RNF14FTC681R Equivalent & Substitute Parts

Part Overview

The RNF14FTC681R is a 681 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 construction, with an operating temperature range of -55°C to 155°C. The part is currently active in production and ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, inventory management, or supply chain optimization.

Substiute Parts

RNF14FTC681R

Stackpole Electronics IncIn Stock: 895RNF14FTC681R Datasheet

Current PartRFQ

CMF55681R00BHEB

Vishay DaleIn Stock: 1792CMF55681R00BHEB Datasheet

UpgradeRFQ

CMF50681R00FHEB

Vishay DaleIn Stock: 1491CMF50681R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC681R are qualified based on the following criteria:

Electrical Equivalence: Resistance value (681 Ohms) and temperature coefficient (±50ppm/°C) must match exactly. Tolerance and power rating determine substitution category.

Mechanical Compatibility: Axial package type is required. Physical dimensions must accommodate the same PCB footprint and mounting requirements.

Environmental & Compliance: Operating temperature range, flame retardant coating, and ROHS3 compliance status must be maintained or exceeded.

Substitution Categories:

• Upgrade Substitute (CMF55681R00BHEB): Higher power rating (0.5W vs 0.25W) and tighter tolerance (±0.1% vs ±1%) with extended operating temperature range (-55°C to 175°C). Physically smaller dimensions. Suitable for applications requiring improved performance margins.

• Direct Equivalent (CMF50681R00FHEB): Identical electrical specifications (681 Ohms ±1%, 0.25W) with extended operating temperature range (-55°C to 175°C). Physically smaller dimensions. Manufacturer-recommended direct replacement.

Parameter Comparison

Engineering Selection Recommendations

CMF50681R00FHEB (Direct Equivalent): This part is the manufacturer-recommended substitute with identical electrical specifications and tolerance. It provides extended operating temperature range (-55°C to 175°C vs -55°C to 155°C) and moisture-resistant construction. All compliance certifications (ROHS3, REACH Unaffected, EAR99) are maintained. Physical dimensions are smaller, which may require PCB layout verification for existing designs.

CMF55681R00BHEB (Upgrade Substitute): This part offers higher power dissipation capability (0.5W vs 0.25W) and superior tolerance (±0.1% vs ±1%). Extended operating temperature range and moisture-resistant features provide additional environmental protection. Selection is appropriate for applications requiring tighter tolerance specifications or higher thermal margins. Physical dimensions are smaller than the main part.

Both substitute parts maintain active product status and full compliance with applicable regulations.

Frequently Asked Questions (FAQ)

Q: Can CMF50681R00FHEB be used as a direct drop-in replacement for RNF14FTC681R?

A: CMF50681R00FHEB is electrically equivalent with identical resistance (681 Ohms), tolerance (±1%), and power rating (0.25W). Both are axial metal film resistors with matching temperature coefficients. Physical dimensions differ (0.065" Dia x 0.150" L vs 0.093" Dia x 0.250" L), requiring verification that the smaller size accommodates existing PCB footprints and mounting clearances.

Q: What is the advantage of CMF55681R00BHEB over the main part?

A: CMF55681R00BHEB provides higher power rating (0.5W vs 0.25W), tighter tolerance (±0.1% vs ±1%), and extended operating temperature range (-55°C to 175°C vs -55°C to 155°C). These characteristics allow operation with greater thermal margin and improved accuracy in precision circuits. The smaller physical size may require PCB layout adjustment.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. RNF14FTC681R, CMF55681R00BHEB, and CMF50681R00FHEB are all ROHS3 compliant and REACH unaffected.

Q: Do the substitute parts have moisture-resistant construction?

A: Both Vishay Dale substitutes (CMF55681R00BHEB and CMF50681R00FHEB) feature moisture-resistant construction in addition to flame retardant coating. The main part specifies flame retardant coating and safety features without explicit moisture resistance designation.

Q: What packaging formats are available?

A: RNF14FTC681R is supplied in Tape & Reel (TR) format. Both substitute parts are supplied in Cut Tape (CT) format. Packaging format selection depends on assembly process requirements and order quantity.