L77DFB25SAJ4RM6VF

Part Overview

The L77DFB25SAJ4RM6VF is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC with female sockets, right-angle solder termination, and panel-mount through-hole configuration. This connector is currently active in production and widely used in applications requiring robust signal distribution with a 7.5A current rating and 300V voltage capability. Alternative equivalent and substitute parts become necessary due to supply chain considerations, design changes in equipment revisions, or procurement preference for alternative manufacturers maintaining equivalent electrical and mechanical specifications.

Substiute Parts

L77DFB25SAJ4RM6VF

Amphenol ICC (Commercial Products)In Stock: 821L77DFB25SAJ4RM6VF 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

SimilarRFQ

174-E25-211R241

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the L77DFB25SAJ4RM6VF is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

• Connector type and style: D-Sub receptacle with female sockets
• Number of positions and rows: 25 positions, 2 rows (Size 3 / DB, B layout)
• Mounting configuration: Through-hole, right-angle orientation
• Termination method: Solder
• Contact form: Machined
• Flange feature: Mating side female screwlock (4-40)
• Material flammability: UL94 V-0

Performance Parameters Affecting Substitution:

• Current rating requirement: 7.5A (minimum acceptable)
• Voltage rating: 300V (minimum acceptable)
• Operating temperature range: -55°C to 125°C (minimum acceptable)
• Shell finish and contact finish specifications
• Backset spacing for PCB layout compatibility
• RoHS and regulatory compliance status

The identified substitute parts (173-E25-213R001, 174-E25-211R001, 174-E25-211R141, 174-E25-211R241) are functionally equivalent D-Sub 25-position receptacles from NorComp Inc. with identical connector topology. Substitution eligibility varies based on electrical current/voltage tolerance, operating temperature range, regulatory compliance status, and specific flange configurations, as detailed in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

Primary Equivalent (Active Status with Compliance): 173-E25-213R001 from NorComp Inc. is the recommended primary substitute for new designs and active production. This part maintains active product status, ROHS3 compliance, and full operating temperature compatibility (-55°C to 125°C). It features identical connector topology and identical socket count. The primary design limitation is a reduced current rating (5A versus 7.5A) and different backset spacing (0.283" versus 0.319"), which require verification against specific board layout and circuit current requirements. The unthreaded flange differs from the female screwlock configuration of the main part.

Secondary Alternatives (Obsolete Status / Limited Compliance): 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 are obsolete NorComp offerings with RoHS non-compliance status and reduced operating temperature range (-50°C to 100°C). These parts exhibit a 5A current rating and 0.370" (9.40mm) backset spacing, creating PCB layout incompatibility with designs using the main part's 0.319" spacing. 174-E25-211R141 and 174-E25-211R241 feature mating-side screwlock configurations compatible with the main part's flange mechanical interface, though their obsolete status limits procurement viability.

Compliance Considerations: Equipment targeted for RoHS-regulated markets and REACH compliance must use either the main part L77DFB25SAJ4RM6VF or the substitute 173-E25-213R001. The NorComp 174-E25 series parts are unsuitable for compliant applications.

Frequently Asked Questions (FAQ)

Q: Can 173-E25-213R001 directly replace L77DFB25SAJ4RM6VF in all applications? A: The 173-E25-213R001 functions as a D-Sub 25-position receptacle with identical connector topology and socket arrangement. Substitution eligibility depends on specific application requirements. The reduced current rating (5A versus 7.5A) and backset spacing difference (0.283" versus 0.319") require verification against circuit load and PCB layout constraints. The unthreaded flange differs mechanically from the female screwlock mating interface of the main part.

Q: Why are the 174-E25 series parts listed as substitutes if they are obsolete? A: The 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 are provided as reference substitutes based on documented part number cross-reference information in the main part's specification. Obsolete status indicates these parts are discontinued and not recommended for new designs. Existing legacy systems may reference these part numbers, and residual inventory exists (1,023–1,166 units documented), but procurement for new production is not viable.

Q: Does backset spacing variation affect connector compatibility? A: Backset spacing determines PCB mounting hole position spacing. The main part L77DFB25SAJ4RM6VF uses 0.319" (8.10mm) spacing, while 173-E25-213R001 uses 0.283" (7.20mm) and the 174-E25 series uses 0.370" (9.40mm). Direct mechanical substitution on existing PCB designs requires backset spacing compatibility. Different spacing necessitates PCB redesign or use of an alternate PCB variant.

Q: What is the significance of shell finish material differences? A: Shell finish provides corrosion resistance and environmental protection. The main part uses tin plating, 173-E25-213R001 uses nickel plating, and the 174-E25 series uses yellow chromate plating. All finishes provide equivalent environmental protection for indoor industrial applications. Application-specific chemical or corrosion exposure may require evaluation of finish suitability for harsh environments.

Q: Are voltage and current ratings interchangeable between these parts? A: The main part L77DFB25SAJ4RM6VF is rated 7.5A at 300V. All substitute parts provide UL94 V-0 flammability compliance and operate within industrial voltage ranges. The 5A current rating of substitute parts represents a 33% reduction in current capacity. Applications operating at or near 5A–7.5A range require confirmation that substitute parts meet circuit current requirements without margin erosion.

Q: Is RoHS compliance a mandatory substitution criterion? A: RoHS compliance is required for equipment marketed in EU regulated jurisdictions and many international markets. The main part and 173-E25-213R001 are RoHS compliant. The 174-E25 series parts are RoHS non-compliant and unsuitable for regulated product applications. Compliance requirement depends on the end-equipment's geographic sales and regulatory jurisdiction.