Amphenol ICC 51940-139 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51940-139 is a 31-position receptacle connector featuring female sockets and blade sockets for through-hole PCB mounting in blade power applications. This connector is part of the PwrBlade® series and provides a combination of 20 signal and 11 power contacts with board lock and guide pin features.

The 51940-139 is classified as obsolete product status. Identifying equivalent and 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

51940-139

Amphenol ICC (FCI)In Stock: 85851940-139 Datasheet

Current PartRFQ

51940-139LF

Amphenol ICC (FCI)In Stock: 78051940-139LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 51940-139 is determined by strict equivalence across the following critical parameters:

• Connector type: Receptacle with female sockets and blade sockets
• Number of positions: 31
• Pitch: 0.100" (2.54mm)
• Number of rows: 4
• Contact layout: 20 signal, 11 power
• Mounting type: Through hole
• Termination method: Solder
• Contact finish: Gold or Gold, GXT™
• Contact finish thickness: 30.0µin (0.76µm)
• Color: Black
• Material flammability rating: UL94 V-0
• Operating temperature range: -20°C ~ 105°C
• Moisture sensitivity level: 1 (Unlimited)

The 51940-139LF meets all these criteria and qualifies as a direct substitute. The primary distinction between these parts is product status and compliance certification, not electrical or mechanical function.

Parameter Comparison

Engineering Selection Recommendations

The 51940-139LF is the direct substitute for the 51940-139. Both connectors are electrically and mechanically identical across all specified parameters. The 51940-139LF offers the following advantages:

• Active product status ensures ongoing availability and manufacturer support
• RoHS compliance satisfies regulatory requirements for new designs and production
• REACH compliance status is documented for the 51940-139LF
• Tray packaging provides standardized handling and inventory management

Selection of the 51940-139LF is appropriate for applications requiring compliance with current environmental and regulatory standards while maintaining full functional and mechanical compatibility with existing 51940-139 designs.

Frequently Asked Questions (FAQ)

Q: Are the 51940-139 and 51940-139LF electrically interchangeable?

A: Yes. Both connectors share identical electrical specifications including contact layout (20 signal, 11 power), contact finish (Gold or Gold, GXT™), operating temperature range (-20°C ~ 105°C), and material flammability rating (UL94 V-0).

Q: Are the 51940-139 and 51940-139LF mechanically interchangeable?

A: Yes. Both connectors have identical mechanical specifications: 31 positions, 0.100" (2.54mm) pitch, 4 rows, through-hole mounting, solder termination, and black color. Board lock and guide pin features are present on both parts.

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

A: The primary differences are product status, RoHS compliance, and packaging. The 51940-139 is obsolete and RoHS non-compliant, while the 51940-139LF is active, RoHS compliant, and REACH affected. The 51940-139LF is supplied in tray packaging.

Q: Can I use the 51940-139LF as a replacement in existing designs using the 51940-139?

A: Yes. The 51940-139LF provides full functional and mechanical compatibility with the 51940-139 and is suitable for direct substitution in PCB designs and assemblies.

Q: What does the "LF" suffix indicate?

A: The "LF" suffix indicates lead-free termination and RoHS compliance. This designation reflects the connector's compliance with environmental and regulatory standards.

Q: Are there any compatibility considerations for packaging?

A: The 51940-139LF is supplied in tray packaging, which is standard for active production parts. If the original 51940-139 packaging specification is critical to your supply chain process, this should be evaluated during component qualification.