L77DFCF37SOL2 D-Sub 37-Position Receptacle Connector: Equivalent & Substitute Parts

Part Overview

The L77DFCF37SOL2 is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC, designed for panel mount, through-hole solder termination applications. This connector features female sockets in a 2-row configuration with shell size 4 (DC, C) layout. The part is currently active in production with 1062 units in stock inventory.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct functional replacement in circuit designs. Substitution becomes necessary when primary part availability is limited, supply chain constraints occur, or design flexibility permits alternative manufacturers meeting identical performance criteria.

Key Parameters

Parameter	L77DFCF37SOL2 Specification
Connector Type	Receptacle, Female Sockets
Number of Positions	37
Number of Rows	2
Shell Size, Connector Layout	4 (DC, C)
Mounting Type	Panel Mount, Through Hole
Termination Method	Solder
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Contact Material	Copper Alloy
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C to +155°C
Flange Feature	Housing/Shell (Unthreaded)
Dielectric Material	Thermoplastic, Glass Filled
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the L77DFCF37SOL2 are identified based on strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Connector Type: Receptacle, Female Sockets
Number of Positions: 37
Number of Rows: 2
Shell Size, Connector Layout: 4 (DC, C)
Termination Method: Solder
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Parameter Variations: Substitute parts may differ in the following parameters while maintaining functional equivalence:

Mounting Type: Through Hole (panel mount orientation may vary)
Shell Material Finish: Steel, Tin Plated (primary specification)
Contact Finish Thickness: Variations in gold plating thickness (20.0µin to 30.0µin or Flash)
Contact Material: Copper Alloy or Phosphor Bronze
Dielectric Material: Thermoplastic Glass Filled or Polyester
Current Rating: 6A to 7.5A (lower ratings acceptable for equivalent applications)
Voltage Rating: 125V to 300V (lower ratings acceptable for equivalent applications)
Operating Temperature Range: -55°C to +105°C or -55°C to +155°C
Flange Feature: Housing/Shell (Unthreaded), Housing/Shell (4-40), or Mating Side Female Screwlock (4-40)
Series: DF (Amphenol) or AMPLIMITE HD-20 (TE Connectivity)

All identified substitute parts are manufactured by TE Connectivity AMP Connectors and belong to the AMPLIMITE HD-20 series, maintaining D-Sub 37-position receptacle configuration with solder termination.

Parameter Comparison

Parameter	L77DFCF37SOL2	1-5747301-4	1-5747301-6	5745059-4	5745079-4	5745079-6	5747301-2	5747301-7	5747301-8	5787685-1	745079-4
Manufacturer	Amphenol ICC	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity
Series	DF	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	Panel Mount, 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	Not Specified	Not Specified	Not Specified	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Not Specified
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness	20.0µin (0.51µm)	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)	30.0µin (0.76µm)
Contact Material	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Current Rating (Amps)	7.5A	6A	6A	6A	6A	6A	6A	6A	6A	6A	6A
Voltage Rating	300V	125V	125V	125V	125V	125V	125V	125V	125V	125V	125V
Operating Temperature Range	-55°C to +155°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)	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)	Mating Side, Female Screwlock (4-40)
Dielectric Material	Thermoplastic, Glass Filled	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester
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	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	Not applicable
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory (Pcs)	1062	3446	1029	2769	1481	3603	1660	3673	32900	1189	1579

Engineering Selection Recommendations

Primary Substitution Candidates:

5747301-8 (TE Connectivity, 32900 units in stock) represents the highest-availability substitute with complete parameter alignment to the L77DFCF37SOL2 core specifications. This part maintains Housing/Shell (4-40) flange configuration, Steel Tin Plated shell finish, and RoHS Compliant status. The 6A current rating and 125V voltage rating are acceptable for applications not requiring the full 7.5A/300V capability of the original part. Operating temperature range of -55°C to +105°C covers standard industrial applications, with the exception of high-temperature environments exceeding +105°C.

5745079-6 (TE Connectivity, 3603 units in stock) provides strong availability with Mating Side Female Screwlock (4-40) flange configuration. RoHS Compliant status and identical electrical/mechanical core parameters support direct substitution in standard applications.

5747301-7 (TE Connectivity, 3673 units in stock) offers excellent inventory depth with Housing/Shell (4-40) flange mounting. ROHS3 Compliant certification and Flash gold contact finish provide alternative surface treatment while maintaining functional equivalence.

Secondary Substitution Candidates:

1-5747301-4, 1-5747301-6, 5745059-4, 5745079-4, 5747301-2, and 5787685-1 all meet mandatory parameter requirements with varying inventory levels (1029 to 3446 units). Selection among these parts depends on specific flange feature requirements (Mating Side Screwlock versus Housing/Shell configurations) and compliance certifications (RoHS versus ROHS3).

745079-4 (TE Connectivity, 1579 units in stock) is classified as "Not applicable" for RoHS status and should be selected only when RoHS compliance is not a design requirement.

Application Constraints:

All substitute parts operate within -55°C to +105°C temperature range, which is 50°C lower than the L77DFCF37SOL2 upper limit of +155°C. Applications requiring sustained operation above +105°C must retain the original Amphenol part.

All substitute parts are rated at 6A maximum current, compared to the original 7.5A rating. Applications requiring continuous current delivery above 6A must retain the original part.

All substitute parts are rated at 125V maximum voltage, compared to the original 300V rating. High-voltage applications exceeding 125V must retain the original part.

Frequently Asked Questions (FAQ)

Q1: Can I use a TE Connectivity AMPLIMITE HD-20 substitute in place of the Amphenol ICC L77DFCF37SOL2?

A: Yes, provided the application does not exceed the following limits: 6A continuous current (versus 7.5A original), 125V maximum voltage (versus 300V original), and +105°C maximum operating temperature (versus +155°C original). All substitute parts maintain identical 37-position, 2-row D-Sub receptacle configuration with solder termination and UL94 V-0 flammability rating.

Q2: What is the difference between Housing/Shell (Unthreaded), Housing/Shell (4-40), and Mating Side Female Screwlock (4-40) flange configurations?

A: These designations specify the mechanical mounting interface. Housing/Shell (Unthreaded) provides a smooth shell without threaded mounting holes. Housing/Shell (4-40) includes 4-40 threaded holes in the connector shell for panel mounting. Mating Side Female Screwlock (4-40) provides threaded female receptacles on the mating face for cable-side connector attachment. Selection depends on the mechanical assembly method required by the application.

Q3: Does the difference in contact material (Copper Alloy versus Phosphor Bronze) affect electrical performance?

A: Both Copper Alloy and Phosphor Bronze contacts provide equivalent electrical conductivity and signal integrity for D-Sub 37-position receptacle applications. The material difference does not affect functional performance in standard signal transmission applications. Both materials maintain gold plating surface finish for corrosion resistance and contact reliability.

Q4: What does "Contact Finish Thickness: Flash" mean on part 5747301-7?

A: Flash gold plating indicates a very thin gold coating applied to the contact surface, typically 0.1µm to 0.5µm thickness. This is thinner than the standard 20.0µin (0.51µm) or 30.0µin (0.76µm) specifications but provides adequate corrosion protection for standard applications. Flash plating reduces material cost while maintaining contact reliability for non-harsh environments.

Q5: Why do some substitute parts show "Not Specified" for Shell Material Finish?

A: Parts 5745059-4, 5745079-4, and 745079-4 do not include explicit shell material finish specifications in the provided data. These parts are functionally equivalent for applications where shell material finish is not a critical design parameter. If shell material specification is required for your application, contact the manufacturer for clarification or select parts with explicitly specified Steel Tin Plated finish.

Q6: What is the significance of ROHS3 Compliant versus RoHS Compliant status?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the most current regulatory version. Parts marked as RoHS Compliant or ROHS3 Compliant are both acceptable for applications requiring hazardous substance restriction compliance. The specific version designation reflects the regulatory framework under which the part was certified.

Q7: Can I use substitute parts with lower current and voltage ratings in high-power applications?

A: No. All substitute parts are rated at 6A maximum continuous current and 125V maximum voltage. Applications requiring 7.5A current delivery or 300V voltage operation must use the original L77DFCF37SOL2 part. Using lower-rated substitutes in high-power applications creates risk of connector overheating, contact degradation, and circuit failure.

Q8: Which substitute part offers the best inventory availability?

A: Part 5747301-8 (TE Connectivity AMPLIMITE HD-20) provides the highest inventory level at 32900 units in stock, compared to 1062 units for the original L77DFCF37SOL2. This part maintains RoHS Compliant status, Steel Tin Plated shell finish, and Housing/Shell (4-40) flange configuration, making it the optimal choice for applications where supply chain continuity is a priority.

Q9: Are all substitute parts suitable for solder termination assembly?

A: Yes. All identified substitute parts specify Solder termination method, matching the original L77DFCF37SOL2 specification. All parts are compatible with standard PCB solder assembly processes and wave soldering equipment.

Q10: What packaging format do substitute parts use?

A: The original L77DFCF37SOL2 is supplied in Bag packaging. All substitute parts are supplied in Tube packaging. Tube packaging provides enhanced protection during storage and transport compared to bag packaging. This packaging difference does not affect connector functionality or performance.

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