977-050-020-121 D-Sub Backshell Connector Equivalent & Substitute Parts

Part Overview

The 977-050-020-121 is a 50-position two-piece backshell connector manufactured by NorComp Inc., designed for D-Sub applications with 180° cable exit and shielded configuration. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain supply chain continuity for applications requiring this connector type.

Substiute Parts

977-050-020-121

NorComp Inc.In Stock: 968977-050-020-121 Datasheet

Current PartRFQ

977-050-020R121

NorComp Inc.In Stock: 959977-050-020R121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 977-050-020R121 qualifies as a direct substitute for the 977-050-020-121 based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Number of positions: 50
• Compatible shell size: D
• Compatible D-Sub size: 50pos and HD78pos
• Cable exit angle: 180°
• Shielding configuration: Shielded
• Accessory type: Two piece backshell
• Cable type: Round
• Plating specification: Nickel over Copper
• Hardware configuration: Assembly hardware with strain relief
• Mating feature: 4-40 mating screws

The substitute part maintains full compatibility with the original specification while offering improved product status and compliance posture.

Parameter Comparison

Engineering Selection Recommendations

The 977-050-020R121 is the appropriate selection for new designs and component replenishment. This part maintains identical electrical and mechanical specifications to the obsolete 977-050-020-121 while offering the following advantages:

• Active product status ensures ongoing availability and manufacturer support
• ROHS3 compliance satisfies current regulatory requirements for electronic components
• Bulk packaging accommodates production and inventory management requirements

The transition from 977-050-020-121 to 977-050-020R121 requires no design modifications, as all functional parameters remain unchanged.

Frequently Asked Questions (FAQ)

Q: Are the 977-050-020-121 and 977-050-020R121 mechanically interchangeable?

A: Yes. Both parts share identical mechanical specifications including shell size, position count, cable exit angle, and hardware configuration. Direct substitution is valid without modification to connector mounting or cable routing.

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

A: The primary differences are product status and compliance. The 977-050-020R121 is an active product with ROHS3 compliance, while the 977-050-020-121 is obsolete and RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Can the 977-050-020R121 be used in applications originally designed for the 977-050-020-121?

A: Yes. The substitute part maintains full compatibility with all original specifications. No circuit design, connector interface, or mechanical assembly changes are required.

Q: What packaging options are available for the 977-050-020R121?

A: The 977-050-020R121 is supplied in bulk packaging, suitable for production environments and inventory management.

Q: Does the ROHS3 compliance of the 977-050-020R121 affect its performance characteristics?

A: No. ROHS3 compliance reflects material composition standards and does not alter electrical performance, mechanical fit, or functional characteristics relative to the original part.