Molex 0877051021 240 Position DIMM DDR2 SDRAM Socket Equivalent & Substitute Parts

Part Overview

The Molex 0877051021 is a 240 position DIMM DDR2 SDRAM socket connector designed for through-hole PCB mounting. This connector features board lock and latches, with gold-plated contacts and black housing. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	0877051021
Manufacturer	Molex
Category	Memory Connectors
Connector Style	DIMM
Number of Positions	240
Memory Type	DDR2 SDRAM
Standards	MO-237
Mounting Type	Through Hole
Features	Board Lock, Latches
Mounting Feature	Normal, Standard - Top
Card Thickness	0.050" (1.27mm)
Height	0.610" (15.50mm)
Color	Black
Contact Finish	Gold
Contact Finish Thickness	15.0µin (0.38µm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the Molex 0877051021 is determined by strict alignment of the following critical parameters:

Primary Compatibility Criteria:

Connector Style: DIMM
Number of Positions: 240
Mounting Type: Through Hole
Features: Board Lock, Latches
Mounting Feature: Normal, Standard - Top
Card Thickness: 0.050" (1.27mm)
Contact Finish: Gold
RoHS Compliance: Required
MSL Rating: 1 (Unlimited)

Memory Type Considerations: The original part supports DDR2 SDRAM (MO-237 standard). Substitute parts are grouped into two categories:

DDR2 SDRAM Direct Equivalents – Parts maintaining DDR2 SDRAM compatibility with MO-237 standard
DDR3 SDRAM Alternatives – Parts supporting DDR3 SDRAM with MO-269 standard, offering forward compatibility for newer memory architectures

All substitute parts are manufactured by Amphenol ICC (FCI) and maintain active product status, ensuring long-term availability and supply chain reliability.

Parameter Comparison

Part Number	Manufacturer	Memory Type	Standard	Positions	Color	Contact Finish Thickness	Product Status	RoHS Status
0877051021	Molex	DDR2 SDRAM	MO-237	240	Black	15.0µin (0.38µm)	Obsolete	ROHS3 Compliant
10005639-12207LF	Amphenol ICC (FCI)	DDR2 SDRAM	MO-237	240	Black	15.0µin (0.38µm)	Active	RoHS Compliant
10068597-11107LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Black	15.0µin (0.38µm)	Active	RoHS Compliant
10068597-11108LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Black	30.0µin (0.76µm)	Active	RoHS Compliant
10068597-11109LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Black	3.00µin (0.076µm)	Active	RoHS Compliant
10068597-11117LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Blue	15.0µin (0.38µm)	Active	RoHS Compliant
10068597-11118LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Blue	30.0µin (0.76µm)	Active	RoHS Compliant
10068597-11119LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Blue	3.00µin (0.076µm)	Active	RoHS Compliant
10068597-11127LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Black	15.0µin (0.38µm)	Active	RoHS Compliant
10068597-11129LF	Amphenol ICC (FCI)	DDR3 SDRAM	MO-269	240	Black	3.00µin (0.076µm)	Active	RoHS Compliant
10068597-11137LF	Amphenol ICC (FCI)	DDR2 SDRAM	MO-269	240	Black	15.0µin (0.38µm)	Active	RoHS Compliant

Engineering Selection Recommendations

For Direct DDR2 SDRAM Replacement:

The Amphenol ICC (FCI) part 10005639-12207LF provides the closest functional equivalent to the Molex 0877051021. This part maintains DDR2 SDRAM compatibility, identical contact finish thickness, and active product status. Selection of this part ensures seamless integration into existing DDR2 memory socket designs without architectural modification.

For DDR3 SDRAM Forward Compatibility:

The Amphenol ICC (FCI) 10068597 series offers DDR3 SDRAM socket alternatives with MO-269 standard compliance. These parts are suitable for new designs targeting DDR3 memory support. Within this series, selection depends on contact finish thickness requirements and housing color preference:

Black housing variants: 10068597-11107LF, 10068597-11108LF, 10068597-11109LF, 10068597-11127LF, 10068597-11129LF
Blue housing variants: 10068597-11117LF, 10068597-11118LF, 10068597-11119LF

Contact finish thickness options (15.0µin, 30.0µin, or 3.00µin) accommodate different durability and cost requirements.

Compliance Assurance:

All substitute parts maintain RoHS compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the original Molex part. The transition from ROHS3 to RoHS compliance reflects current regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol ICC (FCI) 10005639-12207LF directly replace the Molex 0877051021 in existing designs?

A: Yes. The 10005639-12207LF maintains identical DDR2 SDRAM memory type, 240 position count, through-hole mounting, board lock and latch features, and contact finish specifications. No design modification is required for direct substitution.

Q: What is the difference between DDR2 and DDR3 socket variants in the substitute list?

A: DDR2 SDRAM sockets (MO-237 standard) are designed for DDR2 memory modules, while DDR3 SDRAM sockets (MO-269 standard) are designed for DDR3 memory modules. These are not interchangeable at the memory module level. Select based on the memory type required by your application.

Q: Does contact finish thickness affect electrical performance?

A: Contact finish thickness (15.0µin, 30.0µin, or 3.00µin) does not affect electrical performance. Thicker finishes provide extended contact durability under repeated insertion cycles, while thinner finishes reduce material cost. Selection depends on expected connector lifecycle and cost constraints.

Q: Why are some substitute parts available in blue housing instead of black?

A: Housing color is a cosmetic and organizational feature with no impact on electrical or mechanical function. Blue housing variants (10068597-11117LF, 10068597-11118LF, 10068597-11119LF) are functionally equivalent to black housing variants. Selection is based on design preference or inventory availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Amphenol ICC (FCI) substitute parts listed maintain RoHS compliance, meeting current environmental and regulatory standards. The original Molex part carries ROHS3 compliance; the substitute parts carry current RoHS compliance status.

Q: What is the MSL rating for substitute parts?

A: All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity level, identical to the original Molex part. This rating indicates no moisture sensitivity restrictions during storage or handling.

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