Amphenol ICC 51939-261 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51939-261 is a 36-position blade power connector header designed for board edge, through-hole, right-angle mounting applications. This connector features male pins and blades with a 0.100" (2.54mm) pitch, configured with 24 signal and 12 power contacts in a 4-row layout. The part is classified as obsolete, making identification of active equivalent components essential for ongoing production and maintenance applications.

Substiute Parts

51939-261

Amphenol ICC (FCI)In Stock: 110351939-261 Datasheet

Current PartRFQ

51939-261LF

Amphenol ICC (FCI)In Stock: 121151939-261LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 51939-261 is determined by strict equivalence across the following critical parameters:

• Connector Type & Style: Header with male pins and blades, blade power configuration
• Position Count & Layout: 36 total positions with 24 signal and 12 power contacts
• Pitch & Row Configuration: 0.100" (2.54mm) pitch in 4-row arrangement
• Mounting & Termination: Board edge, through-hole, right-angle mounting with solder termination
• Contact Specifications: Gold or Gold GXT™ finish with 30.0µin (0.76µm) thickness
• Environmental Ratings: UL94 V-0 flammability and -20°C ~ 105°C operating temperature

The substitute part 51939-261LF maintains identical electrical and mechanical specifications while offering improved compliance status and active product availability.

Parameter Comparison

Engineering Selection Recommendations

The 51939-261LF serves as the direct functional equivalent to the obsolete 51939-261. Both parts maintain identical electrical and mechanical specifications across all critical parameters including connector type, position count, pitch, mounting configuration, and contact specifications.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The 51939-261LF is an active product with RoHS compliance and REACH applicability, whereas the 51939-261 is obsolete and RoHS non-compliant. For new designs and ongoing production requiring compliance with current environmental regulations, the 51939-261LF is the appropriate selection. The tray packaging of the 51939-261LF supports standard manufacturing and distribution workflows.

Frequently Asked Questions (FAQ)

Q: Are the 51939-261 and 51939-261LF mechanically interchangeable?

A: Yes. Both parts share identical connector type, position count (36), pitch (0.100"), row configuration (4 rows), mounting style (board edge, through-hole, right-angle), and contact specifications. They are direct mechanical equivalents.

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

A: The primary differences are product status and compliance. The 51939-261LF is an active product with RoHS compliance, while the 51939-261 is obsolete and RoHS non-compliant. The 51939-261LF is supplied in tray packaging.

Q: Can I use 51939-261LF as a replacement for 51939-261 in existing designs?

A: Yes. The 51939-261LF maintains full electrical and mechanical compatibility with the 51939-261 across all specified parameters. The connector type, blade power configuration, contact layout (24 signal, 12 power), and environmental ratings are identical.

Q: What does the "LF" suffix indicate?

A: The "LF" suffix typically indicates lead-free or compliance-related variants. In this case, the 51939-261LF is RoHS compliant, whereas the base 51939-261 is not.

Q: Are there any packaging differences I should consider?

A: The 51939-261LF is supplied in tray packaging, which is standard for production environments. Packaging specifications for the 51939-261 were not provided in the technical data.

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

A: Both parts feature gold or gold GXT™ contact finish with a thickness of 30.0µin (0.76µm), ensuring consistent electrical performance and reliability.