RNF12FTD221R Equivalent & Substitute Parts

Part Overview

The RNF12FTD221R is a 221 Ohm ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component is classified as Active product status with flame retardant coating and safety features suitable for industrial and commercial applications. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and compliance certifications align with the original component, enabling seamless integration in circuit designs while accommodating supply chain variations or packaging preferences.

Substiute Parts

RNF12FTD221R

Stackpole Electronics IncIn Stock: 2339RNF12FTD221R Datasheet

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RNF12FTC221R

Stackpole Electronics IncIn Stock: 968RNF12FTC221R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTD221R is determined by strict alignment of the following electrical and mechanical parameters:

• Resistance value: 221 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 (exact match required)
• Operating temperature range: -55°C to 155°C (minimum requirement)
• RoHS compliance: ROHS3 Compliant (certification requirement)

The RNF12FTC221R qualifies as a direct substitute based on identical electrical specifications and mechanical dimensions. The primary distinction is packaging format: RNF12FTD221R is supplied in Cut Tape (CT) configuration, while RNF12FTC221R is supplied in Tape & Reel (TR) configuration. Both components share the same axial physical dimensions (0.108" Dia x 0.344" L / 2.75mm x 8.75mm) and meet all compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

Both RNF12FTD221R and RNF12FTC221R are Active status components manufactured by Stackpole Electronics Inc with full ROHS3 compliance and REACH unaffected certification. Selection between these parts is determined by procurement and assembly requirements rather than electrical performance:

• RNF12FTD221R (Cut Tape packaging) is suitable for manual assembly, small-batch production, or applications requiring individual component handling.
• RNF12FTC221R (Tape & Reel packaging) is optimized for automated pick-and-place assembly and high-volume manufacturing environments.

Both components satisfy identical electrical specifications, mechanical compatibility, and regulatory requirements. The temperature coefficient difference (±100ppm/°C vs ±50ppm/°C) does not affect substitution eligibility, as both values fall within acceptable ranges for standard resistor applications at the specified operating temperature range of -55°C to 155°C.

Frequently Asked Questions (FAQ)

Q: Can RNF12FTC221R replace RNF12FTD221R in existing designs?

A: Yes. Both components are electrically and mechanically identical with matching resistance (221 Ohms), tolerance (±1%), power rating (0.5W), composition (metal film), and axial package dimensions. The only difference is packaging format (Tape & Reel vs Cut Tape), which does not affect circuit performance.

Q: What is the significance of the packaging format difference?

A: Packaging format affects supply chain logistics and assembly processes. Cut Tape (CT) is typically used for manual or low-volume assembly, while Tape & Reel (TR) is designed for automated assembly equipment. Electrically and mechanically, the components are identical.

Q: Are both parts RoHS compliant?

A: Yes. Both RNF12FTD221R and RNF12FTC221R are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: Does the temperature coefficient difference affect substitution?

A: No. The RNF12FTD221R has a temperature coefficient of ±100ppm/°C, while RNF12FTC221R has ±50ppm/°C. Both operate across the identical temperature range (-55°C to 155°C) and are suitable for the same applications. The lower coefficient of the substitute part represents equivalent or improved performance.

Q: Can these axial resistors be used in PCB-mounted applications?

A: Yes. Both components are through-hole axial resistors with standard lead terminations (2 terminations) compatible with conventional PCB drilling and soldering processes.