L77DCF37S D-Sub 37 Position Receptacle Connector

Part Overview

The L77DCF37S is a 37 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) mounting applications. The part is currently in active product status with 822 units in stock.

Substitute parts become necessary when the original manufacturer discontinues production, when alternative mounting configurations are required for specific applications, or when inventory availability from the primary supplier is limited. The L77DCF37S has one identified substitute part that maintains functional compatibility while offering different mechanical characteristics.

Substiute Parts

L77DCF37S

Amphenol ICC (Commercial Products)In Stock: 871L77DCF37S Datasheet

Current PartRFQ

172-037-202R001

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the L77DCF37S is determined by the following critical parameters that must remain consistent:

Core Compatibility Parameters:

• Connector type: Receptacle, Female Sockets
• Number of positions: 37
• Number of rows: 2
• Shell size and layout: 4 (DC, C)
• Termination method: Solder Cup
• Contact material: Brass
• Contact finish: Gold
• Shell material: Steel, Tin Plated
• Dielectric material: Glass-filled thermoplastic

Parameters Permitting Variation:

• Mounting type (free hanging vs. panel mount)
• Current rating (within acceptable operational limits)
• Operating temperature range (within application requirements)
• Manufacturer and product series
• Product status (active vs. obsolete)
• Packaging format (bag vs. tray)

The identified substitute part 172-037-202R001 maintains all core compatibility parameters while differing in mounting configuration and electrical ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: L77DCF37S

The L77DCF37S is the recommended primary component for new designs and procurement. This part maintains active product status with Amphenol ICC, ensuring long-term availability and supply chain stability. The connector provides a 300V voltage rating and 7.5A current capacity, supporting a wider range of applications. The operating temperature range of -55°C to 125°C accommodates demanding environmental conditions. RoHS compliance status confirms regulatory alignment for commercial and industrial applications.

Substitute Selection: 172-037-202R001

The 172-037-202R001 from NorComp Inc. serves as a functional substitute when panel mount configuration is required instead of free hanging (in-line) mounting. This part is currently obsolete, limiting its suitability for new designs. However, it maintains electrical and mechanical compatibility through identical connector type, position count, shell size, and termination method.

Critical Differences Affecting Selection:

The 172-037-202R001 operates at a reduced current rating of 5A compared to the L77DCF37S at 7.5A. Applications requiring current levels between 5A and 7.5A must use the L77DCF37S. The operating temperature range of the substitute (-50°C to 100°C) is narrower than the primary part, restricting use in extreme cold environments below -50°C or sustained high temperatures above 100°C.

The contact finish thickness differs between parts: the L77DCF37S specifies 8.00µin (0.203µm) while the substitute provides flash plating. This variation may affect long-term contact reliability in high-cycle mating applications.

Frequently Asked Questions (FAQ)

Q: Can the 172-037-202R001 be used as a direct replacement for the L77DCF37S in all applications?

A: No. The 172-037-202R001 differs in mounting type (panel mount vs. free hanging), current rating (5A vs. 7.5A), and operating temperature range (-50°C to 100°C vs. -55°C to 125°C). Substitution is only valid when the application accommodates panel mounting, operates within the lower current and temperature limits, and the part's obsolete status is acceptable.

Q: What does "obsolete" product status mean for the 172-037-202R001?

A: Obsolete status indicates that NorComp Inc. has discontinued manufacturing this part. While existing inventory may be available from distributors, long-term supply cannot be guaranteed. New designs should not incorporate obsolete parts unless no alternative exists and inventory commitments are secured.

Q: Are both connectors RoHS compliant?

A: Yes. The L77DCF37S is RoHS Compliant, and the 172-037-202R001 is ROHS3 Compliant. Both meet regulatory requirements for hazardous substance restrictions in commercial and industrial applications.

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

A: The L77DCF37S uses thermoplastic with glass fill, while the 172-037-202R001 uses polybutylene terephthalate (PBT) with glass fill. Both are glass-filled thermoplastics suitable for D-Sub connectors. The specific material difference does not affect functional compatibility but may influence mechanical properties and environmental resistance in specific conditions.

Q: How does the contact finish thickness affect connector performance?

A: The L77DCF37S specifies 8.00µin (0.203µm) gold plating, while the 172-037-202R001 provides flash plating. Thicker gold plating generally provides enhanced durability in high-cycle mating environments and improved corrosion resistance. Flash plating is thinner and suitable for lower-cycle applications. Selection depends on the expected number of mating cycles and environmental exposure.

Q: Can I use the 172-037-202R001 in applications requiring 7.5A current?

A: No. The 172-037-202R001 is rated for 5A maximum current. Using it in applications requiring 7.5A exceeds the part's electrical specification and creates a reliability risk. The L77DCF37S must be used for applications requiring the full 7.5A capacity.

Q: What packaging formats are available?

A: The L77DCF37S is supplied in bag packaging, while the 172-037-202R001 is supplied in tray packaging. Packaging format does not affect electrical or mechanical compatibility but may influence handling, storage, and inventory management procedures.