L77DFC37S D-Sub 37 Position Panel Mount Receptacle Connector

Part Overview

The L77DFC37S is a 37 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets configured for panel mount installation with solder cup termination. The part maintains active product status with 840 units in current inventory.

The L77DFC37S serves applications requiring robust D-Sub connectivity in industrial and commercial environments. Identification of equivalent and substitute parts becomes necessary when addressing supply chain continuity, inventory optimization, or when the primary part reaches end-of-life status.

Substiute Parts

L77DFC37S

Amphenol ICC (Commercial Products)In Stock: 920L77DFC37S Datasheet

Current PartRFQ

172-037-202R001

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L77DFC37S is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Connector Style: D-Sub
• Connector Type: Receptacle, Female Sockets
• Number of Positions: 37
• Number of Rows: 2
• Shell Size, Connector Layout: 4 (DC, C)
• Mounting Type: Panel Mount
• Termination: Solder Cup
• Flange Feature: Housing/Shell (Unthreaded)
• Contact Type: Signal

Allowable Variation Parameters:

• Shell Material and Finish (Steel, Tin Plated acceptable)
• Contact Finish (Gold acceptable)
• Current Rating (minimum 5A acceptable for reduced-current applications)
• Voltage Rating (300V or unspecified acceptable)
• Operating Temperature Range (reduced range acceptable for limited-temperature applications)
• Dielectric Material (Thermoplastic or PBT Glass Filled acceptable)
• Contact Material (Copper Alloy or Brass acceptable)
• Color (functional equivalence regardless of color)
• Packaging format (Bag or Tray acceptable)

The substitute part 172-037-202R001 manufactured by NorComp Inc. meets all mandatory matching parameters and operates within allowable variation ranges for this connector category.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: L77DFC37S

The L77DFC37S maintains active product status with full inventory availability (840 units). This connector is RoHS Compliant and carries a current rating of 7.5A with a 300V voltage specification. The operating temperature range of -55°C to 125°C supports extended environmental applications. Selection of the primary part is recommended for new designs and applications requiring long-term supply assurance.

Substitute Selection: 172-037-202R001

The 172-037-202R001 is classified as obsolete and carries ROHS3 Compliant status. This substitute part exhibits reduced electrical performance specifications: current rating of 5A (versus 7.5A) and operating temperature range of -50°C to 100°C (versus -55°C to 125°C). The contact finish thickness is specified as flash coating rather than 20.0µin plating.

Substitution with 172-037-202R001 is applicable only in applications where:

• Maximum current demand does not exceed 5A
• Operating temperature remains within -50°C to 100°C range
• Reduced contact finish thickness is functionally acceptable
• Obsolete part status does not conflict with supply chain requirements

Both connectors satisfy identical mechanical and connector configuration requirements. The choice between primary and substitute parts depends on electrical performance requirements and product lifecycle considerations.

Frequently Asked Questions (FAQ)

Q: Can the 172-037-202R001 be used as a direct replacement for the L77DFC37S in all applications?

A: No. The 172-037-202R001 has a reduced current rating of 5A compared to the L77DFC37S rating of 7.5A. Applications requiring current levels between 5A and 7.5A cannot use the substitute part. Additionally, the operating temperature range is narrower (-50°C to 100°C versus -55°C to 125°C).

Q: What is the significance of the contact finish thickness difference?

A: The L77DFC37S specifies 20.0µin (0.51µm) gold plating, while the 172-037-202R001 specifies flash coating. Flash coating provides minimal gold coverage for corrosion protection. Applications in high-humidity or corrosive environments may require the thicker plating of the primary part.

Q: Does the obsolete status of 172-037-202R001 affect its electrical performance?

A: Obsolete status indicates the part is no longer manufactured. Electrical performance specifications remain unchanged. However, inventory availability is limited (894 units reported), and future procurement may become impossible.

Q: Are the dielectric materials functionally equivalent?

A: Both materials are glass-filled polymers with UL94 V-0 flammability rating. The L77DFC37S uses Thermoplastic while the 172-037-202R001 uses Polybutylene Terephthalate (PBT). Both materials provide equivalent insulation and mechanical properties for this connector category.

Q: What is the impact of different contact materials (Copper Alloy versus Brass)?

A: Both materials provide acceptable electrical conductivity for signal-level D-Sub applications. Copper Alloy and Brass are functionally equivalent in this connector context. Contact finish (gold plating) provides the primary corrosion protection regardless of base material.

Q: Does packaging format (Bag versus Tray) affect connector performance?

A: Packaging format does not affect electrical or mechanical performance. Bag packaging (L77DFC37S) and Tray packaging (172-037-202R001) differ only in handling and storage presentation. Selection depends on assembly process requirements and inventory management practices.

Q: Are both parts compliant with current environmental regulations?

A: The L77DFC37S is RoHS Compliant. The 172-037-202R001 is ROHS3 Compliant. Both meet current environmental standards. The ROHS3 designation indicates compliance with the most recent revision of the Restriction of Hazardous Substances directive.