309NPC1K Equivalent & Substitute Parts

Part Overview

The 309NPC1K is a 1 kΩ linear panel mount potentiometer manufactured by Honeywell Sensing and Productivity Solutions. This component features 1 watt power rating, cermet resistive material, and PC pin termination suitable for audio and instrumentation applications. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Key Parameters

Parameter	Value
Resistance	1 kΩ
Power Rating	1 W
Taper	Linear
Number of Gangs	1
Resistive Material	Cermet
Termination Style	PC Pins
Mounting Type	Panel Mount
Bushing Thread	1/4-32
Actuator Type	Slotted
Rotation	295°

Substitute Part Grouping Explanation

Substitution of the 309NPC1K is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Parameters:

Resistance value: 1 kΩ
Power rating: 1 W
Taper characteristic: Linear
Tolerance: ±10%
Resistive material: Cermet

Mechanical Parameters:

Termination: PC Pins
Mounting: Panel Mount
Bushing thread: 1/4-32
Actuator type: Slotted
Actuator length: 0.750" (19.05mm)
Actuator diameter: 0.125" (3.18mm)
Number of gangs: 1
Number of turns: 1

The substitute part 51CAD-E24-A10L from Bourns Inc. meets all critical electrical specifications and mechanical interface requirements. Minor variations in body dimensions and rotation angle (290° vs 295°) remain within acceptable tolerance for panel mount applications with identical bushing specifications.

Parameter Comparison

Parameter	309NPC1K (Honeywell)	51CAD-E24-A10L (Bourns)	Match Status
Resistance (Ohms)	1k	1k	Equivalent
Tolerance	±10%	±10%	Equivalent
Power (Watts)	1W	1W	Equivalent
Taper	Linear	Linear	Equivalent
Number of Gangs	1	1	Equivalent
Resistive Material	Cermet	Cermet	Equivalent
Termination Style	PC Pins	PC Pins	Equivalent
Actuator Type	Slotted	Slotted	Equivalent
Actuator Length	0.750" (19.05mm)	0.750" (19.05mm)	Equivalent
Actuator Diameter	0.125" (3.18mm)	0.125" (3.18mm)	Equivalent
Bushing Thread	1/4-32	1/4-32	Equivalent
Mounting Type	Panel Mount	Panel Mount	Equivalent
Number of Turns	1	1	Equivalent
Rotation	295°	290°	Compatible
Temperature Coefficient	Not specified	±150ppm/°C	Substitute specified
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant
Product Status	Obsolete	Active	Substitute active

Engineering Selection Recommendations

The 51CAD-E24-A10L potentiometer from Bourns Inc. is a direct functional substitute for the obsolete 309NPC1K. Selection is based on the following engineering criteria:

Compliance and Availability: The 51CAD-E24-A10L maintains active product status with 1130 units in stock, ensuring supply chain continuity. Both components are RoHS compliant and carry identical ECCN and HTSUS classifications, supporting regulatory requirements.

Electrical Equivalence: All critical electrical parameters are identical: 1 kΩ resistance, 1 W power rating, ±10% tolerance, linear taper, and cermet resistive material. The substitute provides specified temperature coefficient performance (±150ppm/°C) not documented in the original part.

Mechanical Compatibility: Interface specifications are fully equivalent. Both components feature identical bushing threads (1/4-32), actuator dimensions (0.750" length, 0.125" diameter), and PC pin termination. The 5° rotation difference (290° vs 295°) is within acceptable mechanical tolerance for panel mount applications.

Environmental Considerations: The 51CAD-E24-A10L includes sealed construction and REACH compliance status, providing enhanced environmental protection compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 51CAD-E24-A10L directly replace the 309NPC1K in existing designs?

A: Yes. The substitute part meets all electrical and mechanical interface requirements. Identical bushing threads, actuator dimensions, and PC pin termination enable direct mechanical and electrical substitution in panel mount applications.

Q: What is the significance of the 5° rotation difference?

A: The 309NPC1K specifies 295° rotation while the 51CAD-E24-A10L specifies 290° rotation. This 5° difference is within acceptable mechanical tolerance for potentiometer applications and does not affect functional performance in standard audio and instrumentation circuits.

Q: Are there compliance differences between the two parts?

A: Both components are RoHS compliant. The 51CAD-E24-A10L carries ROHS3 designation and includes REACH compliance status, providing enhanced regulatory coverage. Both share identical ECCN (EAR99) and HTSUS (8533.40.8050) classifications.

Q: What packaging differences exist?

A: The 309NPC1K is supplied without specified packaging notation. The 51CAD-E24-A10L is supplied in Tray packaging. This difference does not affect component functionality or electrical performance.

Q: Does the substitute provide temperature coefficient specification?

A: Yes. The 51CAD-E24-A10L specifies ±150ppm/°C temperature coefficient, whereas the original 309NPC1K does not document this parameter. This specification provides additional design margin for temperature-sensitive applications.

Q: Are both parts suitable for audio applications?

A: Yes. Both components are cermet linear potentiometers with identical electrical characteristics suitable for audio and instrumentation applications. The 51CAD-E24-A10L includes sealed construction for enhanced environmental protection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message