L777SDCG37P D-Sub Plug 37 Position Connector Equivalent & Substitute Parts

Part Overview

The L777SDCG37P is a 37 position D-Sub plug connector manufactured by Amphenol ICC (Commercial Products). This connector features male pins with solder cup termination and is designed for free hanging in-line applications. The part is currently active in production with 1139 pieces in stock inventory.

D-Sub connectors of this configuration are essential components in industrial control systems, data acquisition equipment, and legacy computing applications where 37-pin serial and parallel communication interfaces are required. Equivalent and substitute parts become necessary when the primary part experiences supply constraints, when specific mounting or termination requirements differ between applications, or when alternative manufacturers offer compatible solutions with identical electrical and mechanical specifications.

Substiute Parts

L777SDCG37P

Amphenol ICC (Commercial Products)In Stock: 1225L777SDCG37P Datasheet

Current PartRFQ

171-037-103L001

NorComp Inc.In Stock: 1179171-037-103L001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of D-Sub connectors is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

• Connector style (D-Sub)
• Connector type (Plug with male pins)
• Number of positions (37)
• Number of rows (2)
• Shell size and connector layout (4 / DC, C)
• Termination method (Solder Cup)
• Contact type (Signal)
• Material flammability rating (UL94 V-0)

Application-Dependent Parameters:

• Mounting type (free hanging in-line versus panel mount)
• Shell material and finish
• Contact finish and thickness
• Flange feature configuration
• Operating temperature range
• Current rating capacity

The substitute part NorComp Inc. 171-037-103L001 maintains equivalence across all mandatory parameters. However, it differs in mounting type (panel mount versus free hanging), shell material finish (nickel plated versus tin plated), contact finish thickness (flash versus 15.0µin), and operating temperature range (-50°C ~ 100°C versus -55°C ~ 125°C). These differences establish it as a functional substitute for applications where the specific mounting configuration and thermal requirements of the substitute are acceptable.

Parameter Comparison

Engineering Selection Recommendations

L777SDCG37P Selection Criteria:

The L777SDCG37P is the primary choice for applications requiring free hanging in-line mounting configuration. This part supports the full operating temperature range of -55°C to 125°C, making it suitable for industrial environments with extended thermal requirements. The tin-plated steel shell with 15.0µin gold contact finish provides specified corrosion resistance characteristics. The part maintains active production status with RoHS compliance and carries a 3A current rating at 250V voltage specification. This configuration is appropriate for legacy serial communication interfaces, parallel data acquisition systems, and industrial control applications where the connector remains unattached to a panel structure.

171-037-103L001 Selection Criteria:

The NorComp Inc. 171-037-103L001 serves as a functional substitute for applications where panel mount configuration is required. This part supports a higher current rating of 5A and maintains ROHS3 compliance status. The operating temperature range of -50°C to 100°C is suitable for standard industrial and commercial environments. The nickel-plated steel shell with flash gold contact finish provides alternative corrosion resistance characteristics. This configuration is appropriate for applications where the connector must be mounted directly to an equipment panel or enclosure. The substitute part is currently in active production with equivalent inventory availability.

Both parts maintain identical electrical pin configuration (37 positions, 2 rows, shell size 4), identical termination method (solder cup), and identical flammability rating (UL94 V-0). Selection between these parts depends exclusively on the mechanical mounting requirement and the specific operating temperature and current specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can the NorComp 171-037-103L001 be used as a direct replacement for the Amphenol L777SDCG37P in all applications?

A: No. While both connectors share identical pin configuration and electrical characteristics, they differ in mounting type. The L777SDCG37P is designed for free hanging in-line applications, while the 171-037-103L001 is configured for panel mount. Selection depends on whether the connector must be attached to a panel structure or remain as a cable-mounted assembly.

Q: What is the significance of the operating temperature range difference between these two parts?

A: The L777SDCG37P operates from -55°C to 125°C, while the 171-037-103L001 operates from -50°C to 100°C. Applications requiring operation below -50°C or above 100°C must use the L777SDCG37P. Applications operating within the -50°C to 100°C range can use either part, provided the mounting type requirement is satisfied.

Q: Are there differences in contact finish that affect electrical performance?

A: Both parts feature gold contact finish. The L777SDCG37P specifies 15.0µin (0.38µm) thickness, while the 171-037-103L001 specifies flash thickness. Flash thickness provides minimal gold coverage. For applications requiring specified contact finish thickness for long-term reliability or specific electrical performance characteristics, the L777SDCG37P is the appropriate selection.

Q: What is the difference between tin-plated and nickel-plated shell finishes?

A: The L777SDCG37P features tin-plated steel shell, while the 171-037-103L001 features nickel-plated steel shell. Both finishes provide corrosion resistance. Tin plating is typically used in standard industrial applications, while nickel plating provides enhanced corrosion resistance in more demanding environments. Selection depends on the specific environmental exposure and corrosion resistance requirements of the application.

Q: Can these connectors be used interchangeably in legacy equipment designed for 37-pin D-Sub connections?

A: Electrical and pin configuration compatibility exists between these parts. However, mechanical compatibility depends on the mounting structure of the legacy equipment. Equipment designed for free hanging in-line connectors requires the L777SDCG37P. Equipment with panel-mounted connector receptacles requires the 171-037-103L001. Physical inspection of the mating receptacle configuration is necessary to determine compatibility.

Q: What is the current rating difference, and does it affect substitution decisions?

A: The L777SDCG37P is rated for 3A, while the 171-037-103L001 is rated for 5A. The higher current rating of the substitute part does not prevent its use in applications requiring 3A or less. However, if the application requires current capacity exceeding 3A but within 5A, only the 171-037-103L001 is suitable, provided the mounting type requirement is satisfied.

Q: Are both parts RoHS compliant?

A: Yes. The L777SDCG37P is RoHS Compliant. The 171-037-103L001 is ROHS3 Compliant. Both parts meet RoHS requirements. ROHS3 represents a more recent compliance standard revision. Both parts are acceptable for applications requiring RoHS compliance.

Q: What does MSL 1 (Unlimited) mean for these connectors?

A: Moisture Sensitivity Level 1 (Unlimited) indicates that these connectors have no moisture sensitivity restrictions. They can be stored and handled without special moisture control measures, and no baking or conditioning is required prior to soldering or assembly.