L77SDC37SOL2GC309 D-Sub 37-Position Receptacle Connector: Equivalent & Substitute Parts

Part Overview

The L77SDC37SOL2GC309 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 rating (MSL 1). The connector is designed for signal applications requiring a 250V rating and 3A current capacity across an operating temperature range of -55°C to 125°C.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit alternative configurations within the same connector family. TE Connectivity AMP Connectors offers multiple equivalent options within the AMPLIMITE HD-20 series that maintain core electrical and mechanical compatibility while providing different flange configurations and current ratings.

Key Parameters

Parameter	L77SDC37SOL2GC309
Connector Type	D-Sub Receptacle, Female Sockets
Number of Positions	37
Shell Size / Layout	4 (DC, C)
Mounting Type	Through Hole
Termination Method	Solder
Shell Material / Finish	Steel, Tin Plated
Contact Finish	Gold, 30.0µin (0.76µm)
Contact Material	Phosphor Bronze
Voltage Rating	250V
Current Rating	3A
Operating Temperature	-55°C to 125°C
Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the L77SDC37SOL2GC309 is determined by strict adherence to the following core parameters:

Mandatory Compatibility Parameters:

Connector type: D-Sub receptacle with female sockets
Position count: 37 positions
Shell size and layout: 4 (DC, C)
Mounting method: Through hole
Termination: Solder
Contact material: Phosphor bronze
Contact finish: Gold
Flammability rating: UL94 V-0
Moisture sensitivity: MSL 1

Allowable Variations:

Voltage rating: Substitute parts rated at 125V are acceptable for applications not requiring the full 250V specification
Current rating: Substitute parts rated at 6A exceed the 3A requirement and are acceptable
Operating temperature: Substitute parts with -55°C to 105°C range are acceptable for applications not requiring the full 125°C upper limit
Flange configuration: Housing/shell unthreaded, housing/shell threaded (4-40), or mating side female screwlock (4-40) are interchangeable based on application requirements
Dielectric material: Polyester substitutes for thermoplastic glass-filled material
Shell material finish: Variations in tin plating specification are acceptable

All TE Connectivity AMPLIMITE HD-20 series parts listed meet these substitution criteria and maintain functional equivalence for standard D-Sub 37-position receptacle applications.

Parameter Comparison

Parameter	L77SDC37SOL2GC309	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
Part Number	L77SDC37SOL2GC309	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	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets	D-Sub Receptacle, Female Sockets
Positions	37	37	37	37	37	37	37	37	37	37	37
Shell Size / 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
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
Contact Finish	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)	Gold, Flash	Gold, 30.0µin (0.76µm)	Gold, 30.0µin (0.76µm)
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Voltage Rating	250V	125V	125V	125V	125V	125V	125V	125V	125V	125V	125V
Current Rating	3A	6A	6A	6A	6A	6A	6A	6A	6A	6A	6A
Operating Temperature	-55°C to 125°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Flange Feature	Housing/Shell (Unthreaded)	Mating Side, Female Screwlock (4-40)	Mating Side, Female Screwlock (4-40)	Housing/Shell (4-40)	Housing/Shell (4-40)	Mating Side, Female Screwlock (4-40)	Mating Side, Female Screwlock (4-40)	Housing/Shell (Unthreaded)	Housing/Shell (4-40)	Housing/Shell (4-40)	Mating Side, Female Screwlock (4-40)
Dielectric Material	Thermoplastic, Glass Filled	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester
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
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	916 Pcs	3446 Pcs	1029 Pcs	1537 Pcs	2769 Pcs	1481 Pcs	3603 Pcs	1660 Pcs	3673 Pcs	32900 Pcs	1189 Pcs

Engineering Selection Recommendations

Primary Consideration: Voltage Rating Differential

The L77SDC37SOL2GC309 operates at 250V, while all TE Connectivity AMPLIMITE HD-20 substitute parts are rated at 125V. Selection of substitute parts is appropriate only for applications where the circuit voltage does not exceed 125V. For applications requiring the full 250V rating, the L77SDC37SOL2GC309 remains the only suitable option among the listed parts.

Current Rating Enhancement

All substitute parts provide 6A current capacity compared to the primary part's 3A rating. This represents a performance enhancement and does not restrict substitution for applications requiring 3A or less.

Operating Temperature Range

The L77SDC37SOL2GC309 supports -55°C to 125°C operation. All substitute parts support -55°C to 105°C. Substitution is appropriate for applications not requiring operation above 105°C. Applications requiring sustained operation between 105°C and 125°C must retain the primary part.

Flange Configuration Selection

Substitute parts offer three flange options:

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

Selection depends on mechanical mounting requirements. The unthreaded housing option (5747301-2) most closely matches the primary part's unthreaded configuration.

Compliance and Regulatory Status

All substitute parts maintain UL94 V-0 flammability rating and MSL 1 moisture sensitivity rating. RoHS compliance is confirmed across all options. REACH status varies; parts designated as REACH Affected (2-5747709-0, 5745059-4, 5745079-6, 5747301-7, 5747301-8, 5787685-1) require verification against specific application regulatory requirements.

Inventory and Availability

Part 5747301-8 provides the highest inventory level (32,900 pcs), followed by 5745079-6 (3,603 pcs) and 5747301-7 (3,673 pcs). These options offer superior supply chain stability for high-volume applications.

Recommended Substitution Priority

For applications not exceeding 125V and 105°C:

5747301-8 (Housing/Shell 4-40, highest inventory)
5747301-7 (Housing/Shell 4-40, ROHS3 compliant)
5747301-2 (Housing/Shell Unthreaded, closest mechanical match to primary part)

Frequently Asked Questions (FAQ)

Q: Can I use a 125V-rated substitute part in a 250V application?

A: No. The L77SDC37SOL2GC309 is specifically rated for 250V operation. Substitute parts rated at 125V must not be used in circuits exceeding 125V. Exceeding the voltage rating creates electrical safety and reliability risks.

Q: What is the difference between the flange configurations offered in substitute parts?

A: Three flange types are available. Housing/Shell (Unthreaded) provides a smooth mounting surface. Housing/Shell (4-40) includes threaded mounting holes for mechanical fastening. Mating Side Female Screwlock (4-40) integrates locking features on the connector mating interface. Selection depends on the mechanical mounting structure of your application.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitute parts are RoHS compliant. However, REACH status varies. Parts marked as REACH Affected require verification against your specific regulatory jurisdiction and application requirements.

Q: Can I substitute a part with a lower operating temperature range?

A: Substitution is acceptable only if your application does not require operation above 105°C. All substitute parts support the full -55°C lower limit. If your design requires sustained operation between 105°C and 125°C, the L77SDC37SOL2GC309 must be retained.

Q: What is the significance of the contact finish thickness difference?

A: The L77SDC37SOL2GC309 specifies 30.0µin (0.76µm) gold plating. Most substitute parts match this specification. Part 5747301-7 specifies Flash gold plating, which is a thinner deposit. Flash plating is acceptable for standard signal applications but may not provide equivalent corrosion resistance in high-humidity or corrosive environments over extended service life.

Q: Does the dielectric material difference affect compatibility?

A: The primary part uses thermoplastic glass-filled dielectric; substitute parts use polyester. Both materials meet UL94 V-0 flammability requirements and maintain electrical insulation properties. Polyester dielectric is standard in the AMPLIMITE HD-20 series and is functionally equivalent for D-Sub connector applications.

Q: Which substitute part has the best inventory availability?

A: Part 5747301-8 provides the highest inventory level at 32,900 pieces, offering superior supply chain stability for production applications requiring multiple units.

Q: Are the substitute parts mechanically interchangeable with the primary part?

A: Yes, all substitute parts maintain the same 37-position D-Sub shell size (4 DC, C) and through-hole solder termination. Mechanical interchangeability is confirmed. Flange configuration differences affect mounting methodology but not connector interface compatibility.

Q: Can I mix substitute parts from different manufacturers in the same assembly?

A: All substitute parts listed are manufactured by TE Connectivity. The primary part is manufactured by Amphenol ICC. While electrically and mechanically compatible, mixing manufacturers in the same assembly may introduce supply chain complexity. Standardization on a single substitute part is recommended for production consistency.

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