommended to standardize on a single substitute part number per assembly design.

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