L77DD50STR063 Equivalent & Substitute Parts Reference

Part Overview

The L77DD50STR063 is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This female socket connector features vertical solder termination and is designed for through-hole mounting applications. The connector is currently in active product status with 697 units in stock. D-Sub connectors of this configuration are widely used in industrial control systems, data acquisition equipment, and legacy computing interfaces where reliable signal transmission across multiple channels is required. Substitute parts may be necessary due to supply chain constraints, manufacturing discontinuation of specific variants, or application-specific requirements regarding mounting style, contact material, or environmental ratings.

Substiute Parts

L77DD50STR063

Amphenol ICC (Commercial Products)In Stock: 789L77DD50STR063 Datasheet

Current PartRFQ

172-050-212R001

NorComp Inc.In Stock: 772172-050-212R001 Datasheet

SimilarRFQ

DDM50S332N

Amphenol ICC (FCI)In Stock: 871DDM50S332N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77DD50STR063 is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

• Connector type must be receptacle with female sockets
• Position count must be 50
• Row configuration must be 3
• Shell size must be 5 (DD, D)
• Termination must be solder
• Mounting must accommodate through-hole installation

Secondary Compatibility Criteria:

• Current rating must meet or exceed 7.5A
• Voltage rating must meet or exceed 300V
• Operating temperature range must encompass -55°C to 125°C or be compatible with application requirements
• Flammability rating must meet UL94 V-0 or equivalent safety standard
• Contact finish must provide equivalent or superior corrosion resistance

Regulatory Compliance Criteria:

• RoHS compliance status must be evaluated against application requirements
• REACH compliance status must be evaluated against application requirements

The substitute parts identified (172-050-212R001 and DDM50S332N) share the core mechanical and electrical architecture with the main part but differ in specific attributes such as mounting configuration, shell finish, contact material composition, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

L77DD50STR063 (Primary Selection)

This part is the recommended choice for new designs and applications requiring RoHS compliance. The connector maintains active product status with established supply availability. The tin-plated steel shell with brass contacts and 8.00µin gold finish provides standard environmental protection. The operating temperature range of -55°C to 125°C accommodates most industrial applications. RoHS compliance status makes this part suitable for applications subject to European Union directives and equivalent regulations.

DDM50S332N (Alternative - Active Status)

This substitute maintains active product status and matches the electrical specifications (7.5A current rating, 300V voltage rating, -55°C to 125°C operating range) of the main part. The phosphor bronze contact material and 50.0µin gold finish provide enhanced contact durability compared to the main part. However, the yellow cadmium plating on the steel shell and RoHS non-compliant status restrict this part to applications where legacy component compatibility or specific contact material properties are required. REACH compliance is affected, requiring evaluation against application regulatory requirements.

172-050-212R001 (Restricted Substitution - Obsolete Status)

This part is obsolete and should be considered only when existing inventory must be utilized or when panel-mount configuration is specifically required. The current rating of 5A is below the main part specification of 7.5A, creating a potential limitation in high-current applications. The operating temperature range of -50°C to 100°C is narrower than the main part, restricting use in extreme temperature environments. The flash gold finish on contacts provides minimal corrosion protection compared to the main part's 8.00µin thickness. ROHS3 compliance and panel-mount capability may be advantageous in specific legacy system retrofits.

Frequently Asked Questions (FAQ)

Q: Can DDM50S332N be used as a direct replacement for L77DD50STR063?

A: DDM50S332N shares identical mechanical configuration (50 positions, 3 rows, shell size 5, through-hole solder termination) and equivalent electrical ratings (7.5A, 300V, -55°C to 125°C). However, the RoHS non-compliant status and REACH-affected designation require regulatory evaluation before substitution. The phosphor bronze contact material and enhanced gold plating (50.0µin versus 8.00µin) represent material differences that may affect contact resistance and wear characteristics in specific applications.

Q: Why is 172-050-212R001 listed as a substitute if it has lower current rating?

A: The 172-050-212R001 is included because it meets the core mechanical and connector architecture requirements (50 positions, 3 rows, shell size 5, solder termination). The 5A current rating represents a functional limitation that restricts its use to applications drawing less than 5A per contact. The part is listed as obsolete, indicating it should be considered only when existing inventory availability or panel-mount configuration requirements justify its use despite the current rating limitation.

Q: What is the significance of contact finish thickness differences?

A: Contact finish thickness directly affects contact resistance stability and service life. The L77DD50STR063 specifies 8.00µin gold plating, the 172-050-212R001 specifies flash gold plating, and the DDM50S332N specifies 50.0µin gold plating. Thicker plating (50.0µin) provides extended protection against contact wear and corrosion in high-cycle mating applications. Flash plating offers minimal protection and is suitable only for low-cycle or protected environments. The 8.00µin specification on the main part represents a standard industrial thickness.

Q: Are there mounting compatibility issues between these parts?

A: The L77DD50STR063 and DDM50S332N are both specified for through-hole mounting and are mechanically compatible. The 172-050-212R001 is specified for panel mount with through-hole capability, meaning it includes additional flange features for panel installation. If the application requires panel-mount configuration, the 172-050-212R001 flange design may provide mechanical advantages. If the application uses standard through-hole PCB mounting without panel integration, the flange on 172-050-212R001 may create clearance issues.

Q: What is the impact of shell material finish differences?

A: The L77DD50STR063 uses tin-plated steel shell, the 172-050-212R001 uses tin-plated steel shell, and the DDM50S332N uses yellow cadmium-plated steel shell. Tin plating provides corrosion resistance suitable for standard industrial environments. Yellow cadmium plating offers superior corrosion resistance in harsh marine and chemical environments but is restricted in RoHS-compliant applications. Shell finish affects EMI shielding effectiveness and environmental durability rather than electrical signal integrity.

Q: Can these parts be intermixed in a multi-connector assembly?

A: Mechanical intermixing is possible due to identical shell size and position configuration. However, electrical and regulatory consistency should be maintained within a single assembly. Mixing RoHS-compliant parts (L77DD50STR063, 172-050-212R001) with RoHS non-compliant parts (DDM50S332N) in the same product may create regulatory compliance documentation complexity. Contact material differences (brass versus phosphor bronze) do not prevent intermixing but may result in inconsistent contact resistance characteristics across the assembly.

Q: What is the operating temperature range significance for substitution?

A: The L77DD50STR063 and DDM50S332N both specify -55°C to 125°C, covering standard industrial temperature extremes. The 172-050-212R001 specifies -50°C to 100°C, which is narrower. Applications operating below -50°C or above 100°C cannot use the 172-050-212R001. Applications operating between -50°C and 100°C can use any of the three parts, but the narrower range on the 172-050-212R001 represents a functional limitation for future temperature excursions.