RNF12FTC340R Equivalent & Substitute Parts

Part Overview

The RNF12FTC340R is a 340 Ohm ±1% metal film axial through-hole resistor rated at 0.5W (1/2W) 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 maintains Active product status with 801 units in current inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained while accommodating different packaging formats or manufacturer sourcing requirements.

Substiute Parts

RNF12FTC340R

Stackpole Electronics IncIn Stock: 842RNF12FTC340R Datasheet

Current PartRFQ

CMF55340R00FHEB

Vishay DaleIn Stock: 2917CMF55340R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF12FTC340R are qualified based on the following electrical and mechanical parameters:

• Resistance value: 340 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 0.5W / 1/2W (exact match required)
• Composition: Metal Film (exact match required)
• Package configuration: Axial through-hole (exact match required)
• Temperature coefficient: ±50ppm/°C (exact match required)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected (minimum requirements)

The CMF55340R00FHEB from Vishay Dale meets all electrical specifications and maintains equivalent safety and environmental certifications. Physical dimensions differ due to manufacturing tolerances within the axial package category, and the operating temperature range extends to 175°C (compared to 155°C for the primary part), providing additional thermal margin. Packaging format differs (Cut Tape versus Tape & Reel), reflecting different supply chain configurations rather than functional differences.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC340R and CMF55340R00FHEB are Active status components meeting ROHS3 and REACH compliance requirements. Selection between these parts should be based on:

• Packaging requirements: Tape & Reel format for automated assembly processes versus Cut Tape for manual or lower-volume applications
• Physical space constraints: The CMF55340R00FHEB features reduced axial dimensions (0.090" diameter, 0.240" length) compared to the RNF12FTC340R (0.108" diameter, 0.344" length), providing design flexibility in compact layouts
• Thermal margin: The CMF55340R00FHEB operating range extends to 175°C, offering additional headroom for high-temperature applications
• Moisture resistance: The CMF55340R00FHEB includes moisture-resistant features, beneficial for humid or corrosive environments
• Supply chain continuity: Inventory availability and lead time considerations for production scheduling

Frequently Asked Questions (FAQ)

Q: Can the CMF55340R00FHEB directly replace the RNF12FTC340R in existing designs?

A: Yes, provided that physical dimensions are accommodated in the PCB layout. The CMF55340R00FHEB is smaller in both diameter and length, requiring verification that lead spacing and component placement remain compatible with existing footprints.

Q: Are there electrical performance differences between these parts?

A: No. Both parts share identical resistance (340 Ohms), tolerance (±1%), power rating (0.5W), composition (metal film), and temperature coefficient (±50ppm/°C). Electrical behavior is equivalent.

Q: What is the significance of the extended operating temperature range in the CMF55340R00FHEB?

A: The CMF55340R00FHEB operates to 175°C versus 155°C for the RNF12FTC340R. This provides additional thermal margin in applications approaching the upper temperature limit, reducing risk of performance degradation or component failure in high-temperature environments.

Q: How do packaging formats affect component selection?

A: Tape & Reel (TR) packaging is optimized for high-speed automated assembly lines, while Cut Tape (CT) is suitable for manual assembly, prototyping, or lower-volume production. The choice depends on manufacturing process requirements rather than electrical performance.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the RNF12FTC340R and CMF55340R00FHEB are ROHS3 Compliant and REACH Unaffected, meeting current environmental and hazardous substance restrictions for electronic components.

Q: Does the moisture-resistant feature of the CMF55340R00FHEB provide functional advantages?

A: Moisture resistance improves long-term reliability in humid, marine, or corrosive environments by reducing the risk of surface degradation and electrical leakage. This feature is beneficial but not required for standard indoor applications.