CMF55249K00FLEK Equivalent & Substitute Parts

Part Overview

The CMF55249K00FLEK is a 249 kOhm ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration. This component is manufactured by Vishay Dale and maintains active product status with 1083 units currently in stock. The resistor features flame retardant coating and moisture-resistant construction suitable for industrial and commercial applications requiring stable resistance values across extended temperature ranges.

Substitute parts become necessary when the primary part reaches end-of-life status, inventory depletion, or when design requirements permit selection from qualified alternatives meeting identical electrical and mechanical specifications.

Substiute Parts

CMF55249K00FLEK

Vishay DaleIn Stock: 1158CMF55249K00FLEK Datasheet

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CMF55249K00FHEK

Vishay DaleIn Stock: 1000CMF55249K00FHEK Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMF55249K00FLEK is determined by strict equivalence across the following parameters:

• Resistance value: 249 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 0.5W / 1/2W (exact match required)
• Composition: Metal Film (exact match required)
• Package: Axial through-hole (exact match required)
• Operating temperature range: -55°C to 175°C (minimum requirement)
• Physical dimensions: 0.090" Dia × 0.240" L (exact match required)
• Termination count: 2 (exact match required)

The identified substitute CMF55249K00FHEK meets all mandatory electrical and mechanical parameters. This part differs only in temperature coefficient specification (±50ppm/°C versus ±150ppm/°C on the main part), representing improved thermal stability while maintaining functional equivalence for circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The CMF55249K00FLEK remains the primary selection for new designs due to active product status and adequate inventory availability. Both the main part and substitute CMF55249K00FHEK maintain ROHS3 compliance and identical mechanical compatibility, ensuring direct board-level interchangeability without layout modifications.

Selection of the substitute CMF55249K00FHEK is appropriate when the main part becomes unavailable, provided that the improved temperature coefficient (±50ppm/°C) aligns with circuit tolerance requirements. The substitute's lower temperature coefficient may provide enhanced performance stability in temperature-sensitive applications.

The discontinued status of CMF55249K00FHEK at DiGi Electronics indicates reduced long-term availability; this substitute should be considered a transitional option rather than a permanent alternative for ongoing production requirements.

Frequently Asked Questions (FAQ)

Q: Can CMF55249K00FHEK be used as a direct replacement for CMF55249K00FLEK?

A: Yes. Both parts share identical resistance (249 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), package type (axial), and physical dimensions. The substitute features improved temperature coefficient performance (±50ppm/°C versus ±150ppm/°C).

Q: What is the significance of the temperature coefficient difference?

A: Temperature coefficient defines resistance change per degree Celsius. The substitute's ±50ppm/°C specification indicates lower resistance drift across temperature variations compared to the main part's ±150ppm/°C. This represents a performance improvement for applications requiring tighter resistance stability.

Q: Are there any compliance or certification differences?

A: Both parts maintain ROHS3 compliance. The main part carries REACH Affected status while the substitute is REACH Unaffected. Both are classified under ECCN EAR99 and HTSUS 8533.21.0090.

Q: What is the impact of the substitute's discontinued status?

A: Discontinued status at DiGi Electronics indicates reduced availability through this distribution channel. Inventory of 949 units remains available; however, long-term sourcing should prioritize the active CMF55249K00FLEK for production continuity.

Q: Are physical dimensions identical between both parts?

A: Yes. Both parts measure 0.090" diameter × 0.240" length (2.29mm × 6.10mm) in axial configuration, ensuring identical PCB footprint and mounting compatibility.

Q: Can these parts be used interchangeably in existing assemblies?

A: Yes. Identical electrical specifications (resistance, tolerance, power rating) and mechanical dimensions (package, size) permit direct substitution without circuit redesign or board layout modification.