L77DD50SV 50 Position D-Sub Receptacle Connector

Part Overview

The L77DD50SV is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder-terminated female socket connector operates across the industrial temperature range of -55°C to 125°C and supports a current rating of 7.5A. The connector is actively produced and maintains full RoHS compliance with unlimited moisture sensitivity level rating. Alternative equivalent models are necessary when specific flange configurations, contact material specifications, or shell plating requirements differ from the standard L77DD50SV design.

Substiute Parts

L77DD50SV

Amphenol ICC (Commercial Products)In Stock: 1143L77DD50SV Datasheet

Current PartRFQ

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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Key Parameters

Substitute Part Grouping Explanation

The L77DD50SV D-Sub receptacle connector is electrically and mechanically compatible with substitute parts that maintain the following critical parameters: 50-position configuration, DD/D shell size, through-hole mounting, solder termination, 300V voltage rating, -55°C to 125°C operating temperature range, female socket contact type, and UL94 V-0 flammability rating.

The three substitute models (D50S24A4GV00LF, D50S24A4GX00LF, D50S24A4PA00LF) are manufactured by Amphenol ICC (FCI) within the Delta D series. These parts differ from the L77DD50SV in the following specifications:

Allowed variation parameters for substitution:

• Shell material finish: Tin-Nickel plating (alternative to tin plating)
• Contact material: Phosphor Bronze (alternative to brass)
• Contact finish thickness: Flash (alternative to 8.00µin thickness)
• Flange configuration: Mating-side female screwlock (4-40), housing-side threading (4-40), or unthreaded housing
• Dielectric material: Polybutylene Terephthalate (PBT) (alternative to thermoplastic, glass filled)
• Current rating: 5A per contact (alternative to 7.5A)
• Additional features: Board Lock functionality

Parameter Comparison

Engineering Selection Recommendations

All four connector models maintain active production status and full RoHS compliance. The L77DD50SV provides higher current rating capacity (7.5A) compared to the substitute parts (5A per contact), which affects suitability for high-current applications.

D50S24A4PA00LF is the most functionally equivalent to L77DD50SV, matching the unthreaded flange configuration. However, REACH status differs for this part (REACH Affected vs. REACH Unaffected for L77DD50SV), requiring evaluation against specific regulatory requirements.

D50S24A4GV00LF includes mating-side female screwlock (4-40) and Board Lock features, providing enhanced mechanical retention compared to the standard L77DD50SV.

D50S24A4GX00LF incorporates housing-side threading (4-40) and Board Lock features, offering threaded flange mounting compatibility distinct from the unthreaded L77DD50SV design.

Material composition differences (phosphor bronze contacts vs. brass, thermoplastic glass-filled dielectric vs. PBT) and shell plating (tin-nickel vs. tin) represent the primary technical deviations. All substitute parts maintain compatible electrical performance across the specified voltage and temperature operating ranges within their individual current ratings.

Frequently Asked Questions (FAQ)

Q: Can the D50S24A4PA00LF directly replace the L77DD50SV in existing designs? A: Direct mechanical and electrical replacement is feasible with unthreaded flange configurations. The lower current rating (5A per contact vs. 7.5A) requires circuit validation. REACH compliance status differs and must be assessed against specific regulatory requirements.

Q: What is the functional difference between the three substitute parts? A: All three maintain the same electrical specifications (50 positions, 300V, -55°C to 125°C). Differences are confined to flange mechanical features and retention characteristics: D50S24A4GV00LF features mating-side screwlock mounting with Board Lock; D50S24A4GX00LF offers housing-side threaded mounting with Board Lock; D50S24A4PA00LF provides unthreaded housing without Board Lock.

Q: Does the contact material change (brass to phosphor bronze) affect electrical performance? A: Both brass and phosphor bronze are acceptable contact materials for D-Sub connector applications. The gold finish on both materials ensures equivalent electrical contact resistance and durability within their respective current ratings.

Q: How do the dielectric material differences impact application suitability? A: Thermoplastic glass-filled material and polybutylene terephthalate (PBT) both maintain the UL94 V-0 flammability rating and operate across the identical temperature range (-55°C to 125°C). Material selection impacts mechanical robustness and environmental resistance but does not affect electrical specifications.

Q: Are there inventory considerations when selecting substitute parts? A: Current availability shows L77DD50SV at 1096 units, D50S24A4GX00LF at 1174 units, D50S24A4GV00LF at 1141 units, and D50S24A4PA00LF at 854 units. Stock levels may influence procurement timeline and logistics planning.