L777DC37PC D-Sub Plug 37-Position Right Angle Solder Connector

Part Overview

The L777DC37PC is a 37-position D-Sub plug connector manufactured by Amphenol ICC (Commercial Products). This connector features right-angle mounting with solder termination and is classified as an active product currently in inventory. Identifying equivalent and substitute D-Sub connectors is necessary when managing component sourcing, addressing supply chain variations, or accommodating specific application requirements while maintaining electrical and mechanical compatibility within specified tolerance bands.

Substiute Parts

L777DC37PC

Amphenol ICC (Commercial Products)In Stock: 943L777DC37PC Datasheet

Current PartRFQ

173-E37-113R001

NorComp Inc.In Stock: 1071173-E37-113R001 Datasheet

SimilarRFQ

173-E37-113R141

NorComp Inc.In Stock: 994173-E37-113R141 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute D-Sub connectors for the L777DC37PC must satisfy the following core substitution criteria:

Fixed Compatibility Parameters:

• Connector Type: Plug, Male Pins
• Number of Positions: 37
• Shell Size, Connector Layout: 4 (DC, C)
• Mounting Type: Right Angle (Panel Mount and Through Hole variants acceptable)
• Termination: Solder
• Contact Type: Signal
• Flange Feature: Unthreaded Housing/Shell
• Material Flammability Rating: UL94 V-0
• Contact Material: Brass
• Contact Form: Machined

Variable Parameters Allowing Substitution:

Substitute connectors may differ in the following electrical and mechanical parameters within engineering tolerances:

• Current Rating: The L777DC37PC rated at 7.5A may be substituted by connectors rated at 5A in applications with lower current requirements. Conversely, applications demanding 7.5A require a minimum equivalent current rating.
• Voltage Rating: The L777DC37PC is rated at 300V. Substitute parts without specified voltage ratings remain acceptable for applications within 300V operation.
• Operating Temperature: The L777DC37PC operates -55°C ~ 125°C. Substitute connectors operating -50°C ~ 100°C are acceptable for applications within this narrower band.
• Shell Material Finish: Steel with Tin Plating (L777DC37PC) and Steel with Nickel Plating (substitutes) both provide corrosion resistance suitable for industrial D-Sub applications.
• Contact Finish Thickness: The L777DC37PC specifies 20.0µin (0.51µm) gold plating. Substitute connectors with Flash gold plating thickness are acceptable for general signal applications.
• Backset Spacing: The L777DC37PC at 0.319" (8.10mm) and substitute parts at 0.283" (7.20mm) represent minor mechanical dimensional variations.
• Dielectric Material: Thermoplastic Glass Filled (L777DC37PC) and Polyamide (PA6T), Nylon 6T (substitutes) both meet UL94 V-0 flammability requirements.
• RoHS Status: Both RoHS Compliant (L777DC37PC) and ROHS3 Compliant (substitutes) meet regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

Both substitute connectors—173-E37-113R001 and 173-E37-113R141—maintain active product status and meet regulatory compliance requirements (ROHS3 Compliant, REACH Unaffected, EAR99 classification).

173-E37-113R001 Suitability: This connector is suitable as a substitute for applications where current demand does not exceed 5A. The narrower operating temperature range (-50°C ~ 100°C) is acceptable for applications not requiring the extended -55°C lower limit of the L777DC37PC. The unthreaded housing configuration matches the original design.

173-E37-113R141 Suitability: This connector adds female screwlock features (4-40) and mounting brackets to the base 173-E37 configuration. It is suitable as a substitute for applications requiring the same current and temperature parameters as 173-E37-113R001, with the additional mechanical benefit of screwlock retention. The female screwlock feature provides enhanced mechanical security compared to the unthreaded design of the L777DC37PC.

Both NorComp substitutes employ nickel plating instead of tin plating for the steel shell, which maintains corrosion resistance across industrial operating conditions. The flash gold contact finish is appropriate for general signal applications within the performance envelope of the thicker gold plating specified for the L777DC37PC.

Frequently Asked Questions (FAQ)

Can the 173-E37-113R001 and 173-E37-113R141 be used interchangeably with the L777DC37PC?

The two NorComp connectors are functionally equivalent to the L777DC37PC for applications requiring a maximum of 5A continuous current. The 173-E37-113R001 is directly interchangeable where mechanical mounting does not require screwlock retention. The 173-E37-113R141 adds female screwlock features and mounting brackets, making it suitable for applications benefiting from enhanced mechanical security.

What is the significance of the backset spacing difference between the L777DC37PC (0.319") and the NorComp substitutes (0.283")?

Backset spacing defines the distance from the connector mounting face to the contact centerline. The L777DC37PC at 0.319" (8.10mm) and the NorComp substitutes at 0.283" (7.20mm) represent minor dimensional variations. This difference may affect PCB layout and mating connector positioning. Verification with the corresponding female D-Sub connector specifications is necessary to ensure proper alignment.

Why do the NorComp connectors have a lower current rating (5A vs. 7.5A)?

The L777DC37PC is rated for 7.5A continuous current per contact position, while the NorComp 173-E37 series connectors are rated for 5A. Applications with current requirements below 5A per contact can use either connector. Applications requiring the full 7.5A capacity must use the L777DC37PC or equivalent high-current alternatives.

Are the differences in shell material finish (Tin Plated vs. Nickel Plated) significant?

Both tin-plated and nickel-plated steel shells provide adequate corrosion resistance for industrial applications. Nickel plating (NorComp substitutes) offers slightly enhanced corrosion resistance in humid or chemically aggressive environments. Tin plating (L777DC37PC) is conventional for standard industrial D-Sub applications. The choice depends on environmental operating conditions; either finish is acceptable for typical electronic equipment installations.

What does "Flash" gold contact finish mean compared to the specified 20.0µin thickness?

Flash gold plating refers to a minimal, ultra-thin gold coating applied to contact surfaces, typically 2–5µin. The L777DC37PC specifies 20.0µin (0.51µm) gold plating for enhanced wear resistance and longevity in high-cycle mating applications. Flash plating is suitable for lower-cycle or stationary applications. Applications with frequent connection/disconnection cycles should use the thicker gold plating of the L777DC37PC.

Can these connectors be used in extended temperature applications?

The L777DC37PC operates from -55°C to 125°C, while the NorComp substitutes operate from -50°C to 100°C. Applications requiring operation below -50°C or above 100°C must use the L777DC37PC or identify alternatives with expanded temperature ratings. The NorComp connectors are suitable for applications within the -50°C ~ 100°C band.

What is the difference between unthreaded and screwlock flange features?

The L777DC37PC and 173-E37-113R001 feature unthreaded housings that rely on mechanical friction or panel mounting for retention. The 173-E37-113R141 includes female screwlock features (4-40 threads) that provide positive mechanical locking via mating screws. Screwlock connectors offer enhanced vibration resistance and are preferred for high-vibration environments or applications requiring secure field-removable connections.