L77SDD50SVFM Equivalent & Substitute Parts

Part Overview

The L77SDD50SVFM is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC, featuring female sockets with solder cup termination. This connector is designed for free-hanging in-line applications and is currently in active production status. The part is RoHS compliant and rated for industrial and commercial environments with operating temperatures from -55°C to 125°C.

Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, enabling component interchangeability in specific mounting and termination configurations.

Substiute Parts

L77SDD50SVFM

Amphenol ICC (Commercial Products)In Stock: 853L77SDD50SVFM Datasheet

Current PartRFQ

171-050-203L001

NorComp Inc.In Stock: 1382171-050-203L001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for D-Sub connectors is determined by the following critical parameters:

Mandatory Matching Parameters:

• Connector type (Receptacle, Female Sockets)
• Number of positions (50)
• Number of rows (3)
• Shell size (5, DD/D layout)
• Termination method (Solder Cup)
• Contact type (Signal)
• Contact finish (Gold)

Allowable Variations:

• Mounting type (Free Hanging vs. Panel Mount) — acceptable when application permits mechanical reconfiguration
• Current rating — substitute acceptable if equal to or greater than original specification
• Shell material finish (Tin Plated vs. Nickel Plated) — both provide equivalent corrosion protection
• Dielectric material composition — both thermoplastic glass-filled variants meet UL94 V-0 flammability requirements
• Operating temperature range — substitute acceptable if it encompasses or exceeds the original range

The substitute part 171-050-203L001 (NorComp Inc.) meets all mandatory matching parameters and demonstrates acceptable variations in mounting configuration and material specifications.

Parameter Comparison

Engineering Selection Recommendations

L77SDD50SVFM Selection Criteria:

• Required for free-hanging in-line mounting configurations
• Applications requiring extended operating temperature range (-55°C to 125°C)
• Systems with specified 250V voltage rating requirement
• Amphenol ICC supply chain preference or existing qualification

171-050-203L001 Selection Criteria:

• Panel mount applications where connector is mounted to enclosure or PCB
• Systems operating within -50°C to 100°C temperature range
• Applications where 5A current capacity provides design margin over 3A requirement
• NorComp Inc. supply chain preference or existing qualification
• ROHS3 compliance requirement (enhanced RoHS directive)

Both parts maintain active product status and meet UL94 V-0 flammability standards. Selection between these parts is determined by mechanical mounting requirements and thermal operating envelope specifications.

Frequently Asked Questions (FAQ)

Q: Can 171-050-203L001 be used as a direct replacement for L77SDD50SVFM in free-hanging applications?

A: No. The 171-050-203L001 is designed for panel mount configuration with unthreaded housing flange. The L77SDD50SVFM features mating-side female screwlock (M3) for free-hanging in-line mounting. Mechanical mounting interfaces are not compatible without redesign.

Q: Are the solder cup terminations identical between these parts?

A: Both parts use solder cup termination. Wire gauge specifications differ: L77SDD50SVFM does not specify wire gauge; 171-050-203L001 specifies 20-28 AWG. Verify wire gauge compatibility with your assembly process.

Q: What is the significance of the current rating difference (3A vs. 5A)?

A: The 171-050-203L001 has a higher current rating (5A) than the L77SDD50SVFM (3A). In applications requiring only 3A or less, either part is acceptable. The higher rating on the substitute provides additional design margin but does not affect compatibility for lower-current applications.

Q: Do the shell material finishes affect electrical performance?

A: Both tin plating and nickel plating provide equivalent corrosion protection and electrical conductivity for signal-level applications. Selection between tin and nickel finish is determined by environmental exposure and existing material specifications in your design.

Q: Is the operating temperature range difference critical?

A: The L77SDD50SVFM operates from -55°C to 125°C; the 171-050-203L001 operates from -50°C to 100°C. If your application requires operation below -50°C or above 100°C, the L77SDD50SVFM is required. For applications within -50°C to 100°C, both parts are acceptable.

Q: Are both parts RoHS compliant?

A: Yes. The L77SDD50SVFM is RoHS compliant; the 171-050-203L001 is ROHS3 compliant. ROHS3 represents an enhanced version of the RoHS directive. Both meet current regulatory requirements.

Q: What does "Contact Form: Stamped" mean for both parts?

A: Stamped contact form indicates the connector contacts are manufactured through stamping processes rather than machining. This is standard for high-volume D-Sub connectors and does not affect electrical performance or compatibility.