RNF12FTC118K Equivalent & Substitute Parts

Part Overview

The RNF12FTC118K is a 118 kOhms ±1% 0.5W through-hole axial resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for applications requiring precision resistance values in compact axial packages. The part maintains Active product status with 1011 units in current inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

RNF12FTC118K

Stackpole Electronics IncIn Stock: 1039RNF12FTC118K Datasheet

Current PartRFQ

CMF55118K00FHEB

Vishay DaleIn Stock: 1683CMF55118K00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF12FTC118K are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Resistance value: 118 kOhms
• Tolerance: ±1%
• Power rating: 0.5W (1/2W)
• Composition: Metal Film
• Package: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

Acceptable Variations:

• Operating temperature range may extend beyond the original specification
• Physical dimensions may vary within axial package constraints
• Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical equivalence
• Additional features (such as moisture resistance) do not disqualify substitution

The CMF55118K00FHEB from Vishay Dale meets all critical electrical parameters and maintains full regulatory compliance, qualifying it as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The CMF55118K00FHEB qualifies as a direct electrical and mechanical substitute for the RNF12FTC118K based on identical resistance, tolerance, power rating, temperature coefficient, and composition specifications. Both parts maintain Active product status and full ROHS3 compliance with REACH Unaffected designation.

The CMF55118K00FHEB provides an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C), which represents an operational advantage without introducing compatibility concerns. The addition of moisture resistance in the Vishay Dale part does not affect substitution suitability.

Physical dimension differences between the two axial packages (0.108" Dia x 0.344" L for RNF12FTC118K versus 0.090" Dia x 0.240" L for CMF55118K00FHEB) must be evaluated within the context of specific PCB layout and mechanical constraints. Both maintain standard axial through-hole termination with 2 leads.

Packaging format differences (Tape & Reel versus Cut Tape) reflect supply chain and assembly process considerations rather than component performance differences.

Frequently Asked Questions (FAQ)

Q: Can the CMF55118K00FHEB be used as a direct replacement for the RNF12FTC118K in all applications?

A: Yes, provided that PCB layout accommodates the physical dimension differences. The CMF55118K00FHEB is electrically and mechanically equivalent across all critical parameters: 118 kOhms ±1%, 0.5W power rating, metal film composition, ±50ppm/°C temperature coefficient, and axial through-hole package type.

Q: What is the significance of the extended operating temperature range in the CMF55118K00FHEB?

A: The CMF55118K00FHEB operates to 175°C versus 155°C for the RNF12FTC118K. This extended range does not affect substitution compatibility and may provide additional margin in high-temperature applications. Applications limited to 155°C maximum will function identically with either part.

Q: Are there physical installation differences between these two axial resistors?

A: Both parts use standard axial through-hole termination with 2 leads. The CMF55118K00FHEB is physically smaller (0.090" Dia x 0.240" L) compared to the RNF12FTC118K (0.108" Dia x 0.344" L). PCB hole spacing and component placement must accommodate these dimensions. The smaller size of the substitute may provide layout advantages in space-constrained designs.

Q: Do packaging format differences (Tape & Reel versus Cut Tape) affect component performance?

A: No. Packaging format reflects supply and assembly logistics only. Electrical and mechanical performance is identical regardless of whether components are supplied on Tape & Reel or Cut Tape.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the RNF12FTC118K and CMF55118K00FHEB are ROHS3 Compliant and REACH Unaffected, meeting current regulatory standards for electronic component manufacturing and use.