L77DC37S1AMN Equivalent & Substitute Parts

Part Overview

The L77DC37S1AMN is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC, featuring right-angle solder termination and female socket contacts. This connector is classified as Active product status and is RoHS compliant. The connector is designed for through-hole, right-angle mounting applications with a shell size 4 (DC, C) layout and supports a current rating of 7.5A at 300V.

Substitute parts are necessary when the primary part becomes unavailable, when design requirements necessitate alternative mounting configurations, or when legacy component specifications require compatibility with existing connector families. The substitute parts listed below provide functional equivalence within defined parameter constraints.

Substiute Parts

L77DC37S1AMN

Amphenol ICC (Commercial Products)In Stock: 908L77DC37S1AMN Datasheet

Current PartRFQ

173-E37-211R001

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

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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

Substitution eligibility for D-Sub receptacle connectors is determined by the following critical parameters:

Primary Compatibility Criteria:

• Connector type (Receptacle, Female Sockets)
• Number of positions (37)
• Number of rows (2)
• Shell size and connector layout (4 / DC, C)
• Mounting type (Through Hole, Right Angle)
• Termination method (Solder)
• Contact form (Machined)
• Flange feature configuration

Secondary Consideration Parameters:

• Current rating (minimum 5A across all substitutes; primary part rated 7.5A)
• Operating temperature range
• Contact finish (Gold across all parts)
• Material flammability rating (UL94 V-0)
• Backset spacing variations

All substitute parts maintain the core D-Sub 37-position receptacle configuration with right-angle solder termination. Variations exist in shell material finish (Yellow Chromate Plated vs. Tin Plated), backset spacing (0.283" to 0.370" vs. 0.406"), flange features (Unthreaded vs. Screwlock vs. Standard Screws), and compliance certifications (RoHS non-compliant vs. RoHS compliant).

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: L77DC37S1AMN (Amphenol ICC)

The L77DC37S1AMN is the recommended primary component for new designs. This part maintains Active product status, ensuring long-term availability and supply chain stability. The connector is RoHS compliant, meeting current environmental and regulatory requirements. The higher current rating of 7.5A and extended operating temperature range of -55°C to 125°C provide superior performance margins compared to substitute options. The tin-plated steel shell and specified gold contact finish thickness of 8.00µin provide enhanced corrosion resistance and contact reliability.

Substitute Selection Criteria:

All substitute parts are classified as Obsolete and RoHS non-compliant. Selection of substitute parts is appropriate only when:

1. Legacy System Compatibility: Existing equipment or systems require connector compatibility with NorComp 173-E or 174-E series connectors.

2. Backset Spacing Requirements: Applications with specific PCB layout constraints may require the reduced backset spacing of 173-E series (0.283") or the intermediate spacing of 174-E series (0.370") compared to the primary part (0.406").

3. Flange Feature Specifications: Applications requiring female screwlock (4-40) mating-side flanges necessitate 173-E37-211R141 or 174-E37-211R141. Applications requiring standard screw (4-40) mating-side flanges require 174-E37-211R241.

4. Current Rating Limitations: All substitute parts are rated at 5A maximum. Applications requiring current ratings above 5A must use the primary L77DC37S1AMN part.

5. Temperature Range Constraints: Applications operating below -50°C or above 100°C require the primary part, which supports -55°C to 125°C operation.

6. Regulatory Compliance: New designs subject to RoHS compliance requirements must use the L77DC37S1AMN. Substitute parts are non-compliant and unsuitable for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the NorComp 173-E37-211R001 directly replace the L77DC37S1AMN?

A: The 173-E37-211R001 maintains the same 37-position D-Sub receptacle configuration with right-angle solder termination. However, critical differences exist: the substitute part has a reduced current rating (5A vs. 7.5A), narrower operating temperature range (-50°C to 100°C vs. -55°C to 125°C), reduced backset spacing (0.283" vs. 0.406"), and is RoHS non-compliant. Direct replacement is possible only in applications where these parameter reductions are acceptable.

Q: What is the significance of backset spacing differences?

A: Backset spacing defines the distance from the connector mounting plane to the rear of the connector body. The primary part (L77DC37S1AMN) has 0.406" backset spacing. NorComp 173-E series parts have 0.283" spacing, and 174-E series parts have 0.370" spacing. These differences affect PCB layout, component clearances, and mounting bracket compatibility. Substitution requires verification that the alternative backset spacing accommodates existing mechanical constraints.

Q: Why are all NorComp substitute parts classified as Obsolete?

A: Obsolete product status indicates that the manufacturer has discontinued production and support for these parts. While inventory may remain available from distributors, long-term availability is not guaranteed. New designs should specify the Active L77DC37S1AMN to ensure supply chain continuity and manufacturer support.

Q: What is the difference between Female Screwlock and Standard Screws flange features?

A: The 173-E37-211R141 and 174-E37-211R141 feature Female Screwlock (4-40) flanges, which provide threaded receptacles on the mating side for secure screw attachment. The 174-E37-211R241 features Standard Screws (4-40) flanges, which use conventional screw holes. The 173-E37-211R001 has an Unthreaded Housing/Shell flange. Flange feature selection depends on the mating connector type and mechanical assembly requirements.

Q: Are the substitute parts suitable for new product designs?

A: No. All substitute parts are Obsolete and RoHS non-compliant. New product designs must specify the L77DC37S1AMN, which is Active and RoHS compliant. Substitute parts are appropriate only for legacy system maintenance, repair, or retrofit applications where compatibility with existing NorComp connectors is required.

Q: What is the impact of contact finish thickness differences?

A: The primary part specifies 8.00µin (0.203µm) gold contact finish thickness, providing a defined plating specification. All substitute parts specify Flash gold finish, which indicates a minimal, unspecified plating thickness. Flash finishes provide basic corrosion protection but offer less contact durability and wear resistance compared to specified thickness plating. Applications requiring high-reliability contacts should use the primary part.

Q: Can the 5A-rated substitute parts be used in 7.5A applications?

A: No. The substitute parts are rated for maximum 5A continuous current. Using these parts in applications requiring 7.5A operation exceeds the component rating and creates risk of thermal damage, contact degradation, and connector failure. The L77DC37S1AMN must be used for applications requiring 7.5A current capacity.

Q: What compliance certifications apply to each part?

A: The L77DC37S1AMN is RoHS compliant and REACH unaffected. All substitute parts are RoHS non-compliant and REACH unaffected. Both the primary part and substitutes carry EAR99 ECCN classification and 8536.69.4040 HTSUS code. Applications subject to RoHS regulations must use the primary part.