NorComp 974-025-020-121 D-Sub Backshell Connector: Equivalent & Substitute Parts

Part Overview

The NorComp 974-025-020-121 is a 25-position two-piece backshell connector with 40° cable exit angle and shielding 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 backshell provides mechanical strain relief, shielding, and cable management for 25-position D-Sub connectors in round cable configurations.

Substiute Parts

974-025-020-121

NorComp Inc.In Stock: 1046974-025-020-121 Datasheet

Current PartRFQ

974-025-020R121

NorComp Inc.In Stock: 1232974-025-020R121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 974-025-020R121 qualifies as a direct equivalent based on the following critical parameters:

• Number of Positions: 25 (identical)
• Compatible Shell Size: B (identical)
• Compatible D-Sub Size: 25pos and HD44pos (identical)
• Cable Exit Angle: 40° (identical)
• Shielding: Shielded (identical)
• Cable Type: Round (identical)
• Accessory Type: Two Piece Backshell (identical)
• Material Composition: Plastic, Metallized (identical)
• Plating Specification: Nickel over Copper (identical)
• Hardware Configuration: Assembly Hardware, Strain Relief with 4-40 Mating Screws (identical)
• Color: Silver (identical)

The primary distinction is product status: the original part is obsolete, while the substitute is active. The substitute also carries ROHS3 compliance, whereas the original is non-compliant.

Parameter Comparison

Engineering Selection Recommendations

The NorComp 974-025-020R121 is the direct substitute for the obsolete 974-025-020-121. All mechanical and electrical parameters are identical, ensuring drop-in compatibility in existing designs. The substitute part is currently in active production status with 1169 units in stock, compared to 989 units of the obsolete original.

For new designs or system refreshes, the 974-025-020R121 is the appropriate selection. This part carries ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the original part does not. Both parts maintain identical REACH and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can the 974-025-020R121 be used as a direct replacement for the 974-025-020-121?

A: Yes. All functional, mechanical, and electrical parameters are identical. The substitute part is mechanically and electrically compatible with existing assemblies designed for the original part.

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

A: The original 974-025-020-121 is obsolete, while the substitute 974-025-020R121 is active in production. The substitute also carries ROHS3 compliance, whereas the original is non-compliant.

Q: Are there any compatibility concerns with the 40° cable exit angle?

A: No. Both parts feature identical 40° cable exit angles and are compatible with 25-position and HD44-position D-Sub connectors with shell size B.

Q: What is the difference in packaging between these parts?

A: The original part packaging is not specified. The substitute is supplied in bulk packaging.

Q: Do both parts support shielded configurations?

A: Yes. Both parts are shielded two-piece backshells with identical material composition (plastic, metallized) and nickel over copper plating.

Q: Are there any regulatory or compliance differences?

A: The substitute part (974-025-020R121) is ROHS3 compliant, while the original (974-025-020-121) is non-compliant. Both parts are REACH unaffected and classified as EAR99 for export control purposes.