Molex 0877050021 240 Position DIMM DDR2 SDRAM Socket — Equivalent & Substitute Parts

Part Overview

The Molex 0877050021 is a 240 position DIMM DDR2 SDRAM socket connector designed for through-hole PCB mounting. This connector features board lock and latches, gold-plated contacts, and complies with MO-237 standards. The part is currently obsolete, making equivalent and substitute parts necessary for legacy system maintenance, board redesigns, and component sourcing.

Substiute Parts

0877050021

MolexIn Stock: 10060877050021 Datasheet

Current PartRFQ

10005639-12207LF

Amphenol ICC (FCI)In Stock: 95310005639-12207LF Datasheet

MFR RecommendedRFQ

10037402-11107LF

Amphenol ICC (FCI)In Stock: 76910037402-11107LF Datasheet

MFR RecommendedRFQ

10037402-11109LF

Amphenol ICC (FCI)In Stock: 93010037402-11109LF Datasheet

MFR RecommendedRFQ

10081531-11107LF

Amphenol ICC (FCI)In Stock: 116510081531-11107LF Datasheet

MFR RecommendedRFQ

10081531-11108LF

Amphenol ICC (FCI)In Stock: 114710081531-11108LF Datasheet

MFR RecommendedRFQ

10081531-11117LF

Amphenol ICC (FCI)In Stock: 80910081531-11117LF Datasheet

MFR RecommendedRFQ

10081531-11207LF

Amphenol ICC (FCI)In Stock: 85910081531-11207LF Datasheet

MFR RecommendedRFQ

10081531-11208LF

Amphenol ICC (FCI)In Stock: 87410081531-11208LF Datasheet

MFR RecommendedRFQ

10081531-11217LF

Amphenol ICC (FCI)In Stock: 103110081531-11217LF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the Molex 0877050021 is determined by the following critical parameters:

• Connector Style & Memory Type: The main part is a DIMM DDR2 SDRAM socket. Direct equivalents must maintain DIMM connector style and DDR2 SDRAM memory type with MO-237 standard compliance.
• Position Count: All substitutes must have 240 positions to ensure mechanical and electrical compatibility.
• Mounting Type: Through-hole mounting is required for PCB integration.
• Physical Dimensions: Card thickness (0.050" / 1.27mm) and mounting feature (Normal, Standard - Top) must be preserved.
• Contact Specifications: Gold plating with 15.0µin (0.38µm) minimum thickness ensures signal integrity and reliability.

Substitute parts are grouped into two categories:

1. Direct DDR2 SDRAM Equivalents (MO-237 Standard): Parts maintaining identical connector style, memory type, and standards.
2. Alternative Memory Type Substitutes (DDR2 FBDRAM and DDR3 SDRAM): Parts with different memory types or connector styles (FB-DIMM, RDIMM) that share 240-position configuration and through-hole mounting but operate under different standards (MO-256, MO-269).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended for DDR2 Systems):

Amphenol ICC 10005639-12207LF is the primary direct equivalent. It maintains identical connector style (DIMM), memory type (DDR2 SDRAM), standards compliance (MO-237), and physical specifications. This part is active and RoHS compliant, ensuring long-term availability and regulatory compliance.

Alternative Substitutes (For System Upgrades or Redesigns):

The Amphenol ICC 10037402 series (FB-DIMM DDR2 FBDRAM) and 10081531 series (RDIMM DDR3 SDRAM) represent alternative memory connector architectures. These parts share the 240-position configuration and through-hole mounting but operate under different standards (MO-256 and MO-269 respectively). Selection of these alternatives requires system-level compatibility verification, as they support different memory technologies and may require firmware or BIOS adjustments.

All substitute parts are manufactured by Amphenol ICC (FCI), are RoHS compliant, and maintain MSL 1 rating. Product status is active for all substitutes, ensuring availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use Amphenol ICC 10005639-12207LF as a direct replacement for Molex 0877050021?

A: Yes. Both parts are 240-position DIMM DDR2 SDRAM sockets with MO-237 standard compliance, identical card thickness (0.050" / 1.27mm), gold contact finish, and through-hole mounting. The Amphenol part is active and RoHS compliant.

Q: What is the difference between DIMM, FB-DIMM, and RDIMM connectors?

A: DIMM (Dual In-line Memory Module) is the standard DDR2 SDRAM socket. FB-DIMM (Fully Buffered DIMM) supports DDR2 FBDRAM with buffered architecture. RDIMM (Registered DIMM) supports DDR3 SDRAM with registered functionality. These are distinct connector styles operating under different standards (MO-237, MO-256, MO-269 respectively) and are not mechanically interchangeable.

Q: Can I substitute a DDR3 RDIMM socket for a DDR2 DIMM socket?

A: No. DDR3 RDIMM sockets (Amphenol ICC 10081531 series) operate under MO-269 standard and are designed for DDR3 SDRAM modules. They are not compatible with DDR2 SDRAM modules. System memory type and socket standard must match.

Q: What does contact finish thickness mean, and why does it vary?

A: Contact finish thickness specifies the gold plating depth on connector contacts. The Molex 0877050021 has 15.0µin (0.38µm) thickness. Some Amphenol substitutes offer 30.0µin (0.76µm) or 3.00µin (0.076µm) thickness. Thicker plating generally provides enhanced durability and corrosion resistance, while thinner plating reduces material cost. All specified thicknesses meet functional requirements for signal integrity.

Q: Are all substitute parts RoHS compliant?

A: Yes. The Molex 0877050021 is ROHS3 compliant, and all Amphenol ICC substitute parts are RoHS compliant. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of connector color (Black vs. Blue)?

A: Connector color is a visual identification feature and does not affect electrical or mechanical function. Black and blue variants are available in the Amphenol ICC 10081531 RDIMM series. Selection is based on design preference or inventory availability.