L77DC37SAJ4 Equivalent & Substitute Parts Reference

Part Overview

The L77DC37SAJ4 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 with full RoHS compliance and unlimited moisture sensitivity rating. The part is designed for applications requiring 37-pin D-Sub connectivity with through-hole, right-angle mounting configuration.

Substitute parts become necessary when the L77DC37SAJ4 reaches end-of-life status, inventory depletion occurs, or when design requirements permit alternative mechanical or electrical configurations. The substitute parts listed maintain core functional compatibility while differing in specific parameters such as shell finish, current rating, operating temperature range, and compliance status.

Substiute Parts

L77DC37SAJ4

Amphenol ICC (Commercial Products)In Stock: 1068L77DC37SAJ4 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

SimilarRFQ

174-E37-211R141

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

SimilarRFQ

174-E37-211R241

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77DC37SAJ4 is determined by the following critical parameters:

Core Compatibility Parameters (Must Match):

• Connector Type: Receptacle, Female Sockets
• Number of Positions: 37
• Number of Rows: 2
• Shell Size, Connector Layout: 4 (DC, C)
• Mounting Type: Through Hole, Right Angle
• Termination: Solder
• Material Flammability Rating: UL94 V-0

Allowable Variation Parameters (May Differ):

• Current Rating: Substitute parts rated at 5A are acceptable for applications not requiring the full 7.5A capacity
• Operating Temperature Range: Substitute parts with -50°C ~ 100°C range are acceptable for applications within this narrower window
• Shell Material Finish: Yellow Chromate Plated finish acceptable as alternative to Tin Plated
• Contact Finish Thickness: Flash acceptable as alternative to 8.00µin
• Flange Feature: Variations in screwlock configuration or mounting bracket design permitted
• RoHS Status: Non-compliant substitutes acceptable only when regulatory requirements do not mandate RoHS compliance
• Product Status: Obsolete parts acceptable for legacy system maintenance and repair applications

The four substitute parts (173-E37-211R001, 173-E37-211R141, 174-E37-211R141, 174-E37-211R241) all satisfy core compatibility requirements while differing in one or more allowable variation parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: L77DC37SAJ4

The L77DC37SAJ4 remains the preferred component for new designs and applications requiring active product status, full RoHS compliance, and extended operating temperature range (-55°C ~ 125°C). The higher current rating of 7.5A and specified voltage rating of 300V provide design margin for demanding applications. Tin-plated steel shell finish and 8.00µin gold contact finish thickness offer enhanced corrosion resistance and contact reliability.

Secondary Selection: 174-E37-211R141 or 174-E37-211R241

These NorComp 174-E series parts are suitable for legacy system maintenance and repair applications where the L77DC37SAJ4 is unavailable. Both parts maintain the larger 0.370" (9.40mm) backset spacing, which may align with existing PCB layouts designed for 174-E series connectors. The 174-E37-211R141 features female screwlock mating-side configuration, while 174-E37-211R241 provides standard screw configuration. Selection between these two depends on existing mating connector specifications. RoHS non-compliance status requires verification against applicable regulatory requirements before deployment.

Tertiary Selection: 173-E37-211R001 or 173-E37-211R141

These NorComp 173-E series parts are acceptable only for applications with relaxed electrical and thermal requirements. The reduced current rating of 5A and narrower operating temperature range (-50°C ~ 100°C) limit applicability to lower-power, temperature-controlled environments. The 0.283" (7.20mm) backset spacing differs from both the main part and 174-E series, requiring PCB layout verification. The 173-E37-211R001 provides unthreaded housing configuration, while 173-E37-211R141 includes female screwlock mating-side feature. RoHS non-compliance status requires regulatory verification.

Compliance Considerations

All substitute parts carry RoHS non-compliant status. Applications subject to RoHS Directive 2011/65/EU or equivalent regulations must retain the L77DC37SAJ4. Legacy system maintenance and repair operations may proceed with substitute parts only when regulatory exemptions apply or when the equipment itself predates RoHS requirements.

Frequently Asked Questions (FAQ)

Q: Can 173-E37-211R001 directly replace L77DC37SAJ4 in existing designs?

A: Direct replacement is not recommended. While both connectors maintain 37-position, 2-row D-Sub configuration with solder termination, the 173-E37-211R001 differs in backset spacing (0.283" vs. 0.319"), current rating (5A vs. 7.5A), operating temperature range (-50°C ~ 100°C vs. -55°C ~ 125°C), and RoHS compliance status. PCB layout verification and electrical load assessment are required before substitution.

Q: What is the significance of backset spacing differences between substitute parts?

A: Backset spacing determines the distance from the connector mounting surface to the contact plane. The L77DC37SAJ4 specifies 0.319" (8.10mm), while 173-E series parts specify 0.283" (7.20mm) and 174-E series parts specify 0.370" (9.40mm). These differences affect PCB layout compatibility and mating connector alignment. Substitution requires verification that existing PCB footprints and mating connectors accommodate the alternative spacing.

Q: Are the NorComp substitute parts electrically equivalent to the Amphenol L77DC37SAJ4?

A: Electrical equivalence is partial. All parts maintain 37-position, 2-row configuration with gold-plated contacts and UL94 V-0 flammability rating. However, the L77DC37SAJ4 specifies 7.5A current rating and 300V voltage rating, while all NorComp substitutes specify 5A current rating with unspecified voltage rating. Applications requiring the full 7.5A capacity or 300V rating cannot use NorComp substitutes. Contact finish thickness also differs (8.00µin vs. Flash), affecting long-term contact reliability in corrosive environments.

Q: What does "Obsolete" product status mean for the substitute parts?

A: Obsolete status indicates that the manufacturer has discontinued production and removed the part from active inventory. While substitute parts may be available from remaining stock or secondary distributors, future availability is not guaranteed. Obsolete parts are suitable for maintenance and repair of existing equipment but should not be specified for new designs or long-term production programs.

Q: Can I use 174-E37-211R141 in place of 174-E37-211R241?

A: Both parts are mechanically and electrically equivalent with identical electrical specifications (5A current rating, -50°C ~ 125°C operating temperature, 0.370" backset spacing). The primary difference is flange feature configuration: 174-E37-211R141 provides female screwlock (4-40) mating-side feature, while 174-E37-211R241 provides standard screw (4-40) configuration. Selection depends on the mating connector specification. Verify that the mating connector matches the selected flange feature type before substitution.

Q: Why do substitute parts have unspecified voltage ratings?

A: Voltage rating specifications are provided only for the L77DC37SAJ4 (300V). NorComp substitute parts do not include voltage rating data in the provided specifications. Applications requiring verified voltage rating specifications must retain the L77DC37SAJ4 or contact the manufacturer for complete electrical specifications of substitute parts.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other jurisdictions under Directive 2011/65/EU. The L77DC37SAJ4 is RoHS compliant and suitable for all regulated markets. All NorComp substitute parts are RoHS non-compliant and may only be used in applications exempt from RoHS requirements, such as military equipment, aerospace applications, or legacy system maintenance where regulatory exemptions apply. Verify applicable regulatory requirements before selecting non-compliant substitutes.