73JA2K Wirewound Potentiometer Equivalent & Substitute Parts

Part Overview

The Honeywell 73JA2K is a 2 kΩ, 2W wirewound linear potentiometer designed for panel mount applications with a 10-turn adjustment mechanism. This component features solder lug termination and is rated for ±5% tolerance with a temperature coefficient of ±20ppm/°C. The 73JA2K is classified as obsolete, making identification of compatible substitute components essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

73JA2K

Honeywell Sensing and Productivity SolutionsIn Stock: 81773JA2K Datasheet

Current PartRFQ

3540S-1-202L

Bourns Inc.In Stock: 11043540S-1-202L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 73JA2K is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Resistance value (2 kΩ), power rating (2W), tolerance (±5%), taper type (linear), and number of turns (10) must match exactly.

Mechanical Parameters: Termination style (solder lug), mounting type (panel mount), bushing thread specification (3/8-32), and body diameter (0.875" / 22.23mm) must be identical to ensure physical and electrical compatibility.

Material Specification: Resistive material must be wirewound to maintain performance characteristics under the specified power and temperature conditions.

The Bourns 3540S-1-202L meets all these critical substitution criteria, providing functional equivalence despite differences in temperature coefficient and product status.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 3540S-1-202L serves as a direct functional substitute for the obsolete Honeywell 73JA2K across all critical electrical and mechanical parameters. Both components are RoHS compliant, meeting environmental regulatory requirements for current manufacturing and deployment.

The primary technical difference is the temperature coefficient specification: the 73JA2K operates at ±20ppm/°C while the 3540S-1-202L operates at ±50ppm/°C. This difference is acceptable in applications where the broader temperature coefficient of the substitute does not exceed system-level tolerance requirements.

The 3540S-1-202L carries active product status from Bourns, ensuring ongoing availability and supply chain continuity compared to the obsolete 73JA2K. This status transition makes the Bourns component the preferred selection for new designs and replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the 3540S-1-202L directly replace the 73JA2K in existing assemblies?

A: Yes. The 3540S-1-202L provides direct mechanical and electrical substitution. Both components share identical resistance (2 kΩ), power rating (2W), tolerance (±5%), termination style (solder lug), mounting configuration (panel mount), and bushing thread specification (3/8-32). Physical dimensions and rotation characteristics are equivalent.

Q: What is the significance of the temperature coefficient difference?

A: The 73JA2K specifies ±20ppm/°C while the 3540S-1-202L specifies ±50ppm/°C. This represents a wider temperature stability range for the substitute. Applications requiring the tighter temperature coefficient of the original component must evaluate whether the broader specification of the substitute exceeds system tolerance budgets.

Q: Why is the 73JA2K listed as obsolete?

A: Obsolete status indicates the component is no longer manufactured by Honeywell. The 3540S-1-202L, maintained in active production by Bourns, provides functional continuity for applications requiring this potentiometer specification.

Q: Are there packaging differences between these components?

A: The 73JA2K is supplied in standard packaging, while the 3540S-1-202L is supplied in tray packaging. Both are suitable for solder lug termination and panel mount installation. Packaging format does not affect electrical or mechanical performance.

Q: Do both components meet current compliance standards?

A: Yes. The 73JA2K is RoHS Compliant, and the 3540S-1-202L is ROHS3 Compliant. Both meet current environmental and regulatory requirements. The 3540S-1-202L additionally carries REACH Affected status, indicating compliance with European chemical regulation frameworks.