CMF554R9900FKBF Equivalent & Substitute Parts

Part Overview

The CMF554R9900FKBF is a 4.99 Ohm, 1/2W metal film axial through-hole resistor manufactured by Vishay Dale. This component is classified as Active product status and features flame retardant coating with moisture resistance properties. Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate varying inventory availability across distribution channels.

Substiute Parts

CMF554R9900FKBF

Vishay DaleIn Stock: 842CMF554R9900FKBF Datasheet

Current PartRFQ

CMF554R9900FKEK

Vishay DaleIn Stock: 3213CMF554R9900FKEK Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMF554R9900FKBF is determined by strict equivalence across the following critical parameters:

• Resistance value: 4.99 Ohms
• Tolerance: ±1%
• Power rating: 0.5W (1/2W)
• Composition: Metal Film
• Package type: Axial
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C to 175°C
• Physical dimensions: 0.090" Dia x 0.240" L (2.29mm x 6.10mm)
• Number of terminations: 2

The substitute part CMF554R9900FKEK meets all these parameters identically, establishing it as a parametric equivalent within the CMF series.

Parameter Comparison

Engineering Selection Recommendations

Both CMF554R9900FKBF and CMF554R9900FKEK are parametrically identical and functionally interchangeable for circuit applications requiring 4.99 Ohm, 1/2W metal film axial resistors with ±1% tolerance and -55°C to 175°C operating range.

The CMF554R9900FKEK offers improved regulatory compliance status: it is ROHS3 Compliant and REACH Unaffected, compared to the CMF554R9900FKBF which is RoHS non-compliant and REACH Affected. For applications subject to environmental or regulatory requirements, the CMF554R9900FKEK is the preferred selection. The CMF554R9900FKEK also maintains higher inventory availability at 3176 pieces compared to 830 pieces for the CMF554R9900FKBF.

Frequently Asked Questions (FAQ)

Q: Are CMF554R9900FKBF and CMF554R9900FKEK electrically identical?

A: Yes. Both parts share identical electrical specifications: 4.99 Ohms resistance, ±1% tolerance, 0.5W power rating, ±100ppm/°C temperature coefficient, and -55°C to 175°C operating temperature range. They are parametric equivalents.

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

A: The primary differences are regulatory compliance and inventory levels. CMF554R9900FKEK is ROHS3 Compliant and REACH Unaffected, while CMF554R9900FKBF is RoHS non-compliant and REACH Affected. CMF554R9900FKEK has higher stock availability.

Q: Can I substitute CMF554R9900FKEK for CMF554R9900FKBF in my design?

A: Yes. Both parts are mechanically and electrically interchangeable. They share identical package type (Axial), physical dimensions (0.090" Dia x 0.240" L), and all electrical parameters. Substitution is direct.

Q: Are there any packaging or handling differences?

A: Both parts are supplied in Bulk packaging and have identical physical dimensions and termination configuration (2 terminations). No handling or installation differences exist.

Q: Which part should I specify for new designs?

A: For new designs, CMF554R9900FKEK is recommended due to superior regulatory compliance status (ROHS3 Compliant, REACH Unaffected) and higher inventory availability.