L77DFB25S1AMNVF2 Equivalent & Substitute Parts

Part Overview

The L77DFB25S1AMNVF2 is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets in a right-angle, panel-mount configuration with solder termination and is currently in active product status. The connector utilizes tin-plated steel construction with gold-plated contacts and meets UL94 V-0 flammability requirements.

Alternative equivalent parts are necessary when the primary model becomes unavailable due to supply constraints, obsolescence, or when design flexibility permits selection from qualified substitute manufacturers such as NorComp Inc. The substitute parts listed below maintain functional compatibility through matching electrical and mechanical parameters within acceptable tolerance ranges.

Substiute Parts

L77DFB25S1AMNVF2

Amphenol ICC (Commercial Products)In Stock: 982L77DFB25S1AMNVF2 Datasheet

Current PartRFQ

173-E25-213R001

NorComp Inc.In Stock: 1275173-E25-213R001 Datasheet

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174-E25-211R001

NorComp Inc.In Stock: 1217174-E25-211R001 Datasheet

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174-E25-211R141

NorComp Inc.In Stock: 1041174-E25-211R141 Datasheet

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174-E25-211R241

NorComp Inc.In Stock: 1127174-E25-211R241 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of D-Sub receptacle connectors is governed by strict compatibility criteria. The following parameters must be matched or exceeded to ensure functional interchangeability:

Critical Parameters for Substitution:

• Connector style (D-Sub receptacle, female sockets)
• Number of positions and row configuration (25 positions, 2 rows)
• Shell size (Size 3 / DB, B layout)
• Mounting type (Right angle configuration)
• Contact type (Signal contacts)
• Termination method (Solder)

Tolerant Parameters (May Vary Within Design Specification):

• Current rating (minimum 5A acceptable for most applications)
• Voltage rating (provided rating meets or exceeds circuit requirements)
• Operating temperature range (extended range acceptable)
• Contact finish material and thickness
• Shell material and plating (different platings acceptable if corrosion resistance maintained)
• Backset spacing (minor variations within mechanical envelope)
• Flange feature configuration (mating side vs. housing/shell differences acceptable based on application)

The four NorComp equivalent models (173-E25-213R001, 174-E25-211R001, 174-E25-211R141, 174-E25-211R241) meet the critical substitution criteria while showing variations in secondary parameters that do not prevent functional interchange in standard applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection - L77DFB25S1AMNVF2 (Amphenol ICC): This connector is the recommended primary choice for new designs. It carries active product status, full RoHS compliance, and the highest current rating (7.5A) among all options. It provides specified voltage rating (300V) and extended operating temperature range (-55°C ~ 125°C). The tin-plated steel shell and 20.0µin gold contact finish provide superior corrosion protection and long-term reliability.

Active Equivalent - 173-E25-213R001 (NorComp Inc.): This substitute is suitable for applications where the primary part is unavailable. It maintains active product status and achieves ROHS3 compliance. The 5A current rating is acceptable for lower-current applications. The nickel-plated steel shell and shorter backset spacing (7.20mm) present mechanical differences that require PCB layout validation. Select this option when the Amphenol part is unavailable and the application current requirements do not exceed 5A.

Obsolete Equivalents - 174-E25-211R001, 174-E25-211R141, 174-E25-211R241 (NorComp Inc.): These three parts are marked as obsolete and carry non-compliant RoHS status. They are acceptable only for legacy equipment support or repair applications where replacement with obsolete-compatible components is necessary. The yellow chromate plating and brass contact material differ from the primary specification. The reduced operating temperature range (-50°C ~ 100°C) and lower current rating (5A) may limit application scope. None of these three parts should be selected for new designs.

Frequently Asked Questions (FAQ)

Q: What are the critical compatibility requirements for D-Sub 25-position receptacle substitution?

A: The connector must be a D-Sub receptacle with 25 positions in a 2-row configuration, Size 3 (DB, B) shell, right-angle mounting, solder termination, and female socket contacts. The flange feature configuration may vary between mating side and housing/shell mounting without affecting functional compatibility in standard applications.

Q: Can I use 174-E25-211R001, 174-E25-211R141, or 174-E25-211R241 in a new design?

A: No. These parts are obsolete and RoHS non-compliant. They are restricted to legacy equipment support and repair applications only. For new designs, use L77DFB25S1AMNVF2 or 173-E25-213R001.

Q: What is the impact of different backset spacing values?

A: Backset spacing affects the connector's profile when mounted on a PCB. The L77DFB25S1AMNVF2 has 0.406" (10.30mm) spacing, while 173-E25-213R001 has 0.283" (7.20mm) and the 174-E series parts have 0.370" (9.40mm). Verify PCB layout and mechanical envelope constraints before substitution.

Q: Why do the substitute parts show different current ratings?

A: The Amphenol L77DFB25S1AMNVF2 is rated for 7.5A, while all NorComp equivalents are rated for 5A. Current rating is determined by contact design, contact material, and plating thickness. Verify that your application current requirements do not exceed 5A when using NorComp substitutes.

Q: Are the voltage ratings equivalent across all parts?

A: The L77DFB25S1AMNVF2 specifies 300V. The NorComp substitute parts do not provide explicit voltage rating specifications in the available documentation. For applications requiring explicit voltage ratings, the Amphenol part is the preferred choice.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: Both statuses indicate compliance with the Restriction of Hazardous Substances directive. ROHS3 refers to the most recent directive revision. Both L77DFB25S1AMNVF2 (RoHS Compliant) and 173-E25-213R001 (ROHS3 Compliant) meet current regulatory requirements. The 174-E series parts are RoHS non-compliant and cannot be used in applications subject to RoHS regulations.

Q: Can I substitute any of these parts interchangeably?

A: Not all substitutions are equivalent. The active parts (L77DFB25S1AMNVF2 and 173-E25-213R001) can serve as substitutes for each other when application current and voltage requirements are verified. The obsolete NorComp parts (174-E series) are restricted to legacy applications. Always verify current rating, voltage rating, operating temperature range, and mechanical envelope compatibility before substitution.