979-037-020-121 D-Sub Backshell Connector Equivalent & Substitute Parts

Part Overview

The 979-037-020-121 is a 37-position two-piece backshell connector with 180° shielded cable exit, manufactured by NorComp Inc. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system maintenance and new design implementations. The backshell serves as a protective and strain-relief accessory for D-Sub connectors in applications requiring shielded cable management.

Substiute Parts

979-037-020-121

NorComp Inc.In Stock: 881979-037-020-121 Datasheet

Current PartRFQ

979-037-020R121

NorComp Inc.In Stock: 1454979-037-020R121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 979-037-020-121 is determined by strict equivalence across the following critical parameters:

• Number of Positions: Must be 37
• Compatible Shell Size: Must be C
• Compatible D-Sub Size: Must support 37pos and HD62pos
• Cable Exit Angle: Must be 180°
• Shielding Configuration: Must be shielded
• Accessory Type: Must be two-piece backshell
• Cable Type: Must accommodate round cables
• Material Composition: Must be plastic with metallization
• Plating Specification: Must be chrome
• Hardware Configuration: Must include assembly hardware and grommets with 4-40 mating screws

Parts meeting all these parameters are classified as direct functional equivalents and may be substituted without modification to mechanical or electrical interfaces.

Parameter Comparison

Engineering Selection Recommendations

The 979-037-020R121 is the direct functional equivalent of the 979-037-020-121. Both components share identical mechanical and electrical specifications across all critical parameters. The primary distinction is product status and regulatory compliance:

The 979-037-020-121 is classified as obsolete and carries RoHS non-compliant status. The 979-037-020R121 is an active product with ROHS3 compliance certification. For new designs and systems requiring regulatory compliance with modern environmental standards, the 979-037-020R121 is the appropriate selection. For legacy system maintenance where the original part specification must be preserved, the 979-037-020-121 remains functionally interchangeable.

Both parts are manufactured by NorComp Inc. under the same series designation (979-037) and maintain identical mechanical interfaces, shielding characteristics, and hardware specifications.

Frequently Asked Questions (FAQ)

Q: Can the 979-037-020R121 be used as a direct replacement for the 979-037-020-121?

A: Yes. Both components are mechanically and electrically identical across all functional parameters. The 979-037-020R121 is the active production equivalent with updated RoHS3 compliance.

Q: What are the key compatibility requirements for substitution?

A: The substitute part must maintain 37-position configuration, shell size C, 180° cable exit angle, shielded construction, two-piece backshell design, chrome plating, and 4-40 mating screws. Any deviation from these parameters indicates incompatibility.

Q: Does the packaging difference between the two parts affect compatibility?

A: No. Packaging format (bulk versus other configurations) does not affect mechanical or electrical compatibility. It pertains only to order quantity and logistics considerations.

Q: What is the significance of the RoHS compliance difference?

A: The 979-037-020R121 meets ROHS3 environmental compliance standards, making it suitable for applications and markets requiring regulatory adherence. The 979-037-020-121 does not meet these standards. Selection depends on system requirements and applicable regulations.

Q: Are there any cable type restrictions for these backshells?

A: Both components are specified for round cable types only. Flat or ribbon cable configurations are not compatible with these backshell designs.