NorComp 993-025-020-121 D-Sub Backshell Connector: Equivalent & Substitute Parts

Part Overview

The NorComp 993-025-020-121 is a 25-position two-piece backshell connector with 45° cable exit and shielding, 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 substitute part maintains identical electrical and mechanical specifications while offering improved product status and compliance posture.

Substiute Parts

993-025-020-121

NorComp Inc.In Stock: 754993-025-020-121 Datasheet

Current PartRFQ

993-025-020R121

NorComp Inc.In Stock: 1290993-025-020R121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The NorComp 993-025-020R121 qualifies as a direct substitute for the 993-025-020-121 based on strict parameter equivalence across all critical electrical and mechanical specifications. Substitution is valid when the following parameters match identically:

• Number of Positions: 25
• Accessory Type: Two Piece Backshell
• Compatible Shell Size: B
• Compatible D-Sub Size: 25pos and HD44pos
• Cable Exit Angle: 45°
• Cable Type: Round
• Shielding: Shielded
• Primary Material: Plastic, Metallized
• Plating: Chrome
• Hardware: Assembly Hardware, Strain Relief
• Mating Features: Mating Screws 4-40
• Color: Silver

The substitute part differs only in product status (Active vs. Obsolete), packaging format (Bulk vs. standard), RoHS compliance level, and inventory availability—factors that do not affect functional or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The NorComp 993-025-020R121 is the appropriate selection for new designs and procurement activities. This part maintains full functional and mechanical equivalence to the obsolete 993-025-020-121 while offering the following advantages:

• Active product status ensures long-term availability and manufacturer support
• ROHS3 compliance satisfies current regulatory requirements for electronic components
• Higher inventory availability (1277 units vs. 678 units) supports production schedules
• Bulk packaging format accommodates high-volume manufacturing operations

For legacy system maintenance where the original 993-025-020-121 is specified, the 993-025-020R121 provides direct substitution without design modification or re-qualification requirements.

Frequently Asked Questions (FAQ)

Q: Can the 993-025-020R121 replace the 993-025-020-121 in existing assemblies?

A: Yes. Both parts are mechanically and electrically identical across all functional parameters. The substitute part is compatible with the same D-Sub connector sizes (25pos and HD44pos), shell size B, and cable configurations.

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

A: The primary differences are product status (Active vs. Obsolete), RoHS compliance level (ROHS3 vs. non-compliant), and packaging format (Bulk vs. standard). All electrical and mechanical specifications are identical.

Q: Does the RoHS compliance difference affect compatibility?

A: No. RoHS compliance is a regulatory and supply chain attribute that does not alter the physical or electrical performance of the backshell connector. Both parts function identically in the application.

Q: Which part should be specified for new designs?

A: The 993-025-020R121 should be specified for new designs due to its active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Q: Are there packaging considerations when switching between these parts?

A: The 993-025-020R121 is supplied in bulk packaging, which is standard for high-volume procurement. If specific packaging requirements exist, confirm with the supplier before ordering.

Q: What is the base product number for these backshells?

A: The base product number is 993-025, which identifies the 25-position backshell family within the NorComp 993 series.