Honeywell 381L50K Potentiometer - Equivalent & Substitute Parts

Part Overview

The Honeywell 381L50K is a 50k Ohm 1-watt linear panel mount potentiometer featuring conductive plastic resistive material and solder lug termination. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The 381 series potentiometer is designed for user-defined adjustment applications requiring 1-watt power dissipation capability and 300-degree rotation range.

Substiute Parts

381L50K

Honeywell Sensing and Productivity SolutionsIn Stock: 925381L50K Datasheet

Current PartRFQ

3852C-162-503AL

Bourns Inc.In Stock: 7693852C-162-503AL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Honeywell 381L50K is determined by the following critical parameters:

Core Electrical Parameters (Must Match):

• Resistance value: 50k Ohm
• Tolerance: ±10%
• Taper: Linear
• Number of gangs: 1
• Number of turns: 1
• Termination style: Solder Lug

Mechanical Parameters (Must Match):

• Mounting type: Panel Mount
• Bushing thread: 1/4-32
• Actuator type: Slotted
• Actuator diameter: 0.125" (3.18mm)

Flexible Parameters (May Vary Within Limits):

• Power rating: Equal to or greater than 1W
• Rotation angle: Equal to or greater than 300°
• Resistive material: Alternative materials acceptable if electrical performance maintained
• Body size: Minor variations acceptable if mounting compatibility preserved

The Bourns 3852C-162-503AL meets all core electrical and mechanical requirements while offering enhanced power rating (2W) and alternative resistive material (Cermet).

Parameter Comparison

Engineering Selection Recommendations

Bourns 3852C-162-503AL as Primary Substitute:

The Bourns 3852C-162-503AL is the qualified substitute for the obsolete Honeywell 381L50K based on the following engineering criteria:

1. Electrical Equivalence: Identical resistance value (50k Ohm), tolerance (±10%), taper (Linear), and termination style (Solder Lug) ensure direct functional replacement in circuit applications.

2. Mechanical Compatibility: Matching bushing thread (1/4-32), actuator type (Slotted), and actuator diameter (0.125") confirm panel mount installation compatibility.

3. Enhanced Specifications: The 2W power rating provides 100% margin above the original 1W requirement, improving thermal performance and component reliability in the application.

4. Active Product Status: The Bourns component is actively manufactured and supported, eliminating supply chain risk associated with the obsolete Honeywell part.

5. Regulatory Compliance: Both components meet RoHS requirements. The Bourns part carries ROHS3 compliance and REACH affected status, meeting current environmental regulations.

Design Considerations:

• Panel cutout diameter must accommodate the larger body size (0.750" vs. 0.625"). Verify mechanical fit before implementation.
• Rotation angle difference (280° vs. 300°) represents a 6.7% reduction. Confirm application does not require full 300° travel range.
• Cermet resistive material in the substitute provides superior temperature stability (±150ppm/°C specification) compared to conductive plastic.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 3852C-162-503AL directly replace the Honeywell 381L50K without circuit modifications?

A: Yes, for electrical circuit function. The 50k Ohm resistance, ±10% tolerance, linear taper, and solder lug termination are identical. However, mechanical panel integration requires verification of the larger body diameter (0.750" vs. 0.625") against the existing panel cutout.

Q: What is the significance of the 2W power rating on the Bourns substitute versus the 1W original?

A: The higher power rating indicates greater thermal dissipation capability. This provides operational margin and extends component life when operating at or near maximum power levels. The substitute is suitable for all applications where the original 1W part was specified.

Q: Does the 280° rotation on the Bourns part versus 300° on the Honeywell part affect functionality?

A: The 20-degree difference represents a 6.7% reduction in total rotation range. For applications requiring the full 300-degree adjustment span, this difference must be evaluated against actual control requirements. For most standard potentiometer applications, 280-degree rotation is sufficient.

Q: Are there packaging differences between these components?

A: Yes. The Honeywell 381L50K is listed as obsolete with no current packaging specification. The Bourns 3852C-162-503AL is supplied in Tray packaging as an active product. Verify tray quantity and handling requirements for your procurement process.

Q: What is the difference between Conductive Plastic and Cermet resistive materials?

A: Both materials are suitable for linear potentiometer applications. Cermet (ceramic-metal composite) typically offers superior temperature stability and longer operational life. The Bourns substitute's Cermet material with ±150ppm/°C temperature coefficient provides better performance across temperature ranges compared to the unspecified conductive plastic material of the original.

Q: Are both components RoHS compliant?

A: Yes. The Honeywell 381L50K is RoHS Compliant. The Bourns 3852C-162-503AL is ROHS3 Compliant, representing the current RoHS standard. Both meet environmental compliance requirements for current manufacturing and distribution.

Q: What should I verify before implementing the Bourns substitute in production?

A: Verify panel cutout diameter compatibility with the 0.750" body size, confirm 280-degree rotation range meets application requirements, and validate that the Cermet material performance is acceptable for your temperature operating range. Electrical performance is directly equivalent.