L77SDDG50SOL2 Equivalent & Substitute Parts

Part Overview

The L77SDDG50SOL2 is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder-terminated connector features female sockets in a 3-row configuration with shell size 5 (DD, D) layout. The connector is designed for signal applications requiring 3A current capacity at 250V operating voltage across an extended temperature range of -55°C to 125°C.

The L77SDDG50SOL2 maintains active product status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are necessary when addressing specific application requirements including higher current ratings, alternative flange configurations, different shell material finishes, or when managing component availability across supply chains.

Substiute Parts

L77SDDG50SOL2

Amphenol ICC (Commercial Products)In Stock: 1041L77SDDG50SOL2 Datasheet

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5745080-4

TE Connectivity AMP ConnectorsIn Stock: 15255745080-4 Datasheet

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5745080-6

TE Connectivity AMP ConnectorsIn Stock: 12025745080-6 Datasheet

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D50S24A4GV00LF

Amphenol ICC (FCI)In Stock: 1241D50S24A4GV00LF Datasheet

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D50S24A4GX00LF

Amphenol ICC (FCI)In Stock: 1255D50S24A4GX00LF Datasheet

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D50S24A4PA00LF

Amphenol ICC (FCI)In Stock: 952D50S24A4PA00LF Datasheet

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DD50S364TLF

Amphenol ICC (FCI)In Stock: 1057DD50S364TLF Datasheet

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DDM50S300

Amphenol ICC (FCI)In Stock: 1069DDM50S300 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77SDDG50SOL2 is determined by strict alignment of core electrical and mechanical parameters. All substitute parts must maintain the following critical specifications:

Mandatory Matching Parameters:

• 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
• Contact Finish: Gold
• Material Flammability Rating: UL94 V-0
• Contact Material: Phosphor Bronze
• Operating Temperature Range: -55°C ~ 125°C
• Moisture Sensitivity Level: 1 (Unlimited)

Parameters Permitting Variation:

• Current Rating: Substitute parts may exceed the 3A specification
• Voltage Rating: Substitute parts may exceed the 250V specification
• Flange Feature: Alternative configurations including mating side screwlock or housing/shell mounting
• Shell Material Finish: Alternative finishes including tin-nickel or yellow cadmium plating
• Contact Finish Thickness: Flash or specified micron ratings
• Dielectric Material: Thermoplastic, glass-filled or polyester alternatives
• RoHS Compliance Status: ROHS3 or RoHS non-compliant variants

The five substitute parts identified (D50S24A4GX00LF, DDM50S300, D50S24A4PA00LF, D50S24A4GV00LF, DD50S364TLF) satisfy all mandatory parameters while offering enhanced electrical performance or alternative mechanical configurations.

Parameter Comparison

Engineering Selection Recommendations

Amphenol ICC (FCI) Delta D Series Substitutes (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF):

These three parts from the Delta D series provide enhanced electrical performance with 5A per contact current rating and 300V voltage rating compared to the L77SDDG50SOL2 specifications. All three maintain full RoHS compliance and the complete -55°C to 125°C operating temperature range. The primary differentiation among these three substitutes lies in flange configuration: D50S24A4GV00LF features mating side female screwlock (4-40), D50S24A4GX00LF provides housing/shell (4-40) mounting, and D50S24A4PA00LF offers housing/shell unthreaded configuration. Selection between these three depends on specific mechanical mounting requirements. All three use polybutylene terephthalate (PBT) dielectric material and tin-nickel plated steel shells.

TE Connectivity AMPLIMITE HD-20 Series Substitutes (5745080-4, 5745080-6):

Both TE Connectivity parts deliver 6A current capacity with mating side female screwlock (4-40) flange configuration. These connectors maintain ROHS3 compliance and unlimited moisture sensitivity rating. Operating temperature range is -55°C to 105°C, which is 20°C lower than the L77SDDG50SOL2 maximum specification. Voltage rating is 125V, which is lower than the original part. These substitutes are suitable for applications where the reduced voltage and temperature specifications are acceptable and where the higher current capacity provides design margin.

Amphenol ICC (FCI) D Series Substitute (DD50S364TLF):

The DD50S364TLF offers 5A per contact current capacity and 300V voltage rating with housing/shell unthreaded flange configuration. This part maintains RoHS compliance and the full -55°C to 125°C operating temperature range. Contact material is copper alloy rather than phosphor bronze. Material flammability rating is not specified for this variant. This substitute is applicable when unthreaded housing/shell mounting is required.

Amphenol ICC (FCI) DM HE501 Series Substitute (DDM50S300):

The DDM50S300 provides the highest current capacity at 7.5A per contact with 300V voltage rating and housing/shell unthreaded flange configuration. This part maintains the full -55°C to 125°C operating temperature range and UL94 V-0 flammability rating. However, DDM50S300 is RoHS non-compliant due to yellow cadmium plating on the steel shell. This substitute is restricted to applications where RoHS compliance is not required and where the enhanced current capacity is necessary.

Frequently Asked Questions (FAQ)

Q: Can the L77SDDG50SOL2 be directly replaced with any of the substitute parts?

A: Direct replacement is possible only when the application requirements align with the substitute part specifications. All substitute parts maintain the same 50-position, 3-row, shell size 5 (DD, D) configuration with through-hole solder termination. However, flange configuration differences (board side M3 versus mating side screwlock or housing/shell variants) require mechanical design verification. Voltage and current rating differences must be evaluated against actual circuit requirements.

Q: What is the primary difference between the Amphenol ICC Delta D series substitutes?

A: The three Delta D series parts (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF) are electrically identical with 5A per contact current rating and 300V voltage rating. The distinguishing factor is flange configuration: D50S24A4GV00LF has mating side female screwlock (4-40), D50S24A4GX00LF has housing/shell (4-40), and D50S24A4PA00LF has housing/shell unthreaded. Selection depends on the mechanical mounting interface available in the application.

Q: Why do the TE Connectivity AMPLIMITE HD-20 substitutes have lower voltage and temperature ratings?

A: The 5745080-4 and 5745080-6 parts are designed for different application profiles. While they provide higher current capacity (6A versus 3A), the voltage rating is 125V and maximum operating temperature is 105°C. These specifications are inherent to the AMPLIMITE HD-20 series design. Applications requiring 250V or higher voltage operation or temperatures above 105°C must use alternative substitutes.

Q: Is the DDM50S300 suitable for RoHS-regulated applications?

A: No. The DDM50S300 is RoHS non-compliant due to yellow cadmium plating on the steel shell. This part is restricted to applications where RoHS compliance is not mandated. For RoHS-compliant applications, use D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF, or DD50S364TLF.

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

A: The L77SDDG50SOL2 specifies flash gold plating on contacts. The TE Connectivity substitutes specify 30.0µin (0.76µm) gold plating, which is a defined thickness. Flash plating is thinner and less precisely specified. Both approaches provide gold contact finish for signal integrity and corrosion resistance. The specific thickness requirement depends on application contact wear expectations and signal frequency.

Q: Can the L77SDDG50SOL2 be used in applications requiring 300V operation?

A: No. The L77SDDG50SOL2 is rated for 250V maximum. Applications requiring 300V operation must use substitute parts with 300V rating: D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF, DD50S364TLF, or DDM50S300.

Q: What packaging format differences exist among these parts?

A: The L77SDDG50SOL2 and all Amphenol ICC (FCI) substitutes are supplied in tray packaging. The TE Connectivity AMPLIMITE HD-20 substitutes (5745080-4 and 5745080-6) are supplied in tube packaging. Packaging format affects handling, storage, and automated assembly compatibility but does not affect electrical or mechanical performance.

Q: Are all substitute parts available in equivalent quantities?

A: Inventory levels vary. The L77SDDG50SOL2 has 1024 pieces in stock. Substitute inventory ranges from 854 pieces (D50S24A4PA00LF) to 1425 pieces (5745080-4). Availability should be verified for production requirements.