Amphenol ICC 51940-191 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51940-191 is a 33-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 contact layout of 24 signal and 9 power positions with gold-plated contacts rated for -20°C to 105°C operation.

The 51940-191 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance where this connector type remains in use.

Substiute Parts

51940-191

Amphenol ICC (FCI)In Stock: 72451940-191 Datasheet

Current PartRFQ

51940-191LF

Amphenol ICC (FCI)In Stock: 103351940-191LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 51940-191 is determined by strict equivalence across the following critical parameters:

• Connector type: Receptacle with female sockets and blade sockets
• Position count: 33 positions
• Pitch: 0.100" (2.54mm)
• Row configuration: 4 rows
• Mounting method: Through hole
• Termination style: Press-fit and solder capable
• Contact layout: 24 signal, 9 power positions
• Contact finish: Gold or Gold, GXT™ at 30.0µin thickness
• Flammability rating: UL94 V-0
• Temperature range: -20°C to 105°C

The 51940-191LF 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 51940-191LF is the direct substitute for the obsolete 51940-191. Both parts are electrically and mechanically identical across all functional parameters. The 51940-191LF offers the following advantages for new designs and ongoing production:

• Active product status ensures continued availability and manufacturer support
• RoHS compliance meets current environmental and regulatory requirements
• Tray packaging provides improved handling and inventory management compared to bulk packaging
• REACH compliance status documented for supply chain transparency

For legacy systems currently using the 51940-191, the 51940-191LF provides seamless compatibility without design modification. The connector footprint, pin assignment, electrical characteristics, and thermal performance remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can the 51940-191LF be used as a direct replacement for the 51940-191 in existing designs?

A: Yes. The 51940-191LF is mechanically and electrically identical to the 51940-191. PCB footprints, mating interfaces, and electrical performance are unchanged. The primary differences are product status and compliance certifications.

Q: What is the significance of the "LF" suffix in the 51940-191LF part number?

A: The "LF" designation indicates lead-free and RoHS-compliant construction. This part meets current environmental regulations and is suitable for applications requiring RoHS compliance.

Q: Are there packaging differences between these parts?

A: Yes. The 51940-191 is supplied in bulk packaging, while the 51940-191LF is supplied in tray packaging. Tray packaging provides better protection during storage and handling but does not affect connector performance or compatibility.

Q: What contact layout does this connector support?

A: Both parts support a 24 signal and 9 power contact layout within the 33-position configuration. This layout is fixed and identical between the two part numbers.

Q: Is the operating temperature range the same for both parts?

A: Yes. Both the 51940-191 and 51940-191LF operate across the same temperature range of -20°C to 105°C with identical contact finish specifications and flammability ratings.