RNF14FAC137K Equivalent & Substitute Parts

Part Overview

The RNF14FAC137K is a 137 kOhms ±1% metal film axial resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This through-hole component features flame retardant coating and safety-grade construction, designed for applications requiring precision resistance values with tight tolerance specifications. The part maintains active product status with 946 units in current inventory. Substitute parts are identified when equivalent electrical performance can be maintained while accommodating different power ratings, packaging formats, or enhanced environmental specifications.

Substiute Parts

RNF14FAC137K

Stackpole Electronics IncIn Stock: 995RNF14FAC137K Datasheet

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CMF55137K00FHEB

Vishay DaleIn Stock: 2517CMF55137K00FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The CMF55137K00FHEB qualifies as a substitute based on the following electrical and mechanical equivalencies:

Matching Parameters:

• Resistance value: 137 kOhms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Temperature coefficient: ±50ppm/°C (identical)
• Package type: Axial (identical)
• RoHS compliance: ROHS3 Compliant (identical)

Allowable Differences:

• Power rating: 0.5W (1/2W) versus 0.25W (1/4W) — higher power rating provides enhanced thermal capability
• Operating temperature range: -55°C ~ 175°C versus -55°C ~ 155°C — extended upper temperature limit
• Physical dimensions: Slight variation in diameter and length within axial package specifications
• Packaging format: Cut Tape (CT) versus Tape & Box (TB)
• Additional feature: Moisture resistant coating (enhancement)

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (RNF14FAC137K): Select the RNF14FAC137K when the application circuit design specifies a 0.25W (1/4W) power dissipation budget and the operating temperature range does not exceed 155°C. This part maintains ROHS3 compliance and active product status.

Substitute Selection (CMF55137K00FHEB): The CMF55137K00FHEB serves as a direct substitute when:

• Circuit design permits a higher power rating (0.5W) without adverse effects
• Operating environment may reach temperatures up to 175°C
• Moisture-resistant coating provides additional environmental protection
• Higher inventory availability (2428 units) supports production scheduling
• Packaging format (Cut Tape) aligns with assembly line requirements

Both parts maintain identical electrical specifications (137 kOhms ±1%, ±50ppm/°C) and meet ROHS3 compliance requirements. Physical dimensions are compatible with standard axial resistor footprints.

Frequently Asked Questions (FAQ)

Q: Can CMF55137K00FHEB replace RNF14FAC137K in any application?

A: The CMF55137K00FHEB provides electrical equivalence (137 kOhms ±1%, ±50ppm/°C) and is compatible with standard axial resistor PCB layouts. The higher power rating (0.5W versus 0.25W) and extended temperature range (-55°C ~ 175°C) present no functional limitations in applications designed for the RNF14FAC137K. Verify that your circuit board assembly process accommodates the slightly smaller physical dimensions (0.090" Dia x 0.240" L).

Q: What is the significance of the ±1% tolerance specification?

A: The ±1% tolerance indicates that the actual resistance value will not deviate more than 1% from the nominal 137 kOhms specification. Both the main part and substitute maintain this tolerance, ensuring consistent circuit performance across production batches.

Q: How do the power ratings affect component selection?

A: Power rating determines the maximum continuous power dissipation the resistor can handle without exceeding temperature limits. The CMF55137K00FHEB's 0.5W rating provides greater thermal margin than the RNF14FAC137K's 0.25W rating. If your circuit dissipates less than 0.25W through this resistor, both parts are functionally equivalent.

Q: Are there packaging considerations when switching between these parts?

A: The RNF14FAC137K ships in Tape & Box (TB) format, while the CMF55137K00FHEB uses Cut Tape (CT) packaging. Both are compatible with standard axial resistor pick-and-place equipment. Verify your assembly line's tape handling specifications before transitioning between packaging formats.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RNF14FAC137K and CMF55137K00FHEB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. They share identical HTSUS coding (8533.21.0090).