L77DD50SA D-Sub 50 Position Receptacle Connector

Part Overview

The L77DD50SA is a 50 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets in a right-angle, through-hole solder termination configuration with a DD shell size. The part is currently active in production with 1030 units in stock.

D-Sub connectors of this type are essential in applications requiring high-density signal transmission with standardized mechanical and electrical interfaces. Alternative models may be required due to inventory constraints, specific backset spacing requirements, contact material preferences, or current rating specifications for particular application demands.

Substiute Parts

L77DD50SA

Amphenol ICC (Commercial Products)In Stock: 1052L77DD50SA Datasheet

Current PartRFQ

DD50S565MTLF

Amphenol ICC (FCI)In Stock: 1128DD50S565MTLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The DD50S565MTLF qualifies as a substitute for the L77DD50SA based on the following matching parameters:

Matching Criteria:

• Connector style: D-Sub receptacle, female sockets
• Position count: 50 positions
• Shell size: 5 (DD, D)
• Mounting configuration: Through hole, right angle
• Termination method: Solder
• Flange feature: Housing/Shell (Unthreaded)
• Voltage rating: 300V
• Operating temperature range: -55°C ~ 125°C
• Material flammability: UL94 V-0
• RoHS compliance: Yes
• Moisture sensitivity level: 1 (Unlimited)

Differing Parameters: The substitute part exhibits variations in backset spacing (0.370" vs 0.319"), current rating per contact (5A vs 7.5A), contact material (Phosphor Bronze vs Brass), contact finish thickness (30.0µin vs 8.00µin), and contact finish specification (Gold, GXT™ vs standard Gold). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the L77DD50SA and DD50S565MTLF are active production parts with RoHS compliance and identical environmental ratings (UL94 V-0, MSL 1). Selection between these parts depends on application-specific requirements:

Select L77DD50SA when:

• Higher current capacity per contact is required (7.5A vs 5A)
• Backset spacing of 0.319" (8.10mm) is specified in PCB layout
• Brass contact material is preferred for specific impedance or corrosion characteristics

Select DD50S565MTLF when:

• Backset spacing of 0.370" (9.40mm) is required
• Enhanced contact durability is needed (thicker gold plating at 30.0µin)
• Phosphor Bronze contact material is specified
• GXT™ gold finish specification is required

Both parts maintain identical voltage ratings (300V), operating temperature ranges (-55°C ~ 125°C), and comply with RoHS and REACH requirements. Mechanical compatibility with mounting brackets is confirmed for both variants.

Frequently Asked Questions (FAQ)

Q: Can DD50S565MTLF be used as a direct replacement for L77DD50SA?

A: Mechanical and electrical compatibility exists for the core connector function. However, the differing backset spacing (0.370" vs 0.319") requires PCB layout verification. Current rating differences (5A vs 7.5A per contact) must be evaluated against circuit requirements. Contact material and finish specifications differ and may affect performance in specific environments.

Q: What is the significance of backset spacing differences?

A: Backset spacing determines the distance from the mounting flange to the contact plane. The 0.051" (1.30mm) difference between these parts affects PCB footprint compatibility and mating depth. Verify PCB design specifications before substitution.

Q: How do contact material differences affect performance?

A: Brass (L77DD50SA) and Phosphor Bronze (DD50S565MTLF) exhibit different mechanical properties and corrosion resistance. Phosphor Bronze provides higher spring force retention. Contact finish thickness also differs (8.00µin vs 30.0µin), affecting wear resistance and contact life in high-cycle applications.

Q: Are both parts suitable for high-reliability applications?

A: Both parts meet UL94 V-0 flammability requirements and maintain MSL 1 moisture sensitivity ratings. RoHS compliance is confirmed for both. Selection should be based on specific reliability standards and environmental conditions of the application.

Q: What packaging considerations apply to these parts?

A: Both parts are supplied in tray packaging as new original stock. Inventory availability is comparable (1030 vs 1018 units). Handling and storage requirements are identical per MSL 1 classification.