Amphenol ICC 51939-074 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51939-074 is a 35-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 contacts and 11 power contacts across 4 rows. The connector incorporates board lock and mating guide features for secure assembly.

The 51939-074 carries an obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this connector.

Substiute Parts

51939-074

Amphenol ICC (FCI)In Stock: 73251939-074 Datasheet

Current PartRFQ

51939-074LF

Amphenol ICC (FCI)In Stock: 111251939-074LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 51939-074 is determined by strict equivalence across the following critical parameters:

• Connector type and style (Header, Male Pins and Blades; Blade Power)
• Number of positions and contact layout (35 positions; 24 Signal, 11 Power)
• Pitch and row configuration (0.100" / 2.54mm; 4 rows)
• Mounting type and termination method (Board Edge, Through Hole, Right Angle; Solder)
• Contact finish specification (Gold or Gold, GXT™; 30.0µin thickness)
• Physical characteristics (Black color; UL94 V-0 flammability rating)
• Operating temperature range (-20°C ~ 105°C)
• Moisture sensitivity level (MSL 1)

The substitute part 51939-074LF meets all these criteria and is therefore electrically and mechanically equivalent to the main part number.

Parameter Comparison

Engineering Selection Recommendations

The 51939-074LF is the direct equivalent substitute for the obsolete 51939-074. Both parts are electrically and mechanically identical across all specified parameters, including connector configuration, contact layout, pitch, mounting type, and operating characteristics.

The primary distinction between the two parts is product status and compliance posture. The 51939-074LF carries active product status and RoHS compliance certification, whereas the 51939-074 is obsolete and RoHS non-compliant. The 51939-074LF is additionally REACH-affected.

For new designs or ongoing production requiring this connector type, the 51939-074LF is the appropriate selection. The substitute part maintains full electrical and mechanical compatibility while providing access to current manufacturing and compliance support.

Frequently Asked Questions (FAQ)

Q: Are the 51939-074 and 51939-074LF mechanically interchangeable?

A: Yes. Both parts share identical mechanical specifications: 35 positions, 0.100" pitch, 4-row configuration, board edge through-hole right-angle mounting, and black color. Physical dimensions and mounting footprints are equivalent.

Q: Are the 51939-074 and 51939-074LF electrically interchangeable?

A: Yes. Both parts feature identical electrical specifications: 24 signal contacts and 11 power contacts, gold contact finish at 30.0µin thickness, UL94 V-0 flammability rating, and -20°C to 105°C operating temperature range.

Q: What is the difference between the 51939-074 and 51939-074LF?

A: The primary differences are product status, RoHS compliance, and packaging. The 51939-074 is obsolete and RoHS non-compliant. The 51939-074LF is active, RoHS compliant, REACH-affected, and supplied in tray packaging.

Q: Can I use the 51939-074LF as a direct replacement for the 51939-074 in existing assemblies?

A: Yes. The 51939-074LF is a direct equivalent substitute. No design modifications or re-qualification are required due to the identical electrical and mechanical specifications.

Q: What packaging is available for the 51939-074LF?

A: The 51939-074LF is supplied in tray packaging.

Q: Are there any compliance differences between these parts?

A: Yes. The 51939-074LF is RoHS compliant and REACH-affected, whereas the 51939-074 is RoHS non-compliant. For applications subject to RoHS or REACH regulations, the 51939-074LF is the required selection.