L77DFCF37S D-Sub Receptacle Connector

Part Overview

The L77DFCF37S is a 37-position D-Sub panel-mount receptacle connector with female sockets manufactured by Amphenol ICC. This connector is actively supported and widely used in applications requiring standard D-Sub interconnection. Finding substitute parts becomes necessary when the primary manufacturer experiences supply constraints, inventory limitations, or when engineering specifications require alternative contact finishes or material compositions within acceptable parameter ranges.

Substiute Parts

L77DFCF37S

Amphenol ICC (Commercial Products)In Stock: 772L77DFCF37S Datasheet

Current PartRFQ

172-037-202R001

NorComp Inc.In Stock: 933172-037-202R001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution validity for D-Sub receptacle connectors is determined by mechanical and electrical compatibility across the following critical parameters:

Mechanical Compatibility Requirements:

• Connector type must be receptacle with female sockets
• Number of positions and rows (37 positions, 2 rows) must match exactly
• Shell size and layout (4, DC, C) must be identical
• Mounting type (panel mount) must be consistent
• Flange feature (unthreaded housing/shell) must match
• Termination method (solder cup) must be identical

Electrical Compatibility Requirements:

• Voltage rating of substitute must equal or exceed 300V
• Current rating of substitute must equal or exceed 7.5A
• Operating temperature range must encompass the application requirements
• Material flammability rating must meet UL94 V-0 or equivalent standard

Acceptable Variations:

• Shell finish (tin plated, nickel plated)
• Contact finish material and thickness (gold, gold flash, nickel)
• Contact material composition (copper alloy, brass)
• Dielectric material type (thermoplastic glass-filled, polybutylene terephthalate)
• Color of housing
• Wire gauge specification (if provided)

The NorComp 172-037-202R001 meets these compatibility criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (L77DFCF37S) Selection: The L77DFCF37S is the preferred choice for new designs and procurement. The connector holds active product status with current manufacturer support and RoHS compliance. It supports the full specified operating range of -55°C to 125°C and current rating of 7.5A.

Substitute Part (172-037-202R001) Selection: The NorComp 172-037-202R001 presents a functionally compatible alternative where mechanical and electrical compatibility are established. However, this part carries obsolete product status and requires careful evaluation before selection:

• Current rating of 5A limits application to designs requiring maximum 5A per contact
• Operating temperature maximum of 100°C restricts high-temperature applications
• Flash gold contact finish may affect long-term reliability in high-cycle mating environments compared to 20.0µin plating
• REACH Unaffected status differs from RoHS Compliant classification of the primary part

Substitution with NorComp 172-037-202R001 is suitable only when application parameters fall within its electrical and thermal specifications and when supply of the primary part is unavailable.

Frequently Asked Questions (FAQ)

Q: Can the NorComp 172-037-202R001 be used as a direct replacement for the Amphenol L77DFCF37S?

A: Mechanical interchangeability is confirmed across connector type, position count, row configuration, shell size, and mounting type. Electrical compatibility is conditional: applications drawing 5A or less per contact and operating within -50°C to 100°C will function equivalently. Applications exceeding 5A or requiring operation above 100°C require the primary Amphenol part.

Q: What is the significance of the "obsolete" product status of the NorComp part?

A: Obsolete status indicates the manufacturer has discontinued production and engineering support. Inventory availability may be limited, and no future design revisions or technical updates are expected. For new designs intended for long production runs, selection of the active Amphenol part is strongly advised.

Q: Are there packaging differences between the two parts?

A: Yes. The Amphenol L77DFCF37S is supplied in bag packaging, while the NorComp 172-037-202R001 is supplied in tray packaging. This difference affects handling, storage, and automated assembly processes.

Q: Why does the current rating differ between the two parts?

A: The NorComp connector specification limits maximum continuous current to 5A per contact, while the Amphenol part supports 7.5A. This reflects differences in internal contact geometry, material composition, and engineering margins. Designs requiring 5A to 7.5A operation must use the Amphenol part.

Q: How do contact finish specifications affect compatibility?

A: Both parts specify gold plating. The Amphenol part provides 20.0µin (0.51µm) thickness, while the NorComp part specifies flash plating. Thicker plating typically offers superior performance in high-cycle mating applications and corrosive environments. Applications with lower mating cycle counts or benign environments tolerate flash plating.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both designations confirm compliance with Restriction of Hazardous Substances requirements. RoHS3 references the most current regulatory standard. Both parts meet hazardous substance restrictions suitable for electronics assembly in regulated markets.