Amphenol ICC 51939-137 Backplane Connector Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51939-137 is a 31-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 contact layout of 24 signal and 7 power positions. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing system support and new design implementations.

Substiute Parts

51939-137

Amphenol ICC (FCI)In Stock: 83751939-137 Datasheet

Current PartRFQ

51939-137LF

Amphenol ICC (FCI)In Stock: 76951939-137LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 51939-137 is determined by strict equivalence across the following critical parameters:

• Connector type and style (Header, Male Pins and Blades; Blade Power)
• Number of positions (31) and contact layout (24 Signal, 7 Power)
• Pitch specification (0.100" / 2.54mm)
• Mounting configuration (Board Edge, Through Hole, Right Angle)
• Number of rows (4)
• Termination method (Solder)
• Contact finish specification (Gold or Gold, GXT™) and thickness (30.0µin)
• Material flammability rating (UL94 V-0)
• Operating temperature range (-20°C ~ 105°C)
• Moisture sensitivity level (MSL 1)

The primary distinction between the main part and its substitute relates to product status and RoHS compliance, not electrical or mechanical function.

Parameter Comparison

Engineering Selection Recommendations

The 51939-137LF serves as the direct substitute for the obsolete 51939-137. Both parts are electrically and mechanically identical across all specified parameters. The 51939-137LF maintains active product status with Amphenol ICC (FCI), ensuring continued availability and supply chain reliability.

The 51939-137LF achieves RoHS compliance, whereas the original 51939-137 does not. For applications subject to RoHS regulatory requirements or environmental compliance mandates, the 51939-137LF is the appropriate selection. For legacy systems where RoHS compliance is not a requirement, both parts remain functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 51939-137LF be used as a direct replacement for the 51939-137?

A: Yes. The 51939-137LF is electrically and mechanically identical to the 51939-137 across all specified parameters, including connector type, position count, pitch, mounting configuration, contact finish, and operating temperature range.

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

A: The 51939-137LF is RoHS compliant and maintains active product status, while the 51939-137 is obsolete and RoHS non-compliant. No functional or electrical differences exist between the parts.

Q: Are there packaging differences between the 51939-137 and 51939-137LF?

A: The 51939-137LF is supplied in Tray packaging. Packaging information for the 51939-137 was not provided in the specification data.

Q: Does the RoHS compliance of the 51939-137LF affect its electrical performance?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical or mechanical performance. Both parts operate identically within the specified -20°C ~ 105°C temperature range.

Q: What is the contact layout for these connectors?

A: Both connectors feature 24 signal positions and 7 power positions within the 31-position configuration.