L77DFD50S1AUN

Part Overview

The L77DFD50S1AUN is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This is a female socket connector with right-angle, through-hole, solder termination designed for panel mounting applications. The connector features tin-plated steel shell construction with gold-plated contacts rated for 7.5A at 300V. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and maintenance applications.

Substiute Parts

L77DFD50S1AUN

Amphenol ICC (Commercial Products)In Stock: 1143L77DFD50S1AUN Datasheet

Current PartRFQ

09670504763

HARTINGIn Stock: 87609670504763 Datasheet

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09670504764

HARTINGIn Stock: 81309670504764 Datasheet

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DD50S564MTLF

Amphenol ICC (FCI)In Stock: 1107DD50S564MTLF Datasheet

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DD50S564T

Amphenol ICC (FCI)In Stock: 869DD50S564T Datasheet

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DD50S564TLF

Amphenol ICC (FCI)In Stock: 35459DD50S564TLF Datasheet

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DD50S565MT

Amphenol ICC (FCI)In Stock: 974DD50S565MT Datasheet

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DD50S565MTLF

Amphenol ICC (FCI)In Stock: 1128DD50S565MTLF Datasheet

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DD50S864

Amphenol ICC (FCI)In Stock: 944DD50S864 Datasheet

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DDO50S565MTLF

Amphenol ICC (FCI)In Stock: 652DDO50S565MTLF Datasheet

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DDV50S565MTLF

Amphenol ICC (FCI)In Stock: 1162DDV50S565MTLF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the L77DFD50S1AUN is determined by the following critical electrical and mechanical parameters:

Position Count & Layout: All substitute parts maintain 50 positions in 3-row configuration with DD/D shell size compatibility.

Mounting Configuration: The main part specifies panel mount through-hole, right-angle orientation. Substitute parts include HARTING (09670504763, 09670504764) and Amphenol ICC (FCI) variants (DD50S564MTLF, DD50S565MTLF, DDO50S565MTLF, DDV50S565MTLF, DD50S864) all featuring through-hole, right-angle mounting.

Termination Type: All substitute parts utilize solder termination, consistent with the main part.

Shell Material & Finish: Primary substitutes maintain steel construction with tin plating. Contact finish is gold in Amphenol variants; HARTING parts do not specify contact finish.

Current & Voltage Ratings: The main part is rated 7.5A at 300V. Substitute parts vary:

• HARTING parts: ratings not specified
• Amphenol DD50S564TLF, DD50S565MTLF, DD50S565MT: 5A per contact at 300V
• Amphenol DDO50S565MTLF: 5A at unspecified voltage
• Amphenol DDV50S565MTLF: 7.5A at unspecified voltage

Operating Temperature: Main part operates -55°C to 155°C. All substitute parts operate -55°C to 125°C, representing a 30°C reduction in upper temperature limit.

Flange Features: Main part includes unthreaded housing. Substitutes include unthreaded housing (DD50S565MTLF, DDO50S565MTLF), 4-40 threaded flange (DDO50S565MTLF), or female screwlock (DDV50S565MTLF).

Parameter Comparison

Engineering Selection Recommendations

Active Product Alternatives: For new designs and ongoing applications, Amphenol ICC (FCI) series D parts provide active product status with RoHS compliance. DD50S565MTLF and DD50S564TLF offer the closest electrical alignment with 300V rating and tin-plated steel construction with gold contacts.

Current Rating Compatibility: The original part specifies 7.5A current capacity. DDV50S565MTLF maintains this 7.5A rating among all substitutes. Parts rated at 5A per contact (DD50S564TLF, DD50S565MTLF, DDO50S565MTLF) require verification for applications demanding the full 7.5A specification.

Temperature Operating Range: All substitute parts operate -55°C to 125°C, reducing the upper temperature limit by 30°C from the original -55°C to 155°C. Applications operating above 125°C require additional engineering review.

Compliance & Certifications: All active substitute parts maintain RoHS compliance. HARTING variants (09670504763, 09670504764) hold ROHS3 Compliant status with REACH Unaffected designation, suitable for EU-regulated applications. Amphenol variants show either REACH Unaffected or REACH Affected status depending on part variant.

Packaging & Inventory: Multiple packaging configurations are available: Bulk (HARTING, DDO50S565MTLF, DDV50S565MTLF), Tray (DD50S564TLF, DD50S565MTLF), and unspecified packaging (other Amphenol parts). Select packaging based on assembly requirements and volume.

Frequently Asked Questions (FAQ)

Q: Can I directly replace L77DFD50S1AUN with DD50S565MTLF?

A: DD50S565MTLF is electrically and mechanically compatible for most applications. Both share 50-position, 3-row DD/D shell configuration, right-angle through-hole solder termination, steel tin-plated construction, and gold contact finish. Critical differences: DD50S565MTLF is rated 5A per contact versus the original 7.5A, and operates -55°C to 125°C versus -55°C to 155°C. Verify application requirements against these specifications.

Q: What are the primary differences between Amphenol and HARTING substitutes?

A: Amphenol substitutes (DD50S564TLF, DD50S565MTLF, DDO50S565MTLF, DDV50S565MTLF) provide more complete specification data, including contact finish details and current ratings. HARTING parts (09670504763, 09670504764) lack specified contact finish, current, and voltage ratings but are active products with ROHS3 certification. Amphenol parts carry RoHS Compliant status. Both manufacturers meet the core 50-position, right-angle solder-termination requirement.

Q: Why does operating temperature differ across substitutes?

A: The original L77DFD50S1AUN operates to 155°C, while all substitutes are rated to 125°C maximum. This reflects differences in dielectric material specifications between the commercial product line and the current product series. Applications requiring operation above 125°C cannot use these substitute parts.

Q: Which substitute part best matches the 7.5A rating?

A: DDV50S565MTLF is the only substitute maintaining 7.5A current capacity. DD50S564TLF, DD50S565MTLF, and DDO50S565MTLF are all rated 5A. For applications requiring full 7.5A capacity, DDV50S565MTLF is the appropriate selection, provided the female screwlock flange feature is compatible with your mechanical design.

Q: Are REACH certifications different between parts?

A: Yes. Amphenol DD50S564TLF lists REACH Affected, while DD50S565MTLF and DDO50S565MTLF are REACH Unaffected. HARTING parts are REACH Unaffected. For applications subject to REACH regulations, verify the specific environmental restrictions associated with REACH Affected parts before selection.

Q: What does "GXT™" contact finish indicate?

A: GXT™ is a proprietary gold plating designation used by Amphenol. Parts specifying "Gold, GXT™" with 30.0µin thickness (DD50S565MTLF, DDO50S565MTLF) or unspecified thickness (DDV50S565MTLF) provide enhanced contact surface properties. The original part specifies standard gold at 20.0µin thickness. GXT™ is compatible with standard gold interfaces.

Q: Can I use DD50S564T or DD50S565MT without the "LF" suffix?

A: Parts without the "LF" designation have incomplete specification data in this reference. DD50S564T and DD50S565MT lack detailed electrical, thermal, and material specifications. Use only fully specified parts (with "LF" or complete datasheet documentation) to ensure design compatibility and regulatory compliance.