L77SDCG37SOL2RM8 D-Sub 37 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L77SDCG37SOL2RM8 is a 37 position D-Sub receptacle connector manufactured by Amphenol ICC, featuring female sockets with vertical through-hole solder termination. This connector is classified as an active product with full RoHS compliance and unlimited moisture sensitivity level (MSL 1). The connector is designed for signal applications requiring a 250V rating and 3A current capacity across a 2-row, shell size 4 (DC, C) configuration.

Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when design specifications allow for compatible alternatives from qualified manufacturers. TE Connectivity AMP Connectors offers multiple AMPLIMITE HD-20 series alternatives that maintain mechanical and electrical compatibility while providing different flange configurations and current ratings.

Key Parameters

Parameter	Value	Substitution Relevance
Connector Type	Receptacle, Female Sockets	Critical - must match for mating compatibility
Number of Positions	37	Critical - pin count must be identical
Shell Size, Connector Layout	4 (DC, C)	Critical - determines physical form factor
Mounting Type	Through Hole	Critical - PCB assembly method
Termination	Solder	Critical - connection method to PCB
Contact Finish	Gold	Important - electrical performance and reliability
Shell Material, Finish	Steel, Tin Plated	Important - mechanical durability and corrosion resistance
Voltage Rating	250V (Main) / 125V (Substitutes)	Important - electrical safety margin
Current Rating (Amps)	3A (Main) / 6A (Substitutes)	Important - power handling capacity
Operating Temperature	-55°C ~ 125°C (Main) / -55°C ~ 105°C (Substitutes)	Important - thermal operating range
RoHS Status	RoHS Compliant	Important - regulatory compliance
Material Flammability Rating	UL94 V-0	Important - safety certification

Substitute Part Grouping Explanation

Substitution compatibility for the L77SDCG37SOL2RM8 is determined by strict adherence to the following critical parameters:

Critical Matching Parameters:

Connector Type: Receptacle, Female Sockets (all substitutes match)
Number of Positions: 37 (all substitutes match)
Number of Rows: 2 (all substitutes match)
Shell Size, Connector Layout: 4 (DC, C) (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
Termination: Solder (all substitutes match)
Contact Type: Signal (all substitutes match)
Contact Material: Phosphor Bronze (all substitutes match)
Contact Finish: Gold (all substitutes match)
Material Flammability Rating: UL94 V-0 (all substitutes match)
Moisture Sensitivity Level: 1 (Unlimited) (all substitutes match)

Variable Parameters Affecting Substitution:

Flange Feature: Board Side (M3) on main part; Mating Side Female Screwlock (4-40), Housing/Shell (4-40), or Housing/Shell (Unthreaded) on substitutes
Contact Finish Thickness: Flash (main part) vs. 30.0µin (0.76µm) (substitutes)
Voltage Rating: 250V (main part) vs. 125V (substitutes) - substitutes have lower voltage rating
Current Rating: 3A (main part) vs. 6A (substitutes) - substitutes have higher current capacity
Operating Temperature: -55°C ~ 125°C (main part) vs. -55°C ~ 105°C (substitutes) - substitutes have lower maximum temperature
Dielectric Material: Thermoplastic, Glass Filled (main part) vs. Polyester (substitutes)
Series: SD (main part) vs. AMPLIMITE HD-20 (substitutes)

All TE Connectivity AMP Connectors substitutes maintain the essential mechanical and electrical interface characteristics required for direct PCB replacement while offering enhanced current handling capacity. The lower voltage and temperature ratings of substitutes must be evaluated against specific application requirements.

Parameter Comparison

Parameter	L77SDCG37SOL2RM8 (Main)	1-5747301-4	1-5747301-6	2-5747709-0	5745059-4	5745079-4	5745079-6	5747301-2	5747301-7	5747301-8	5787685-1
Manufacturer	Amphenol ICC	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity
Manufacturer Part Number	L77SDCG37SOL2RM8	1-5747301-4	1-5747301-6	2-5747709-0	5745059-4	5745079-4	5745079-6	5747301-2	5747301-7	5747301-8	5787685-1
Series	SD	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20	AMPLIMITE HD-20
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	37	37	37	37	37	37	37	37	37	37	37
Number of Rows	2	2	2	2	2	2	2	2	2	2	2
Shell Size, Connector Layout	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness	Flash	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	Flash	30.0µin (0.76µm)	30.0µin (0.76µm)
Shell Material, Finish	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Not Specified	Not Specified	Not Specified	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated
Voltage Rating	250V	125V	125V	125V	125V	125V	125V	125V	125V	125V	125V
Current Rating (Amps)	3A	6A	6A	6A	6A	6A	6A	6A	6A	6A	6A
Operating Temperature	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	774 Pcs New Original	3446 Pcs New Original	1029 Pcs New Original	1537 Pcs New Original	2769 Pcs New Original	1481 Pcs New Original	3603 Pcs New Original	1660 Pcs New Original	3673 Pcs New Original	32900 Pcs New Original	1189 Pcs New Original

Engineering Selection Recommendations

Voltage Rating Consideration: The L77SDCG37SOL2RM8 operates at 250V, while all TE Connectivity AMPLIMITE HD-20 substitutes operate at 125V. Applications requiring the full 250V rating cannot use these substitutes. Applications operating at or below 125V may proceed with substitute selection based on other parameters.

Current Rating Consideration: All TE Connectivity substitutes provide 6A current capacity compared to the 3A rating of the main part. This represents a 100% increase in current handling capability. Applications requiring only 3A or less benefit from the enhanced margin provided by substitutes. Applications requiring exactly 3A or lower current capacity may use substitutes without derating concerns.

Operating Temperature Consideration: The main part operates to 125°C maximum, while substitutes operate to 105°C maximum. Applications requiring operation above 105°C must use the original L77SDCG37SOL2RM8. Applications operating at or below 105°C may use substitutes.

RoHS Compliance: All parts maintain RoHS compliance status. The main part is RoHS Compliant. Substitutes are either RoHS Compliant or ROHS3 Compliant. Both compliance levels are acceptable for regulatory purposes.

Flange Configuration: The main part features Board Side (M3) flange. Substitutes offer three flange options:

Mating Side, Female Screwlock (4-40): Parts 1-5747301-4, 1-5747301-6, 5745079-4, 5745079-6, 5787685-1
Housing/Shell (4-40): Parts 2-5747709-0, 5745059-4, 5747301-7, 5747301-8
Housing/Shell (Unthreaded): Part 5747301-2

Flange configuration selection depends on mechanical mounting requirements and mating connector specifications.

Recommended Substitutes for Standard Applications: Part 5747301-8 offers the highest inventory availability (32,900 pcs) with Housing/Shell (4-40) flange configuration, RoHS Compliant status, and standard 30.0µin gold contact finish thickness. This part is suitable for applications operating at 125V or below, 105°C or below, and requiring 6A or less current capacity.

Part 5745079-6 offers high inventory availability (3,603 pcs) with Mating Side, Female Screwlock (4-40) flange configuration, RoHS Compliant status, and standard 30.0µin gold contact finish thickness. This part is suitable for applications with mating-side screw-lock requirements.

Part 5787685-1 includes Board Lock feature matching the main part's mechanical design, with Mating Side, Female Screwlock (4-40) flange configuration and RoHS Compliant status.

Frequently Asked Questions (FAQ)

Q: Can I use a TE Connectivity AMPLIMITE HD-20 substitute in place of the L77SDCG37SOL2RM8?

A: Direct substitution is possible only if your application meets all of the following conditions: (1) Operating voltage is 125V or below, (2) Operating temperature is 105°C or below, (3) Required current is 6A or below, (4) The flange configuration of the substitute matches your mechanical mounting requirements. If any of these conditions are not met, the original L77SDCG37SOL2RM8 must be used.

Q: What is the difference between the flange configurations offered by the substitutes?

A: The main part features Board Side (M3) flange for board-mounted attachment. Substitute parts offer three alternatives: Mating Side, Female Screwlock (4-40) for connector-side attachment with threaded fastening, Housing/Shell (4-40) for shell-mounted attachment with threaded fastening, and Housing/Shell (Unthreaded) for shell-mounted attachment without threaded fastening. Selection depends on your specific mechanical assembly design.

Q: Why do the substitute parts have a higher current rating (6A vs. 3A)?

A: The TE Connectivity AMPLIMITE HD-20 series is designed with enhanced current-carrying capability compared to the Amphenol ICC SD series. The 6A rating reflects the contact and conductor design of the AMPLIMITE HD-20 series. Applications requiring only 3A benefit from the additional safety margin provided by the 6A-rated substitutes.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are either RoHS Compliant or ROHS3 Compliant. Both compliance levels meet current regulatory requirements. RoHS3 represents an updated compliance verification, while RoHS Compliant represents the original compliance status. Both are acceptable for regulatory purposes.

Q: What is the difference between Flash and 30.0µin (0.76µm) contact finish thickness?

A: Flash plating is a minimal gold coating applied to the contact surface, typically less than 0.25µm. The 30.0µin (0.76µm) thickness represents a standard gold plating specification providing enhanced durability and contact reliability. For most applications, the thicker 30.0µin plating offers superior long-term performance. The main part uses Flash plating, while most substitutes use 30.0µin plating. Part 5747301-7 offers Flash plating matching the main part.

Q: Which substitute part has the best inventory availability?

A: Part 5747301-8 has the highest inventory availability with 32,900 pieces in stock. This part features Housing/Shell (4-40) flange configuration, RoHS Compliant status, and standard 30.0µin gold contact finish thickness.

Q: Can I use a substitute part if my application requires 250V operation?

A: No. All TE Connectivity AMPLIMITE HD-20 substitutes are rated for 125V maximum. Applications requiring 250V operation must use the original L77SDCG37SOL2RM8 or equivalent parts rated for 250V. Substitutes cannot be used for 250V applications.

Q: What is the difference between the dielectric materials used?

A: The main part uses Thermoplastic, Glass Filled dielectric material. Substitute parts use Polyester dielectric material. Both materials meet UL94 V-0 flammability requirements. Polyester dielectric is standard in the AMPLIMITE HD-20 series and provides reliable electrical insulation for signal applications.

Q: Are the substitute parts mechanically compatible with the original connector housing?

A: Yes. All substitute parts maintain the same shell size 4 (DC, C) configuration, 37-position layout, 2-row arrangement, and through-hole solder termination as the original part. Mechanical compatibility with mating connectors and PCB mounting is maintained. However, flange configuration differences must be evaluated for your specific mechanical assembly design.

Q: What packaging format do the substitute parts use?

A: The main part is supplied in Tray packaging. All TE Connectivity AMPLIMITE HD-20 substitute parts are supplied in Tube packaging. If your assembly process requires Tray packaging, this difference must be accommodated in your procurement and handling procedures.

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