L77SDDG50S D-Sub Receptacle Connector Equivalent & Substitute Parts

Part Overview

The L77SDDG50S is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets with solder cup termination and is designed for free-hanging, in-line applications. The part is currently active in production with 1041 pieces in stock inventory.

D-Sub receptacle connectors are essential components in applications requiring robust signal transmission and mechanical durability. Equivalent and substitute parts become necessary when addressing supply chain constraints, specific mounting requirements, or application-specific performance parameters that differ from the original specification.

Substiute Parts

L77SDDG50S

Amphenol ICC (Commercial Products)In Stock: 1091L77SDDG50S Datasheet

Current PartRFQ

171-050-203L001

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L77SDDG50S is determined by strict alignment of core electrical and mechanical parameters. The following parameters must remain consistent across substitute parts:

Critical Matching Parameters:

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

Parameters Permitting Variation:

• Mounting type (Free Hanging vs. Panel Mount)
• Shell material finish (Tin Plated vs. Nickel Plated)
• Current rating (3A vs. 5A)
• Voltage rating (250V vs. unspecified)
• Operating temperature range (-55°C ~ 125°C vs. -50°C ~ 100°C)
• Dielectric material composition (Thermoplastic, Glass Filled vs. PBT, Glass Filled)
• Manufacturer and series designation

The substitute part 171-050-203L001 (NorComp Inc.) meets all critical matching parameters while differing in mounting configuration and certain material specifications.

Parameter Comparison

Engineering Selection Recommendations

L77SDDG50S Selection Criteria:

• Applications requiring free-hanging, in-line connector orientation
• Systems operating across the extended temperature range of -55°C to 125°C
• Designs specifying 250V voltage rating
• Tin-plated shell finish preference
• Unlimited moisture sensitivity tolerance (MSL 1)

171-050-203L001 Selection Criteria:

• Applications requiring panel-mount connector orientation
• Systems operating within -50°C to 100°C temperature range
• Higher current capacity requirement (5A vs. 3A)
• Nickel-plated shell finish preference
• ROHS3 compliance requirement
• PBT dielectric material specification

Both parts maintain active product status and share identical ECCN and HTSUS classifications. Both connectors comply with UL94 V-0 flammability standards and feature gold-flash contact finish with stamped contact form. The primary substitution decision hinges on mounting configuration (free-hanging vs. panel mount) and operating environment parameters.

Frequently Asked Questions (FAQ)

Q: Can the 171-050-203L001 directly replace the L77SDDG50S in existing designs?

A: Direct replacement depends on mounting configuration. The L77SDDG50S is free-hanging (in-line), while the 171-050-203L001 is panel-mount. If the application requires in-line mounting, the 171-050-203L001 is not a direct replacement. If panel mounting is acceptable, the substitute is compatible for signal transmission applications.

Q: What are the implications of the different operating temperature ranges?

A: The L77SDDG50S operates from -55°C to 125°C, while the 171-050-203L001 operates from -50°C to 100°C. Applications requiring operation below -50°C or above 100°C must use the L77SDDG50S. Applications within the -50°C to 100°C window can use either part.

Q: Does the higher current rating of the 171-050-203L001 (5A vs. 3A) affect compatibility?

A: The higher current rating of the 171-050-203L001 does not create incompatibility. A connector rated for 5A can safely carry signals designed for 3A. This represents a performance advantage in the substitute part for current-limited applications.

Q: Are there differences in shell material finish that affect performance?

A: The L77SDDG50S features tin-plated steel, while the 171-050-203L001 features nickel-plated steel. Both finishes provide corrosion resistance and electrical conductivity. Material finish selection depends on specific environmental exposure and contact resistance requirements of the application.

Q: What is the significance of the different dielectric materials?

A: The L77SDDG50S uses thermoplastic glass-filled dielectric, while the 171-050-203L001 uses PBT (polybutylene terephthalate) glass-filled dielectric. Both materials meet UL94 V-0 flammability standards. PBT offers enhanced chemical resistance and dimensional stability in certain environments.

Q: How do the RoHS compliance levels differ?

A: The L77SDDG50S is RoHS Compliant, while the 171-050-203L001 is ROHS3 Compliant. ROHS3 represents an updated compliance standard. Both parts are suitable for RoHS-regulated applications, with the 171-050-203L001 meeting the more recent standard.

Q: What does MSL 1 (Unlimited) on the L77SDDG50S indicate?

A: MSL 1 (Unlimited) indicates that the L77SDDG50S has no moisture sensitivity restrictions and requires no special handling or storage conditions related to moisture exposure. The 171-050-203L001 lists MSL as Not Applicable, indicating similar non-sensitivity to moisture.

Q: Are both parts suitable for solder cup termination processes?

A: Yes. Both the L77SDDG50S and 171-050-203L001 feature solder cup termination. Both are compatible with standard wave soldering and hand soldering processes used for D-Sub connector assembly.