Honeywell 381N25K Potentiometer - Equivalent & Substitute Parts

Part Overview

The Honeywell 381N25K is a 25k Ohm 1 Watt linear panel mount potentiometer featuring conductive plastic resistive material and solder lug termination. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing procurement and system maintenance. The 381 series potentiometer is designed for user-defined adjustment applications requiring 1 Watt power dissipation capability and linear taper response across a 300° rotation range.

Substiute Parts

381N25K

Honeywell Sensing and Productivity SolutionsIn Stock: 873381N25K Datasheet

Current PartRFQ

CLU2531E

OhmiteIn Stock: 1033CLU2531E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete Honeywell 381N25K is based on strict electrical and mechanical parameter alignment. The primary substitute, Ohmite CLU2531E, maintains compatibility through the following critical parameters:

Electrical Compatibility:

• Identical resistance value: 25k Ohm
• Matching tolerance: ±10%
• Identical taper configuration: Linear
• Matching termination: Solder Lug
• Single gang, single turn configuration

Mechanical Compatibility:

• Identical bushing thread specification: 1/4-32
• Matching actuator type: Slotted
• Identical actuator diameter: 0.125" (3.18mm)
• Panel mount configuration maintained
• Round body form factor

Regulatory Compliance:

• Both components maintain RoHS compliance status
• Identical ECCN and HTSUS classifications

The CLU2531E substitute operates at 2W power rating, which exceeds the 1W requirement of the original 381N25K, providing enhanced thermal margin in applications. Rotation range variation (312° versus 300°) and resistive material difference (Carbon versus Conductive Plastic) fall within acceptable substitution parameters for linear potentiometer applications.

Parameter Comparison

Engineering Selection Recommendations

The Ohmite CLU2531E is the designated substitute for the obsolete Honeywell 381N25K based on the following engineering criteria:

Product Status Alignment: The CLU2531E maintains active production status, ensuring long-term availability and supply chain continuity. The 381N25K obsolete status necessitates transition to an active equivalent for new designs and ongoing maintenance applications.

Compliance Certification: Both components satisfy RoHS compliance requirements. The CLU2531E carries ROHS3 certification, representing current regulatory standards. Identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications confirm regulatory equivalence for export and tariff purposes.

Electrical Parameter Equivalence: Matching 25k Ohm resistance, ±10% tolerance, linear taper, and single-gang configuration ensure functional equivalence in circuit applications. The 2W power rating of the CLU2531E provides operational margin above the 1W specification of the original component.

Mechanical Interface Compatibility: Identical 1/4-32 bushing thread, slotted actuator type, and 0.125" actuator diameter confirm direct mechanical substitution in panel mount applications. Body diameter variation (15.88mm versus 29.40mm) reflects different physical form factors but does not affect functional compatibility in standard panel cutout installations.

Termination Compatibility: Both components utilize solder lug termination, maintaining circuit connection methodology without modification to existing PCB or wiring designs.

Frequently Asked Questions (FAQ)

Q: Can the Ohmite CLU2531E directly replace the Honeywell 381N25K in existing applications?

A: Yes. The CLU2531E maintains electrical equivalence through identical resistance, tolerance, taper, and termination specifications. Mechanical compatibility is confirmed through matching bushing thread (1/4-32) and actuator specifications. The higher power rating (2W versus 1W) provides enhanced thermal capability without affecting circuit operation.

Q: What is the significance of the different power ratings (1W versus 2W)?

A: The CLU2531E 2W rating exceeds the 381N25K 1W specification, providing additional thermal dissipation capacity. This represents an enhancement rather than a limitation, allowing the substitute to operate safely in applications designed for the lower-rated original component.

Q: How do the different resistive materials (Conductive Plastic versus Carbon) affect substitution?

A: Both conductive plastic and carbon materials are standard resistive elements in linear potentiometer design. Material selection does not affect electrical parameter equivalence (resistance, tolerance, taper) or mechanical compatibility. The substitution remains valid for standard linear adjustment applications.

Q: Are there packaging differences between these components?

A: The Honeywell 381N25K is specified with standard packaging, while the Ohmite CLU2531E is supplied in bulk packaging. This distinction affects procurement and inventory management but does not impact component functionality or electrical performance.

Q: What is the practical significance of the 12° rotation range difference (300° versus 312°)?

A: The rotation range difference (300° versus 312°) represents a 4% variation. For linear potentiometer applications, this minor difference does not affect functional compatibility or adjustment resolution in standard user-defined adjustment circuits.

Q: Are both components RoHS compliant?

A: Yes. The Honeywell 381N25K carries RoHS Compliant certification, while the Ohmite CLU2531E carries ROHS3 Compliant certification. Both satisfy current RoHS regulatory requirements for electronic component manufacturing and use.

Q: What are the export and tariff implications of this substitution?

A: Both components share identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications, confirming equivalent export control and tariff treatment. No regulatory documentation changes are required for substitution.