Honeywell 381L100 Potentiometer - Equivalent & Substitute Parts

Part Overview

The Honeywell 381L100 is a 100 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 substitute parts for new designs and ongoing production requirements. The 381L100 series provides long-life operation with 300° rotation and 1/4-32 bushing thread mounting for standard panel applications.

Substiute Parts

381L100

Honeywell Sensing and Productivity SolutionsIn Stock: 1041381L100 Datasheet

Current PartRFQ

RES100E

OhmiteIn Stock: 1119RES100E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 381L100 is determined by the following core parameters:

Critical Matching Parameters:

• Resistance value: 100 Ohms
• Tolerance: ±10%
• Taper: Linear
• Number of gangs: 1
• Number of turns: 1
• Rotation: 300°
• Termination style: Solder Lug
• Mounting type: Panel Mount
• Bushing thread: 1/4-32
• Actuator type: Slotted
• Actuator diameter: 0.125" (3.18mm)

Flexible Parameters (allowing substitution):

• Power rating: Substitute may exceed 1W
• Resistive material: Conductive Plastic or Wirewound acceptable
• Body size: Minor dimensional variations permitted within panel mount constraints
• Actuator length: Functional variations acceptable
• Product status: Active preferred over obsolete

The Ohmite RES100E meets all critical matching parameters while providing enhanced power handling capability (12.5W versus 1W) and active product status.

Parameter Comparison

Engineering Selection Recommendations

Ohmite RES100E as Primary Substitute:

The Ohmite RES100E qualifies as a direct functional substitute for the obsolete Honeywell 381L100 based on matching electrical specifications and mechanical interface parameters. Both components share identical resistance value (100 Ohms), tolerance (±10%), linear taper, single-gang configuration, 300° rotation, solder lug termination, and 1/4-32 panel mount bushing thread.

Compliance Status:

• Honeywell 381L100: RoHS Compliant
• Ohmite RES100E: ROHS3 Compliant

Both components meet current regulatory requirements. The RES100E carries active product status, ensuring long-term availability and supply chain continuity compared to the obsolete 381L100.

Technical Considerations: The RES100E provides 12.5W power rating compared to the 381L100's 1W rating, representing a significant thermal capability increase. This enhanced power handling does not compromise functionality in applications requiring 1W operation. The resistive material differs (Wirewound versus Conductive Plastic), reflecting different manufacturing technologies while maintaining equivalent electrical performance at the specified resistance and tolerance values.

The RES100E body diameter (0.875" versus 0.625") requires verification of available panel cutout space. The identical actuator diameter (0.125") and bushing thread (1/4-32) ensure mechanical compatibility with existing panel mounting hardware.

Frequently Asked Questions (FAQ)

Q: Can the Ohmite RES100E directly replace the Honeywell 381L100 in existing designs?

A: The RES100E meets all critical electrical and mechanical interface specifications. Panel cutout diameter must accommodate the larger body size (0.875" versus 0.625"). Solder lug termination, bushing thread, and actuator specifications are identical, enabling direct substitution in compatible panel configurations.

Q: What is the significance of the different resistive materials (Conductive Plastic versus Wirewound)?

A: Both materials achieve the specified 100 Ohm resistance and ±10% tolerance. Conductive plastic technology (381L100) and wirewound technology (RES100E) represent different manufacturing approaches with equivalent electrical performance for this application. Material selection does not affect substitution eligibility when resistance, tolerance, and taper specifications match.

Q: Why does the RES100E have a higher power rating (12.5W versus 1W)?

A: The 12.5W rating reflects the wirewound construction's thermal dissipation capability. Applications requiring only 1W operation function normally with the RES100E; the higher rating provides additional thermal margin and does not introduce compatibility issues.

Q: Are there mechanical installation differences between these components?

A: Both components use identical 1/4-32 bushing threads and slotted actuators with 0.125" diameter. The primary mechanical difference is body diameter (0.875" for RES100E versus 0.625" for 381L100). Panel cutout dimensions must accommodate the larger substitute body.

Q: What compliance certifications apply to both components?

A: The 381L100 carries RoHS Compliance certification. The RES100E carries ROHS3 Compliance certification, representing current regulatory standards. Both components meet environmental and hazardous substance restrictions for electronic component applications.

Q: Is the RES100E available in active production?

A: Yes. The RES100E carries Active product status with 1040 pieces in current inventory, ensuring supply availability. The 381L100 is classified as Obsolete, making the RES100E the appropriate selection for new designs and ongoing production requirements.