L77DFCH37STRM5 Equivalent & Substitute Parts

Part Overview

The L77DFCH37STRM5 is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC, featuring female sockets with panel mount, through-hole solder termination. This connector is classified as active product status with full RoHS compliance and unlimited moisture sensitivity rating. The connector operates across an extended temperature range of -55°C to 155°C with a current rating of 7.5A and voltage rating of 300V.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative sourcing improves supply chain resilience, or when design requirements permit functional equivalents that meet the same electrical and mechanical specifications. TE Connectivity AMP Connectors offers multiple equivalent 37-position D-Sub receptacle options within the AMPLIMITE HD-20 series that maintain core connector functionality while presenting variations in mounting configuration and contact finish specifications.

Key Parameters

Parameter	Value
Connector Type	Receptacle, Female Sockets
Number of Positions	37
Number of Rows	2
Shell Size, Connector Layout	4 (DC, C)
Termination Type	Solder
Contact Type	Signal
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Material Flammability Rating	UL94 V-0
Operating Temperature Range	-55°C ~ 155°C
Current Rating	7.5A
Voltage Rating	300V
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the L77DFCH37STRM5 is determined by the following critical parameters:

Core Compatibility Requirements:

Connector type must be receptacle with female sockets
Position count must be 37
Row configuration must be 2 rows
Shell size and layout must be 4 (DC, C)
Termination must be solder
Contact type must be signal
Material flammability rating must be UL94 V-0
Contact finish must be gold

Parameters Permitting Variation:

Mounting configuration (panel mount versus through-hole)
Flange feature design (board side versus mating side versus housing/shell)
Contact finish thickness (20.0µin, 30.0µin, or flash)
Dielectric material (thermoplastic glass-filled versus polyester)
Contact material (copper alloy versus phosphor bronze)
Current rating (7.5A versus 6A)
Voltage rating (300V versus 125V)
Operating temperature upper limit (-55°C to 155°C versus -55°C to 105°C)

The TE Connectivity AMPLIMITE HD-20 series substitute parts maintain the essential 37-position D-Sub receptacle architecture and solder termination while offering alternative mounting and contact specifications. All substitute parts listed are active product status with appropriate RoHS or ROHS3 compliance certifications.

Parameter Comparison

Parameter	L77DFCH37STRM5	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
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
Operating Temperature Range	-55°C ~ 155°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
Color	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black
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)
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet the core functional requirements of a 37-position D-Sub receptacle with solder termination and gold-plated contacts. Selection among substitute options depends on specific application constraints:

For applications requiring extended temperature operation (-55°C to 155°C): The L77DFCH37STRM5 is the only option in this comparison that supports the full extended temperature range. Substitute parts are limited to -55°C to 105°C operation.

For applications with voltage requirements exceeding 125V: The L77DFCH37STRM5 with 300V rating is required. All substitute parts are rated for 125V maximum.

For applications with current requirements exceeding 6A: The L77DFCH37STRM5 with 7.5A rating is required. All substitute parts are rated for 6A maximum.

For RoHS compliance: All substitute parts carry either RoHS Compliant or ROHS3 Compliant status. Part 745079-4 carries "Not applicable" RoHS status and should be avoided in applications requiring RoHS certification.

For mounting configuration: The L77DFCH37STRM5 features panel mount with through-hole termination. All substitute parts feature through-hole termination only, without panel mount capability. This represents a significant mechanical difference requiring board layout modification.

For contact finish thickness: The L77DFCH37STRM5 specifies 20.0µin (0.51µm) gold plating. Most substitute parts specify 30.0µin (0.76µm), with part 5747301-7 specifying flash plating. Thicker gold plating provides enhanced wear resistance and contact durability.

For high-volume availability: Part 5747301-8 maintains the highest inventory level at 32,900 pieces, followed by 5745079-6 at 3,603 pieces and 1-5747301-4 at 3,446 pieces.

Frequently Asked Questions (FAQ)

Q: Can TE Connectivity AMPLIMITE HD-20 series parts directly replace the Amphenol ICC L77DFCH37STRM5?

A: Direct replacement depends on application requirements. All substitute parts maintain the 37-position D-Sub receptacle configuration with solder termination and gold-plated contacts. However, substitute parts operate at reduced voltage (125V versus 300V), reduced current (6A versus 7.5A), and reduced temperature range (-55°C to 105°C versus -55°C to 155°C). Mounting configuration differs, with substitutes offering through-hole only versus the original's panel mount capability. Substitution is valid only when application specifications fall within the reduced electrical and thermal limits of the substitute part.

Q: What is the significance of contact finish thickness variation between 20.0µin, 30.0µin, and flash plating?

A: Contact finish thickness affects contact durability and wear resistance. The original L77DFCH37STRM5 specifies 20.0µin (0.51µm) gold plating. Most substitute parts specify 30.0µin (0.76µm), providing 50% greater plating thickness for enhanced durability in high-cycle mating applications. Part 5747301-7 specifies flash plating, which is a minimal coating thickness applied for corrosion protection only. Flash plating is suitable for applications with minimal mating cycles. Thicker plating is generally preferred for connectors experiencing frequent connection and disconnection cycles.

Q: What mounting configuration differences exist between the original part and substitutes?

A: The L77DFCH37STRM5 features panel mount with through-hole solder termination, allowing the connector to be mounted directly to a panel with solder connections to PCB traces. All substitute parts feature through-hole solder termination only, without panel mount capability. This requires the connector to be mounted directly to the PCB without panel integration. Applications requiring panel-mounted connectors cannot use the listed substitute parts without significant board redesign.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts carry RoHS Compliant or ROHS3 Compliant status. Part 745079-4 carries "Not applicable" RoHS status, indicating it does not meet RoHS certification requirements. Applications requiring RoHS compliance should exclude part 745079-4 and select from parts with explicit RoHS Compliant or ROHS3 Compliant designation.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant status?

A: RoHS Compliant indicates conformance to the original Restriction of Hazardous Substances directive. ROHS3 Compliant indicates conformance to RoHS 3 (Directive 2015/863/EU), which includes additional restricted substances beyond the original directive. Both certifications are acceptable for RoHS-regulated applications. ROHS3 Compliant parts meet more stringent environmental standards.

Q: Can substitute parts operate at the same voltage and current as the original L77DFCH37STRM5?

A: No. The original part is rated for 300V and 7.5A. All substitute parts are rated for 125V and 6A. Applications requiring operation at voltages exceeding 125V or currents exceeding 6A must use the original L77DFCH37STRM5 or identify alternative parts with higher electrical ratings.

Q: What is the temperature operating range limitation of substitute parts?

A: The original L77DFCH37STRM5 operates from -55°C to 155°C. All substitute parts operate from -55°C to 105°C, representing a 50°C reduction in maximum operating temperature. Applications requiring operation above 105°C must use the original part or identify alternatives with extended temperature ratings.

Q: Which substitute part offers the best availability?

A: Part 5747301-8 offers the highest inventory level at 32,900 pieces in stock. This part features housing/shell flange configuration with 4-40 mounting, steel tin-plated shell, and 30.0µin gold contact finish thickness. It carries RoHS Compliant status and REACH Affected designation.

Q: What is the difference between flange feature configurations (board side, mating side, housing/shell)?

A: Flange feature configuration determines how the connector attaches to the PCB or panel. Board side flange (original part) mounts to the PCB with the flange on the board side. Mating side flange mounts with the flange on the connector mating side, typically used for panel-mount applications. Housing/shell flange mounts with the flange integrated into the connector shell. These configurations affect mechanical mounting and are not interchangeable without board redesign.

Q: Are substitute parts suitable for high-reliability applications?

A: Substitute parts carry active product status and UL94 V-0 flammability rating, indicating suitability for general industrial applications. However, reduced electrical ratings (125V/6A versus 300V/7.5A) and reduced temperature range (-55°C to 105°C versus -55°C to 155°C) may limit suitability for high-reliability applications requiring extended operating margins. Applications with critical reliability requirements should evaluate whether reduced electrical and thermal specifications present acceptable risk.

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