Amphenol ICC 51939-004 Backplane Connector Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51939-004 is an 18-position right-angle header connector with male pins and blades, designed for board edge, through-hole mounting applications. It features a blade power connector style with integrated board lock and mating guide features. The part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure ongoing component availability for production and field service applications.

Substiute Parts

51939-004

Amphenol ICC (FCI)In Stock: 76351939-004 Datasheet

Current PartRFQ

51939-004LF

Amphenol ICC (FCI)In Stock: 79051939-004LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 51939-004 is based on strict equivalence across the following critical parameters:

• Connector Architecture: Header with male pins and blades, blade power style
• Electrical Configuration: 18 positions with 12 signal and 6 power contacts
• Physical Dimensions: 0.100" (2.54mm) pitch, 4-row configuration, right-angle board edge mounting
• Termination Method: Solder attachment through board holes
• Contact Properties: Gold or Gold GXT™ finish at 30.0µin thickness
• Environmental Ratings: UL94 V-0 flammability, -20°C to 105°C operating range, MSL 1

The 51939-004LF meets all these criteria and represents the active production equivalent within the PwrBlade® series.

Parameter Comparison

Engineering Selection Recommendations

The 51939-004LF is the direct functional equivalent of the obsolete 51939-004. Both components share identical electrical, mechanical, and environmental specifications across all critical parameters. The primary distinction is product status and regulatory compliance.

For new designs and production applications: Use 51939-004LF. This part is in active production status and meets current RoHS compliance requirements, ensuring long-term supply chain viability and regulatory alignment.

For legacy system maintenance: The 51939-004LF provides full functional compatibility with existing designs using the 51939-004, with no circuit board redesign required. The identical pitch, position count, mounting configuration, and contact layout ensure direct substitution.

Compliance consideration: The 51939-004LF's RoHS compliance status addresses regulatory requirements for new manufacturing and distribution in restricted substance jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can 51939-004LF be used as a direct replacement for 51939-004 without board redesign?

A: Yes. Both parts are identical in connector type, position count, pitch, mounting configuration, contact layout, and termination method. No circuit board modifications are required.

Q: What is the difference between 51939-004 and 51939-004LF?

A: The 51939-004LF is the active production equivalent. The primary differences are product status (active vs. obsolete) and RoHS compliance (compliant vs. non-compliant). All functional and electrical parameters are identical.

Q: Are there packaging differences between these parts?

A: The 51939-004 packaging is not specified in the available data. The 51939-004LF is supplied in Tray packaging. Confirm packaging requirements with your procurement specifications.

Q: What is the contact finish specification for both parts?

A: Both parts feature Gold or Gold GXT™ contact finish at 30.0µin (0.76µm) thickness, ensuring equivalent electrical performance and reliability.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -20°C to 105°C, meeting identical thermal specifications.

Q: What is the moisture sensitivity level for these connectors?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.