Honeywell 308N1K Potentiometer: Equivalent & Substitute Parts

Part Overview

The Honeywell Sensing and Productivity Solutions 308N1K is a 1k Ohm, 1/2W linear panel mount potentiometer featuring conductive plastic resistive material and a 295° rotation angle. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations. The 308N1K serves applications requiring precise manual voltage adjustment in compact panel-mounted configurations with moderate power dissipation requirements.

Substiute Parts

308N1K

Honeywell Sensing and Productivity SolutionsIn Stock: 725308N1K Datasheet

Current PartRFQ

P261P-S1AS3CB1K

TT Electronics/BIIn Stock: 741P261P-S1AS3CB1K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete Honeywell 308N1K is permissible with the TT Electronics/BI P261P-S1AS3CB1K based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Resistance value: 1k Ohm (identical)
• Power rating: 0.5W / 1/2W (identical)
• Taper characteristic: Linear (identical)
• Number of turns: 1.0 (identical)
• Rotation angle: 295° (identical)
• Resistive material: Conductive Plastic (identical)
• Mounting configuration: Panel Mount (identical)
• Bushing thread: 1/4-32 (identical)
• Body size: Square 0.500" x 0.500" face (identical)
• Tolerance: ±10% (identical)

Acceptable Variations:

• Termination style: 308N1K uses Solder Hook; P261P-S1AS3CB1K uses Solder Lug. Both are standard termination methods compatible with circuit board assembly processes.
• Actuator length: 308N1K measures 0.750" (19.05mm); P261P-S1AS3CB1K measures 0.787" (20.00mm). This 0.037" difference is within typical mechanical tolerance for panel-mounted potentiometer applications.
• Actuator diameter: 308N1K is 0.125" (3.18mm); P261P-S1AS3CB1K is 0.126" (3.20mm). This 0.001" difference is negligible for mechanical fit.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI P261P-S1AS3CB1K qualifies as a direct functional substitute for the obsolete Honeywell 308N1K based on complete alignment of all critical electrical specifications and mechanical mounting parameters.

Product Status Consideration: The P261P-S1AS3CB1K maintains active product status, ensuring continued availability and supply chain reliability compared to the obsolete 308N1K.

Compliance Status: Both components satisfy RoHS requirements. The P261P-S1AS3CB1K carries ROHS3 compliance certification, representing current regulatory standards. The 308N1K is RoHS Compliant. Both components are classified under identical ECCN (EAR99) and HTSUS (8533.40.8070) codes, confirming equivalent regulatory treatment.

Termination Compatibility: The transition from Solder Hook (308N1K) to Solder Lug (P261P-S1AS3CB1K) requires verification of circuit board pad design. Both termination styles are standard in potentiometer applications and accommodate conventional soldering processes. Circuit board layout modification may be necessary if the original design specifically requires hook-style termination geometry.

Mechanical Fit Verification: The minor variations in actuator length (0.037" difference) and diameter (0.001" difference) fall within acceptable mechanical tolerances for panel-mounted potentiometer installations. Panel cutout dimensions and actuator clearance should be confirmed against the specific application enclosure design.

Frequently Asked Questions (FAQ)

Q: Can the P261P-S1AS3CB1K directly replace the 308N1K without circuit modification?

A: Electrical substitution is direct. The identical resistance value, power rating, taper, and tolerance ensure circuit performance equivalence. Mechanical installation requires verification of panel cutout compatibility and termination pad design. The Solder Lug termination of the P261P-S1AS3CB1K may require circuit board layout adjustment if the original design accommodates only Solder Hook termination.

Q: What is the significance of the actuator length difference between these parts?

A: The 308N1K actuator measures 0.750" (19.05mm) while the P261P-S1AS3CB1K measures 0.787" (20.00mm), a difference of 0.037". This variation is within standard mechanical tolerance for panel-mounted potentiometers. Verify that the application enclosure provides sufficient depth to accommodate the slightly longer actuator without interference.

Q: Are both components RoHS compliant?

A: Yes. The 308N1K is RoHS Compliant. The P261P-S1AS3CB1K carries ROHS3 Compliant certification, representing alignment with current regulatory standards. Both components satisfy RoHS requirements for new designs and legacy system maintenance.

Q: What packaging differences exist between these parts?

A: The 308N1K is supplied in standard packaging (not specified). The P261P-S1AS3CB1K is supplied in Tray packaging. Verify that tray packaging accommodates your receiving, storage, and assembly processes.

Q: Why is the 308N1K classified as obsolete?

A: Obsolescence reflects manufacturer discontinuation of the product line. The P261P-S1AS3CB1K, maintained in active product status by TT Electronics/BI, provides equivalent functionality with assured long-term availability.

Q: Are there any differences in sealed or environmental protection between these potentiometers?

A: The P261P-S1AS3CB1K includes sealed construction as a specified feature. The 308N1K does not list sealed construction in its specifications. If environmental sealing is required for the application, the P261P-S1AS3CB1K provides this additional protection.

Q: What is the inventory status for these components?

A: The 308N1K has 620 pieces in stock (new original). The P261P-S1AS3CB1K has 656 pieces in stock (new original). Both components are currently available for procurement.