FAN4802MY Power Factor Controller IC - Equivalent & Substitute Parts

Part Overview

The FAN4802MY is an average current mode Power Factor Controller IC manufactured by onsemi, designed for power factor correction applications operating at 64kHz switching frequency. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs or production continuity. The FAN4802MY operates across a 11V to 22V supply range and is packaged in a 16-SOIC surface mount configuration with unlimited moisture sensitivity rating.

Substiute Parts

FAN4802MY

onsemiIn Stock: 1719FAN4802MY Datasheet

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UCC3818D

UnitrodeIn Stock: 1606UCC3818D Datasheet

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UCC3818N

Texas InstrumentsIn Stock: 6379UCC3818N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FAN4802MY is determined by the following critical parameters:

Core Functional Requirements:

• Control mode: Average Current (mandatory match)
• Package type: 16-SOIC surface mount configuration (for direct PCB compatibility)
• Supply voltage range: Must encompass or overlap with 11V ~ 22V operating window
• Switching frequency capability: Must support or include 64kHz operation

Compliance & Regulatory:

• REACH Status: REACH Unaffected (maintained across all substitutes)
• ECCN Classification: EAR99 (consistent across all candidates)

The substitute parts UCC3818D and UCC3818N both operate in average current mode with switching frequency ranges that include the 64kHz operating point of the FAN4802MY. However, packaging differences introduce mechanical constraints that must be evaluated for specific applications.

Parameter Comparison

Engineering Selection Recommendations

UCC3818D (Unitrode): This part maintains identical packaging (16-SOIC surface mount) and average current control mode. The switching frequency range of 6kHz to 220kHz encompasses the 64kHz operating point. The supply voltage range of 12V to 17V is narrower than the FAN4802MY (11V ~ 22V), requiring circuit validation for applications requiring operation below 12V or above 17V. Product status is Active, ensuring long-term availability. Operating temperature range is 0°C to 70°C, which is narrower than the FAN4802MY specification.

UCC3818N (Texas Instruments): This part provides average current control with compatible switching frequency range. However, the package is 16-DIP through-hole configuration, which is mechanically incompatible with PCBs designed for 16-SOIC surface mount. This part is suitable only for designs where PCB layout can accommodate through-hole mounting or where a redesign is acceptable. Product status is Last Time Buy, indicating limited future availability. Operating temperature and supply voltage ranges match UCC3818D specifications.

For direct replacement in existing FAN4802MY PCB layouts, UCC3818D is the appropriate selection. For new designs or where PCB redesign is feasible, both parts are functionally equivalent within their specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can UCC3818D be used as a direct drop-in replacement for FAN4802MY?

A: UCC3818D shares the 16-SOIC surface mount package and average current control mode, making it mechanically and functionally compatible for direct PCB substitution. However, the narrower supply voltage range (12V ~ 17V versus 11V ~ 22V) and operating temperature range (0°C ~ 70°C versus -40°C ~ 105°C) must be evaluated against your specific application requirements.

Q: Why is UCC3818N not recommended as a direct replacement?

A: UCC3818N uses a 16-DIP through-hole package, whereas FAN4802MY uses 16-SOIC surface mount. These packages are mechanically incompatible and require different PCB footprints. UCC3818N is suitable only for applications where through-hole mounting is acceptable or where PCB redesign is planned.

Q: What are the key differences in switching frequency between these parts?

A: FAN4802MY operates at a fixed 64kHz switching frequency. Both UCC3818D and UCC3818N support a programmable frequency range of 6kHz to 220kHz, which includes 64kHz operation. This flexibility allows these parts to be configured for the original operating frequency or adjusted for specific application requirements.

Q: Are there supply voltage limitations when substituting with UCC3818D?

A: Yes. FAN4802MY operates from 11V to 22V, while UCC3818D operates from 12V to 17V. Applications requiring operation below 12V or above 17V cannot use UCC3818D without circuit modification. Verify your power supply specifications before selection.

Q: What is the significance of the startup current difference?

A: FAN4802MY has a startup current of 30 µA, while both UCC3818D and UCC3818N require 150 µA. This five-fold increase may impact power consumption during startup phases in low-power or battery-powered applications. Circuit design should account for this difference.

Q: Are all three parts REACH compliant?

A: All three parts carry REACH Unaffected status, indicating they are not subject to REACH restrictions. All maintain EAR99 export classification. Regulatory compliance is consistent across all options.