CMF55121K00FKBF Equivalent & Substitute Parts

Part Overview

The CMF55121K00FKBF is a 121 kOhms ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration. Manufactured by Vishay Dale, this component features flame retardant coating and moisture resistance suitable for industrial and commercial applications. The part is currently active in production. Substitute parts may be required due to inventory availability, regional sourcing constraints, or compliance requirement updates.

Substiute Parts

CMF55121K00FKBF

Vishay DaleIn Stock: 887CMF55121K00FKBF Datasheet

Current PartRFQ

CMF55121K00FKEK

Vishay DaleIn Stock: 1749CMF55121K00FKEK Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMF55121K00FKBF is determined by the following critical parameters:

• Resistance value: 121 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)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Operating temperature range: -55°C to 175°C (exact match required)
• Physical dimensions: 0.090" Dia × 0.240" L (exact match required)

The CMF55121K00FKEK meets all substitution criteria as a parametric equivalent within the CMF55 series from Vishay Dale.

Parameter Comparison

Engineering Selection Recommendations

Both CMF55121K00FKBF and CMF55121K00FKEK are functionally equivalent for circuit applications requiring a 121 kOhms ±1% metal film resistor at 0.5W power dissipation. The primary distinction is regulatory compliance: CMF55121K00FKEK carries ROHS3 compliance certification, while CMF55121K00FKBF is RoHS non-compliant. Selection between these parts should be based on applicable regulatory requirements in the target market or application. Both parts maintain identical electrical performance, thermal characteristics, and physical form factor. Inventory availability may also influence part selection, as CMF55121K00FKEK currently has higher stock levels (1656 pcs vs. 841 pcs).

Frequently Asked Questions (FAQ)

Q: Can CMF55121K00FKEK be used as a direct replacement for CMF55121K00FKBF?

A: Yes. Both parts are parametric equivalents with identical resistance, tolerance, power rating, temperature coefficient, operating temperature range, and physical dimensions. They are mechanically and electrically interchangeable in circuit applications.

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

A: The primary difference is RoHS compliance status. CMF55121K00FKEK is ROHS3 compliant, while CMF55121K00FKBF is RoHS non-compliant. All electrical and mechanical specifications are identical.

Q: Are there any package or form factor differences?

A: No. Both parts use identical axial through-hole packaging with 0.090" diameter and 0.240" length (2.29mm × 6.10mm). They are pin-compatible and occupy the same PCB footprint.

Q: Which part should I select for new designs?

A: Selection depends on regulatory requirements. For applications requiring RoHS3 compliance, use CMF55121K00FKEK. For applications without RoHS compliance mandates, either part is acceptable based on availability and sourcing preferences.

Q: Do these parts have identical temperature performance?

A: Yes. Both parts share the same temperature coefficient of ±100ppm/°C and identical operating temperature range of -55°C to 175°C.