RNF14FAD249R Equivalent & Substitute Parts

Part Overview

The RNF14FAD249R is a 249 Ohm ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-rated construction, operating across -55°C to 155°C. The part is currently active in production with ROHS3 compliance and is available in Tape & Box packaging. Substitute parts are identified when identical electrical specifications (resistance value, tolerance, power rating) and mechanical compatibility (axial package, through-hole termination) are maintained, or when upgraded performance characteristics are acceptable for the application.

Substiute Parts

RNF14FAD249R

Stackpole Electronics IncIn Stock: 891RNF14FAD249R Datasheet

Current PartRFQ

RNF14FTD249R

Stackpole Electronics IncIn Stock: 29701RNF14FTD249R Datasheet

DirectRFQ

CMF55249R00FHEB

Vishay DaleIn Stock: 8328CMF55249R00FHEB Datasheet

UpgradeRFQ

CPF1249R00BEEE6

Vishay DaleIn Stock: 2437CPF1249R00BEEE6 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FAD249R are categorized based on the following substitution criteria:

Direct Substitutes (Identical Electrical & Mechanical Specifications):

• Same resistance value: 249 Ohms
• Same tolerance: ±1%
• Same power rating: 0.25W (1/4W)
• Same package: Axial through-hole
• Same composition: Metal Film
• Packaging format difference only (Tape & Box vs. Cut Tape)

Upgrade Substitutes (Enhanced Performance Parameters):

• Identical resistance and tolerance
• Higher power rating (0.5W or 1W) allowing operation in higher dissipation environments
• Improved temperature coefficient (lower values indicate better stability)
• Extended operating temperature range
• Enhanced safety features (Flame Proof vs. Flame Retardant)
• Maintained axial through-hole package compatibility

Parameter Comparison

Engineering Selection Recommendations

RNF14FTD249R (Direct Substitute): Use this part when packaging format change from Tape & Box to Cut Tape is acceptable. All electrical and mechanical specifications are identical to the RNF14FAD249R. Both parts maintain the same power rating, tolerance, and operating temperature range. This substitution is suitable for applications where component sourcing flexibility is required without design modification.

CMF55249R00FHEB (Upgrade Substitute): This Vishay Dale part provides doubled power dissipation capability (0.5W vs. 0.25W) with improved temperature coefficient (±50ppm/°C vs. ±100ppm/°C) and extended upper operating temperature to 175°C. The addition of moisture resistance enhances reliability in humid environments. Physical dimensions are slightly smaller. This upgrade is applicable when circuits require enhanced thermal performance or extended temperature operation while maintaining the same resistance and tolerance specifications.

CPF1249R00BEEE6 (Premium Upgrade Substitute): This part offers the highest performance tier with 1W power rating, superior tolerance (±0.1% vs. ±1%), and the lowest temperature coefficient (±25ppm/°C). Operating temperature extends to 230°C with flame-proof construction. This substitution is appropriate for precision applications requiring tighter tolerance control, higher power dissipation capability, or extreme temperature environments. All parts maintain ROHS3 compliance and active production status.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD249R replace RNF14FAD249R directly in my circuit?

A: Yes. RNF14FTD249R is a direct electrical and mechanical equivalent. The only difference is packaging format (Cut Tape vs. Tape & Box). No circuit modifications are required.

Q: What is the primary advantage of using CMF55249R00FHEB over the original part?

A: CMF55249R00FHEB doubles the power dissipation rating from 0.25W to 0.5W and improves temperature stability with a lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C). It also extends the maximum operating temperature to 175°C and adds moisture resistance.

Q: Is CPF1249R00BEEE6 compatible with the same PCB footprint as RNF14FAD249R?

A: Both parts use axial through-hole packages with 2 terminations. However, CPF1249R00BEEE6 has slightly smaller physical dimensions (0.090" Dia x 0.240" L vs. 0.093" Dia x 0.250" L). Verify PCB hole spacing and component clearance before substitution.

Q: Can I use a higher power-rated resistor in place of the 0.25W part?

A: Yes. Higher power-rated resistors (0.5W or 1W) can be used in circuits designed for 0.25W components. The resistor will operate at lower stress levels, improving reliability. Verify physical dimensions fit the PCB layout.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. RNF14FTD249R, CMF55249R00FHEB, and CPF1249R00BEEE6 are all ROHS3 compliant and suitable for applications requiring environmental compliance.

Q: What does temperature coefficient mean in resistor selection?

A: Temperature coefficient indicates how much the resistance value changes with temperature. A lower value (±25ppm/°C vs. ±100ppm/°C) means better stability across temperature variations. CPF1249R00BEEE6 provides the most stable performance.

Q: Which substitute part should I choose for a high-reliability application?

A: CPF1249R00BEEE6 offers the best performance metrics: highest power rating (1W), tightest tolerance (±0.1%), lowest temperature coefficient (±25ppm/°C), flame-proof construction, and widest operating temperature range (-65°C ~ 230°C).