ERO-S2PHF4991 Equivalent & Substitute Parts

Part Overview

The ERO-S2PHF4991 is a 4.99 kOhms ±1% 0.25W through-hole resistor with axial metal film construction manufactured by Panasonic Electronic Components. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The metal film composition and axial package configuration define its primary functional characteristics and determine compatibility with alternative models.

Substiute Parts

ERO-S2PHF4991

Panasonic Electronic ComponentsIn Stock: 880ERO-S2PHF4991 Datasheet

Current PartRFQ

CMF504K9900FHEB

Vishay DaleIn Stock: 6042CMF504K9900FHEB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ERO-S2PHF4991 is determined by strict equivalence across the following critical parameters:

• Resistance value: 4.99 kOhms (exact match required)
• Tolerance: ±1% (defines precision class)
• Power rating: 0.25W, 1/4W (thermal capability)
• Composition: Metal film (electrical performance characteristics)
• Package: Axial through-hole (mechanical and PCB compatibility)
• Temperature coefficient: ±50ppm/°C (stability specification)
• Termination count: 2 (circuit interface requirement)

The CMF504K9900FHEB from Vishay Dale meets all these criteria and qualifies as a direct substitute. Both components share identical electrical specifications and axial package configuration, enabling direct replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The CMF504K9900FHEB is the qualified substitute for the ERO-S2PHF4991 based on the following engineering criteria:

Electrical Equivalence: Both components provide identical resistance, tolerance, power rating, and temperature coefficient specifications. The CMF504K9900FHEB supports an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 150°C), providing additional thermal margin in high-temperature applications.

Product Status: The ERO-S2PHF4991 is obsolete, while the CMF504K9900FHEB is active production. Active status ensures continued availability and supply chain reliability.

Compliance: The CMF504K9900FHEB is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in regulated markets.

Package Compatibility: Both components use identical axial through-hole packaging, enabling direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the CMF504K9900FHEB replace the ERO-S2PHF4991 in existing designs?

A: Yes. Both components share identical electrical specifications (4.99 kOhms ±1%, 0.25W, ±50ppm/°C) and axial package configuration. Direct substitution is possible without circuit redesign or PCB layout changes.

Q: What is the difference in operating temperature range between these parts?

A: The ERO-S2PHF4991 operates from -55°C to 150°C, while the CMF504K9900FHEB operates from -55°C to 175°C. The substitute provides 25°C additional upper temperature capability. For applications within the original -55°C to 150°C range, both components perform identically.

Q: Are there physical dimension differences between the axial packages?

A: Minor dimensional variations exist. The ERO-S2PHF4991 measures 0.067" diameter × 0.126" length (1.70mm × 3.20mm), while the CMF504K9900FHEB measures 0.065" diameter × 0.150" length (1.65mm × 3.81mm). These differences are within standard axial resistor tolerance and do not affect PCB mounting or circuit performance.

Q: What compliance certifications apply to the substitute part?

A: The CMF504K9900FHEB is ROHS3 compliant and REACH unaffected. The original ERO-S2PHF4991 compliance status is not specified in available documentation.

Q: Why is the ERO-S2PHF4991 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The CMF504K9900FHEB, maintained in active production by Vishay Dale, provides continuity for applications requiring this resistance and tolerance specification.