L77DFCH37SOL2RM5 D-Sub 37-Position Receptacle Connector Equivalent & Substitute Parts

Part Overview

The L77DFCH37SOL2RM5 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 1090 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when supply chain optimization is required, or when design flexibility permits the use of alternative manufacturers' components that meet the same electrical and mechanical specifications. TE Connectivity AMP Connectors offers multiple substitute options within the AMPLIMITE HD-20 series that maintain compatibility with the core functional requirements.

Key Parameters

Parameter	Value
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	Solder
Contact Type	Signal
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Material Flammability Rating	UL94 V-0
Operating Temperature Range	-55°C ~ 125°C
Voltage Rating	300V
Current Rating	7.5A
Color	Black
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the L77DFCH37SOL2RM5 with TE Connectivity AMP Connectors AMPLIMITE HD-20 series parts is based on the following core compatibility 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: Solder
Contact Type: Signal
Contact Finish: Gold
Material Flammability Rating: UL94 V-0
Color: Black
Moisture Sensitivity Level: 1 (Unlimited)

Parameters with Acceptable Variations:

Mounting Type: All substitutes use Through Hole mounting (primary part specifies Panel Mount, Through Hole; substitutes specify Through Hole only)
Shell Material, Finish: Substitutes may have unspecified shell material or tin-plated steel
Contact Finish Thickness: Varies from Flash to 30.0µin (0.76µm), compared to primary part's 20.0µin (0.51µm)
Voltage Rating: Substitutes rated at 125V (primary part rated at 300V)
Current Rating: Substitutes rated at 6A (primary part rated at 7.5A)
Operating Temperature Range: Substitutes rated -55°C ~ 105°C (primary part rated -55°C ~ 125°C)
Dielectric Material: Substitutes use Polyester (primary part uses Thermoplastic, Glass Filled)
Contact Material: Substitutes use Phosphor Bronze (primary part uses Copper Alloy)
Flange Feature: Varies among substitutes (Mating Side Female Screwlock, Housing/Shell with or without threading)

All substitute parts are active products with current inventory availability.

Parameter Comparison

Parameter	L77DFCH37SOL2RM5 (Amphenol ICC)	1-5747301-4 (TE)	1-5747301-6 (TE)	5745059-4 (TE)	5745079-4 (TE)	5745079-6 (TE)	5747301-2 (TE)	5747301-7 (TE)	5747301-8 (TE)	5787685-1 (TE)	745079-4 (TE)
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
Contact Type	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal
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)
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
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
Color	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black
Operating Temperature Range	-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
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)	1090	3446	1029	2769	1481	3603	1660	3673	32900	1189	1579

Engineering Selection Recommendations

Primary Substitute Recommendation: 5747301-8

Part number 5747301-8 from TE Connectivity AMP Connectors is the recommended primary substitute. This part maintains all mandatory compatibility parameters with the L77DFCH37SOL2RM5, including 37-position receptacle configuration, 2-row layout, shell size 4 (DC, C), solder termination, gold-plated contacts, UL94 V-0 flammability rating, and MSL 1 classification. The part is RoHS Compliant and currently has the highest inventory availability at 32,900 units, ensuring supply continuity. The part is active in production status.

Secondary Substitute Options:

5745079-6 (3603 units in stock) and 5747301-7 (3673 units in stock) are alternative substitutes with strong inventory positions. Both maintain core compatibility parameters. 5745079-6 is RoHS Compliant, while 5747301-7 is ROHS3 Compliant.

Compliance Considerations:

All substitute parts are active products with UL94 V-0 flammability certification and MSL 1 moisture sensitivity rating, matching the primary part's compliance profile. RoHS compliance status varies among substitutes; applications requiring specific RoHS versions should reference the individual part specifications. All parts carry EAR99 ECCN classification and 8536.69.4040 HTSUS code, consistent with the primary part.

Electrical Performance Derating:

Substitute parts are rated at 6A current and 125V voltage, compared to the primary part's 7.5A and 300V ratings. Applications operating at or near the primary part's maximum electrical specifications require design review to confirm compatibility with the lower substitute ratings.

Temperature Range Consideration:

Substitute parts are rated for -55°C to 105°C operation, compared to the primary part's -55°C to 125°C range. Applications requiring operation above 105°C are not suitable for these substitutes.

Frequently Asked Questions (FAQ)

Q: Can 5747301-8 be used as a direct replacement for L77DFCH37SOL2RM5 in all applications?

A: 5747301-8 maintains compatibility for the core connector function (37-position D-Sub receptacle, solder termination, signal contacts). However, applications operating above 105°C or requiring current levels above 6A must be evaluated against the substitute's lower electrical ratings. The primary part's 300V rating exceeds the substitute's 125V rating; applications requiring higher voltage isolation should be reviewed.

Q: What is the difference between the flange features on these substitute parts?

A: Substitute parts offer three flange configurations: Mating Side Female Screwlock (1-5747301-4, 1-5747301-6, 5745079-4, 5745079-6, 5787685-1, 745079-4), Housing/Shell with 4-40 threading (5745059-4, 5747301-7, 5747301-8), and Housing/Shell unthreaded (5747301-2). The primary part L77DFCH37SOL2RM5 specifies Board Side (4-40) flange. Flange selection depends on the specific mounting configuration in the application; mechanical fit must be verified against the PCB or panel layout.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts are RoHS Compliant or ROHS3 Compliant. Part 745079-4 has "Not applicable" RoHS status. Applications requiring specific RoHS certification should select from parts explicitly marked RoHS Compliant or ROHS3 Compliant.

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

A: The primary part specifies 20.0µin (0.51µm) gold contact finish thickness. Most substitutes provide 30.0µin (0.76µm), offering greater contact durability. Part 5747301-7 specifies Flash thickness. Thicker gold plating generally provides improved wear resistance and contact reliability over extended mating cycles.

Q: Can I use these substitutes interchangeably in the same design?

A: All listed substitutes maintain the same 37-position, 2-row, shell size 4 (DC, C) configuration and solder termination, allowing mechanical and electrical interchangeability within the connector interface. However, differences in flange features, contact material (Phosphor Bronze vs. Copper Alloy), and dielectric material (Polyester vs. Thermoplastic Glass Filled) may affect mechanical mounting and environmental performance. Design validation is required when switching between substitute parts.

Q: What is the REACH status difference between these parts?

A: REACH status varies among substitutes: "REACH Unaffected" (1-5747301-4, 1-5747301-6, 5747301-2), "REACH Affected" (5745059-4, 5745079-4, 5745079-6, 5747301-7, 5747301-8, 5787685-1, 745079-4), and "Vendor Undefined" (745079-4). Applications subject to REACH compliance requirements should select parts with "REACH Unaffected" or "REACH Compliant" status.

Q: Why does 5787685-1 include a Board Lock feature while others do not?

A: Part 5787685-1 includes a Board Lock feature, matching the primary part L77DFCH37SOL2RM5. This feature provides mechanical retention of the connector to the PCB during assembly and operation. If board lock functionality is required, 5787685-1 is the appropriate substitute; other parts without this feature may require alternative mechanical retention methods.

Q: What packaging format do these substitutes use?

A: The primary part L77DFCH37SOL2RM5 is supplied in Tray packaging. All substitute parts are supplied in Tube packaging. Tube packaging may require different handling and storage procedures; verify compatibility with receiving and inventory management processes.

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