Amphenol ICC 51939-375 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51939-375 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, organized in 4 rows with a typical contact layout of 24 signal and 12 power contacts. The connector is part of the PwrBlade® series and utilizes gold or gold GXT™ contact finish.

The 51939-375 is currently classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this connector specification.

Substiute Parts

51939-375

Amphenol ICC (FCI)In Stock: 99451939-375 Datasheet

Current PartRFQ

51939-375LF

Amphenol ICC (FCI)In Stock: 102451939-375LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 51939-375 is determined by strict equivalence across the following critical parameters:

• Connector type and style (Header, Male Pins and Blades; Blade Power)
• Number of positions (36)
• Pitch specification (0.100" / 2.54mm)
• Number of rows (4)
• Mounting configuration (Board Edge, Through Hole, Right Angle)
• Contact layout (24 Signal, 12 Power)
• Contact finish specification (Gold or Gold, GXT™)
• Contact finish thickness (30.0µin / 0.76µm)
• Color (Black)
• Flammability rating (UL94 V-0)
• Operating temperature range (-20°C ~ 105°C)
• Termination method (Solder)

The substitute part 51939-375LF meets all these parameters identically, establishing it as a direct functional equivalent. The primary distinction between the main part and its substitute is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The 51939-375LF is the direct substitute for the obsolete 51939-375. Both connectors are electrically and mechanically identical across all specified parameters. The 51939-375LF offers the following advantages:

• Active product status ensures ongoing availability and manufacturer support
• RoHS compliance certification meets current regulatory requirements
• REACH affected status indicates compliance with chemical substance regulations
• Tray packaging provides standardized handling and storage

For new designs or component replenishment, the 51939-375LF is the appropriate selection. For legacy systems currently using the 51939-375, the 51939-375LF provides direct compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the 51939-375LF be used as a direct replacement for the 51939-375?

A: Yes. The 51939-375LF is electrically and mechanically equivalent to the 51939-375 across all specified parameters, including connector type, position count, pitch, mounting configuration, contact layout, finish specification, and operating temperature range.

Q: What is the primary difference between these two parts?

A: The 51939-375 is obsolete, while the 51939-375LF is an active product. The 51939-375LF also carries RoHS compliance certification, whereas the 51939-375 is RoHS non-compliant. Both parts are functionally identical.

Q: Are there packaging differences between the two parts?

A: The 51939-375LF is supplied in tray packaging. The packaging specification for the 51939-375 was not provided in the technical documentation.

Q: What does the "LF" designation in 51939-375LF indicate?

A: The "LF" suffix typically indicates lead-free composition, which aligns with the RoHS compliance status of the 51939-375LF.

Q: Can these connectors be used interchangeably in existing assemblies?

A: Yes. The 51939-375LF maintains identical electrical and mechanical specifications, allowing direct substitution in applications currently using the 51939-375.

Q: What is the contact layout for this connector?

A: The connector features 24 signal contacts and 12 power contacts distributed across 36 total positions in a 4-row configuration.