RNF14BTC681R Equivalent & Substitute Parts

Part Overview

The RNF14BTC681R is a 681 Ohm metal film axial resistor manufactured by Stackpole Electronics Inc. This 0.25W, 1/4W through-hole component features ±0.1% tolerance, flame retardant coating, and safety-rated construction. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, application upgrades, or design optimization needs.

Substiute Parts

RNF14BTC681R

Stackpole Electronics IncIn Stock: 855RNF14BTC681R Datasheet

Current PartRFQ

CMF55681R00BHEB

Vishay DaleIn Stock: 1792CMF55681R00BHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14BTC681R is determined by the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 681 Ohms
• Tolerance: ±0.1%
• Temperature coefficient: ±50ppm/°C
• Composition: Metal Film

Mechanical Parameters (Must Match):

• Package type: Axial through-hole
• Number of terminations: 2

Allowable Variations:

• Power rating: Equal or greater than 0.25W
• Operating temperature range: Equal or greater than -55°C to 155°C
• Physical dimensions: Minor variations acceptable within axial package constraints
• Packaging format: Tape & Reel or Cut Tape

Compliance Requirements:

• RoHS3 compliance maintained
• REACH unaffected status maintained

Parameter Comparison

Engineering Selection Recommendations

The CMF55681R00BHEB qualifies as a direct substitute for the RNF14BTC681R based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical resistance (681 Ohms), tolerance (±0.1%), and temperature coefficient (±50ppm/°C). Metal film composition ensures consistent performance characteristics.

Power Rating Upgrade: The substitute's 0.5W rating exceeds the original 0.25W specification. This represents a design upgrade that maintains backward compatibility while providing additional thermal margin in the application circuit.

Temperature Performance: The substitute's -55°C to 175°C operating range encompasses the original -55°C to 155°C specification, ensuring thermal compatibility across all intended operating conditions.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

Mechanical Compatibility: Axial package geometry remains consistent. Minor dimensional variations (0.093" to 0.090" diameter, 0.250" to 0.240" length) fall within acceptable tolerances for through-hole PCB mounting.

Enhanced Features: The substitute includes moisture-resistant coating in addition to flame retardant properties, providing additional environmental protection without compromising the original design intent.

Frequently Asked Questions (FAQ)

Q: Can CMF55681R00BHEB replace RNF14BTC681R in existing designs?

A: Yes. Both parts share identical electrical specifications (681 Ohms, ±0.1% tolerance, ±50ppm/°C temperature coefficient) and axial through-hole package type. The substitute's higher power rating (0.5W vs 0.25W) and extended temperature range (-55°C to 175°C vs -55°C to 155°C) provide design margin without requiring circuit modification.

Q: Are there physical mounting differences?

A: Minor dimensional differences exist. The substitute measures 0.090" diameter x 0.240" length versus the original 0.093" diameter x 0.250" length. Both conform to standard axial through-hole PCB hole spacing and are mechanically compatible with existing board layouts.

Q: Does the substitute maintain the same reliability characteristics?

A: Both parts are metal film resistors with identical tolerance and temperature coefficient specifications. The substitute's additional moisture-resistant coating may enhance long-term reliability in humid environments while maintaining the same electrical performance.

Q: What packaging formats are available?

A: The original RNF14BTC681R is supplied in Tape & Reel format. The substitute CMF55681R00BHEB is available in Cut Tape format. Both formats are suitable for automated assembly processes.

Q: Are both parts RoHS3 compliant?

A: Yes. Both RNF14BTC681R and CMF55681R00BHEB maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

Q: Can the substitute be used in high-temperature applications?

A: The substitute's operating range extends to 175°C, compared to the original 155°C maximum. This provides additional thermal margin for applications requiring extended temperature performance within the substitute's rated limits.