308NPC500 Equivalent & Substitute Parts

Part Overview

The 308NPC500 is a 500 Ohm, 1/2W linear panel mount potentiometer manufactured by Honeywell Sensing and Productivity Solutions. This component features conductive plastic resistive material, PC pin termination, and a 295° rotation angle in a compact square body format (0.500" x 0.500" face). The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where this component specification is required.

Substiute Parts

308NPC500

Honeywell Sensing and Productivity SolutionsIn Stock: 808308NPC500 Datasheet

Current PartRFQ

93R1A-R22-A08L

Bourns Inc.In Stock: 115893R1A-R22-A08L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 308NPC500 is determined by the following critical parameters:

Core Electrical Compatibility:

• Resistance value: 500 Ohm (exact match required)
• Tolerance: ±10% (matching specification)
• Taper characteristic: Linear (functional requirement)
• Number of gangs: 1 (circuit configuration requirement)
• Number of turns: 1.0 (adjustment range requirement)

Mechanical & Interface Compatibility:

• Termination style: PC Pins (circuit board connection requirement)
• Mounting type: Panel Mount (installation method requirement)
• Adjustment type: Side Adjustment (operational interface requirement)
• Built-in switch: None (functional requirement)

Performance Considerations:

• Power rating: Substitute parts must meet or exceed 0.5W minimum requirement
• Resistive material: Conductive Plastic or Cermet materials are functionally equivalent for this application class

The 93R1A-R22-A08L qualifies as a substitute based on matching all core electrical parameters, mechanical interface requirements, and exceeding the power rating specification (2W vs. 0.5W).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 93R1A-R22-A08L (Bourns Inc.)

The 93R1A-R22-A08L is the qualified substitute for the obsolete 308NPC500. Selection rationale:

1. Electrical Equivalence: Identical 500 Ohm resistance, ±10% tolerance, and linear taper ensure direct functional replacement in circuit applications.

2. Power Rating Enhancement: The 2W power rating of the substitute exceeds the 0.5W requirement of the original component, providing improved thermal margin and reliability in the application.

3. Mechanical Compatibility: Matching PC pin termination, panel mount configuration, and side adjustment interface enable direct installation without circuit board redesign.

4. Product Status: The substitute is actively manufactured and stocked (1079 pcs available), ensuring long-term supply availability compared to the obsolete original.

5. Regulatory Compliance: Both components meet RoHS requirements. The substitute carries ROHS3 compliance and REACH affected status, meeting current environmental regulations.

6. Material Consideration: The Cermet resistive material in the substitute provides equivalent performance characteristics to the conductive plastic material in the original for this application class.

Physical Mounting Consideration: The substitute body dimensions differ slightly (Rectangular 0.687" x 0.625" vs. Square 0.500" x 0.500"), and the bushing thread specification changes (M10 x 0.75 vs. 1/4-32). Panel cutout and mounting hardware verification is required during implementation.

Frequently Asked Questions (FAQ)

Q: Can the 93R1A-R22-A08L directly replace the 308NPC500 in all applications?

A: The 93R1A-R22-A08L provides electrical and functional equivalence for all circuit-level requirements. However, physical mounting verification is necessary due to differences in body dimensions and bushing thread specifications. Panel cutout modifications may be required.

Q: What is the significance of the power rating difference (0.5W vs. 2W)?

A: The substitute's higher power rating (2W) exceeds the original specification (0.5W), providing enhanced thermal performance and operational margin. This represents an improvement in component capability and does not create compatibility issues.

Q: Are there differences in resistive material performance between conductive plastic and Cermet?

A: Both conductive plastic and Cermet materials are established resistive technologies for potentiometer applications. The Cermet material in the substitute provides equivalent performance for this 500 Ohm, linear taper application. The substitute includes a temperature coefficient specification (±150ppm/°C) not provided for the original component.

Q: What is the impact of the rotation angle difference (295° vs. 300°)?

A: The substitute provides a 300° rotation angle compared to the original 295°. This represents a 5° increase in adjustment range, which does not create compatibility issues and may provide improved resolution in applications requiring full-range adjustment.

Q: How do the bushing thread specifications affect substitution?

A: The original uses 1/4-32 bushing thread while the substitute uses M10 x 0.75 metric thread. These specifications determine panel mounting hardware and cutout dimensions. Mechanical integration requires verification that the panel assembly accommodates the metric thread specification.

Q: Is the 93R1A-R22-A08L suitable for new designs or only for replacement applications?

A: The 93R1A-R22-A08L is actively manufactured and fully compliant with current regulatory standards (ROHS3, REACH). It is suitable for both replacement of obsolete 308NPC500 components and for new design implementations requiring 500 Ohm linear potentiometer specifications.

Q: What inventory status should be considered for component selection?

A: The 93R1A-R22-A08L has 1079 pcs in stock with active product status, ensuring reliable supply availability. The original 308NPC500 is obsolete with limited remaining inventory (717 pcs), making transition to the substitute necessary for long-term system support.