L77DFC37P D-Sub Connector - Equivalent & Substitute Parts

Part Overview

The L77DFC37P is a 37-position D-Sub plug connector with male pins, designed for panel mount applications. Manufactured by Amphenol ICC (Commercial Products), this connector is classified as obsolete. Given its obsolete status, identifying equivalent and substitute parts is essential for system maintenance, legacy equipment repair, and design continuity in applications where this connector remains in service.

Substiute Parts

L77DFC37P

Amphenol ICC (Commercial Products)In Stock: 928L77DFC37P Datasheet

Current PartRFQ

L717DFC37P

Amphenol ICC (Commercial Products)In Stock: 1321L717DFC37P Datasheet

MFR RecommendedRFQ

172-037-102R001

NorComp Inc.In Stock: 1058172-037-102R001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the L77DFC37P is determined by strict adherence to the following electrical and mechanical parameters:

• Connector Style and Type: D-Sub plug with male pins
• Position Count: 37 positions in 2-row configuration
• Shell Size: Size 4 (DC, C) layout
• Mounting Configuration: Panel mount with unthreaded housing/shell
• Termination Method: Solder cup contacts
• Contact Specifications: Machined brass contacts with gold finish
• Electrical Ratings: Minimum 7.5A current rating and 300V voltage rating
• Environmental Compliance: RoHS compliance for regulated applications

The identified substitutes are evaluated based on their ability to maintain functional compatibility within these parameters while accounting for product status and availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: L717DFC37P

The L717DFC37P (Amphenol ICC) is the manufacturer-recommended substitute for the L77DFC37P. Both connectors share identical mechanical and electrical characteristics, including 37-position capacity, panel mount configuration, and equivalent current and voltage ratings. The L717DFC37P holds active product status, ensuring continued availability and support. Both parts maintain RoHS compliance and MSL 1 rating. The primary operational difference is the temperature range: the L717DFC37P operates to 125°C versus the L77DFC37P's 155°C upper limit. Selection of L717DFC37P is appropriate for applications where the lower temperature ceiling does not present a constraint.

Alternative Substitute: 172-037-102R001

The 172-037-102R001 (NorComp Inc.) provides mechanical compatibility as a 37-position D-Sub plug with identical shell size and panel mount configuration. However, this part presents three specification limitations compared to the original: reduced current rating (5A versus 7.5A), unspecified voltage rating, and narrower operating temperature range (-50°C to 100°C). Additionally, both the main part and this substitute carry obsolete status. The 172-037-102R001 is suitable only for applications where current demand does not exceed 5A and operating temperatures remain within -50°C to 100°C limits.

Frequently Asked Questions (FAQ)

Q1: What makes L717DFC37P a direct substitute for L77DFC37P?

Both connectors share all critical mechanical and electrical specifications: 37-position capacity, shell size 4, panel mount design, solder cup termination, brass contacts with gold plating, steel tin-plated housing, 7.5A current rating, and 300V voltage rating. The L717DFC37P is the manufacturer-recommended replacement with active product status.

Q2: Can I use 172-037-102R001 as a substitute?

Mechanical compatibility exists, but functional limitations apply. The 172-037-102R001 is rated for maximum 5A current (versus 7.5A required) and operates only to 100°C maximum (versus 155°C for the original). This part is suitable only if your application's current requirement is below 5A and operating temperatures remain within -50°C to 100°C.

Q3: Why is operating temperature range important for substitution?

Operating temperature range defines the thermal envelope within which the connector maintains electrical and mechanical performance. The L77DFC37P operates from -55°C to 155°C, providing margin for extreme environment applications. The L717DFC37P's upper limit of 125°C may prove limiting in high-temperature installations. Selection depends on your equipment's thermal requirements.

Q4: What is the significance of current rating differences?

Current rating specifies the maximum current each contact can safely carry without excessive heating. The L77DFC37P and L717DFC37P both support 7.5A per contact. The 172-037-102R001 supports only 5A per contact. If your application requires current flow exceeding 5A through any contact, this part is unsuitable.

Q5: How do moisture sensitivity levels affect connector selection?

Moisture Sensitivity Level (MSL) describes the component's susceptibility to moisture absorption and the storage conditions required. Both Amphenol parts carry MSL 1 (Unlimited), indicating no special moisture control is required during storage or handling. The NorComp substitute lists MSL as Not Applicable, indicating alternative moisture management specifications.

Q6: Are there packaging differences between these parts?

Yes. The L77DFC37P comes without specified packaging information, L717DFC37P is supplied in bags, and 172-037-102R001 is supplied in trays. Packaging affects storage, handling, and inventory management but does not alter electrical or mechanical performance.

Q7: What does RoHS compliance mean for these connectors?

RoHS (Restriction of Hazardous Substances) compliance indicates the connector meets restrictions on lead, mercury, and other hazardous materials. Both Amphenol parts carry full RoHS Compliant status. The NorComp part carries ROHS3 Compliant status. All three parts satisfy RoHS requirements for use in regulated markets.