Honeywell 73JA50K Equivalent & Substitute Parts

Part Overview

The Honeywell 73JA50K is a 50kΩ 2W wirewound linear potentiometer designed for panel mount applications with a 10-turn adjustment mechanism and solder lug termination. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. The 73JA series has been discontinued, necessitating evaluation of active production alternatives that maintain electrical and mechanical compatibility with existing applications.

Substiute Parts

73JA50K

Honeywell Sensing and Productivity SolutionsIn Stock: 94973JA50K Datasheet

Current PartRFQ

3540S-1-503L

Bourns Inc.In Stock: 11523540S-1-503L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete Honeywell 73JA50K is based on strict electrical and mechanical parameter matching. The following criteria determine functional equivalence:

Electrical Parameters (Critical):

• Resistance value: 50kΩ
• Power rating: 2W
• Tolerance: ±5%
• Taper: Linear
• Number of turns: 10
• Resistive material: Wirewound

Mechanical Parameters (Critical):

• Termination style: Solder Lug
• Mounting type: Panel Mount
• Bushing thread: 3/8-32
• Body diameter: 0.875" (22.23mm)
• Actuator type: Slotted
• Rotation: 3600°

Acceptable Variations:

• Temperature coefficient: Variations within ±50ppm/°C are acceptable for most applications
• Actuator length and diameter: Tolerances within ±0.001" (0.025mm) maintain functional compatibility
• Product status: Active production parts are preferred for long-term availability

The Bourns 3540S-1-503L meets all critical electrical and mechanical parameters and is classified as active production, making it a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 3540S-1-503L is the direct functional equivalent for the obsolete Honeywell 73JA50K based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters are identical, including resistance value, power rating, tolerance, taper, number of turns, and resistive material composition. The temperature coefficient of the Bourns part (±50ppm/°C) is within acceptable operational limits for applications originally designed for the Honeywell part (±20ppm/°C).

Mechanical Compatibility: Panel mount configuration, bushing thread size (3/8-32), body diameter (0.875"), and solder lug termination are identical. Actuator dimensions vary by less than 0.001", maintaining full mechanical interchangeability in standard panel cutout installations.

Compliance and Availability: The Bourns 3540S-1-503L is actively manufactured and carries ROHS3 compliance certification, providing superior long-term supply chain reliability compared to the obsolete Honeywell part. Both components meet EAR99 export classification requirements.

Packaging Consideration: The Bourns part is supplied in tray packaging, which may differ from original Honeywell packaging but does not affect component functionality or installation.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 3540S-1-503L be used as a direct replacement for the Honeywell 73JA50K in existing applications?

A: Yes. All critical electrical and mechanical parameters are identical or compatible. The component will function identically in panel mount applications with 3/8-32 bushing thread installations and solder lug termination.

Q: What is the significance of the temperature coefficient difference (±20ppm/°C vs. ±50ppm/°C)?

A: The Bourns part has a wider temperature coefficient specification. For applications operating within standard industrial temperature ranges (-40°C to +85°C), this difference produces negligible resistance variation and does not affect functional performance in typical potentiometer applications.

Q: Are there any mechanical installation differences?

A: No. Both components use identical 3/8-32 bushing threads and 0.875" body diameters. Actuator dimensions differ by less than 0.001", which is within standard mechanical tolerances and does not affect panel cutout compatibility or adjustment feel.

Q: Why is the Honeywell 73JA50K classified as obsolete?

A: The 73JA series has been discontinued by Honeywell Sensing and Productivity Solutions. The Bourns 3540S-1-503L represents the active production alternative that maintains full functional equivalence.

Q: Does the packaging difference (tray vs. original packaging) affect component quality?

A: No. Packaging format does not affect component electrical or mechanical properties. Tray packaging is standard for active production components and provides equivalent protection during storage and handling.

Q: Are both components RoHS compliant?

A: Yes. The Honeywell 73JA50K is RoHS Compliant, and the Bourns 3540S-1-503L is ROHS3 Compliant, indicating compliance with current and updated RoHS directives.