L77DFD50SV

Part Overview

The L77DFD50SV is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This female sockets connector features panel mount, through-hole solder termination with a 3-row, DD/D shell size configuration. The part is currently active in production. Alternative models become necessary when managing inventory constraints, addressing obsolescence concerns, or accommodating varying compliance requirements across supply chains.

Substiute Parts

L77DFD50SV

Amphenol ICC (Commercial Products)In Stock: 970L77DFD50SV Datasheet

Current PartRFQ

172-050-212R001

NorComp Inc.In Stock: 772172-050-212R001 Datasheet

SimilarRFQ

DDM50S332N

Amphenol ICC (FCI)In Stock: 871DDM50S332N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L77DFD50SV is constrained by the following mandatory parameters: 50-position configuration, D-Sub receptacle style with female sockets, 3-row layout, DD/D shell size, panel mount through-hole solder termination, signal contact type, and unthreaded housing/shell flange. The identified substitute parts maintain these core mechanical and functional parameters while allowing variation in secondary attributes such as contact finish thickness, shell material finish, dielectric materials, and compliance certifications.

Key Parameters for Substitution:

• Connector type: D-Sub receptacle, female sockets
• Positions and rows: 50 positions, 3 rows
• Shell size: DD/D (Size 5)
• Mounting: Panel mount, through hole
• Termination: Solder
• Flange type: Unthreaded housing/shell

Parameter Comparison

Engineering Selection Recommendations

172-050-212R001 (NorComp Inc.): This part is marked as obsolete and carries ROHS3 compliance. While it meets the core mechanical and functional substitution criteria, its obsolete status presents supply chain risk. The current rating of 5A is lower than the primary part's 7.5A specification and may limit suitability in higher-current applications. The narrower operating temperature range (-50°C ~ 100°C) restricts use in extreme temperature environments compared to the L77DFD50SV (-55°C ~ 155°C).

DDM50S332N (Amphenol FCI): This active part maintains electrical and mechanical compatibility with the L77DFD50SV, sharing the same 7.5A current rating and 300V voltage specification. Both parts carry RoHS non-compliant and UL94 V-0 certifications. The primary distinction is the operating temperature range: DDM50S332N supports -55°C ~ 125°C, which is slightly narrower than the L77DFD50SV's -55°C ~ 155°C range. The mounting specification for DDM50S332N lists only "Through Hole" without the explicit "Panel Mount" designation. Contact material differs (phosphor bronze vs. copper alloy) and shell finish is yellow cadmium plated rather than tin plated.

Frequently Asked Questions (FAQ)

Q: Can the 172-050-212R001 be used as a direct substitute despite its obsolete status? A: The 172-050-212R001 meets the core mechanical and electrical substitution criteria for D-Sub 50-position configuration. However, its obsolete product status presents long-term supply chain risk. The lower current rating (5A versus 7.5A) may restrict application in designs requiring the higher current specification of the L77DFD50SV.

Q: What is the significance of the different contact materials among these connectors? A: Contact material variations—copper alloy in L77DFD50SV, brass in 172-050-212R001, and phosphor bronze in DDM50S332N—affect electrical conductivity, springback characteristics, and long-term contact resistance stability. All three materials maintain gold plating on the contact surfaces, which provides corrosion resistance and consistent contact interface.

Q: How do the operating temperature ranges affect substitution decisions? A: The L77DFD50SV supports -55°C ~ 155°C, while DDM50S332N supports -55°C ~ 125°C and 172-050-212R001 supports -50°C ~ 100°C. Temperature range alignment depends on specific application requirements. If the application requires operation above 125°C, only the L77DFD50SV qualifies. If maximum temperature does not exceed 100°C, all three parts are suitable from a thermal perspective.

Q: Does RoHS compliance status affect substitutability? A: The L77DFD50SV and DDM50S332N are both RoHS non-compliant, while 172-050-212R001 is ROHS3 compliant. Substitution based on compliance status depends on end-application regulatory requirements. In RoHS-restricted applications, only 172-050-212R001 qualifies, despite its obsolete status.

Q: What packaging differences exist among the substitute parts? A: L77DFD50SV is supplied in unspecified packaging, 172-050-212R001 is supplied in trays, and DDM50S332N is supplied in bulk. Packaging affects logistics and handling procedures but does not impact electrical or mechanical compatibility.