308NPC100K Equivalent & Substitute Parts

Part Overview

The Honeywell 308NPC100K is a 100k Ohm, 1/2W linear panel mount potentiometer with conductive plastic resistive material and PC pin termination. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing applications and new designs. The 308NPC series is no longer in active production, making substitute parts essential for procurement and system continuity.

Substiute Parts

308NPC100K

Honeywell Sensing and Productivity SolutionsIn Stock: 1530308NPC100K Datasheet

Current PartRFQ

51CAD-E24-A20L

Bourns Inc.In Stock: 580551CAD-E24-A20L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 308NPC100K is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 100k Ohm
• Tolerance: ±10%
• Number of turns: 1
• Taper: Linear
• Number of gangs: 1
• Mounting type: Panel Mount
• Termination style: PC Pins
• Bushing thread: 1/4-32
• Actuator type: Slotted
• Adjustment type: Side Adjustment

Allowable Variations:

• Power rating: Substitute parts may have equal or higher power rating (minimum 0.5W)
• Resistive material: Conductive plastic or cermet materials are functionally equivalent for this application
• Body size: Minor dimensional variations within mechanical envelope constraints
• Rotation angle: Variations within ±10° are acceptable
• Regulatory compliance: Active product status with current certifications preferred

The Bourns 51CAD-E24-A20L meets all mandatory parameters and represents an active, compliant substitute.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 51CAD-E24-A20L is a direct functional substitute for the obsolete Honeywell 308NPC100K based on the following engineering criteria:

Electrical Equivalence: Both components provide 100k Ohm resistance with ±10% tolerance in a single-turn linear potentiometer configuration. The 51CAD-E24-A20L offers 1W power rating, which exceeds the 0.5W requirement of the 308NPC100K, providing additional thermal margin in applications.

Mechanical Compatibility: Both parts feature identical bushing threads (1/4-32), slotted actuators with 0.750" length and 0.125" diameter, side adjustment mechanism, and panel mount configuration. Body dimensions are within acceptable mechanical envelope tolerances for standard panel cutouts.

Regulatory Compliance: The 51CAD-E24-A20L holds active product status with ROHS3 compliance and REACH affected designation, meeting current regulatory requirements. The 308NPC100K is RoHS compliant but obsolete.

Material Consideration: The 51CAD-E24-A20L uses cermet resistive material with sealed construction and ±150ppm/°C temperature coefficient, compared to the conductive plastic material of the 308NPC100K. Cermet construction provides enhanced durability and environmental sealing suitable for demanding applications.

Selection of the 51CAD-E24-A20L is appropriate for direct replacement in existing designs and for new applications requiring 100k Ohm linear potentiometers with panel mount configuration.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 51CAD-E24-A20L directly replace the Honeywell 308NPC100K without circuit modification?

A: Yes. Both components are electrically and mechanically equivalent across all critical parameters: 100k Ohm resistance, ±10% tolerance, 1-turn linear taper, PC pin termination, and identical bushing thread specification. No circuit modifications are required.

Q: What is the significance of the higher power rating (1W vs. 0.5W) on the substitute part?

A: The higher power rating on the 51CAD-E24-A20L provides additional thermal dissipation capability. This is a beneficial characteristic that does not affect compatibility. Applications designed for 0.5W operation will function within the thermal envelope of the 1W-rated substitute.

Q: Are there mechanical mounting differences between these two potentiometers?

A: Both components use identical 1/4-32 bushing threads and panel mount configuration. Body dimensions differ slightly (square vs. rectangular face), but both fit standard panel cutouts designed for 1/4-32 threaded potentiometers. Verify panel cutout dimensions for your specific application.

Q: What is the difference between conductive plastic and cermet resistive materials?

A: Both materials are suitable for linear potentiometer applications. Cermet (ceramic-metal composite) used in the 51CAD-E24-A20L offers improved environmental sealing, temperature stability (±150ppm/°C), and durability compared to conductive plastic. The 51CAD-E24-A20L includes sealed construction for enhanced protection.

Q: Is the 51CAD-E24-A20L available in active inventory?

A: Yes. The 51CAD-E24-A20L is classified as an active product with 5738 pieces in stock, compared to the obsolete 308NPC100K status. This ensures long-term availability for production and replacement applications.

Q: Do both parts meet current regulatory requirements?

A: The 51CAD-E24-A20L meets current ROHS3 compliance and is REACH affected, representing current regulatory standards. The 308NPC100K is RoHS compliant but obsolete. For new designs and ongoing production, the 51CAD-E24-A20L is the appropriate selection.

Q: What is the rotation angle difference between these components?

A: The 308NPC100K has 295° rotation while the 51CAD-E24-A20L has 290° rotation. This 5° difference is within acceptable tolerance for linear potentiometer applications and does not affect functional compatibility.