Cinch Connectivity Solutions 51B Terminal Lug Strip Equivalent & Substitute Parts

Part Overview

The Cinch Connectivity Solutions 51B is a 2-position terminal lug strip with single-end terminal lugs and integrated ground position. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. The 51B provides a compact solution for applications requiring dual-position terminal connectivity with a standardized mounting interface.

Substiute Parts

51B

Cinch Connectivity SolutionsIn Stock: 91051B Datasheet

Current PartRFQ

803

Keystone ElectronicsIn Stock: 1520803 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 51B is determined by the following critical parameters:

• Terminal configuration: 2-position terminal lug strip with single-end lugs and ground position
• Mounting interface: 0.140" (4.66mm) mounting hole diameter
• Electrical connectivity: Single row, dual-position architecture
• Compliance baseline: RoHS compliance requirement

The Keystone Electronics 803 satisfies these core substitution criteria. Both components provide identical terminal lug positioning, matching mounting hole specifications, and equivalent single-row configuration. The 803 maintains RoHS compliance (ROHS3 Compliant) and operates within the same moisture sensitivity classification (MSL 1).

Differences in board material composition (XPC versus XP Phenolic), contact metallurgy (Steel/Cadmium versus Brass/Tin), and physical board dimensions do not preclude functional substitution when mounting hole alignment and terminal lug positioning remain consistent.

Parameter Comparison

Engineering Selection Recommendations

The Keystone Electronics 803 is the qualified substitute for the obsolete Cinch 51B. Selection is based on:

• Identical terminal lug configuration and positioning
• Matching mounting hole diameter (0.140" / 4.66mm)
• Equivalent single-row, dual-position architecture
• Active product status with current manufacturing support
• ROHS3 compliance exceeds the RoHS Compliant baseline of the 51B
• MSL 1 classification ensures compatibility with standard handling and storage protocols

The 803 is available in bulk packaging with 1468 units in current inventory, providing supply continuity for replacement and new applications.

Frequently Asked Questions (FAQ)

Q: Can the Keystone 803 directly replace the Cinch 51B in existing assemblies?

A: Yes. Both components share identical mounting hole diameter (0.140" / 4.66mm) and terminal lug positioning. Physical board dimensions differ, but this does not affect functional compatibility when mounting hole alignment is maintained.

Q: What are the material differences between these components?

A: The 51B uses steel contacts with cadmium finish on an XPC board. The 803 uses brass contacts with tin finish on an XP Phenolic board. These material variations do not compromise electrical performance for standard terminal lug applications.

Q: Are there compliance differences?

A: The 803 carries ROHS3 Compliant status, which represents an enhanced compliance level relative to the 51B's RoHS Compliant designation. Both meet current regulatory requirements.

Q: What is the moisture sensitivity classification for both parts?

A: Both the 51B and 803 are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Is the 803 currently available?

A: Yes. The Keystone 803 is active in production with 1468 units in current inventory, available in bulk packaging.