974-050-020-121 D-Sub Backshell Connector Equivalent & Substitute Parts

Part Overview

The 974-050-020-121 is a 50-position two-piece backshell connector manufactured by NorComp Inc., designed for D-Sub applications with a 40° cable exit angle and shielded configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and procurement planning. The substitute part maintains identical electrical and mechanical specifications while offering improved product status and compliance characteristics.

Substiute Parts

974-050-020-121

NorComp Inc.In Stock: 701974-050-020-121 Datasheet

Current PartRFQ

974-050-020R121

NorComp Inc.In Stock: 797974-050-020R121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 974-050-020-121 with the 974-050-020R121 is based on strict equivalence across all critical electrical and mechanical parameters. Both parts share identical specifications for:

• Number of positions (50)
• Compatible shell size (D)
• Compatible D-Sub sizes (50pos and HD78pos)
• Cable exit angle (40°)
• Shielding configuration (Shielded)
• Accessory type (Two Piece Backshell)
• Cable type (Round)
• Material composition (Plastic, Metallized)
• Plating specification (Nickel over Copper)
• Hardware configuration (Assembly Hardware, Strain Relief)
• Mating screw specification (4-40)
• Color (Silver)

The substitute part differs only in product status (Active vs. Obsolete), packaging format (Bulk vs. standard), and compliance certifications, with no impact on form, fit, or function.

Parameter Comparison

Engineering Selection Recommendations

The 974-050-020R121 is the direct equivalent substitute for the obsolete 974-050-020-121. Selection of the substitute part is supported by:

• Identical form, fit, and function across all electrical and mechanical parameters
• Active product status ensuring continued availability and supply chain support
• ROHS3 compliance certification, providing enhanced regulatory alignment compared to the non-compliant original part
• Equivalent REACH and ECCN classifications
• Same series designation (974) and base product number (974-050)

For applications requiring the specific electrical and mechanical characteristics of the 974-050-020-121, the 974-050-020R121 provides full compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Are the 974-050-020-121 and 974-050-020R121 electrically identical?

A: Yes. Both parts share identical specifications for position count (50), shielding configuration, cable exit angle (40°), plating (Nickel over Copper), and all electrical interface parameters.

Q: What is the primary difference between these two parts?

A: The 974-050-020R121 is an active product with ROHS3 compliance, while the 974-050-020-121 is obsolete and RoHS non-compliant. Mechanical and electrical specifications are identical.

Q: Can the 974-050-020R121 be used as a direct replacement in existing designs?

A: Yes. The substitute part maintains identical form, fit, and function. No design modifications are required for integration into systems currently using the 974-050-020-121.

Q: Are there packaging differences between these parts?

A: The 974-050-020R121 is available in Bulk packaging, while the original part uses standard packaging. This does not affect component functionality or compatibility.

Q: What compatibility does this backshell have with D-Sub connectors?

A: This 50-position backshell is compatible with both 50pos and HD78pos D-Sub connector sizes in the D shell size category.

Q: Is the 974-050-020R121 suitable for new designs?

A: Yes. As an active product with current compliance certifications, the 974-050-020R121 is appropriate for both new designs and replacement applications.