RNF14FTC8K45 Equivalent & Substitute Parts

Part Overview

The RNF14FTC8K45 is an 8.45 kOhms ±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-grade construction, designed for applications requiring precision resistance values with reliable performance across industrial temperature ranges. The part is currently Active in product status with 1121 units in stock inventory. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

RNF14FTC8K45

Stackpole Electronics IncIn Stock: 1157RNF14FTC8K45 Datasheet

Current PartRFQ

CMF558K4500FHEB

Vishay DaleIn Stock: 1573CMF558K4500FHEB Datasheet

UpgradeRFQ

CMF508K4500FHEB

Vishay DaleIn Stock: 1402CMF508K4500FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC8K45 are qualified based on the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Resistance value: 8.45 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Temperature Coefficient: ±50ppm/°C
• Package Type: Axial (through-hole)
• RoHS Compliance: ROHS3 Compliant

Allowable Variations:

• Power rating may be equal or higher (0.25W or greater)
• Operating temperature range may be equal or extended
• Physical dimensions may vary within axial package constraints
• Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical compatibility

Two substitute parts meet these criteria: CMF508K4500FHEB (manufacturer-recommended, 1/4W rating) and CMF558K4500FHEB (upgraded 1/2W rating).

Parameter Comparison

Engineering Selection Recommendations

CMF508K4500FHEB (Manufacturer-Recommended Substitute): This part provides direct electrical equivalence to the RNF14FTC8K45 with identical power rating (0.25W), resistance, tolerance, and temperature coefficient. The extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C) provides additional thermal margin. Both parts are ROHS3 compliant and Active in product status. The CMF508K4500FHEB includes moisture-resistant features and is available in Cut Tape packaging. Physical dimensions are smaller, which may require PCB layout verification for through-hole mounting compatibility.

CMF558K4500FHEB (Upgrade Substitute): This part offers the same electrical specifications as the main part with an upgraded power rating (0.5W vs. 0.25W). The higher power rating provides increased thermal headroom for applications with higher dissipation margins. Extended operating temperature range and moisture-resistant features are included. This substitute is suitable for designs where increased power handling capacity is beneficial or where thermal stress reduction is desired. Physical dimensions are comparable to the main part.

Both substitute parts maintain ROHS3 compliance, Active product status, and identical electrical performance within specified tolerances.

Frequently Asked Questions (FAQ)

Q: Can CMF508K4500FHEB be used as a direct replacement for RNF14FTC8K45? A: Yes. Both parts have identical resistance (8.45 kOhms), tolerance (±1%), power rating (0.25W), temperature coefficient (±50ppm/°C), and composition (metal film). The CMF508K4500FHEB has a smaller physical footprint and extended operating temperature range. PCB layout verification is required to confirm through-hole mounting compatibility due to dimensional differences.

Q: What is the advantage of using CMF558K4500FHEB over CMF508K4500FHEB? A: The CMF558K4500FHEB has a higher power rating (0.5W vs. 0.25W), providing increased thermal capacity and reduced operating stress in high-dissipation applications. Electrical performance and temperature coefficient remain identical. Physical dimensions are more similar to the original RNF14FTC8K45.

Q: Are there any compatibility concerns with substitute parts? A: All substitute parts are axial through-hole components with identical electrical specifications. Physical dimensions vary slightly; verify PCB hole spacing and component clearance before assembly. All parts are ROHS3 compliant and suitable for the same application environments.

Q: Why do substitute parts have extended operating temperature ranges? A: The Vishay Dale CMF series components are rated to -55°C ~ 175°C, compared to the Stackpole RNF series -55°C ~ 155°C. This represents the manufacturer's specification for each product line and provides additional thermal margin in applications approaching upper temperature limits.

Q: Can packaging format (Tape & Reel vs. Cut Tape) affect electrical performance? A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical and mechanical properties remain identical regardless of packaging type.