308NPC1K Panel Mount Potentiometer - Equivalent & Substitute Parts

Part Overview

The Honeywell 308NPC1K is a 1k Ohm, 1/2W linear panel mount potentiometer featuring conductive plastic resistive material, PC pin termination, and slotted actuator adjustment. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing procurement and design applications. The 308NPC series represents a legacy product line, making substitute identification critical for system maintenance and new design implementations.

Substiute Parts

308NPC1K

Honeywell Sensing and Productivity SolutionsIn Stock: 982308NPC1K Datasheet

Current PartRFQ

51CAD-E24-A10L

Bourns Inc.In Stock: 118751CAD-E24-A10L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 308NPC1K is based on strict alignment of critical electrical and mechanical parameters. The following parameters must match or exceed the original specification:

Critical Matching Parameters:

• Resistance value: 1k Ohm (exact match required)
• Taper configuration: Linear (functional equivalence)
• Termination: PC Pins (PCB interface compatibility)
• Mounting: Panel Mount with 1/4-32 bushing thread (mechanical fit)
• Number of gangs: Single gang (1)
• Tolerance: ±10% or better

Acceptable Variations:

• Power rating: Substitute may exceed 0.5W (1W acceptable)
• Resistive material: Cermet acceptable as functional equivalent to conductive plastic
• Rotation angle: Minor variations (290° to 295°) acceptable within operational context
• Body dimensions: Minor dimensional variations acceptable if mounting interface remains compatible

The Bourns 51CAD-E24-A10L qualifies as a direct substitute based on these criteria, with the primary advantage of active product status and enhanced power rating (1W vs. 0.5W).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Bourns 51CAD-E24-A10L

The 51CAD-E24-A10L is the recommended substitute for the obsolete 308NPC1K based on the following engineering factors:

Product Status Advantage: The 51CAD-E24-A10L maintains active production status, ensuring long-term availability and supply chain continuity. The 308NPC1K obsolete status creates procurement risk for ongoing applications.

Compliance and Certification: Both components meet RoHS requirements. The 51CAD-E24-A10L carries ROHS3 compliance and REACH affected status, meeting current regulatory standards. The substitute is suitable for applications requiring modern environmental compliance documentation.

Electrical Performance: The 1W power rating of the 51CAD-E24-A10L exceeds the 0.5W requirement of the original part, providing operational margin. Resistance value, tolerance, and taper configuration are identical. The Cermet resistive material provides equivalent functional performance to the conductive plastic material in the original design.

Mechanical Compatibility: All critical mechanical parameters align: identical bushing thread (1/4-32), mounting type (panel mount), actuator configuration (slotted, 0.750" length, 0.125" diameter), and termination style (PC pins). The 5° rotation angle difference (290° vs. 295°) is operationally insignificant for linear potentiometer applications.

Packaging Consideration: The 51CAD-E24-A10L is supplied in tray packaging, suitable for automated assembly and bulk procurement workflows.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 51CAD-E24-A10L directly replace the Honeywell 308NPC1K in existing designs?

A: Yes. The substitute meets all critical electrical and mechanical parameters. Identical resistance (1k Ohm), taper (linear), termination (PC pins), mounting interface (1/4-32 panel mount), and actuator configuration ensure direct compatibility. The higher power rating (1W vs. 0.5W) provides additional operational margin without affecting circuit function.

Q: What is the significance of the resistive material difference (Conductive Plastic vs. Cermet)?

A: Both materials are standard for potentiometer applications and provide equivalent functional performance in linear taper configurations. Cermet material in the substitute offers enhanced durability and temperature stability (±150ppm/°C specified). This represents an improvement over the original design.

Q: Are there any compliance or certification differences between the two parts?

A: Both components are RoHS compliant. The 51CAD-E24-A10L carries ROHS3 compliance, representing current regulatory standards. The substitute also carries REACH affected status, meeting modern environmental documentation requirements. No compliance barriers exist for substitution.

Q: Does the 5° rotation angle difference (290° vs. 295°) affect circuit performance?

A: No. For linear potentiometer applications, this minor variation in total rotation angle is operationally insignificant. Both parts provide equivalent functional range for standard control applications.

Q: What is the inventory status for the substitute part?

A: The Bourns 51CAD-E24-A10L is in active production with 1,130 pieces available in current inventory, ensuring reliable procurement for both immediate and ongoing requirements.

Q: Are there any packaging or handling differences?

A: The 51CAD-E24-A10L is supplied in tray packaging, suitable for automated assembly processes. The original 308NPC1K packaging specification was not detailed in available documentation. Tray packaging is standard for modern potentiometer procurement and integrates with contemporary manufacturing workflows.