Honeywell 392C3250 Potentiometer Equivalent & Substitute Parts

Part Overview

The Honeywell 392C3250 is a 250 Ohm, 1/2W linear panel mount potentiometer with conductive plastic resistive material and PC pin termination. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance and new design implementations. The part features a 1-gang configuration with 295° rotation and slotted actuator design suitable for panel-mounted applications.

Key Parameters

Parameter	Value	Substitution Relevance
Resistance	250 Ohms	Critical - must match exactly
Power Rating	0.5W, 1/2W	Critical - must match or exceed
Taper	Linear	Critical - determines response curve
Number of Gangs	1	Critical - circuit configuration
Number of Turns	1.0	Critical - rotation range
Rotation	295°	Critical - mechanical travel
Termination Style	PC Pins	Critical - electrical connection
Mounting Type	Panel Mount	Critical - form factor
Bushing Thread	1/4-32	Critical - mechanical interface
Actuator Type	Slotted	Important - adjustment interface
Actuator Length	0.875" (22.23mm)	Important - physical clearance
Actuator Diameter	0.125" (3.18mm)	Important - tool compatibility
Body Diameter	0.510" (12.95mm)	Important - panel cutout
Tolerance	±10%	Important - accuracy specification

Substitute Part Grouping Explanation

Substitution of the Honeywell 392C3250 is determined by strict equivalence across electrical and mechanical parameters. The following criteria establish valid substitution:

Electrical Parameters (Non-negotiable):

Resistance value: 250 Ohms
Power rating: 0.5W or 1/2W minimum
Taper: Linear response
Number of gangs: 1
Number of turns: 1.0
Rotation angle: 295°
Tolerance: ±10%

Mechanical Parameters (Non-negotiable):

Termination: PC Pins
Mounting: Panel Mount
Bushing thread: 1/4-32
Actuator type: Slotted
Actuator length: 0.875" (22.23mm)
Actuator diameter: 0.125" (3.18mm)
Body diameter: 0.510" (12.95mm)

Resistive Material: The 392C3250 uses conductive plastic. Substitutes may employ alternative resistive materials (such as carbon) provided all other parameters remain equivalent and the substitute part maintains the same electrical performance characteristics.

Parameter Comparison

Parameter	Honeywell 392C3250	Precision Electronics SPRU2511S28	Match Status
Resistance (Ohms)	250	250	Match
Power (Watts)	0.5W, 1/2W	0.5W, 1/2W	Match
Tolerance	±10%	±10%	Match
Taper	Linear	Linear	Match
Number of Gangs	1	1	Match
Number of Turns	1.0	1.0	Match
Rotation	295°	295°	Match
Termination Style	PC Pins	PC Pins	Match
Actuator Type	Slotted	Slotted	Match
Actuator Length	0.875" (22.23mm)	0.875" (22.23mm)	Match
Actuator Diameter	0.125" (3.18mm)	0.125" (3.18mm)	Match
Bushing Thread	1/4-32	1/4-32	Match
Mounting Type	Panel Mount	Panel Mount	Match
Body Diameter	0.510" (12.95mm)	0.510" (12.95mm)	Match
Resistive Material	Conductive Plastic	Carbon	Different - functionally equivalent
Adjustment Type	User Defined	Top Adjustment	Different - operational difference
Product Status	Obsolete	Active	Substitute is current production
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant

Engineering Selection Recommendations

The Precision Electronics SPRU2511S28 is a direct functional equivalent to the Honeywell 392C3250 for applications requiring a 250 Ohm, 1/2W linear potentiometer with panel mount configuration.

Compliance Status:

The 392C3250 is RoHS Compliant
The SPRU2511S28 is ROHS3 Compliant, representing current regulatory compliance
Both parts carry ECCN EAR99 classification
Both parts share identical HTSUS code 8533.40.8070

Material Difference: The primary technical difference is resistive material composition. The 392C3250 employs conductive plastic, while the SPRU2511S28 uses carbon. Both materials deliver equivalent electrical performance at the specified 250 Ohm resistance and 1/2W power rating with ±10% tolerance. This substitution is valid for standard potentiometer applications where resistive material type is not a specific design constraint.

Adjustment Mechanism: The 392C3250 specifies "User Defined" adjustment type, while the SPRU2511S28 specifies "Top Adjustment." Both employ identical slotted actuator geometry (0.875" length, 0.125" diameter), ensuring mechanical compatibility with existing adjustment tools and panel interfaces.

Product Status: The SPRU2511S28 is classified as Active production status, providing supply chain continuity for the obsolete 392C3250. Current inventory availability is 796 pieces for the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the SPRU2511S28 directly replace the 392C3250 in existing designs?

A: Yes. All critical electrical parameters (250 Ohm resistance, 1/2W power rating, linear taper, 295° rotation) and mechanical parameters (panel mount, 1/4-32 bushing thread, PC pin termination, slotted actuator geometry) are identical. The substitute part is mechanically and electrically interchangeable.

Q: What is the significance of the resistive material difference (conductive plastic vs. carbon)?

A: Both materials provide equivalent performance at the specified 250 Ohm resistance and 1/2W power rating. The material difference does not affect electrical function for standard potentiometer applications. Selection between materials is determined by application-specific requirements not specified in the base parameters.

Q: Does the adjustment type difference affect compatibility?

A: No. Both parts employ identical slotted actuator specifications (0.875" length, 0.125" diameter). The adjustment type designation reflects operational methodology but does not impact mechanical interface or tool compatibility.

Q: Are there packaging differences between these parts?

A: The 392C3250 is packaged as "-" (not specified), while the SPRU2511S28 is packaged as Bulk. Confirm packaging requirements for your procurement process.

Q: What is the compliance status for both parts?

A: The 392C3250 is RoHS Compliant. The SPRU2511S28 is ROHS3 Compliant, representing current regulatory standards. Both parts are classified as EAR99 for export control purposes.

Q: Is the SPRU2511S28 currently available?

A: Yes. The SPRU2511S28 is classified as Active production status with 796 pieces in current inventory, providing supply continuity for the obsolete 392C3250.

Q: What are the panel mounting specifications?

A: Both parts use identical panel mount configuration with 1/4-32 bushing thread and 0.510" (12.95mm) body diameter. Existing panel cutouts and mounting hardware are compatible.

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