L77SDDG50SOL2GC309

Part Overview

The L77SDDG50SOL2GC309 is a 50-position D-Sub receptacle connector with female sockets, manufactured by Amphenol ICC (Commercial Products). This connector features through-hole solder termination, board-side M3 flange, and is rated for 3A at 250V. The part is currently active in production and RoHS compliant. Substitute parts are identified where electrical parameters, mechanical compatibility, and flange mounting configurations align with primary application requirements.

Substiute Parts

L77SDDG50SOL2GC309

Amphenol ICC (Commercial Products)In Stock: 1137L77SDDG50SOL2GC309 Datasheet

Current PartRFQ

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 L77SDDG50SOL2GC309 is determined by the following critical parameters:

• Electrical Compatibility: Current rating, voltage rating, and contact material must maintain or exceed specification requirements.
• Mechanical Compatibility: 50-position configuration, 3-row layout, shell size 5 (DD, D), through-hole mounting, and solder termination are mandatory.
• Flange Configuration: The board-side M3 flange mounting style determines mechanical fit. Alternatives include mating-side screwlock or unthreaded housing/shell configurations where system design permits different mounting approaches.
• Connector Type: All alternatives are receptacles with female sockets to ensure compatible mating with plug connectors.
• Thermal and Environmental: Operating temperature range of -55°C to 125°C is maintained across all substitute options.

The six substitute parts identified (5745080-4, 5745080-6, D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF, DD50S364TLF, DDM50S300) meet these core criteria with variations in current rating, voltage rating, flange style, contact finish thickness, and shell material/finish that may suit alternative deployment scenarios.

Parameter Comparison

Engineering Selection Recommendations

Electrical Considerations

Parts 5745080-4 and 5745080-6 (TE Connectivity AMP, AMPLIMITE HD-20 series) provide higher current ratings (6A) but operate at a reduced voltage maximum of 125V, which falls below the primary part specification of 250V. These options are suitable only for applications where voltage requirements do not exceed 125V.

The Delta D series parts (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF) and DD50S364TLF offer enhanced voltage ratings (300V) with current ratings of 5A per contact, exceeding the primary part's 3A specification. DDM50S300 provides the highest current rating at 7.5A per contact, also at 300V.

Temperature Range

Parts 5745080-4 and 5745080-6 operate to 105°C maximum, restricting use in applications requiring the full 125°C upper limit. All other substitute options maintain -55°C to 125°C compatibility.

Regulatory Compliance

DDM50S300 is RoHS non-compliant due to yellow cadmium plating. All remaining substitutes are RoHS compliant. Parts 5745080-4 and 5745080-6 carry ROHS3 certification; Delta D series and DD50S364TLF are RoHS compliant with varying REACH status.

Mechanical Compatibility

Flange configuration differences require board-level design evaluation. The primary part uses board-side M3 mounting. Alternatives employ mating-side screwlock (TE Connectivity parts, D50S24A4GV00LF), housing-based 4-40 threading (D50S24A4GX00LF), or unthreaded housing (D50S24A4PA00LF, DD50S364TLF, DDM50S300). System mechanical design must accommodate these variations.

Frequently Asked Questions (FAQ)

Q: Can I substitute a part with higher current rating without modification?

A: Yes. All substitute parts with current ratings of 5A or higher exceed the primary part's 3A specification and are electrically backward compatible from a current capacity perspective. However, circuit design must operate within its original specifications; higher ratings provide design margin but do not alter baseline electrical requirements.

Q: Are the TE Connectivity AMPLIMITE HD-20 parts direct replacements?

A: Not for all applications. Parts 5745080-4 and 5745080-6 are mechanically and structurally compatible but operate to a maximum voltage of 125V, compared to the primary part's 250V rating. Use only in systems where operating voltage does not exceed 125V. Additionally, the upper temperature limit is 105°C rather than 125°C.

Q: What is the difference between Delta D variants (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF)?

A: All three Delta D parts share identical electrical specifications (5A per contact, 300V, -55°C to 125°C, RoHS compliant). The primary difference is flange configuration: D50S24A4GV00LF uses mating-side female screwlock (4-40), D50S24A4GX00LF uses housing/shell 4-40 threaded mounting, and D50S24A4PA00LF uses unthreaded housing/shell. Select based on your system's mechanical mounting interface.

Q: Is DDM50S300 suitable for new designs?

A: DDM50S300 meets all electrical and mechanical requirements and offers the highest current rating (7.5A per contact). However, it is RoHS non-compliant due to yellow cadmium shell plating. Use only in applications where RoHS compliance is not mandated or where exemptions apply.

Q: Can I use parts with different contact finish thicknesses interchangeably?

A: Yes. The primary part specifies 30.0µin (0.76µm) contact finish thickness. Delta D and DD50S364TLF variants use flash-plated gold finishes, which provide equivalent electrical performance and mating durability for 50-position connector applications. Contact finish thickness variations do not affect electrical substitutability.

Q: What packaging differences exist, and do they affect compatibility?

A: The primary part ships in standard packaging (not specified). Substitute parts are available in tube (5745080-4, 5745080-6) or tray (Delta D series, DD50S364TLF, DDM50S300) configurations. Packaging affects logistics and handling but does not impact electrical or mechanical performance.