L77DDH50SAM4B

Part Overview

The L77DDH50SAM4B is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole, right-angle solder-terminated connector features female sockets and is designed for applications requiring robust interconnection in industrial and commercial environments. The part maintains active product status and is fully RoHS compliant. Identifying equivalent and substitute parts is necessary to ensure design flexibility, procurement availability, and cost optimization while maintaining electrical and mechanical compatibility.

Substiute Parts

L77DDH50SAM4B

Amphenol ICC (Commercial Products)In Stock: 1120L77DDH50SAM4B Datasheet

Current PartRFQ

DD50S565MTLF

Amphenol ICC (FCI)In Stock: 1128DD50S565MTLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for D-Sub receptacle connectors is determined by electrical and mechanical compatibility parameters. The primary criteria are: number of positions (50), number of rows (3), shell size and layout (5 DD, D), connector type (receptacle, female sockets), mounting type (through hole, right angle), and termination method (solder).

The substitute part DD50S565MTLF meets these core requirements, maintaining the same 50-position configuration, 3-row arrangement, and shell size. Both parts operate within the same voltage rating (300V) and temperature range (-55°C to 125°C), ensuring thermal compatibility. Both incorporate UL94 V-0 flammability ratings and maintain RoHS compliance, satisfying regulatory requirements for equivalent applications.

Key differentiating parameters between the main part and substitute include current rating per contact and backset spacing, which are documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

Both the L77DDH50SAM4B and DD50S565MTLF maintain active product status and full RoHS compliance, qualifying both for equivalent applications in regulated environments. The selection between these parts depends on specific current requirements and physical constraints.

The L77DDH50SAM4B supports 7.5A per contact and incorporates a larger backset spacing (0.590"), suitable for applications requiring higher current density or specific board layout requirements. The DD50S565MTLF provides 5A per contact capacity with a smaller backset spacing (0.370"), accommodating compact board designs where space constraints are a primary consideration.

Both parts meet UL94 V-0 flammability certification and maintain identical voltage ratings and operating temperature ranges. The contact material difference (brass versus phosphor bronze) and enhanced gold contact finish (GXT™) in the substitute part represent incremental material improvements that may benefit applications with stringent contact resistance or corrosion resistance requirements.

Frequently Asked Questions (FAQ)

Q: Can DD50S565MTLF be directly substituted for L77DDH50SAM4B in existing designs?

A: Direct substitution is possible if the application current requirements do not exceed 5A per contact and the board layout accommodates the smaller backset spacing of 0.370" (9.40mm). The L77DDH50SAM4B features a larger 0.590" (14.99mm) backset spacing, so physical requalification is necessary if current PCB designs rely on the original spacing.

Q: What is the significance of backset spacing in D-Sub connector substitution?

A: Backset spacing defines the distance from the connector's mounting flange to the point of solder contact on the printed circuit board. This dimension directly affects PCB footprint design and component placement. Substitution requires backset spacing compatibility unless the PCB layout can be modified.

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

A: Both parts satisfy UL94 V-0 flammability requirements and maintain RoHS compliance, supporting use in regulated applications. The identical operating temperature range (-55°C to 125°C) and voltage rating (300V) ensure thermal and electrical compatibility in standardized industrial environments.

Q: How do contact material differences affect connector performance?

A: L77DDH50SAM4B utilizes brass contacts, while DD50S565MTLF employs phosphor bronze. Phosphor bronze offers improved spring characteristics and fatigue resistance. Combined with the enhanced gold finish (GXT™) in the substitute part, this configuration may provide superior contact reliability in applications subject to repeated mating cycles.

Q: Is inventory availability a factor in part selection?

A: Both parts are maintained in active stock (L77DDH50SAM4B: 1010 pcs; DD50S565MTLF: 1018 pcs). Current inventory levels indicate consistent availability for both options.