L77DCH37ST 37 Position D-Sub Receptacle Connector

Part Overview

The L77DCH37ST is a 37 Position D-Sub Receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female socket contacts, through-hole solder termination, and board-side mounting with 4-40 flange. The product is active and RoHS compliant. Substitute parts may be required due to availability constraints, specific application mounting requirements, or thermal operating range specifications.

Substiute Parts

L77DCH37ST

Amphenol ICC (Commercial Products)In Stock: 1055L77DCH37ST 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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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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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is based on the following core parameters that must match or remain within acceptable tolerance:

• Number of Positions: 37 (all substitutes must maintain this specification)
• Number of Rows: 2 (fixed for D-Sub size 4 layout)
• Connector Type: Receptacle, Female Sockets (functionally equivalent)
• Shell Size/Layout: 4 (DC, C) (mechanical and electrical compatibility)
• Termination Method: Solder (installation compatibility)
• Contact Type: Signal (application requirement)

Secondary parameters that may vary within electrical and thermal limits:

• Shell Material/Finish: Steel with various plating options (tin plated, nickel plated, tin-nickel)
• Contact Material: Brass or copper alloy variants
• Current Rating: 3A to 7.5A per contact (application dependent)
• Voltage Rating: 250V to 300V (within industrial signal standards)
• Operating Temperature: -55°C to 125°C envelope (variations within this range acceptable)
• Mounting: Through hole (board-mount and panel-mount variants acceptable)
• Flange Type: Board-side, housing-side, or unthreaded options (mechanical accommodation dependent)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility)

Parts D37S24A4GX00LF and D37S24A4PL00LF from Amphenol ICC (FCI) share identical electrical specifications with the main part, including voltage rating (300V), operating temperature range (-55°C ~ 125°C), and RoHS compliance. Both utilize the Delta D series with board lock feature and phosphor bronze contact material. Selection between these two is determined by flange accommodation: GX00LF features 4-40 flange, while PL00LF features M3 flange.

Functionally Compatible Substitutes

DC37S364TLF is electrically compatible with matching voltage (300V) and temperature range (-55°C ~ 125°C). This connector maintains RoHS compliance and uses tin-plated steel shell with copper alloy contacts. Current rating per contact is 5A, slightly below the main part specification of 7.5A.

Mounting-Dependent Alternatives

Parts 172-E37-213R001 and 172-E37-213R011 from NorComp Inc. incorporate panel-mount capability in addition to through-hole termination, extending application flexibility. These connectors reduce operating temperature range to -50°C ~ 100°C and lower current rating to 5A. Both achieve ROHS3 compliance. The primary difference is flange type: 213R001 features unthreaded housing shell, while 213R011 includes 4-40 board-side flange.

Lower-Specification Alternative

A-DF 37 PP/Z from Assmann WSW Components operates at reduced current rating (3A), voltage rating (250V), and temperature range (-20°C ~ 105°C). This connector is suitable for applications with lower electrical demands and reduced thermal requirements. ROHS3 compliance and tin-plated steel shell are provided.

Frequently Asked Questions (FAQ)

Q: Can D37S24A4GX00LF replace L77DCH37ST directly? A: Yes. Both connectors share identical electrical specifications (300V voltage rating, -55°C to 125°C operating range), RoHS compliance status, and 37-position 2-row D-Sub size 4 layout. The flange type (4-40 board-side) matches the main part. Physical and electrical compatibility is complete.

Q: What is the primary difference between 172-E37-213R001 and 172-E37-213R011? A: Both are NorComp Inc. 37-position D-Sub connectors with panel-mount and through-hole capability. The distinction is flange configuration: 213R001 uses unthreaded housing shell, while 213R011 incorporates 4-40 board-side flange matching the main part mounting style.

Q: Is A-DF 37 PP/Z suitable for all applications? A: No. The A-DF 37 PP/Z operates at reduced electrical specifications: 3A current rating versus 7.5A for the main part, and 250V versus 300V. Operating temperature range is also restricted to -20°C ~ 105°C. Selection is limited to applications with correspondingly reduced power and thermal requirements.

Q: Which substitutes maintain the full operating temperature range? A: D37S24A4GX00LF, D37S24A4PL00LF, and DC37S364TLF all match the -55°C to 125°C operating range. Parts 172-E37-213R001, 172-E37-213R011, and A-DF 37 PP/Z operate within reduced temperature envelopes and are unsuitable for applications requiring the full specification range.

Q: Are voltage ratings interchangeable? A: The main part and most substitutes (D37S24A4GX00LF, D37S24A4PL00LF, DC37S364TLF) are rated for 300V, ensuring electrical compatibility. Parts 172-E37-213R001 and 172-E37-213R011 do not specify voltage rating. A-DF 37 PP/Z is rated for 250V, which is below the main part specification. Voltage-dependent applications require 300V-rated connectors.

Q: What determines flange compatibility? A: The mechanical flange type must accommodate the board-mounting hardware specified in the design. Options include 4-40 board-side flange (L77DCH37ST, 172-E37-213R011, D37S24A4GX00LF), M3 housing flange (D37S24A4PL00LF), or unthreaded housing shell (172-E37-213R001, A-DF 37 PP/Z, DC37S364TLF). PCB layout and mounting hardware must be verified before selection.

Q: Is RoHS compliance uniform across all parts? A: No. The main part and D37S24A4PL00LF, DC37S364TLF are RoHS compliant. Parts 172-E37-213R001, 172-E37-213R011, and A-DF 37 PP/Z are ROHS3 compliant. Both RoHS and ROHS3 are current compliance standards; however, application-specific requirements may mandate one standard over the other.