RNF14BAC681R Equivalent & Substitute Parts

Part Overview

The RNF14BAC681R is a 681 Ohm metal film axial resistor manufactured by Stackpole Electronics Inc. This 1/4W (0.25W) through-hole component features ±0.1% tolerance and flame retardant coating, designed for precision applications requiring tight tolerance specifications. The part is currently active in production with 708 units in stock. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to availability constraints, design flexibility, or application-specific performance needs.

Substiute Parts

RNF14BAC681R

Stackpole Electronics IncIn Stock: 736RNF14BAC681R Datasheet

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CMF55681R00BHEB

Vishay DaleIn Stock: 1792CMF55681R00BHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The CMF55681R00BHEB qualifies as a substitute based on the following critical parameters:

Matching Specifications:

• Resistance value: 681 Ohms (identical)
• Tolerance: ±0.1% (identical)
• Composition: Metal Film (identical)
• Temperature Coefficient: ±50ppm/°C (identical)
• Package Type: Axial (identical)
• RoHS Status: ROHS3 Compliant (identical)

Allowable Differences:

• Power Rating: 0.5W (1/2W) versus 0.25W (1/4W) — higher power rating is acceptable for applications requiring the RNF14BAC681R
• Operating Temperature Range: -55°C to 175°C versus -55°C to 155°C — extended upper temperature limit provides additional operational margin
• Physical Dimensions: Slight variation in diameter and length within axial package tolerance
• Packaging Format: Cut Tape (CT) versus Tape & Box (TB) — different supply format, same component

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14BAC681R and CMF55681R00BHEB meet ROHS3 compliance and REACH unaffected status, qualifying for regulated applications. The CMF55681R00BHEB provides higher power dissipation capability (0.5W versus 0.25W) and extended operating temperature range (-55°C to 175°C versus -55°C to 155°C), making it suitable for applications where the RNF14BAC681R specifications are met or exceeded. The identical resistance value, tolerance, temperature coefficient, and metal film composition ensure electrical equivalence in circuit performance. Selection between these parts depends on application power requirements, thermal environment, and packaging format availability.

Frequently Asked Questions (FAQ)

Q: Can the CMF55681R00BHEB replace the RNF14BAC681R in all applications?

A: Yes, provided the application does not require the specific physical dimensions or packaging format of the RNF14BAC681R. The CMF55681R00BHEB meets or exceeds all critical electrical parameters: identical resistance, tolerance, temperature coefficient, and composition. The higher power rating and extended temperature range present no compatibility issues.

Q: What is the significance of the different power ratings (0.25W vs 0.5W)?

A: Power rating indicates maximum continuous power dissipation. The CMF55681R00BHEB's 0.5W rating accommodates higher current flow without exceeding thermal limits. Applications designed for the 0.25W RNF14BAC681R will operate safely with the 0.5W substitute, as the substitute can handle equal or greater power levels.

Q: Are there physical dimension differences that affect PCB layout?

A: Both parts are axial package resistors with minor dimensional variations. RNF14BAC681R measures 0.093" diameter × 0.250" length; CMF55681R00BHEB measures 0.090" diameter × 0.240" length. These differences are within standard axial component tolerance and do not affect standard PCB footprints designed for axial resistors.

Q: What does the packaging format difference (Tape & Box vs Cut Tape) mean?

A: Tape & Box (TB) provides resistors on tape with a protective box for storage. Cut Tape (CT) provides resistors on tape without the box. Both formats contain the same component; the difference is in supply and handling. CT format typically suits higher-volume production environments.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the RNF14BAC681R and CMF55681R00BHEB are ROHS3 compliant and REACH unaffected, meeting identical regulatory standards for restricted substance use and environmental compliance.