L77SDDH50SOL2C309 Equivalent & Substitute Parts

Part Overview

The L77SDDH50SOL2C309 is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder-terminated connector features female sockets with a 3-row DD/D shell layout (Shell Size 5). The connector is actively produced and widely used in industrial and commercial applications requiring multi-contact signal distribution. Substitute parts are necessary to accommodate supply chain variations, specific flange configurations, thermal requirements, and compliance certifications while maintaining electrical and mechanical compatibility.

Substiute Parts

L77SDDH50SOL2C309

Amphenol ICC (Commercial Products)In Stock: 1031L77SDDH50SOL2C309 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

Substitute parts for the L77SDDH50SOL2C309 are selected based on strict electrical and mechanical compatibility criteria. All substitute parts maintain the core specifications that define functional interchangeability: 50-position receptacle configuration, 3-row layout, DD/D shell size (Shell Size 5), through-hole solder termination, and female socket contact type.

The critical parameters determining substitutability are:

• Connector Geometry: 50 positions, 3 rows, Shell Size 5 (DD, D)
• Termination Interface: Solder-terminated through-hole mounting
• Contact Configuration: Female sockets, Phosphor Bronze or Copper Alloy contacts with gold finish
• Electrical Performance: Voltage rating sufficient for 250V application (all substitutes rated ≥250V)
• Thermal Compatibility: Operating temperature range encompassing -55°C to 125°C
• Regulatory Compliance: UL94 V-0 flammability rating and RoHS compliance status

Substitute parts differ in specific flange mounting configurations (board-side versus mating-side versus unthreaded housing), shell finish materials, and current-carrying capacity. These variations allow selection based on application-specific board layout requirements and environmental conditions while preserving core electrical connectivity.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Preferred for Most Applications)

The D-series substitutes (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF) from Amphenol ICC (FCI) provide direct functional substitution. These connectors maintain RoHS compliance, support the full operating temperature range (-55°C to 125°C), and exceed the voltage rating of the main part (300V vs. 250V). The Delta D series features improved shell finish (Tin-Nickel plating) and higher current capacity (5A per contact). Selection among these three variants depends on flange mounting requirements: mating-side screwlock, housing-mounted threaded, or housing-mounted unthreaded configurations.

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

These connectors are functionally compatible for applications with reduced voltage and temperature requirements. Both parts are ROHS3 compliant and rated for 6A current. However, the voltage rating is limited to 125V and the maximum operating temperature is 105°C, restricting use to applications below these thresholds. The mating-side female screwlock flange configuration requires different mounting geometry than the board-side attachment of the main part.

DD50S364TLF (Legacy Alternative)

This part supports the full voltage and temperature specifications but lacks published flammability certification and uses Copper Alloy contacts instead of Phosphor Bronze. Suitable for applications where material certification is not required.

DDM50S300 (High Current Applications)

The DDM50S300 is rated for 7.5A per contact, providing highest current capacity among all listed parts. This part is not RoHS compliant due to yellow cadmium plating and therefore restricted for new design applications in regulated markets. Appropriate only for legacy system support or non-regulated applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute D-Sub 50-position connector from a different manufacturer? A: Yes, provided the substitute maintains the same mechanical interface (50 positions, 3 rows, Shell Size 5 DD/D), uses solder termination, and meets or exceeds the electrical ratings (voltage, current, temperature) of the original specification. The listed substitutes all satisfy these criteria.

Q: What is the difference between board-side and mating-side flange configurations? A: The flange determines mounting attachment method. Board-side flanges (L77SDDH50SOL2C309) attach to the PCB edge with mounting screws. Mating-side flanges (5745080-4, 5745080-6, D50S24A4GV00LF) attach to the mating connector housing. Housing-mounted unthreaded designs (D50S24A4PA00LF, DD50S364TLF, DDM50S300) mount to the connector enclosure without threaded inserts.

Q: Does the L77SDDH50SOL2C309 have higher current capacity than Delta D alternatives? A: No. The main part is rated 3A, while D50S24A4 variants provide 5A per contact. The TE Connectivity AMPLIMITE HD-20 series provides 6A. DDM50S300 provides the highest rating at 7.5A per contact.

Q: Are all listed substitutes RoHS compliant? A: No. DDM50S300 is non-compliant due to yellow cadmium plating. DD50S364TLF does not specify flammability certification. All other parts (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF, 5745080-4, 5745080-6) and the main part meet RoHS compliance requirements.

Q: Can I substitute L77SDDH50SOL2C309 in a 250V application using a TE Connectivity AMPLIMITE HD-20 connector? A: No. The AMPLIMITE HD-20 series (5745080-4, 5745080-6) is rated for maximum 125V, making it unsuitable for 250V applications. Use D-series (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF), DD50S364TLF, or DDM50S300 instead, all rated 300V.

Q: What is the functional difference between D50S24A4GV00LF, D50S24A4GX00LF, and D50S24A4PA00LF? A: All three are Delta D series connectors with identical electrical specifications (50 positions, 5A per contact, 300V, -55°C to 125°C). The differences are flange mounting style: GV00LF has mating-side female screwlock, GX00LF has housing-mounted threaded (4-40), and PA00LF has housing-mounted unthreaded attachment.

Q: Why does DDM50S300 show "Non-compliant" RoHS status? A: DDM50S300 uses yellow cadmium plating on the steel shell, which contains cadmium—a restricted substance under RoHS regulations. This part is restricted for new product designs in regulated markets but may be used for legacy system maintenance and non-regulated applications.

Q: Do all substitutes use the same contact material as the main part? A: Most substitutes use Phosphor Bronze contacts matching the L77SDDH50SOL2C309. The exception is DD50S364TLF, which uses Copper Alloy contacts. Both materials provide equivalent electrical performance for D-Sub applications.