RNF12FTC140R Equivalent & Substitute Parts

Part Overview

The RNF12FTC140R is a 140 Ohm ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction suitable for industrial and consumer electronics applications. The part is currently in active production status with 1010 units available in inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained while accommodating supply chain variations or packaging preferences.

Substiute Parts

RNF12FTC140R

Stackpole Electronics IncIn Stock: 1111RNF12FTC140R Datasheet

Current PartRFQ

CMF55140R00FHEB

Vishay DaleIn Stock: 1782CMF55140R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC140R is determined by the following critical parameters:

• Electrical Equivalence: Resistance value (140 Ohms), tolerance (±1%), and power rating (0.5W) must be identical
• Composition: Metal film construction required to maintain stability and temperature coefficient performance
• Package Compatibility: Axial through-hole configuration with 2 terminations
• Temperature Performance: Operating temperature range must support the application requirements
• Regulatory Compliance: RoHS3 compliance and REACH unaffected status required
• Physical Dimensions: Axial package dimensions must be compatible with PCB layout and mechanical constraints

The CMF55140R00FHEB from Vishay Dale meets all substitution criteria while offering enhanced moisture resistance and extended operating temperature range to 175°C.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC140R and CMF55140R00FHEB are active production components with full RoHS3 compliance and REACH unaffected status, qualifying them for equivalent circuit applications. Selection between these parts should be based on:

RNF12FTC140R (Stackpole): Primary choice when tape and reel packaging is required for automated assembly processes, or when the standard operating temperature range of -55°C to 155°C is sufficient for the application.

CMF55140R00FHEB (Vishay Dale): Suitable alternative when moisture-resistant construction is beneficial, extended operating temperature capability to 175°C is required, or cut tape packaging accommodates the procurement workflow. The smaller physical dimensions may provide layout advantages in space-constrained designs.

Both parts maintain identical electrical performance and regulatory compliance, ensuring functional interchangeability within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can CMF55140R00FHEB be used as a direct replacement for RNF12FTC140R?

A: Yes. Both components share identical resistance (140 Ohms), tolerance (±1%), power rating (0.5W), composition (metal film), and temperature coefficient (±50ppm/°C). The CMF55140R00FHEB offers extended temperature range and moisture resistance as additional benefits. Physical dimensions differ slightly; verify PCB layout compatibility before substitution.

Q: What is the significance of the different packaging formats (Tape & Reel vs. Cut Tape)?

A: Tape & Reel (TR) packaging is optimized for high-volume automated assembly using pick-and-place equipment. Cut Tape (CT) packaging is suitable for lower-volume production, manual assembly, or mixed-component kitting. Selection depends on manufacturing process requirements rather than electrical performance.

Q: Are there any thermal performance differences between these parts?

A: Both components maintain the same temperature coefficient (±50ppm/°C) and power dissipation rating (0.5W). The CMF55140R00FHEB supports operation to 175°C compared to 155°C for the RNF12FTC140R, providing additional thermal margin in high-temperature environments.

Q: Do physical dimension differences affect circuit performance?

A: Physical dimensions do not affect electrical performance. However, the CMF55140R00FHEB's smaller size (0.090" Dia x 0.240" L versus 0.108" Dia x 0.344" L) may influence PCB layout spacing and mechanical clearance requirements. Verify component placement and lead routing compatibility with your specific board design.

Q: Are both parts suitable for safety-critical applications?

A: Both components feature safety-grade construction with flame retardant coating and are ROHS3 compliant. Compliance with specific safety standards (IEC, UL, etc.) should be verified against your application requirements and relevant certification documentation.