L77DFBH25S1APN: Equivalent & Substitute Parts

Part Overview

The L77DFBH25S1APN is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC, designed for right-angle solder termination with panel mount and through-hole configurations. This connector is classified as Active and is RoHS compliant, supporting applications requiring signal transmission at voltages up to 300V with a maximum current rating of 7.5A across an operating temperature range of -55°C to 125°C. Substitute parts become necessary when sourcing constraints, manufacturing obsolescence, or design revisions require alternative connectors that maintain functional and electrical compatibility within established tolerance parameters.

Substiute Parts

L77DFBH25S1APN

Amphenol ICC (Commercial Products)In Stock: 1094L77DFBH25S1APN Datasheet

Current PartRFQ

173-E25-213R001

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

SimilarRFQ

174-E25-211R001

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

SimilarRFQ

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 compatibility for the L77DFBH25S1APN is determined by alignment across these critical parameters:

Mandatory Matching Parameters:

• 25 positions in 2-row configuration
• D-Sub shell size 3 (DB, B) layout
• Receptacle type with female sockets
• Right-angle mounting orientation
• Solder termination method

Allowed Parameter Variations:

• Shell material finish (tin plated, nickel plated, chromate plated)
• Contact finish thickness (specified versus flash plating)
• Current rating (minimum 5A; 7.5A preferred)
• Voltage rating (300V preferred; unmarked acceptable where not specified as constraint)
• Operating temperature range (minimum -50°C to 100°C; -55°C to 125°C preferred)
• Flange feature configuration (board side, housing/shell, mating side variations)
• RoHS compliance status (RoHS3 compliant, RoHS non-compliant acceptable for legacy designs)

The substitute parts listed meet the core electrical and mechanical requirements while permitting material and finish variations that do not affect functional interchangeability in standard D-Sub applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 173-E25-213R001 (NorComp Inc.)

The 173-E25-213R001 is the preferred substitute due to active product status and ROHS3 compliance, meeting modern regulatory requirements. This part maintains D-Sub 25-position, 2-row configuration with female sockets and right-angle solder termination. The operating temperature range (-55°C to 125°C) aligns with the primary part. The 5A current rating is suitable for signal applications where the 7.5A rating of the L77DFBH25S1APN is not required. Nickel plating on steel provides equivalent corrosion resistance to tin plating. Flash gold contact finish meets standard D-Sub contact interface requirements.

Secondary Alternatives: 174-E25-211R001, 174-E25-211R141, 174-E25-211R241 (NorComp Inc.)

These three NorComp parts share the 174-E series base design and are electrically compatible but carry Obsolete product status and RoHS non-compliant classification. Use of these parts is appropriate only in legacy design revisions, retrofit applications, or where regulatory compliance requirements do not apply. Operating temperature is limited to -50°C to 100°C, reducing applicability in extended temperature environments. Current rating remains 5A across all three variants. Differences among the three variants are flange feature configurations (housing/shell unthreaded versus mating side screwlock or standard screws), which do not affect electrical function but influence mechanical mounting interface.

Design Constraint Assessment:

Applications requiring the full 7.5A current rating or extended voltage specification (300V) cannot migrate to substitute parts with 5A ratings or unspecified voltage. The backset spacing variation across parts (0.283" to 0.406") requires PCB layout verification to confirm through-hole alignment compatibility. Flange feature differences necessitate mechanical design review to confirm mounting bracket and panel interface compatibility.

Frequently Asked Questions (FAQ)

Q: Can 173-E25-213R001 replace L77DFBH25S1APN directly on a PCB?

A: Electrical compatibility is confirmed across all 25 signal positions and solder termination. However, backset spacing differs (0.283" versus 0.406"), which affects PCB through-hole placement. Mechanical mounting interfaces differ due to flange feature configuration (housing/shell unthreaded versus board side). PCB layout verification is required before installation.

Q: Are the obsolete NorComp 174-E25-211R series parts acceptable for new designs?

A: The 174-E25-211R series parts (211R001, 211R141, 211R241) are obsolete and RoHS non-compliant. For new product designs subject to modern regulatory requirements, the active and ROHS3-compliant 173-E25-213R001 is the appropriate selection. Obsolete parts are limited to legacy system support and retrofit applications where regulatory exemption applies.

Q: Why do substitute parts specify 5A rating versus the 7.5A rating of the primary part?

A: Current rating is determined by contact cross-section, material composition, and contact finish specification. The NorComp substitute parts are rated for 5A based on their contact design. For applications requiring sustained currents above 5A, the L77DFBH25S1APN 7.5A rating provides additional margin. Applications with signal-level currents below 5A experience no functional impact from this rating difference.

Q: What is the difference between flash gold contact finish and 20.0µin (0.51µm) plating?

A: Flash gold finish applies a minimal thickness gold layer for contact protection and wetting properties. The L77DFBH25S1APN specifies 20.0µin (0.51µm), which represents a defined thickness plating for extended contact life in high-cycle mating environments. Both finishes provide equivalent electrical contact properties for standard D-Sub applications. Higher plating thickness becomes relevant only in high-insertion-count or high-reliability specifications.

Q: Can I use 174-E25-211R141 or 174-E25-211R241 as direct replacements for 173-E25-213R001?

A: Electrical compatibility exists across all three NorComp parts (173-E25-213R001, 174-E25-211R001, 174-E25-211R141, 174-E25-211R241). All maintain 25 positions, 2-row D-Sub configuration, and 5A current rating. Differences are mechanical flange features and backset spacing. Selection among these parts depends on mechanical mounting interface requirements and product status applicability (active versus obsolete).

Q: Are there temperature limitations when substituting with 174-E25-211R parts?

A: Yes. The 174-E25-211R series parts operate within -50°C to 100°C range, which is more restricted than the L77DFBH25S1APN and 173-E25-213R001 specifications of -55°C to 125°C. Applications requiring operation below -50°C or above 100°C must use the primary part or 173-E25-213R001. Verify operating environment temperature specifications before selecting 174-E25-211R variants.