RNF14FTC78K7 Equivalent & Substitute Parts

Part Overview

The RNF14FTC78K7 is a 78.7 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 689 units in stock. Substitute parts may be required due to inventory constraints, application-specific power rating upgrades, or design optimization needs.

Substiute Parts

RNF14FTC78K7

Stackpole Electronics IncIn Stock: 713RNF14FTC78K7 Datasheet

Current PartRFQ

CMF5578K700FHEB

Vishay DaleIn Stock: 1800CMF5578K700FHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RNF14FTC78K7 is permissible with the CMF5578K700FHEB based on the following critical parameters:

Matching Parameters (Required for Substitution):

• Resistance value: 78.7 kOhms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Package type: Axial (identical)
• Temperature coefficient: ±50ppm/°C (identical)
• RoHS compliance: ROHS3 Compliant (identical)

Allowable Variation:

• Power rating: The substitute part is rated at 0.5W (1/2W), which exceeds the original 0.25W (1/4W) specification. This represents an upgrade that maintains backward compatibility in circuits designed for the lower power rating.
• Operating temperature range: The substitute extends to 175°C maximum versus 155°C for the original, providing enhanced thermal performance.
• Physical dimensions: Minor variations in diameter and length are acceptable within axial package tolerances.

Parameter Comparison

Engineering Selection Recommendations

The CMF5578K700FHEB serves as a direct electrical substitute for the RNF14FTC78K7 in applications where the circuit design permits a higher power rating. Both components maintain identical resistance values, tolerance specifications, and temperature coefficients, ensuring equivalent electrical performance in precision circuits.

Selection of the substitute part is appropriate when:

• Higher power dissipation capability is beneficial or required by circuit design margins
• Extended operating temperature range to 175°C is advantageous for thermal management
• Moisture-resistant construction provides additional environmental protection
• Inventory availability of the substitute part supports production schedules

Both parts maintain Active product status and full ROHS3 compliance, confirming ongoing manufacturer support and regulatory alignment. The substitute part's enhanced specifications represent a performance upgrade without introducing compatibility concerns for circuits originally specified with the RNF14FTC78K7.

Frequently Asked Questions (FAQ)

Q: Can the CMF5578K700FHEB replace the RNF14FTC78K7 in existing circuit designs?

A: Yes. The substitute part maintains identical resistance value (78.7 kOhms), tolerance (±1%), temperature coefficient (±50ppm/°C), and composition (metal film). The higher power rating (0.5W versus 0.25W) and extended temperature range represent performance enhancements that do not compromise compatibility with circuits designed for the original part.

Q: What is the significance of the power rating difference?

A: The substitute part's 0.5W rating provides double the power dissipation capability compared to the original 0.25W specification. This upgrade allows the component to operate safely in applications with higher current or voltage stress, while remaining fully compatible with circuits designed for lower power dissipation.

Q: Are there physical dimension differences between these parts?

A: Both components use axial package construction. The substitute part measures 0.090" diameter × 0.240" length (2.29mm × 6.10mm) compared to the original 0.093" diameter × 0.250" length (2.35mm × 6.35mm). These minor variations fall within standard axial package tolerances and do not affect PCB layout or mechanical fit.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the RNF14FTC78K7 and CMF5578K700FHEB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. They share identical HTSUS classification (8533.21.0090), confirming equivalent regulatory and compliance status.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for automated assembly processes. Cut Tape (CT) packaging provides components on tape segments cut to specified lengths, typically for smaller quantity orders or manual assembly. Both formats contain identical components; packaging format selection depends on assembly process requirements.

Q: Why does the substitute part have higher inventory availability?

A: The CMF5578K700FHEB shows 1706 units in stock compared to 689 units for the RNF14FTC78K7. Inventory levels reflect current supply chain conditions and demand patterns. The substitute part's higher availability may support production continuity when the original part inventory is constrained.