L77DCH37SAM4B D-Sub 37 Position Receptacle Connector

Part Overview

The L77DCH37SAM4B is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets with right-angle solder termination and board-side flange mounting. The product maintains active status and is RoHS compliant, making it suitable for applications requiring standard D-Sub connectivity with solder-based assembly.

Finding alternative models becomes necessary when component availability changes, supply chain constraints emerge, or design flexibility is required for multi-sourcing strategies. Substitute parts must maintain compatibility across electrical ratings, mechanical mounting configurations, and physical dimensions to ensure drop-in replacement capability.

Substiute Parts

L77DCH37SAM4B

Amphenol ICC (Commercial Products)In Stock: 772L77DCH37SAM4B 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

Substitute parts for the L77DCH37SAM4B must satisfy the following critical parameters:

Mandatory Matching Parameters:

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

Allowable Parameter Variations:

• Mounting Type: May vary between Through Hole, Panel Mount, and Right Angle configurations
• Flange Feature: May vary (Board Side, Housing/Shell, Mating Side options acceptable)
• Shell Material, Finish: Steel with alternative plating finishes (Tin Plated or Yellow Chromate Plated)
• Current Rating: May be lower (substitute parts rated at 5A are acceptable for applications not requiring 7.5A capacity)
• Voltage Rating: Lower ratings acceptable if application requirement permits
• Backset Spacing: May vary within mechanical tolerance ranges
• Contact Finish Thickness: Flash plating acceptable as alternative to thick plating
• Operating Temperature Range: Narrower ranges acceptable if application operates within specified bounds
• RoHS Status: Non-compliant substitutes permitted only when RoHS compliance is not a regulatory requirement

The four identified substitute parts (173-E37-211R001, 173-E37-211R141, 174-E37-211R141, 174-E37-211R241) share the core D-Sub 37-position receptacle architecture with the primary part and fulfill the mandatory matching criteria. All alternatives are manufactured by NorComp Inc. and maintain identical connector style, position count, row configuration, shell size, and termination method.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: L77DCH37SAM4B (Amphenol ICC)

The L77DCH37SAM4B remains the recommended choice for new designs and production. It maintains active product status, RoHS compliance certification, and the highest current rating (7.5A) among available options. The tin-plated steel shell and thicker gold contact plating (8.00µin) provide superior corrosion resistance and long-term contact reliability. The extended operating temperature range (-55°C to 125°C) supports applications across industrial and harsh environments.

Secondary Options: NorComp Inc. Substitutes (173-E37 and 174-E37 Series)

All four NorComp substitutes maintain the core 37-position D-Sub receptacle architecture and satisfy fundamental electrical and mechanical compatibility requirements. However, these parts carry obsolete product status, indicating discontinued manufacturing and limited long-term availability. RoHS non-compliance restricts their use in applications subject to European Union regulations or customer-mandated RoHS requirements.

Selection of NorComp alternatives is appropriate only for:

• Retrofit and legacy system maintenance where component matching with existing installations is required
• Applications with reduced current demands (5A maximum rating versus 7.5A)
• Non-regulated markets without RoHS compliance mandates
• Situations where inventory availability takes priority over long-term supply assurance

Backset Spacing Consideration:

Significant variation exists in backset spacing among substitute options. The main part specifies 0.590" (14.99mm), while NorComp 173-E37 variants reduce this to 0.283" (7.20mm), and NorComp 174-E37 variants specify 0.370" (9.40mm). Backset spacing affects board layout and connector mounting clearance. Substitution with different backset spacing requires mechanical verification against printed circuit board design constraints.

Temperature Range Limitation:

NorComp substitutes operate within -50°C to 100°C bounds, narrower than the Amphenol part's -55°C to 125°C range. Applications requiring full extended temperature capability mandate the primary part selection.

Frequently Asked Questions (FAQ)

Q: Can NorComp 173-E37 or 174-E37 connectors directly replace the L77DCH37SAM4B in new production?

A: No. The L77DCH37SAM4B is the recommended choice for new production. NorComp alternatives are obsolete products with RoHS non-compliance and lower current ratings (5A versus 7.5A). Substitution is limited to legacy system maintenance or applications with relaxed electrical and regulatory requirements.

Q: What is the significance of backset spacing differences?

A: Backset spacing defines the distance from the connector mounting plane to the contact engagement point. The main part specifies 0.590" (14.99mm), while substitutes range from 0.283" to 0.370". Different backset spacing affects PCB layout, mounting bracket design, and mating connector alignment. Mechanical compatibility must be verified before substitution.

Q: Are the NorComp connectors electrically compatible with the Amphenol L77DCH37SAM4B?

A: NorComp substitutes maintain the same 37-position D-Sub receptacle interface and pin configuration, ensuring basic electrical connectivity. However, the 5A current rating of NorComp parts is lower than the Amphenol part's 7.5A rating. Applications exceeding 5A current demand require the primary Amphenol part. The narrower operating temperature range (-50°C to 100°C versus -55°C to 125°C) may also limit suitability in extreme temperature environments.

Q: Why do some substitute parts lack voltage rating specifications?

A: NorComp technical data provided does not include explicit voltage ratings for the 173-E37 and 174-E37 series substitutes. Both series share the same UL94 V-0 flammability rating and general design architecture as the main part, supporting standard industrial voltage levels. However, the absence of published voltage specifications presents an incomplete technical record for critical high-voltage applications. The main Amphenol part's 300V rating provides documented electrical safety assurance.

Q: How does the shell material finish differ between options?

A: The main Amphenol part features tin-plated steel, offering consistent corrosion resistance and reflow compatibility. NorComp substitutes use yellow chromate plating, an older surface treatment providing basic corrosion protection suitable for indoor industrial environments. Tin plating generally provides superior performance in moisture-prone or chemically corrosive operating conditions. Applications in harsh or marine environments favor the tin-plated Amphenol part.

Q: Are contact finish differences significant?

A: The main part specifies 8.00µin (0.203µm) gold plating, while NorComp substitutes feature flash gold plating. Thick gold plating (8.00µin) provides extended contact life, reduced wear, and improved reliability in high-mating-cycle applications. Flash plating offers cost reduction and adequate performance for lower-cycle or static applications. Substitution should account for expected connector mating frequency and contact reliability requirements.

Q: What does "RoHS non-compliant" mean for the NorComp parts?

A: RoHS (Restriction of Hazardous Substances) non-compliance indicates the part may contain restricted materials such as lead, cadmium, or hexavalent chromium. These parts are prohibited for sale or use within European Union markets and many regulated industries. Substitution with RoHS non-compliant parts is permissible only in unregulated markets or where customer requirements explicitly permit non-RoHS alternatives. The main Amphenol part's RoHS compliance eliminates regulatory restrictions.

Q: Why are all substitute parts listed as "Obsolete"?

A: Obsolete designation indicates NorComp has discontinued manufacturing these connector models. While inventory may be available from distributors, future procurement cannot be assured. New production designs should utilize the active Amphenol L77DCH37SAM4B to ensure long-term supply chain reliability and component consistency across manufacturing runs.

Q: Can dielectric material differences affect performance?

A: The main Amphenol part uses thermoplastic with glass filling, while NorComp substitutes employ polyamide (PA6T) nylon. Both materials meet UL94 V-0 flammability requirements and support standard electrical insulation demands. Dielectric material variations may affect mechanical strength, moisture absorption, and long-term dimensional stability. For applications with stringent mechanical durability or moisture resistance requirements, the glass-filled thermoplastic of the main part provides enhanced performance characteristics.

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