L77DFC37S1AMN

Part Overview

The L77DFC37S1AMN is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC, designed for panel mount, through-hole, right-angle solder termination applications. This connector features female sockets in a 2-row configuration with a 4 (DC, C) shell size layout. The component is currently in active production status with RoHS compliance and is suitable for applications requiring signal transmission at voltage ratings up to 300V and current ratings of 7.5A per contact.

Substitute parts are necessary when the original manufacturer discontinues production, when supply constraints occur, or when design requirements allow for compatible alternatives that meet equivalent electrical and mechanical specifications. Several equivalent D-Sub connectors from NorComp Inc. provide functional compatibility with specific operational parameter constraints that must be evaluated for application suitability.

Substiute Parts

L77DFC37S1AMN

Amphenol ICC (Commercial Products)In Stock: 1138L77DFC37S1AMN Datasheet

Current PartRFQ

173-E37-211R001

NorComp Inc.In Stock: 971173-E37-211R001 Datasheet

SimilarRFQ

173-E37-211R141

NorComp Inc.In Stock: 1384173-E37-211R141 Datasheet

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174-E37-211R141

NorComp Inc.In Stock: 953174-E37-211R141 Datasheet

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174-E37-211R241

NorComp Inc.In Stock: 993174-E37-211R241 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute part compatibility is determined by the following critical parameters: connector type (receptacle, female sockets), number of positions (37), shell size layout (4, DC, C), mounting configuration (panel mount, through-hole, right-angle solder), and flange feature design.

The NorComp Inc. substitute parts listed below maintain electrical compatibility for the core signal transmission function. However, significant operational parameter differences exist:

Current Rating Reduction: All NorComp substitutes operate at 5A maximum, compared to the 7.5A rating of the primary part. Applications requiring continuous current above 5A per contact cannot use these substitutes.

Voltage Rating Differences: NorComp parts do not list a voltage rating specification, whereas the L77DFC37S1AMN is rated for 300V. This parameter difference must be evaluated against application requirements.

Operating Temperature Range Limitation: NorComp substitutes are rated -50°C ~ 100°C, compared to the primary part's -55°C ~ 125°C range. High-temperature and extreme cold applications requiring the full operating range of the primary part are not suitable for NorComp substitutes.

RoHS Compliance: The primary part is RoHS compliant. All NorComp substitutes are RoHS non-compliant, which may restrict use in regulated applications or regions with RoHS requirements.

Backset Spacing Variation: NorComp 173-E series parts specify 0.283" (7.20mm) backset spacing, while 174-E series parts specify 0.370" (9.40mm). The primary part specifies 0.406" (10.30mm). These dimensional differences may require mechanical design adjustments for proper board layout and mounting bracket clearance.

Shell Plating Difference: The primary part features tin-plated steel shell finish, while all substitutes feature yellow chromate-plated steel. This affects corrosion resistance characteristics in different environmental conditions.

Parameter Comparison

Engineering Selection Recommendations

Primary Component (L77DFC37S1AMN): Selection is appropriate for new designs, production applications subject to RoHS regulations, and systems requiring the full specification envelope including 7.5A current rating, 300V voltage rating, and -55°C ~ 125°C operating temperature range.

NorComp 173-E37-211R001: Limited application due to unthreaded housing flange without mounting brackets and the obsolete product status. Not recommended for new designs. Suitable only for legacy system repairs where backset spacing of 0.283" (7.20mm) is compatible with existing board layouts and thermal requirements remain within -50°C ~ 100°C.

NorComp 173-E37-211R141: Obsolete status restricts application to legacy system repairs. Applicable where female screwlock flange feature and 0.283" (7.20mm) backset spacing match original design specifications. Mounting brackets are present. Not suitable for RoHS-regulated applications.

NorComp 174-E37-211R141: Obsolete status restricts application to legacy system repairs. Applicable where female screwlock flange feature, 0.370" (9.40mm) backset spacing, and mounting brackets align with original equipment design. Not suitable for RoHS-regulated applications.

NorComp 174-E37-211R241: Obsolete status restricts application to legacy system repairs. Applicable where standard screw flange feature, 0.370" (9.40mm) backset spacing, and mounting brackets match original design specifications. Not suitable for RoHS-regulated applications.

All NorComp substitutes present reduced electrical performance (5A maximum current rating) and restricted temperature operating range (-50°C ~ 100°C maximum). Applications requiring the full electrical specification of the primary component cannot use these substitutes.

Frequently Asked Questions (FAQ)

Q: Can NorComp parts substitute for the L77DFC37S1AMN in all applications?

A: No. All NorComp substitute parts operate at a maximum current rating of 5A, compared to the primary part's 7.5A rating. Applications requiring continuous current above 5A per contact require the primary component. Additionally, the operating temperature range is restricted to -50°C ~ 100°C for all substitutes versus -55°C ~ 125°C for the primary part.

Q: What is the significance of the backset spacing difference?

A: Backset spacing (0.283", 0.370", or 0.406") determines the distance from the panel mounting surface to the connector's rear contact access point. This dimension is critical for PCB layout, mounting bracket clearance, and cable routing. Substitution is only appropriate when the replacement part's backset spacing matches the original design specifications.

Q: Are all substitute parts compatible from a mating perspective?

A: Yes. All listed substitute parts maintain the same connector type (receptacle, female sockets), number of positions (37), and shell size layout (4, DC, C). This ensures compatibility with mating plug connectors designed for the L77DFC37S1AMN.

Q: Why is RoHS compliance important in selecting a substitute?

A: RoHS (Restriction of Hazardous Substances) compliance is mandatory for products sold in the European Union and is increasingly required by OEMs worldwide. The L77DFC37S1AMN is RoHS compliant. All NorComp substitutes are RoHS non-compliant, restricting their use in regulated applications, export markets, and many original equipment manufacturer supply chains.

Q: What is the difference between the flange features of the substitute parts?

A: The L77DFC37S1AMN features an unthreaded housing shell flange. The NorComp 173-E37-211R001 maintains an unthreaded flange without mounting brackets. The 173-E37-211R141 and 174-E37-211R141 feature female screwlock connectors (4-40 threads). The 174-E37-211R241 features standard screw mounting (4-40). Flange feature selection affects mechanical assembly approach and locking mechanism compatibility.

Q: What does "obsolete" product status indicate?

A: Obsolete status indicates that the manufacturer no longer produces the component. While existing inventory may be available through distributors, future availability is not guaranteed. Obsolete components present supply chain risk for long-term production applications. New designs should specify the active-status L77DFC37S1AMN component.

Q: How do shell plating differences affect performance?

A: The primary part features tin-plated steel shell finish; all substitutes feature yellow chromate-plated steel. Tin plating provides superior corrosion resistance in salt-spray and marine environments. Yellow chromate plating offers standard corrosion protection for general industrial environments. Environmental application requirements determine which finish is appropriate.

Q: Are contact finish thickness differences significant?

A: The primary part specifies 20.0µin (0.51µm) gold contact plating thickness; all substitutes specify flash thickness (minimal plating). Flash plating meets basic electrical contact requirements but provides reduced durability for high-cycle mating and contact resistance stability under thermal cycling. For applications requiring extended mating life or aggressive environmental conditions, the primary part's thicker plating is preferable.