L77SDDH50SOL2GC309

Part Overview

The L77SDDH50SOL2GC309 is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female socket contacts with through-hole solder termination and is designated for signal applications in D-Sub connectivity solutions. The product maintains active status with 740 units in current inventory stock. Alternative connector models are evaluated to provide design flexibility for circuit board assembly and equipment integration where equivalent electrical and mechanical performance specifications are achievable.

Key Parameters

Parameter	Value
Manufacturer Part Number	L77SDDH50SOL2GC309
Manufacturer	Amphenol ICC (Commercial Products)
Category	D-Sub, D-Shaped Connectors
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	50
Number of Rows	3
Shell Size, Connector Layout	5 (DD, D)
Mounting Type	Through Hole
Termination	Solder
Current Rating (Amps)	3A
Voltage Rating	250V
Operating Temperature	-55°C ~ 125°C
Contact Finish	Gold
Contact Finish Thickness	30.0µin (0.76µm)
Shell Material, Finish	Steel, Tin Plated
Contact Material	Phosphor Bronze
Dielectric Material	Thermoplastic, Glass Filled
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the L77SDDH50SOL2GC309 are evaluated based on the following key parameters:

Connector Geometry: Shell size 5 (DD, D), 50-position count, 3-row configuration, and D-Sub form factor
Electrical Performance: Current rating, voltage rating, and contact materials
Termination Method: Solder termination compatibility
Operating Environment: Temperature range and moisture sensitivity
Regulatory Compliance: RoHS status and material flammability ratings
Contact Configuration: Female socket receptacle type

All substitute parts listed maintain identical connector geometry, termination method, and core electrical architecture. Variations in specific parameters (such as flange design, shell finish, contact finish thickness, and current rating) are documented to enable informed selection based on application requirements.

Parameter Comparison

Parameter	L77SDDH50SOL2GC309	5745080-4	5745080-6	D50S24A4GV00LF	D50S24A4GX00LF	D50S24A4PA00LF	DD50S364TLF	DDM50S300
Manufacturer	Amphenol ICC (Commercial Products)	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
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
Number of Positions	50	50	50	50	50	50	50	50
Shell Size	5 (DD, D)	5 (DD, D)	5 (DD, D)	5 (DD, D)	5 (DD, D)	5 (DD, D)	5 (DD, D)	5 (DD, D)
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Current Rating (Amps)	3A	6A	6A	5A per Contact	5A per Contact	5A per Contact	5A per Contact	7.5A per Contact
Voltage Rating	250V	125V	125V	300V	300V	300V	300V	300V
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Copper Alloy	Phosphor Bronze
Operating Temperature	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°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
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS non-compliant

Engineering Selection Recommendations

Selection of substitute parts must consider the following factors based on product compliance and regulatory status:

RoHS Compliant Options: Parts 5745080-4, 5745080-6, D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF, and DD50S364TLF maintain RoHS compliance alignment with the primary part L77SDDH50SOL2GC309. These options are suitable for applications requiring RoHS-compliant component sourcing.

Electrical Parameter Differences: The TE Connectivity parts (5745080-4 and 5745080-6) provide higher current ratings (6A) but operate at a reduced voltage rating (125V) compared to the primary part (250V). The Amphenol Delta D series (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF) and DM HE501 series (DDM50S300) provide higher voltage ratings (300V) and higher current ratings (5A to 7.5A per contact).

Temperature Range Considerations: Parts 5745080-4 and 5745080-6 operate to a maximum of 105°C, whereas the primary part and most substitute options operate to 125°C. Application temperature limits must be verified for these options.

Non-Compliant Option: DDM50S300 carries RoHS non-compliant status due to yellow cadmium plating on the shell. This part may be unsuitable for applications with RoHS compliance requirements but remains an option for legacy systems or applications without regulatory constraints.

Frequently Asked Questions (FAQ)

Q: Can 5745080-4 and 5745080-6 directly replace the L77SDDH50SOL2GC309?

A: These TE Connectivity AMPLIMITE HD-20 series connectors share identical physical dimensions (50 positions, shell size 5, through-hole solder termination) and contact configuration. However, the reduced voltage rating (125V versus 250V) and lower maximum operating temperature (105°C versus 125°C) must be evaluated against application requirements.

Q: What are the key differences between Amphenol Delta D series variants (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF)?

A: All three Delta D variants provide identical electrical performance (5A per contact, 300V rating, -55°C to 125°C operation) and RoHS compliance. Primary differences involve flange mounting design: D50S24A4GV00LF features mating-side female screwlock, D50S24A4GX00LF features housing/shell threaded mounting, and D50S24A4PA00LF features housing/shell unthreaded mounting. Board lock feature is present in GV00LF and GX00LF variants.

Q: Why is DDM50S300 designated RoHS non-compliant?

A: DDM50S300 uses yellow cadmium-plated steel shell finish, which is restricted under RoHS regulations. This designation does not affect electrical performance but requires evaluation of regulatory applicability to the end application.

Q: Are all substitute parts mechanically compatible with the original L77SDDH50SOL2GC309?

A: All listed substitute parts maintain shell size 5 (DD, D) geometry, 50-position count, 3-row configuration, and through-hole solder termination. Physical mating and mounting interfaces are compatible. Flange design variations (board-side versus mating-side mounting features) require verification against specific circuit board layout and mechanical assembly requirements.

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

A: The primary part specifies 30.0µin (0.76µm) gold finish thickness, while most Delta D and DM HE501 series parts specify flash gold finish without explicit thickness measurement. Both finishes provide corrosion resistance and electrical conductivity for signal applications. Flash finish may offer cost advantages in high-volume applications.

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