RNF14FAC143K Equivalent & Substitute Parts

Part Overview

The RNF14FAC143K is a 143 kOhms ±1% 0.25W axial through-hole resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for applications requiring precision resistance values with tight tolerance specifications. The part is currently active in production with 1073 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

RNF14FAC143K

Stackpole Electronics IncIn Stock: 1097RNF14FAC143K Datasheet

Current PartRFQ

CMF55143K00FHEB

Vishay DaleIn Stock: 1793CMF55143K00FHEB Datasheet

UpgradeRFQ

CMF50143K00FHEB

Vishay DaleIn Stock: 2185CMF50143K00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FAC143K are qualified based on the following electrical and mechanical parameters:

• Identical resistance value: 143 kOhms
• Identical tolerance: ±1%
• Identical composition: Metal Film
• Identical temperature coefficient: ±50ppm/°C
• Identical package type: Axial through-hole
• Identical termination count: 2
• Compliance with ROHS3 and REACH requirements
• Operating temperature range must encompass or exceed the original specification

Power rating variations are permitted when the substitute part maintains equal or greater power dissipation capability. Physical dimensions may vary within the constraints of axial package geometry. Both substitute parts meet these criteria while offering alternative sourcing from Vishay Dale (CMF series).

Parameter Comparison

Engineering Selection Recommendations

CMF50143K00FHEB (MFR Recommended Substitute): This part provides direct electrical equivalence to the RNF14FAC143K with identical power rating (0.25W) and resistance specifications. The CMF50 series offers an extended operating temperature range (-55°C ~ 175°C) compared to the original part. ROHS3 compliance is confirmed. Physical dimensions are smaller, which may provide layout advantages in space-constrained applications. This part is recommended for direct replacement in applications where the original RNF14FAC143K specifications are required.

CMF55143K00FHEB (Upgrade Substitute): This part provides electrical equivalence with an increased power rating (0.5W vs. 0.25W), offering enhanced thermal margin in applications subject to power dissipation stress. The CMF55 series maintains identical resistance, tolerance, and temperature coefficient specifications. Operating temperature range extends to 175°C. ROHS3 compliance is confirmed. This part is suitable for applications where increased power dissipation capability is beneficial or where thermal headroom is a design consideration.

Both substitute parts are active products with confirmed inventory availability and meet all regulatory compliance requirements specified for the original part.

Frequently Asked Questions (FAQ)

Q: Can CMF50143K00FHEB be used as a direct replacement for RNF14FAC143K?

A: Yes. Both parts share identical electrical specifications: 143 kOhms resistance, ±1% tolerance, 0.25W power rating, ±50ppm/°C temperature coefficient, and axial package configuration. The CMF50143K00FHEB offers an extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C) and smaller physical dimensions while maintaining full electrical compatibility.

Q: What is the difference between CMF50143K00FHEB and CMF55143K00FHEB?

A: The primary difference is power rating: CMF50143K00FHEB is rated at 0.25W (1/4W), while CMF55143K00FHEB is rated at 0.5W (1/2W). Both maintain identical resistance values, tolerance, and temperature coefficients. The CMF55 variant provides increased thermal capacity for applications with higher power dissipation requirements. Physical dimensions differ slightly between the two series.

Q: Are there any packaging differences between the main part and substitutes?

A: Yes. The RNF14FAC143K is supplied in Tape & Box (TB) packaging, while both CMF series substitutes are supplied in Cut Tape (CT) packaging. This affects handling and assembly processes but does not impact electrical performance or component functionality.

Q: Do all parts meet RoHS compliance requirements?

A: The RNF14FAC143K and CMF50143K00FHEB are ROHS3 compliant. The CMF55143K00FHEB is also ROHS3 compliant. All parts meet REACH requirements as specified in their respective datasheets.

Q: What is the temperature coefficient specification and why is it important?

A: All three parts maintain a temperature coefficient of ±50ppm/°C. This specification defines the resistance value change per degree Celsius of temperature variation. This parameter is critical for precision applications where resistance stability across temperature ranges is required.

Q: Can CMF55143K00FHEB be used in place of RNF14FAC143K in all applications?

A: CMF55143K00FHEB is electrically compatible with RNF14FAC143K for all applications. The increased power rating (0.5W vs. 0.25W) provides additional thermal margin and does not create incompatibility. Physical dimension differences are minimal and typically do not affect PCB layout in standard through-hole designs.