ML4800CSX Equivalent & Substitute Parts

Part Overview

The ML4800CSX is a Power Factor Correction (PFC) controller IC manufactured by onsemi, designed for average current mode operation at 76kHz switching frequency in a 16-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The ML4800CSX operates within a supply voltage range of 11V to 16.5V and is suitable for applications requiring PFC functionality in industrial and consumer power supply designs.

Substiute Parts

ML4800CSX

onsemiIn Stock: 20919ML4800CSX 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 eligibility for the ML4800CSX is determined by the following critical parameters:

Primary Compatibility Criteria:

• Functional mode: Average Current PFC control
• Package type: 16-SOIC surface mount configuration
• Pin count and pinout compatibility: 16 pins
• Supply voltage overlap: Minimum 11V compatibility required
• Operating temperature range: Must support at least 0°C to 70°C

Secondary Considerations:

• Switching frequency: While the ML4800CSX operates at 76kHz, substitute parts with higher switching frequencies (240kHz–268kHz or 250kHz) remain functionally compatible in average current mode PFC applications, as the control topology remains consistent
• Startup current: Variations in startup current do not prevent substitution but may affect circuit behavior during power-up transients
• Supply voltage range: Substitute parts with extended voltage ranges provide broader application flexibility

The two identified substitute parts—FAN4800AUM and UCC3819AD—meet all primary compatibility criteria and share the same average current PFC control architecture and 16-SOIC packaging as the ML4800CSX.

Parameter Comparison

Engineering Selection Recommendations

FAN4800AUM (onsemi): This part is the preferred substitute for new designs and production continuity. It maintains onsemi manufacturer lineage with the ML4800CSX, operates in active product status, and provides extended supply voltage range (11V–22V) and operating temperature range (-40°C to 105°C). The higher switching frequency (240kHz–268kHz) reduces passive component size in PFC stage designs. RoHS3 compliance is confirmed. MSL rating of 3 requires standard moisture control during storage and assembly.

UCC3819AD (Texas Instruments): This part is suitable for applications where cross-manufacturer substitution is acceptable. It maintains the same operating temperature range as the ML4800CSX (0°C–70°C) and offers MSL 1 (unlimited) moisture sensitivity. However, the product status is Last Time Buy, indicating limited future availability. Supply voltage range (10.8V–17V) provides adequate overlap with the ML4800CSX specification. RoHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can FAN4800AUM be used as a direct replacement for ML4800CSX? A: Yes. Both devices share identical 16-SOIC packaging, average current PFC control mode, and overlapping supply voltage specifications. The higher switching frequency of FAN4800AUM does not prevent substitution in average current mode topologies. PCB layout and component values may require optimization for the different switching frequency.

Q: What is the impact of switching frequency differences between ML4800CSX (76kHz) and substitute parts? A: Switching frequency affects the size and cost of passive components (inductors and capacitors) in the PFC stage. Higher frequencies (240kHz–268kHz for FAN4800AUM, 250kHz for UCC3819AD) allow smaller passive components but may increase switching losses. The control architecture remains functionally identical across all three parts.

Q: Are there supply voltage compatibility concerns? A: The ML4800CSX operates at 11V–16.5V. FAN4800AUM extends this to 11V–22V, and UCC3819AD covers 10.8V–17V. Both substitutes are compatible with the ML4800CSX supply voltage range. Applications requiring voltages above 16.5V should use FAN4800AUM.

Q: What are the packaging and mounting considerations? A: All three parts use identical 16-SOIC surface mount packaging (0.154" width, 3.90mm). No PCB layout changes are required for package compatibility. Existing footprints and assembly processes remain unchanged.

Q: How do startup current differences affect circuit design? A: Startup current variations (200 µA for ML4800CSX, 30 µA for FAN4800AUM, 150 µA for UCC3819AD) influence the bias resistor network design. Lower startup current (FAN4800AUM) allows higher bias resistor values, reducing quiescent power consumption. Circuit redesign may be beneficial but is not mandatory for substitution.

Q: What is the significance of product status (Obsolete, Active, Last Time Buy)? A: ML4800CSX is obsolete and no longer manufactured. FAN4800AUM is active and recommended for new designs. UCC3819AD is Last Time Buy, indicating limited remaining inventory and no future production. For long-term production, FAN4800AUM is the preferred choice.

Q: Are there compliance or certification differences? A: All three parts are REACH Unaffected and classified as EAR99. FAN4800AUM and UCC3819AD are RoHS3 compliant. MSL ratings differ: ML4800CSX and UCC3819AD are MSL 1 (unlimited), while FAN4800AUM is MSL 3 (168 hours), requiring standard moisture control during storage.