Honeywell 381L500 Potentiometer: Equivalent & Substitute Parts

Part Overview

The Honeywell 381L500 is a 500 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 ongoing applications and new designs. The 381L500 series represents a legacy product line, making equivalent part sourcing essential for system continuity and procurement planning.

Key Parameters

Parameter	Value
Resistance	500 Ohms
Power Rating	1W
Taper	Linear
Number of Gangs	1
Number of Turns	1
Tolerance	±10%
Rotation	300°
Mounting Type	Panel Mount
Termination Style	Solder Lug
Bushing Thread	1/4-32
Actuator Type	Slotted
RoHS Status	RoHS Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the Honeywell 381L500 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 500 Ohms
Tolerance: ±10%
Taper: Linear
Number of Gangs: 1
Number of Turns: 1
Rotation: 300°
Mounting Type: Panel Mount
Termination Style: Solder Lug
Bushing Thread: 1/4-32
Actuator Type: Slotted
Actuator Diameter: 0.125" (3.18mm)
RoHS Compliance: Required

Allowable Variation:

Power Rating: Substitute parts may exceed the 1W specification, provided all other parameters remain equivalent
Resistive Material: Conductive plastic or wirewound materials are both acceptable for this application category
Actuator Length: Minor variations permitted within mechanical compatibility constraints
Product Status: Active status preferred for long-term availability

The Ohmite RES500E meets all mandatory matching parameters and qualifies as a direct substitute.

Parameter Comparison

Parameter	Honeywell 381L500	Ohmite RES500E	Match Status
Resistance (Ohms)	500	500	Equivalent
Tolerance	±10%	±10%	Equivalent
Power (Watts)	1W	12.5W	Substitute Exceeds Rating
Taper	Linear	Linear	Equivalent
Number of Gangs	1	1	Equivalent
Number of Turns	1	1	Equivalent
Rotation	300°	300°	Equivalent
Resistive Material	Conductive Plastic	Wirewound	Different Material, Same Category
Termination Style	Solder Lug	Solder Lug	Equivalent
Actuator Type	Slotted	Slotted	Equivalent
Actuator Diameter	0.125" (3.18mm)	0.125" (3.18mm)	Equivalent
Bushing Thread	1/4-32	1/4-32	Equivalent
Mounting Type	Panel Mount	Panel Mount	Equivalent
RoHS Status	RoHS Compliant	RoHS Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The Ohmite RES500E qualifies as a direct substitute for the Honeywell 381L500 based on the following engineering criteria:

Compliance and Certification: Both parts maintain RoHS compliance and carry identical ECCN classification (EAR99), ensuring regulatory equivalence for procurement and export purposes.

Product Status Advantage: The RES500E holds active product status, providing superior long-term availability and supply chain stability compared to the obsolete 381L500. This status supports ongoing production requirements and future component sourcing.

Electrical and Mechanical Compatibility: All critical functional parameters align between the two parts: 500 Ohm resistance, ±10% tolerance, linear taper, 1 gang, 1 turn, 300° rotation, and identical mechanical interfaces (1/4-32 bushing thread, slotted actuator, 0.125" diameter).

Power Rating Consideration: The RES500E provides 12.5W power handling capacity, exceeding the 381L500 specification of 1W. This enhanced rating does not compromise compatibility and provides additional thermal margin for the application.

Material Difference: The RES500E employs wirewound resistive material in place of the 381L500's conductive plastic construction. Both materials are acceptable within the potentiometer category for this resistance and power specification range.

Frequently Asked Questions (FAQ)

Q: Can the Ohmite RES500E directly replace the Honeywell 381L500 in existing designs?

A: Yes. The RES500E matches all mandatory electrical and mechanical parameters: 500 Ohm resistance, ±10% tolerance, linear taper, 1 gang, 1 turn, 300° rotation, 1/4-32 panel mount bushing, and solder lug termination. Physical mounting and electrical connection are identical.

Q: What is the significance of the higher power rating on the RES500E?

A: The RES500E's 12.5W rating exceeds the 381L500's 1W specification. This difference does not affect substitution compatibility. The higher rating indicates greater thermal capacity and is acceptable for applications originally designed for 1W operation.

Q: Are there material compatibility concerns between conductive plastic and wirewound designs?

A: No. Both conductive plastic and wirewound materials are standard resistive technologies for potentiometers in this category. The RES500E's wirewound construction is functionally equivalent for the specified 500 Ohm, 1 gang, linear taper application.

Q: Does the RES500E maintain the same mechanical footprint?

A: Yes. Both parts share identical mechanical specifications: 1/4-32 bushing thread, 0.125" (3.18mm) actuator diameter, slotted actuator type, and panel mount configuration. Physical installation is identical.

Q: What is the inventory status for these parts?

A: The Honeywell 381L500 shows 826 pieces in stock with obsolete status. The Ohmite RES500E shows 1,139 pieces in stock with active product status, providing superior availability for new orders and ongoing supply.

Q: Are both parts RoHS compliant?

A: Yes. Both the Honeywell 381L500 and Ohmite RES500E carry RoHS compliance certification, meeting environmental and regulatory requirements for electronic component procurement.

Q: What packaging is available for the RES500E?

A: The Ohmite RES500E is supplied in bulk packaging, suitable for production assembly and component integration workflows.

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