Amphenol ICC 51866-021 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51866-021 is a 46-position receptacle connector featuring female sockets and blade sockets for board edge, through-hole, right-angle mounting. This connector is part of the PwrBlade® series and provides a contact layout of 32 signal and 14 power positions with press-fit termination and guide pin features.

The 51866-021 is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for systems utilizing this connector architecture.

Substiute Parts

51866-021

Amphenol ICC (FCI)In Stock: 108251866-021 Datasheet

Current PartRFQ

51866-021LF

Amphenol ICC (FCI)In Stock: 119451866-021LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 51866-021 is based on strict equivalence across all critical electrical and mechanical parameters. The substitute part must maintain identical specifications in the following areas:

• Connector type, style, and socket configuration (receptacle with female sockets and blade sockets)
• Position count and arrangement (46 positions, 4 rows)
• Pitch and spacing (0.100" / 2.54mm)
• Mounting configuration (board edge, through-hole, right-angle)
• Termination method (press-fit)
• Contact layout distribution (32 signal, 14 power)
• Physical features (guide pin presence)
• Contact finish specification and thickness (gold or gold GXT™, 30.0µin)
• Color and material properties (black, UL94 V-0)
• Operating temperature range (-20°C ~ 105°C)
• Moisture sensitivity classification (MSL 1)

Parameter Comparison

Engineering Selection Recommendations

The 51866-021LF is the direct substitute for the obsolete 51866-021. Both parts are manufactured by Amphenol ICC and share identical electrical and mechanical specifications across all critical parameters including connector type, position count, pitch, mounting configuration, termination method, and contact layout.

The primary distinction between the two parts is product status and compliance posture. The 51866-021LF is classified as active and carries RoHS compliance certification, whereas the 51866-021 is obsolete and RoHS non-compliant. The 51866-021LF also includes REACH affected status documentation.

For new designs and ongoing production, the 51866-021LF is the appropriate selection. For legacy system support where the original 51866-021 specification must be maintained, the 51866-021LF provides full functional and mechanical compatibility while offering improved compliance and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Are the 51866-021 and 51866-021LF mechanically interchangeable?

A: Yes. Both connectors share identical mechanical specifications including mounting type, board edge configuration, through-hole design, right-angle orientation, and physical dimensions. They are direct mechanical substitutes.

Q: What is the difference between these two part numbers?

A: The primary differences are product lifecycle status and regulatory compliance. The 51866-021 is obsolete and RoHS non-compliant. The 51866-021LF is active, RoHS compliant, and includes REACH affected status. All electrical and mechanical parameters are identical.

Q: Can I use the 51866-021LF in place of the 51866-021 in existing designs?

A: Yes. The 51866-021LF provides full functional and mechanical compatibility with the 51866-021. The connector type, position count, pitch, mounting configuration, termination method, contact layout, and operating specifications are identical.

Q: What is the packaging difference?

A: The 51866-021LF is supplied in tray packaging. The original 51866-021 packaging specification was not provided in the technical documentation.

Q: Are there any electrical performance differences?

A: No. Both connectors maintain identical electrical specifications including contact finish (gold or gold GXT™), contact finish thickness (30.0µin), and operating temperature range (-20°C ~ 105°C).

Q: Why should I transition from the 51866-021 to the 51866-021LF?

A: The 51866-021 is obsolete, which creates supply chain risk. The 51866-021LF is an active product with confirmed inventory availability and improved regulatory compliance status (RoHS compliant). Functionally equivalent, it provides design continuity with enhanced long-term availability.