RNF12FTD49R9 Equivalent & Substitute Parts

Part Overview

The RNF12FTD49R9 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 is designed for applications requiring precision resistance with flame retardant coating and safety features. The part maintains Active product status with 792 units in current inventory. Substitute parts are identified when original stock becomes unavailable or when procurement lead times require alternative sourcing from qualified manufacturers offering equivalent electrical and mechanical specifications.

Substiute Parts

RNF12FTD49R9

Stackpole Electronics IncIn Stock: 889RNF12FTD49R9 Datasheet

Current PartRFQ

CMF5549R900FKEB

Vishay DaleIn Stock: 1426CMF5549R900FKEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTD49R9 is determined by the following critical parameters:

Electrical Equivalence Requirements:

• Resistance value: 49.9 Ohms (exact match)
• Tolerance: ±1% (exact match)
• Power rating: 0.5W / 1/2W (exact match)
• Temperature coefficient: ±100ppm/°C (exact match)
• Composition: Metal Film (exact match)

Mechanical Compatibility Requirements:

• Package type: Axial through-hole (exact match)
• Number of terminations: 2 (exact match)

Compliance Requirements:

• RoHS3 Compliant status (required)
• ECCN classification: EAR99 (required)
• HTSUS code: 8533.21.0090 (required)

The CMF5549R900FKEB manufactured by Vishay Dale meets all electrical and mechanical equivalence criteria. While the operating temperature range extends to 175°C (compared to 155°C for the RNF12FTD49R9), this represents an expanded capability that does not compromise compatibility. Physical dimensions differ slightly due to manufacturing tolerances within the axial package category, but both components function identically in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTD49R9 and CMF5549R900FKEB are Active status components meeting ROHS3 compliance and EAR99 export classification requirements. Selection between these parts should be based on:

Primary Selection Criteria:

• Availability and procurement lead time
• Packaging format preference (Tape & Reel versus Cut Tape)
• Inventory requirements and order quantities

Secondary Considerations:

• The CMF5549R900FKEB provides extended operating temperature capability to 175°C, suitable for applications with elevated thermal environments
• The CMF5549R900FKEB includes moisture-resistant features, beneficial for applications exposed to humidity or condensation
• Physical dimension differences are negligible for standard PCB mounting applications

Both components are functionally interchangeable in circuits designed for the RNF12FTD49R9 specification.

Frequently Asked Questions (FAQ)

Q: Can CMF5549R900FKEB replace RNF12FTD49R9 in existing designs?

A: Yes. Both components share identical electrical specifications (49.9 Ohms ±1%, 0.5W, ±100ppm/°C) and axial through-hole package configuration. No circuit redesign is required.

Q: What are the physical dimension differences?

A: RNF12FTD49R9 measures 0.108" Dia x 0.344" L (2.75mm x 8.75mm). CMF5549R900FKEB measures 0.090" Dia x 0.240" L (2.29mm x 6.10mm). Both fit standard axial component footprints with appropriate lead spacing.

Q: Does the extended temperature range of CMF5549R900FKEB affect compatibility?

A: No. The CMF5549R900FKEB operating range of -55°C ~ 175°C encompasses the RNF12FTD49R9 range of -55°C ~ 155°C. This represents expanded capability without compatibility concerns.

Q: Are there packaging format differences?

A: Yes. RNF12FTD49R9 is supplied in Tape & Reel (TR) format. CMF5549R900FKEB is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements and order quantities.

Q: Do both parts meet the same compliance standards?

A: Yes. Both components are ROHS3 Compliant, classified as EAR99, and assigned HTSUS code 8533.21.0090.

Q: What is the significance of moisture-resistant features in CMF5549R900FKEB?

A: The moisture-resistant coating provides additional protection in humid or condensation-prone environments. This feature does not affect electrical performance but extends component reliability in challenging environmental conditions.