L77DFDF50SU D-Sub 50 Position Receptacle Connector Equivalent & Substitute Parts

Part Overview

The L77DFDF50SU is a 50 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This panel mount, through hole solder termination connector features female sockets in a 3-row configuration with shell size 5 (DD, D) layout. The connector is actively produced and stocked with 871 pieces available in inventory. Alternative equivalent parts are necessary to support supply chain flexibility, procurement optimization, and application-specific requirements where mounting style, voltage rating, or current capacity variations are acceptable within system design parameters.

Substiute Parts

L77DFDF50SU

Amphenol ICC (Commercial Products)In Stock: 928L77DFDF50SU Datasheet

Current PartRFQ

5745080-4

TE Connectivity AMP ConnectorsIn Stock: 15255745080-4 Datasheet

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5745080-6

TE Connectivity AMP ConnectorsIn Stock: 12025745080-6 Datasheet

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DDM50S332N

Amphenol ICC (FCI)In Stock: 871DDM50S332N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of D-Sub 50 position receptacle connectors is determined by strict equivalence in the following core parameters: connector type (receptacle, female sockets), number of positions (50), number of rows (3), shell size and layout (5 DD, D), and termination method (solder). All substitute parts listed maintain these critical specifications.

Acceptable variations in substitute parts include:

Mounting configuration: The main part specifies panel mount with through hole termination. Substitute parts may specify through hole mounting without explicit panel mount designation, provided the connector accommodates solder termination to printed circuit boards or wire harnesses.

Current and voltage ratings: Substitute parts may operate at reduced current capacity (6A versus 7.5A) or voltage rating (125V versus 300V). Selection depends on application requirements.

Operating temperature range: Substitute parts may have narrower temperature ranges (-55°C ~ 105°C or -55°C ~ 125°C versus -55°C ~ 155°C). Selection depends on thermal environment specifications.

Contact finish thickness: Variations in gold plating thickness (20µin, 30µin, or 50µin) are acceptable provided gold finish is maintained.

Shell material and finish: Variations in shell material composition and plating (steel tin plated, steel yellow cadmium plated) are acceptable.

Flange feature: Variations between unthreaded housing/shell and mating side female screwlock configurations are acceptable.

Compliance status: RoHS compliant and non-compliant variants are listed. Selection depends on regulatory requirements of the end application.

Parameter Comparison

Engineering Selection Recommendations

L77DFDF50SU (Amphenol ICC Commercial Products)

Select this part for applications requiring the highest operating temperature range (-55°C ~ 155°C) and RoHS compliance. This connector is actively produced with adequate inventory. The 7.5A current rating and 300V voltage rating support high-power signal distribution applications. Panel mount configuration with through hole solder termination is optimized for direct PCB integration.

5745080-4 and 5745080-6 (TE Connectivity AMPLIMITE HD-20 Series)

These parts are functionally identical and interchangeable. Select either variant for applications where operating temperature does not exceed 105°C and voltage requirements do not exceed 125V. Both parts are ROHS3 compliant and actively produced with higher inventory availability (1425 and 1166 pieces respectively). The 6A current rating is suitable for moderate-power applications. Female screwlock mating side feature provides additional mechanical retention. Through hole mounting supports standard PCB assembly processes.

DDM50S332N (Amphenol ICC FCI DMW HE507 Series)

Select this part for applications requiring 300V voltage rating and 7.5A current capacity where RoHS compliance is not mandated. Operating temperature range extends to 125°C. This connector features the thickest gold contact finish (50µin) for enhanced durability in high-cycle mating environments. Actively produced with 827 pieces in inventory. Note: This part is RoHS non-compliant due to yellow cadmium plating on steel shell.

Frequently Asked Questions (FAQ)

Q: Can 5745080-4 or 5745080-6 be used as direct replacements for L77DFDF50SU?

A: These parts are mechanically and electrically compatible for applications operating at or below 125V and 105°C. The 6A current rating is lower than the L77DFDF50SU specification of 7.5A. Verify that application current requirements do not exceed 6A per contact. Both parts are ROHS3 compliant, meeting modern regulatory requirements.

Q: What is the difference between 5745080-4 and 5745080-6?

A: Both parts are identical in electrical and mechanical specifications. They are variants within the TE Connectivity AMPLIMITE HD-20 series with different internal designations. Either part may be selected interchangeably.

Q: Is DDM50S332N suitable for high-temperature applications?

A: DDM50S332N operates to 125°C maximum, which is lower than L77DFDF50SU (155°C). Select DDM50S332N only for applications with maximum operating temperature of 125°C or below. This part is not suitable for applications requiring the full 155°C temperature range of the L77DFDF50SU.

Q: What is the significance of contact finish thickness differences?

A: Contact finish thickness affects durability in high-cycle mating applications. L77DFDF50SU specifies 20µin gold plating, while substitute parts range from 30µin to 50µin. Thicker plating (DDM50S332N at 50µin) provides enhanced wear resistance. All variants maintain gold finish for reliable electrical contact.

Q: Are all substitute parts RoHS compliant?

A: No. L77DFDF50SU and both TE Connectivity parts (5745080-4, 5745080-6) are RoHS compliant or ROHS3 compliant. DDM50S332N is RoHS non-compliant due to yellow cadmium plating. Select RoHS-compliant variants for applications subject to EU RoHS Directive or equivalent regulations.

Q: What is the difference between panel mount and through hole mounting?

A: L77DFDF50SU specifies panel mount with through hole termination, designed for direct mounting to a panel with solder connections to PCB or wire harness. Substitute parts specify through hole mounting without explicit panel mount designation. Verify mechanical fit within the application enclosure before substitution.

Q: Can these connectors be used interchangeably in existing designs?

A: Mechanical and electrical compatibility must be verified. All parts maintain 50 position, 3-row, shell size 5 (DD, D) configuration with solder termination. Verify that application voltage (125V or 300V), current (6A or 7.5A), and temperature (-55°C ~ 105°C, -55°C ~ 125°C, or -55°C ~ 155°C) requirements are met by the substitute part. Compliance requirements (RoHS status) must also be confirmed.

Q: What inventory levels are available for each part?

A: L77DFDF50SU: 871 pieces; 5745080-4: 1425 pieces; 5745080-6: 1166 pieces; DDM50S332N: 827 pieces. Higher inventory availability for TE Connectivity parts may support shorter lead times for high-volume procurement.