L77SDDG50SOL2RM8G D-Sub Receptacle Connector Equivalents & Substitutes

Part Overview

The L77SDDG50SOL2RM8G is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC, designed for through-hole board-side mounting applications. This connector features female sockets with solder termination, tin-plated steel shell, and gold-flashed contacts. The product is active and in stock with 1031 units available. Identifying equivalent substitute parts is necessary for design flexibility, supply chain resilience, and manufacturing optimization when the primary component becomes unavailable or when design requirements necessitate alternative mounting configurations.

Substiute Parts

L77SDDG50SOL2RM8G

Amphenol ICC (Commercial Products)In Stock: 1083L77SDDG50SOL2RM8G Datasheet

Current PartRFQ

172-050-283L001

NorComp Inc.In Stock: 1329172-050-283L001 Datasheet

SimilarRFQ

172-050-283L011

NorComp Inc.In Stock: 1240172-050-283L011 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Two substitute parts are identified for the L77SDDG50SOL2RM8G: NorComp 172-050-283L001 and NorComp 172-050-283L011. Both substitutes maintain the core functional parameters required for D-Sub 50-position receptacle applications: identical connector type (D-Sub receptacle, female sockets), position count (50), shell size (5/DD/D), number of rows (3), solder termination, and signal contact type. Both achieve UL94 V-0 flammability compliance and RoHS3 certification.

Key differences exist in mounting configuration and contact material. The primary part uses board-side mounting with M3 flange, while both substitutes support panel mount through-hole configurations. The 172-050-283L001 features a housing/shell unthreaded flange, whereas the 172-050-283L011 includes a board-side 4-40 flange. Both substitutes employ brass contacts with machined contact form versus phosphor bronze stamped contacts in the primary part. The substitutes support higher current ratings (5A vs. 3A) and use nickel-plated steel shells instead of tin plating.

Substitution is governed by compatibility in: connector style, position count, shell size, row configuration, termination method, contact type classification, flammability rating, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and achieve equivalent compliance certifications (UL94 V-0 flammability rating and RoHS3 certification). The 172-050-283L001 and 172-050-283L011 are suitable alternatives when the primary L77SDDG50SOL2RM8G becomes unavailable or when panel-mount configurations are required instead of board-side mounting.

Selection between the two NorComp substitutes depends on flange requirements. The 172-050-283L001 with unthreaded housing flange accommodates applications without specific fastening needs, while the 172-050-283L011 with board-side 4-40 flange provides mechanical fastening compatible with M3-equivalent metric hardware.

The 172-050-283L011 is the preferred substitute when board-side fastening is required, offering the closest mechanical alignment to the original M3 flange configuration through its 4-40 board-side mounting feature. Both NorComp parts support higher current capacity (5A versus 3A), providing operational headroom for thermally-constrained applications.

Applications operating below -50°C require verification against the primary component's -55°C minimum rating, as both substitutes specify -50°C minimum operating temperature. The primary component explicitly specifies 250V rating; substitute parts do not provide voltage specification and must be evaluated against individual circuit voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can the NorComp 172-050-283L011 directly replace the Amphenol L77SDDG50SOL2RM8G on an existing board?

A: Direct mechanical replacement depends on PCB layout compatibility. Both parts share identical D-Sub 50-position geometry and solder termination. The primary difference is the flange configuration: the original uses M3 board-side fastening, while the 172-050-283L011 uses 4-40 board-side fastening. Hole spacing and diameter must be verified against your PCB design before substitution.

Q: What is the key difference between 172-050-283L001 and 172-050-283L011?

A: Both are electrically and functionally equivalent 50-position D-Sub receptacles from NorComp. The primary difference is the flange mounting configuration. The 172-050-283L001 features an unthreaded housing flange for applications without fastening requirements. The 172-050-283L011 includes a board-side 4-40 threaded flange for mechanical fastening to PCBs or panels.

Q: Are there contact material differences that affect signal integrity?

A: Yes. The primary part uses phosphor bronze stamped contacts, while both NorComp substitutes use brass machined contacts. Both materials are suitable for D-Sub signal applications with gold-flash plating. Brass machined contacts provide consistent geometry and may offer improved contact pressure characteristics. Phosphor bronze stamped contacts provide cost optimization. Signal integrity for both is equivalent within D-Sub connector performance specifications.

Q: Which substitute should be selected for new designs?

A: For new PCB designs requiring board-side fastening, the 172-050-283L011 provides the best mechanical compatibility with metric fastening practices through its 4-40 board-side flange. For panel-mount or non-fastened applications, the 172-050-283L001 is suitable. Both achieve superior current capacity (5A) compared to the original 3A rating.

Q: Do the substitutes meet the same temperature range as the primary part?

A: The primary L77SDDG50SOL2RM8G operates from -55°C to 125°C. Both NorComp substitutes operate from -50°C to 125°C. Applications requiring operation below -50°C cannot use these substitutes without additional thermal analysis and qualification.

Q: What packaging configurations are available?

A: The primary part is provided in standard packaging (not specified in detail). Both NorComp substitutes are supplied in tray packaging suitable for manual assembly and automated pick-and-place operations.

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