172-E50-201R021 D-Sub 50 Position Receptacle Connector Equivalent & Substitute Parts

Part Overview

The 172-E50-201R021 is a 50 position D-Sub receptacle connector manufactured by NorComp Inc., designed for panel mount applications with solder cup termination. This connector features female sockets, machined contacts, and is rated for 5A continuous current with an operating temperature range of -50°C to 100°C. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and component procurement.

Substiute Parts

172-E50-201R021

NorComp Inc.In Stock: 1279172-E50-201R021 Datasheet

Current PartRFQ

172-E50-203R021

NorComp Inc.In Stock: 1109172-E50-203R021 Datasheet

SimilarRFQ

L77DD50S

Amphenol ICC (Commercial Products)In Stock: 1131L77DD50S Datasheet

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L77DDG50S

Amphenol ICC (Commercial Products)In Stock: 961L77DDG50S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 172-E50-201R021 is determined by the following critical parameters: connector style (D-Sub), connector type (receptacle with female sockets), position count (50), row configuration (3), shell size (5/DD), termination method (solder cup), and contact type (signal). All substitute parts must maintain these core specifications to ensure mechanical and electrical compatibility.

The substitute parts are grouped into two categories based on mounting configuration:

Category 1: Panel Mount Substitutes — Parts maintaining the original panel mount configuration with cable-side flange features.

Category 2: Free Hanging Substitutes — Parts with alternative mounting configurations suitable for in-line applications where panel mount is not required.

Parameter Comparison

Engineering Selection Recommendations

172-E50-203R021 is the primary direct substitute for the 172-E50-201R021. Both connectors are manufactured by NorComp Inc., share identical mechanical and electrical specifications, and maintain the same panel mount configuration. The 172-E50-203R021 is currently in active production status and meets ROHS3 compliance requirements, addressing the regulatory limitations of the obsolete original part. Shell finish differs (nickel plated versus yellow chromate plated), but both finishes provide equivalent corrosion protection for the specified operating environment.

L77DD50S and L77DDG50S are functionally equivalent alternatives manufactured by Amphenol ICC. These parts maintain the 50 position, 3 row, DD shell size configuration with solder cup termination and gold contact finish. Both Amphenol alternatives provide enhanced current rating (7.5A versus 5A) and extended operating temperature range (-55°C to 125°C versus -50°C to 100°C). The primary distinction between these alternatives is mounting configuration: L77DD50S features housing/shell unthreaded flange, while L77DDG50S includes cable-side M3 flange with 0.319" backset spacing. Selection between these alternatives depends on application mounting requirements. Both parts are RoHS compliant and actively produced.

Frequently Asked Questions (FAQ)

Q: Can the 172-E50-203R021 be used as a direct replacement for the 172-E50-201R021?

A: Yes. Both connectors share identical position count (50), row configuration (3), shell size (DD/5), mounting type (panel mount), termination method (solder cup), and electrical ratings (5A, -50°C to 100°C). The 172-E50-203R021 is the recommended substitute due to active production status and ROHS3 compliance.

Q: What are the key differences between NorComp and Amphenol substitute options?

A: The NorComp 172-E50-203R021 maintains identical specifications to the original part with updated compliance status. Amphenol alternatives (L77DD50S and L77DDG50S) provide higher current rating (7.5A) and extended temperature range (-55°C to 125°C), with different mounting configurations. Selection depends on whether panel mount configuration is required or if free hanging in-line mounting is acceptable.

Q: Are the Amphenol L77DD50S and L77DDG50S interchangeable?

A: Both connectors are mechanically and electrically equivalent with identical position count, current rating, and temperature range. The primary difference is flange configuration: L77DD50S has unthreaded housing flange, while L77DDG50S includes M3 cable-side flange with 0.319" backset spacing. Selection depends on specific mounting requirements.

Q: Does shell material finish affect connector performance?

A: Shell finish (yellow chromate, nickel, or tin plating) provides corrosion protection appropriate for the operating environment. All finishes specified for these connectors are suitable for standard industrial applications. Selection may be driven by environmental exposure or specific system requirements.

Q: Are all substitute parts RoHS compliant?

A: The 172-E50-203R021 meets ROHS3 compliance. Both Amphenol alternatives (L77DD50S and L77DDG50S) are RoHS compliant. The original 172-E50-201R021 is RoHS non-compliant. Compliance status should be verified against specific application regulatory requirements.