L77DFB25S1APN D-Sub 25 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L77DFB25S1APN is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets, right-angle solder termination, and panel mount through-hole mounting. The part is currently active in production status with 834 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements change, or when alternative sourcing is required to meet project timelines and cost objectives. The substitute parts listed maintain functional compatibility within the D-Sub 25 position receptacle category while accommodating variations in mechanical and electrical specifications.

Substiute Parts

L77DFB25S1APN

Amphenol ICC (Commercial Products)In Stock: 877L77DFB25S1APN 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

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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 logic for the L77DFB25S1APN is based on the following critical parameters that must align across equivalent parts:

Core Compatibility Parameters:

• Connector style: D-Sub
• Connector type: Receptacle, Female Sockets
• Number of positions: 25
• Number of rows: 2
• Shell size/layout: 3 (DB, B)
• Termination method: Solder
• Mounting configuration: Right Angle

Electrical Performance Parameters:

• Current rating: 5A minimum (L77DFB25S1APN rated 7.5A)
• Voltage rating: 300V minimum (where specified)
• Operating temperature range: -55°C to 125°C minimum

Compliance Parameters:

• Material flammability: UL94 V-0
• RoHS compliance status
• REACH compliance status

The substitute parts listed (173-E25-213R001, 174-E25-211R001, 174-E25-211R141, 174-E25-211R241) maintain the core D-Sub 25 position receptacle configuration. Variations exist in shell material finish, contact material composition, backset spacing, and product status. These variations are documented in the parameter comparison table to enable informed selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

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

The 173-E25-213R001 is the recommended active substitute for the L77DFB25S1APN. This part maintains active product status, ensuring continued availability and manufacturer support. It is ROHS3 compliant, exceeding the RoHS compliance requirement of the main part. The connector shares identical core specifications: 25 position D-Sub receptacle, female sockets, right-angle solder termination, and UL94 V-0 flammability rating. Operating temperature range matches the main part (-55°C to 125°C). Current rating of 5A is lower than the main part's 7.5A specification; applications requiring the full 7.5A rating must evaluate this reduction. Backset spacing differs (0.283" versus 0.406"), requiring mechanical layout verification. Shell material finish (nickel plated) differs from the main part (tin plated), which may affect corrosion resistance in specific environments.

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

These three parts are classified as obsolete products. Selection of obsolete parts is appropriate only when existing inventory is available and no active alternatives meet application requirements. All three parts share identical core D-Sub 25 position receptacle specifications with the main part. Current rating is 5A (lower than main part's 7.5A). Operating temperature range is reduced (-50°C to 100°C versus -55°C to 125°C). RoHS non-compliance status requires evaluation against project regulatory requirements. Shell material finish is yellow chromate plated, differing from the main part's tin plated finish. Contact material is brass rather than copper alloy.

Flange Feature Variations:

• 174-E25-211R001: Unthreaded housing/shell (matches main part configuration)
• 174-E25-211R141: Mating side, female screwlock (4-40)
• 174-E25-211R241: Mating side, standard screws (4-40)

Selection between these three obsolete variants depends on specific mating interface requirements.

Compliance Considerations:

Applications subject to RoHS regulations must use 173-E25-213R001 (ROHS3 compliant) or the main part L77DFB25S1APN (RoHS compliant). The three NorComp 174-E series parts are RoHS non-compliant and unsuitable for regulated applications.

Electrical Performance Considerations:

The main part L77DFB25S1APN is rated for 7.5A and 300V. All substitute parts are rated for 5A maximum current. Applications requiring current capacity above 5A cannot use these substitutes. Voltage rating is not specified for the NorComp substitute parts; applications requiring 300V rating confirmation should verify with the manufacturer.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 be used as a direct replacement for the L77DFB25S1APN?

A: The 173-E25-213R001 is functionally compatible as a 25 position D-Sub receptacle with female sockets and solder termination. However, three factors require evaluation: (1) Current rating is reduced from 7.5A to 5A; (2) Backset spacing differs (0.283" versus 0.406"), requiring mechanical layout verification; (3) Shell material finish differs (nickel plated versus tin plated), which may affect corrosion resistance in specific environments. Direct replacement is possible only when these differences are acceptable for the application.

Q: Why are the NorComp 174-E series parts listed as obsolete?

A: Product status is provided by the manufacturer. Obsolete designation indicates the manufacturer has discontinued active production and support. These parts remain available through existing inventory channels but are not recommended for new designs. Obsolete parts should be selected only when active alternatives are unavailable or when existing inventory must be utilized.

Q: What is the significance of backset spacing differences?

A: Backset spacing is the distance from the rear of the connector shell to the solder cup termination points. The main part specifies 0.406" (10.30mm), while the 173-E25-213R001 specifies 0.283" (7.20mm). This difference affects PCB layout and component placement. Connectors with different backset spacing cannot be used interchangeably on the same PCB without redesign.

Q: Are the NorComp 174-E series parts suitable for RoHS-regulated applications?

A: No. The 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 are all marked as RoHS non-compliant. These parts are unsuitable for applications subject to RoHS regulations. Only the 173-E25-213R001 (ROHS3 compliant) or the main part L77DFB25S1APN (RoHS compliant) meet RoHS requirements.

Q: What is the difference between the three NorComp 174-E variants?

A: All three parts (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) share identical electrical and core mechanical specifications. The difference lies in the flange feature: 174-E25-211R001 has an unthreaded housing/shell; 174-E25-211R141 has a mating side female screwlock (4-40); 174-E25-211R241 has mating side standard screws (4-40). Selection depends on the specific mating interface and locking mechanism required.

Q: Can I use a substitute part with a lower current rating in my application?

A: Current rating substitution depends on actual circuit requirements. If your application draws 5A or less, a substitute part rated for 5A is acceptable. If your application requires current capacity above 5A, substitute parts rated for 5A cannot be used. Verify actual circuit current draw before selecting a substitute with reduced current rating.

Q: What does "flash" contact finish thickness mean compared to 20.0µin?

A: Flash plating is a minimal thickness coating applied to contact surfaces, typically less than 1 microinch. The main part specifies 20.0µin (0.51µm) gold plating, which is substantially thicker. Flash plating provides basic corrosion protection but offers less wear resistance and durability than thicker plating. Applications requiring extended contact life or high-cycle mating should consider this difference.

Q: Are there any temperature range limitations when substituting parts?

A: The main part operates from -55°C to 125°C. The 173-E25-213R001 matches this range. The three NorComp 174-E series parts operate from -50°C to 100°C, which is narrower. If your application requires operation below -50°C or above 100°C, the 174-E series parts are unsuitable. The 173-E25-213R001 or main part must be used.

Q: What is the difference between tin plated and nickel plated shell finishes?

A: Tin plating (main part) provides good solderability and corrosion resistance in most environments. Nickel plating (173-E25-213R001) provides superior corrosion resistance, particularly in harsh or high-humidity environments, but may require different handling during assembly. The choice depends on environmental exposure and assembly process requirements.