FAN4800ASMY Equivalent & Substitute Parts

Part Overview

The FAN4800ASMY is a Power Factor Correction (PFC) controller IC manufactured by onsemi, designed for average current mode operation at 240kHz to 268kHz switching frequency. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The FAN4800ASMY operates across a 11V to 26V supply voltage range and is housed in a 16-SOIC surface mount package.

Substiute Parts

FAN4800ASMY

onsemiIn Stock: 7709FAN4800ASMY Datasheet

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FAN4800AUM

onsemiIn Stock: 17747FAN4800AUM Datasheet

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UCC3819AD

Texas InstrumentsIn Stock: 1448UCC3819AD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the FAN4800ASMY is determined by the following critical parameters:

• Control Mode: Average Current mode operation
• Switching Frequency: 240kHz to 268kHz range
• Package Type: 16-SOIC form factor
• Supply Voltage Range: Compatibility with 11V to 26V input
• Startup Current: Maximum 30 µA specification
• Operating Temperature Range: -40°C to 105°C capability

Two substitute parts meet these criteria with varying degrees of parameter alignment:

FAN4800AUM (onsemi): Identical control mode and switching frequency, same package, active product status. Supply voltage range is 11V to 22V, which is a subset of the original specification.

UCC3819AD (Texas Instruments): Identical control mode and package. Switching frequency is 250kHz (within the original 240kHz-268kHz range). Supply voltage range is 10.8V to 17V. Operating temperature range is 0°C to 70°C, which is narrower than the original specification.

Parameter Comparison

Engineering Selection Recommendations

FAN4800AUM is the primary substitute for the FAN4800ASMY. Both devices are manufactured by onsemi with identical control mode, switching frequency, and operating temperature specifications. The FAN4800AUM is currently in active production status, ensuring long-term availability. The supply voltage range of 11V to 22V is a subset of the original 11V to 26V specification; applications requiring operation above 22V cannot use this substitute. The FAN4800AUM carries ROHS3 compliance certification.

UCC3819AD is a secondary substitute manufactured by Texas Instruments. This device operates at 250kHz, which falls within the original 240kHz to 268kHz switching frequency window. However, the UCC3819AD has a narrower supply voltage range (10.8V to 17V) and operating temperature range (0°C to 70°C) compared to the original specification. The startup current is 150 µA, significantly higher than the original 30 µA specification. The UCC3819AD is classified as Last Time Buy, indicating limited future availability. This device is ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can FAN4800AUM directly replace FAN4800ASMY in all applications?

A: FAN4800AUM is a direct substitute for applications operating within the 11V to 22V supply voltage range. Applications requiring operation above 22V require evaluation of alternative solutions.

Q: What are the key differences between FAN4800AUM and UCC3819AD?

A: FAN4800AUM maintains identical switching frequency and startup current specifications as the original FAN4800ASMY. UCC3819AD has a higher startup current (150 µA vs. 30 µA) and narrower operating temperature range (0°C to 70°C vs. -40°C to 105°C). Both devices operate in average current mode and use the 16-SOIC package.

Q: Is the 16-SOIC package identical across all three parts?

A: Yes. All three parts use the 16-SOIC package with 0.154" width and 3.90mm dimensions, enabling direct PCB footprint compatibility.

Q: What is the significance of the UCC3819AD Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this product. Existing inventory may be available, but future procurement cannot be guaranteed. Long-term designs should prioritize FAN4800AUM.

Q: Are there compliance differences between the substitute parts?

A: FAN4800AUM and UCC3819AD are both ROHS3 compliant. Both devices carry REACH Unaffected status and EAR99 export classification, matching the original FAN4800ASMY specifications.