RNF12FTC124K Equivalent & Substitute Parts

Part Overview

The RNF12FTC124K is a 124 kOhms ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction suitable for industrial and consumer applications requiring precision resistance values with tight tolerance specifications. The part maintains Active product status with 1065 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

RNF12FTC124K

Stackpole Electronics IncIn Stock: 1109RNF12FTC124K Datasheet

Current PartRFQ

CMF55124K00FHEB

Vishay DaleIn Stock: 1639CMF55124K00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC124K is determined by the following critical parameters:

• Resistance value must equal 124 kOhms
• Tolerance must be ±1% or tighter
• Power rating must be 0.5W (1/2W) or greater
• Composition must be metal film
• Package configuration must be axial through-hole
• Temperature coefficient must be ±50ppm/°C or better
• Operating temperature range must encompass or exceed -55°C ~ 155°C
• Features must include flame retardant coating and safety designation
• RoHS3 compliance is required

The CMF55124K00FHEB from Vishay Dale meets all substitution criteria across these parameters, establishing it as a qualified equivalent part.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC124K and CMF55124K00FHEB maintain Active product status with current manufacturing availability. Selection between these parts is based on the following engineering considerations:

The RNF12FTC124K provides the specified baseline performance with established supply chain presence (1065 units in stock). The CMF55124K00FHEB from Vishay Dale offers equivalent electrical performance with an extended operating temperature range to 175°C and additional moisture resistance features, supported by 1602 units in current inventory. Both components satisfy ROHS3 compliance and REACH unaffected status requirements.

Physical dimension differences exist between the two parts. The CMF55124K00FHEB features a smaller diameter (0.090" vs 0.108") and shorter length (0.240" vs 0.344"), which may influence PCB layout and mechanical clearance considerations in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can CMF55124K00FHEB be used as a direct replacement for RNF12FTC124K?

A: Yes. Both parts share identical resistance value (124 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), package type (axial), and temperature coefficient (±50ppm/°C). Both are ROHS3 compliant with flame retardant and safety features. The CMF55124K00FHEB operates across a wider temperature range (-55°C ~ 175°C vs -55°C ~ 155°C) and includes moisture resistance.

Q: Are there physical compatibility concerns when substituting these parts?

A: Physical dimensions differ between the two parts. The CMF55124K00FHEB is smaller (0.090" Dia x 0.240" L) compared to the RNF12FTC124K (0.108" Dia x 0.344" L). In most applications, the smaller substitute will fit existing PCB layouts designed for the larger original part. However, applications with tight mechanical constraints or specific lead spacing requirements should verify physical fit before implementation.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the RNF12FTC124K and CMF55124K00FHEB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS coding (8533.21.0090).

Q: What is the difference in packaging format between these parts?

A: The RNF12FTC124K is supplied in Tape & Reel (TR) format, while the CMF55124K00FHEB is supplied in Cut Tape (CT) format. Both formats are standard for through-hole resistor distribution and do not affect electrical or mechanical performance.

Q: Which part should be selected for applications requiring extended temperature operation?

A: The CMF55124K00FHEB supports operation to 175°C, providing a 20°C margin above the RNF12FTC124K specification of 155°C. For applications operating near or above 155°C, the CMF55124K00FHEB is the appropriate selection.