RNF12FTC49R9 Equivalent & Substitute Parts

Part Overview

The RNF12FTC49R9 is a 49.9 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 construction, designed for applications requiring precision resistance in compact axial packages. The part maintains Active product status with full RoHS3 compliance and REACH unaffected certification. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers and packaging configurations.

Substiute Parts

RNF12FTC49R9

Stackpole Electronics IncIn Stock: 825RNF12FTC49R9 Datasheet

Current PartRFQ

CMF5549R900FHEB

Vishay DaleIn Stock: 4116CMF5549R900FHEB Datasheet

MFR RecommendedRFQ

CMF5549R900FHEK

Vishay DaleIn Stock: 763CMF5549R900FHEK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC49R9 is determined by strict equivalence across the following parameters:

• Resistance value: 49.9 Ohms
• Tolerance: ±1%
• Power rating: 0.5W (1/2W)
• Composition: Metal Film
• Package configuration: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• Regulatory compliance: RoHS3 Compliant, REACH Unaffected

The identified substitute parts CMF5549R900FHEB and CMF5549R900FHEK, both manufactured by Vishay Dale, meet all electrical and mechanical equivalence criteria. Both substitutes maintain the same resistance, tolerance, power rating, composition, and temperature coefficient. Operating temperature ranges extend to -55°C ~ 175°C, providing enhanced thermal capability. Packaging configurations differ (Cut Tape and Bulk respectively) but do not affect electrical or mechanical compatibility in axial through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

Both CMF5549R900FHEB and CMF5549R900FHEK qualify as direct electrical and mechanical equivalents to the RNF12FTC49R9. Selection between substitute options depends on packaging requirements and supply chain considerations:

CMF5549R900FHEB (Cut Tape packaging) provides compatibility with automated assembly processes requiring tape-and-reel or cut tape formats. This variant includes moisture-resistant construction, extending environmental protection beyond the base specification.

CMF5549R900FHEK (Bulk packaging) accommodates manual assembly workflows or applications where individual component handling is standard practice. This variant also incorporates moisture-resistant features.

Both substitutes maintain full RoHS3 compliance and REACH unaffected status, ensuring regulatory equivalence. The extended operating temperature range (-55°C ~ 175°C) of Vishay Dale substitutes provides additional thermal margin compared to the original part specification (-55°C ~ 155°C), with no derating required for standard applications within the original temperature envelope.

Frequently Asked Questions (FAQ)

Q: Can CMF5549R900FHEB and CMF5549R900FHEK be used interchangeably with RNF12FTC49R9?

A: Yes. Both Vishay Dale parts meet all electrical specifications (49.9 Ohms ±1%, 0.5W, ±50ppm/°C) and mechanical requirements (axial through-hole package). The primary difference is packaging format: Cut Tape versus Bulk. Selection depends on assembly process requirements, not electrical compatibility.

Q: What is the impact of different packaging formats on component selection?

A: Packaging format (Tape & Reel, Cut Tape, or Bulk) affects supply chain logistics and assembly automation compatibility, not electrical or mechanical performance. Axial through-hole resistors function identically regardless of packaging format. Choose based on your manufacturing process: automated assembly typically uses tape formats, while manual assembly may use bulk packaging.

Q: Are the substitute parts rated for the same temperature range as the original?

A: The substitute parts (CMF5549R900FHEB and CMF5549R900FHEK) are rated for -55°C ~ 175°C, compared to the original RNF12FTC49R9 rated for -55°C ~ 155°C. This represents an extended upper temperature limit. For applications operating within the original -55°C ~ 155°C range, both substitutes provide equivalent or superior performance.

Q: Do the substitute parts maintain the same regulatory compliance?

A: Yes. Both CMF5549R900FHEB and CMF5549R900FHEK are RoHS3 Compliant and REACH Unaffected, matching the original part's regulatory status. No compliance gaps exist between the original and substitute parts.

Q: What additional features do the substitute parts provide?

A: The Vishay Dale substitutes include moisture-resistant construction in addition to flame retardant coating and safety features present in the original part. This represents an enhancement without introducing incompatibility.