L77SDDG50SC309 Equivalent & Substitute Parts

Part Overview

The L77SDDG50SC309 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 environments with an operating temperature range of -55°C to 125°C.

Substitute parts are identified when equivalent functional performance can be achieved through alternative manufacturers while maintaining compatibility with the core electrical and mechanical specifications required for D-Sub receptacle applications.

Substiute Parts

L77SDDG50SC309

Amphenol ICC (Commercial Products)In Stock: 1085L77SDDG50SC309 Datasheet

Current PartRFQ

171-050-203L001

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77SDDG50SC309 is determined by strict alignment with the following core parameters:

Critical Matching Parameters:

• Connector style: D-Sub
• Connector type: Receptacle, Female Sockets
• Number of positions: 50
• Number of rows: 3
• Shell size, connector layout: 5 (DD, D)
• Termination method: Solder Cup
• Contact type: Signal
• Contact finish: Gold
• Material flammability rating: UL94 V-0

Allowable Variations:

• Mounting type (free hanging vs. panel mount)
• Shell material finish (tin plated vs. nickel plated)
• Current rating (3A vs. 5A, where higher rating is acceptable)
• Operating temperature range (provided minimum and maximum are within or exceed the original specification)
• Dielectric material composition (thermoplastic glass-filled vs. polybutylene terephthalate glass-filled)
• Regulatory compliance status (RoHS vs. ROHS3)

The substitute part 171-050-203L001 meets all critical matching parameters and operates within allowable variation ranges for this product category.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (L77SDDG50SC309): Select the L77SDDG50SC309 when the application requires free-hanging, in-line mounting configuration with an extended operating temperature range of -55°C to 125°C. This part is actively produced and maintains full RoHS compliance. The tin-plated steel shell and specified gold contact finish thickness of 30.0µin provide defined corrosion resistance characteristics.

Substitute Part Selection (171-050-203L001): The 171-050-203L001 serves as a functional substitute when panel mount configuration is required instead of free-hanging installation. This part is actively produced and maintains ROHS3 compliance, which exceeds standard RoHS requirements. The higher current rating of 5A accommodates applications requiring greater current capacity than the original 3A specification.

Application Constraints: The 171-050-203L001 operates within a narrower temperature range (-50°C to 100°C) compared to the L77SDDG50SC309 (-55°C to 125°C). Applications requiring operation below -50°C or above 100°C must use the primary part. The nickel-plated shell finish of the substitute part differs from the tin-plated finish of the primary part; environmental exposure conditions should be evaluated accordingly.

Both parts maintain UL94 V-0 flammability rating and gold contact finish, ensuring compatibility with signal-level applications in industrial environments.

Frequently Asked Questions (FAQ)

Q: Can the 171-050-203L001 be used as a direct replacement for the L77SDDG50SC309 in all applications?

A: The 171-050-203L001 is functionally compatible for applications within its specified operating temperature range (-50°C to 100°C). The primary difference is mounting type: the substitute is panel mount while the original is free hanging. If your application requires free-hanging installation or operates outside the -50°C to 100°C range, the L77SDDG50SC309 is required.

Q: What is the significance of the shell material finish difference (tin plated vs. nickel plated)?

A: Both finishes provide corrosion resistance for steel shells. Tin plating offers lower contact resistance and is preferred for signal applications. Nickel plating provides enhanced corrosion resistance in harsh environments. Selection depends on environmental exposure conditions and electrical performance requirements.

Q: Does the higher current rating of the substitute part (5A vs. 3A) affect compatibility?

A: A higher current rating indicates the substitute part can safely handle greater current loads. This does not create incompatibility; it simply means the 171-050-203L001 has greater current capacity. Applications rated for 3A operation are fully compatible with the 5A-rated substitute.

Q: Are there temperature-related restrictions when using the 171-050-203L001?

A: Yes. The 171-050-203L001 operates from -50°C to 100°C, which is narrower than the L77SDDG50SC309 range of -55°C to 125°C. Applications requiring operation below -50°C or above 100°C must use the primary part.

Q: What does the difference in gold contact finish thickness mean?

A: The L77SDDG50SC309 specifies 30.0µin (0.76µm) gold plating, while the 171-050-203L001 specifies flash gold plating. Flash plating is a thin, minimal coating. For applications requiring defined contact resistance or specific wear characteristics, the thicker plating of the primary part may be preferred.

Q: Are both parts RoHS compliant?

A: Yes. The L77SDDG50SC309 is RoHS compliant. The 171-050-203L001 is ROHS3 compliant, which represents an enhanced compliance standard that includes additional restricted substances beyond standard RoHS requirements.

Q: What is the packaging format for both parts?

A: Both parts are supplied in tray packaging, suitable for automated assembly and component handling in manufacturing environments.