CMF5551R100FKBF Equivalent & Substitute Parts

Part Overview

The CMF5551R100FKBF is a 51.1 Ohm, 1/2W metal film through-hole resistor manufactured by Vishay Dale. This axial component features flame retardant coating and moisture resistance, designed for applications requiring precision resistive elements in through-hole configurations. The part maintains Active product status and is currently in stock with 668 units available. Alternative part numbers may be required due to inventory constraints, supply chain considerations, or specific compliance requirements in target applications.

Substiute Parts

CMF5551R100FKBF

Vishay DaleIn Stock: 746CMF5551R100FKBF Datasheet

Current PartRFQ

CMF5551R100FKEK

Vishay DaleIn Stock: 1163CMF5551R100FKEK Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMF5551R100FKBF is determined by strict equivalence across the following critical parameters:

• Resistance value: 51.1 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 type: Axial through-hole (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Operating temperature range: -55°C to 175°C (exact match required)
• Physical dimensions: 0.090" Dia x 0.240" L (exact match required)

The CMF5551R100FKEK meets all substitution criteria as a parametric equivalent within the CMF series. Both parts share identical electrical specifications, mechanical dimensions, and functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both CMF5551R100FKBF and CMF5551R100FKEK are electrically and mechanically equivalent for applications requiring a 51.1 Ohm, 1/2W metal film axial resistor. Selection between these parts should be based on the following factors:

The CMF5551R100FKEK offers ROHS3 compliance, making it the appropriate choice for applications subject to RoHS3 regulatory requirements. The CMF5551R100FKBF, while RoHS non-compliant, remains suitable for applications without RoHS compliance mandates. Both parts are REACH Affected and classified under ECCN EAR99.

Inventory availability differs between the two parts, with CMF5551R100FKEK currently stocked at 1068 units compared to 668 units for CMF5551R100FKBF. This distinction may influence procurement decisions for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can CMF5551R100FKEK be used as a direct replacement for CMF5551R100FKBF?

A: Yes. Both parts are parametric equivalents with identical resistance, tolerance, power rating, composition, package type, temperature coefficient, operating temperature range, and physical dimensions. Direct substitution is electrically and mechanically valid.

Q: What is the primary difference between these two part numbers?

A: The CMF5551R100FKEK is ROHS3 compliant, while the CMF5551R100FKBF is RoHS non-compliant. All other electrical and mechanical specifications are identical.

Q: Are the physical dimensions identical between both parts?

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

Q: Which part should be selected for RoHS-regulated applications?

A: The CMF5551R100FKEK is the appropriate selection for applications requiring ROHS3 compliance.

Q: Do both parts operate across the same temperature range?

A: Yes. Both parts operate from -55°C to 175°C with a temperature coefficient of ±100ppm/°C.

Q: Are there any functional differences in the flame retardant or moisture-resistant properties?

A: No. Both parts feature identical flame retardant coating and moisture-resistant properties as specified in the CMF series design.