L77DC37ST D-Sub 37 Position Receptacle Connector Equivalent & Substitute Parts

Part Overview

The L77DC37ST is a 37 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets, vertical through-hole mounting, and solder termination. The part is currently active in production with 770 pieces in stock.

D-Sub connectors are standard interface components used in industrial, telecommunications, and data transmission applications. Equivalent and substitute parts become necessary when the primary part is unavailable, when design requirements change, or when alternative sourcing is required to meet supply chain objectives.

Substiute Parts

L77DC37ST

Amphenol ICC (Commercial Products)In Stock: 840L77DC37ST Datasheet

Current PartRFQ

172-E37-213R001

NorComp Inc.In Stock: 1578172-E37-213R001 Datasheet

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172-E37-213R011

NorComp Inc.In Stock: 1242172-E37-213R011 Datasheet

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A-DF 37 PP/Z

Assmann WSW ComponentsIn Stock: 996A-DF 37 PP/Z Datasheet

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D37S24A4GL00LF

Amphenol ICC (FCI)In Stock: 1101D37S24A4GL00LF Datasheet

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D37S24A4GX00LF

Amphenol ICC (FCI)In Stock: 1575D37S24A4GX00LF Datasheet

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D37S24A4PL00LF

Amphenol ICC (FCI)In Stock: 872D37S24A4PL00LF Datasheet

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DC37S364TLF

Amphenol ICC (FCI)In Stock: 1134DC37S364TLF Datasheet

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DCM37S300N

Amphenol ICC (FCI)In Stock: 749DCM37S300N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of D-Sub 37 position receptacle connectors is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

• 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)
• Termination method (Solder)

Electrical Compatibility Parameters:

• Voltage rating must equal or exceed 300V
• Current rating must equal or exceed 7.5A per contact
• Operating temperature range must encompass -55°C to 125°C

Mechanical and Material Parameters:

• Contact finish (Gold plated)
• Flange feature configuration
• Shell material composition

Substitute parts are grouped into two categories: direct equivalents that maintain all critical parameters, and functional alternatives that meet electrical and mechanical requirements while differing in specific material finishes or mounting configurations.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The D37S24A4GL00LF and D37S24A4GX00LF from Amphenol ICC (FCI) Delta D series are functionally equivalent to the L77DC37ST. Both parts maintain the same electrical specifications (300V, -55°C to 125°C operating range), connector configuration (37 position, 2 row, DC/C layout), and mounting method (through-hole solder). Both are RoHS compliant and active in production. The primary difference is flange configuration: D37S24A4GL00LF features M3 mounting holes, while D37S24A4GX00LF features 4-40 mounting holes. Current rating is 5A per contact, which is lower than the L77DC37ST specification of 7.5A.

The DC37S364TLF from Amphenol ICC (FCI) D series maintains identical electrical ratings (300V, -55°C to 125°C), connector layout, and mounting configuration. This part is RoHS compliant and active. Current rating is 5A per contact.

Functional Alternatives (Limited Substitution):

The D37S24A4PL00LF from Amphenol ICC (FCI) Delta D series meets electrical and mechanical requirements with identical voltage, temperature range, and connector specifications. Current rating is 5A per contact. This part is RoHS compliant and active.

The A-DF 37 PP/Z from Assmann WSW Components meets the 37 position, 2 row, DC/C layout requirement with through-hole solder termination. However, this part has reduced electrical ratings: 250V voltage rating and 3A current rating. Operating temperature range is -20°C to 105°C, which does not encompass the full -55°C to 125°C specification of the L77DC37ST. This part is ROHS3 compliant and active.

The 172-E37-213R001 and 172-E37-213R011 from NorComp Inc. are panel mount variants with 37 positions, 2 rows, and DC/C layout. Both feature 5A current rating and are ROHS3 compliant. Voltage rating is not specified. Operating temperature range is -50°C to 100°C, which does not fully encompass the L77DC37ST specification. The 172-E37-213R001 features unthreaded housing, while 172-E37-213R011 features board-side 4-40 mounting. These parts are suitable only when panel mounting is required.

Non-Recommended Substitutes:

The DCM37S300N from Amphenol ICC (FCI) DM HE508 series is marked as obsolete and should not be selected for new designs or ongoing production applications.

Frequently Asked Questions (FAQ)

Q: Can the D37S24A4GL00LF replace the L77DC37ST in all applications?

A: The D37S24A4GL00LF is mechanically and electrically compatible for most applications. Both parts maintain 300V voltage rating, -55°C to 125°C operating temperature range, and identical connector configuration (37 position, 2 row, DC/C layout). The primary difference is current rating: D37S24A4GL00LF is rated at 5A per contact versus L77DC37ST at 7.5A. Applications requiring the full 7.5A current capacity must verify that the substitute part's 5A rating is sufficient for the circuit design.

Q: What is the difference between the D37S24A4GL00LF and D37S24A4GX00LF?

A: Both parts are identical in electrical specifications, connector configuration, and material composition. The difference is in the flange feature: D37S24A4GL00LF has M3 mounting holes, while D37S24A4GX00LF has 4-40 mounting holes. Selection depends on the mechanical mounting interface of the application.

Q: Why do the NorComp 172-E37 series parts have panel mount options?

A: The 172-E37-213R001 and 172-E37-213R011 are designed for panel-mounted applications where the connector is mounted directly to an enclosure or panel. The L77DC37ST is designed for through-hole PCB mounting. These NorComp parts are substitutes only when the application requires panel mounting rather than PCB mounting.

Q: Is the A-DF 37 PP/Z from Assmann WSW a suitable substitute?

A: The A-DF 37 PP/Z meets the basic connector configuration requirements (37 position, 2 row, DC/C layout, through-hole solder termination). However, it has reduced electrical ratings: 250V versus 300V, and 3A versus 7.5A current capacity. Operating temperature range is -20°C to 105°C, which does not encompass the full -55°C to 125°C specification. This part is suitable only for applications with lower electrical demands and narrower temperature requirements.

Q: What does RoHS compliance mean for connector selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates that the part does not contain restricted materials such as lead, mercury, cadmium, or hexavalent chromium. The L77DC37ST is RoHS compliant. Most substitute parts listed are either RoHS compliant or ROHS3 compliant, which indicates compliance with the updated RoHS 3 directive. For applications subject to RoHS regulations, select only parts marked as RoHS compliant or ROHS3 compliant.

Q: Can I use the DCM37S300N as a substitute?

A: No. The DCM37S300N is marked as obsolete and should not be used for new designs or ongoing production. Obsolete parts may have limited availability and no manufacturer support.

Q: What is the significance of contact material differences (Brass vs. Phosphor Bronze)?

A: The L77DC37ST uses brass contacts, while several substitute parts use phosphor bronze. Both materials provide adequate electrical conductivity and are suitable for signal transmission in D-Sub connectors. The choice between materials affects mechanical durability and wear characteristics. Phosphor bronze generally offers superior spring properties and wear resistance. For applications with frequent mating cycles, phosphor bronze contacts may provide longer service life.

Q: Are there any REACH compliance considerations?

A: The L77DC37ST is marked as REACH Unaffected. Most substitute parts are also REACH Unaffected, with the exception of D37S24A4GX00LF, which is marked as REACH Affected. For applications subject to REACH regulations, verify the specific regulatory requirements and select parts accordingly.