308NPC250 Equivalent & Substitute Parts

Part Overview

The 308NPC250 is a 250 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 currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing applications and new designs requiring this resistance value and power rating.

Substiute Parts

308NPC250

Honeywell Sensing and Productivity SolutionsIn Stock: 1147308NPC250 Datasheet

Current PartRFQ

93R1A-R22-A07L

Bourns Inc.In Stock: 90593R1A-R22-A07L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 308NPC250 is determined by the following critical parameters:

Electrical Compatibility:

• Resistance value: 250 Ohms (exact match required)
• Tolerance: ±10% (matching tolerance ensures circuit performance)
• Taper: Linear (functional characteristic for application behavior)
• Number of turns: 1.0 (single-turn operation)
• Number of gangs: 1 (single potentiometer element)

Mechanical Compatibility:

• Mounting type: Panel Mount (installation method)
• Termination style: PC Pins (circuit board connection)
• Adjustment type: Side Adjustment (operational interface)
• Built-in switch: None (no switching function required)

Environmental & Regulatory:

• RoHS compliance status (regulatory requirement)
• Moisture Sensitivity Level (MSL): 1 (storage and handling)

The 93R1A-R22-A07L from Bourns Inc. qualifies as a substitute based on matching all critical electrical parameters (250 Ohms, ±10% tolerance, linear taper, 1 gang, 1 turn) and mechanical requirements (panel mount, PC pins, side adjustment). The substitute maintains functional equivalence despite differences in power rating (2W versus 0.5W), resistive material (Cermet versus Conductive Plastic), and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 93R1A-R22-A07L (Bourns Inc.)

The 93R1A-R22-A07L is the qualified substitute for the obsolete 308NPC250. Selection rationale is based on the following factors:

Electrical Equivalence: Both components provide 250 Ohm resistance with ±10% tolerance and linear taper characteristics. Single-turn, single-gang configuration ensures identical functional behavior in circuit applications.

Mechanical Compatibility: Both components feature panel mount installation with PC pin termination and side adjustment operation. This ensures direct replacement capability in existing mechanical assemblies and printed circuit board layouts.

Product Status: The 93R1A-R22-A07L maintains active production status with 800 units in current inventory, ensuring long-term availability and supply chain continuity for the obsolete 308NPC250.

Regulatory Compliance: The 93R1A-R22-A07L is ROHS3 Compliant and REACH Affected, meeting current environmental and regulatory requirements. The original 308NPC250 is RoHS Compliant, confirming compatibility with RoHS-regulated applications.

Power Rating Consideration: The substitute component is rated at 2W compared to the original 0.5W rating. This higher power rating provides additional thermal margin and does not create incompatibility in applications designed for the lower-rated original component.

Frequently Asked Questions (FAQ)

Q: Can the 93R1A-R22-A07L directly replace the 308NPC250 in existing designs?

A: Yes. Both components share identical resistance (250 Ohms), tolerance (±10%), taper (linear), number of turns (1.0), number of gangs (1), mounting type (panel mount), termination style (PC pins), and adjustment type (side adjustment). These parameters determine functional equivalence for circuit operation and mechanical installation.

Q: What is the significance of the different power ratings (0.5W versus 2W)?

A: The 93R1A-R22-A07L has a higher power rating (2W) than the original 308NPC250 (0.5W). In substitution applications, a higher power rating is acceptable and provides additional thermal capacity. The substitute will not create thermal or electrical incompatibility in circuits designed for the lower-rated original component.

Q: Are there differences in resistive material between these components?

A: Yes. The 308NPC250 uses conductive plastic resistive material, while the 93R1A-R22-A07L uses Cermet material. Both materials are standard for potentiometer construction and provide linear taper characteristics. The material difference does not affect functional equivalence for standard potentiometer applications.

Q: What is the difference in rotation angle between the two components?

A: The 308NPC250 provides 295° rotation, while the 93R1A-R22-A07L provides 300° rotation. This 5° difference is negligible for single-turn potentiometer applications and does not affect functional compatibility.

Q: Are there physical dimension differences that affect installation?

A: Yes. The 308NPC250 has a square body (0.500" x 0.500" face), while the 93R1A-R22-A07L has a rectangular body (0.687" x 0.625" face). Additionally, the bushing thread differs (1/4-32 versus M10 x 0.75). Panel mount installation compatibility must be verified based on specific mechanical assembly requirements and available panel cutout dimensions.

Q: What is the inventory status for each component?

A: The 308NPC250 has 1,078 units in current stock but is marked as obsolete. The 93R1A-R22-A07L has 800 units in current inventory and maintains active product status, ensuring continued availability for future procurement.

Q: Are both components RoHS compliant?

A: Yes. The 308NPC250 is RoHS Compliant. The 93R1A-R22-A07L is ROHS3 Compliant, which represents the current RoHS standard. Both components meet RoHS regulatory requirements for restricted substance content.