L77DFD50S1AON D-Sub 50 Position Receptacle Connector

Part Overview

The L77DFD50S1AON is a 50 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets in a right-angle, panel mount configuration with solder termination. The part is actively produced and maintained in inventory with 832 units in stock. D-Sub connectors of this type are essential for applications requiring high-density signal transmission in industrial, telecommunications, and data processing environments. Equivalent and substitute parts become necessary when addressing supply chain constraints, lead time requirements, or specific application compatibility needs while maintaining electrical and mechanical performance standards.

Substiute Parts

L77DFD50S1AON

Amphenol ICC (Commercial Products)In Stock: 937L77DFD50S1AON Datasheet

Current PartRFQ

174-E50-213R001

NorComp Inc.In Stock: 1689174-E50-213R001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L77DFD50S1AON is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Connector Type: Receptacle, Female Sockets
• Number of Positions: 50
• Number of Rows: 3
• Shell Size, Connector Layout: 5 (DD, D)
• Mounting Type: Panel Mount, Through Hole, Right Angle
• Termination: Solder
• Contact Type: Signal
• Contact Form: Machined
• Flange Feature: Housing/Shell (Unthreaded)

Allowable Variation Parameters:

• Current Rating: Substitute must meet or exceed 7.5A requirement
• Voltage Rating: Substitute must meet or exceed 300V requirement
• Operating Temperature Range: Substitute must encompass or exceed -55°C ~ 155°C range
• Shell Material and Finish: Variations permitted (Steel Tin Plated vs. Steel Nickel Plated)
• Contact Finish: Variations permitted (Gold with different thickness specifications)
• Dielectric Material: Variations permitted (Thermoplastic Glass Filled vs. Polyamide)
• Color: Variations permitted
• Backset Spacing: Minor variations permitted within connector design tolerances

The substitute part 174-E50-213R001 from NorComp Inc. meets all mandatory matching parameters and is therefore qualified as an equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (L77DFD50S1AON): The L77DFD50S1AON is the specified component and remains the primary selection. This part carries active product status, RoHS compliance certification, and maintains full inventory availability. The connector delivers 7.5A current capacity and 300V voltage rating with an extended operating temperature range of -55°C to 155°C, supporting demanding industrial applications.

Substitute Part Selection (174-E50-213R001): The 174-E50-213R001 from NorComp Inc. qualifies as an equivalent substitute based on matching all mandatory electrical and mechanical parameters. This part is also actively produced with ROHS3 compliance and higher inventory availability (1626 units). However, the following differences require engineering evaluation:

• Current Rating: 5A (lower than primary part's 7.5A)
• Operating Temperature Range: -50°C ~ 100°C (narrower than primary part's -55°C ~ 155°C)
• Backset Spacing: 0.370" (9.40mm) versus 0.406" (10.30mm)
• Voltage Rating: Not specified in substitute part documentation

Selection of the substitute part is appropriate for applications operating within the -50°C to 100°C temperature range and requiring maximum current draw not exceeding 5A. Applications requiring the full 7.5A capacity or extended temperature performance must use the primary L77DFD50S1AON part.

Frequently Asked Questions (FAQ)

Q: Can the 174-E50-213R001 be used as a direct replacement for the L77DFD50S1AON in all applications?

A: The 174-E50-213R001 is mechanically and electrically compatible for applications within its specified operating parameters. However, it is not suitable for applications requiring the full 7.5A current capacity or operating temperatures below -50°C or above 100°C. The primary part L77DFD50S1AON must be used for these demanding conditions.

Q: What is the significance of the backset spacing difference (0.406" vs. 0.370")?

A: Backset spacing defines the distance from the connector mounting face to the contact plane. The 0.036" (0.90mm) difference between parts may affect panel cutout dimensions and mating connector alignment. Physical verification against mating connector specifications is necessary before substitution.

Q: Are both parts suitable for solder termination assembly?

A: Yes. Both the L77DFD50S1AON and 174-E50-213R001 feature solder termination and are compatible with standard PCB assembly processes. Both parts carry UL94 V-0 flammability ratings, meeting fire safety requirements for electronic assemblies.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both certifications indicate compliance with Restriction of Hazardous Substances regulations. RoHS Compliant (primary part) and ROHS3 Compliant (substitute part) both restrict the use of specified hazardous materials. ROHS3 represents the current regulatory iteration. Both parts are compliant with current environmental standards.

Q: Does the shell material difference (Tin Plated vs. Nickel Plated) affect performance?

A: Both finishes provide corrosion resistance and electrical conductivity. Tin plating offers superior solderability, while nickel plating provides enhanced corrosion resistance in harsh environments. Selection depends on specific environmental exposure and assembly process requirements.

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

A: Mechanical and electrical interchangeability is confirmed for the 50-position, 3-row D-Sub receptacle configuration. However, the backset spacing difference and operating temperature range limitations of the substitute part require design verification before implementation in existing assemblies.

Q: What inventory considerations apply to these parts?

A: The L77DFD50S1AON maintains 832 units in stock, while the 174-E50-213R001 has higher availability at 1626 units. For applications where the substitute part meets all performance requirements, the higher inventory of the NorComp part may provide supply chain advantages.