NorComp 979-025-020-121 D-Sub Backshell Connector: Equivalent & Substitute Parts

Part Overview

The NorComp 979-025-020-121 is a 25-position two-piece backshell connector with 180° shielded cable exit, designed for D-Sub applications. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system support and new procurement cycles. The connector accommodates both 25-position and HD44-position D-Sub sizes with shell size B compatibility.

Substiute Parts

979-025-020-121

NorComp Inc.In Stock: 902979-025-020-121 Datasheet

Current PartRFQ

979-025-020R121

NorComp Inc.In Stock: 953979-025-020R121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 979-025-020-121 is determined by strict equivalence across the following critical parameters:

• Accessory Type: Two Piece Backshell (identical)
• Number of Positions: 25 (identical)
• Compatible Shell Size: B (identical)
• Compatible D-Sub Size: 25pos and HD44pos (identical)
• Cable Exit Angle: 180° (identical)
• Shielding: Shielded (identical)
• Cable Type: Round (identical)
• Material Composition: Plastic, Metallized (identical)
• Plating: Chrome (identical)
• Hardware Configuration: Assembly Hardware, Grommets, Mating Screws 4-40 (identical)

The substitute part 979-025-020R121 maintains full electrical and mechanical compatibility with the original specification while offering improved product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The 979-025-020R121 is the direct active equivalent for the obsolete 979-025-020-121. Both components share identical mechanical and electrical specifications for D-Sub backshell applications. The substitute part offers the additional advantage of ROHS3 compliance, whereas the original part is RoHS non-compliant. For new designs and ongoing procurement, the 979-025-020R121 provides continuity of function with improved regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the 979-025-020R121 directly replace the 979-025-020-121 in existing assemblies?

A: Yes. Both parts maintain identical specifications for accessory type, position count, shell size compatibility, cable exit angle, shielding, material composition, plating, and hardware configuration. Direct mechanical and electrical substitution is supported.

Q: What is the difference between the two part numbers?

A: The primary differences are product status and regulatory compliance. The 979-025-020-121 is obsolete and RoHS non-compliant. The 979-025-020R121 is active and ROHS3 compliant. All functional parameters remain equivalent.

Q: Are there packaging differences between these parts?

A: The original part number does not specify packaging details. The substitute part is supplied in bulk packaging. Verify packaging requirements for your procurement process.

Q: Does the 180° cable exit angle apply to both parts?

A: Yes. Both the 979-025-020-121 and 979-025-020R121 feature 180° shielded cable exit configuration.

Q: Are these backshells compatible with both 25-position and HD44-position D-Sub connectors?

A: Yes. Both parts are compatible with 25-position and HD44-position D-Sub sizes with shell size B.