ML4800CP PFC Controller - Equivalent & Substitute Parts

Part Overview

The ML4800CP is a Power Factor Correction (PFC) controller IC manufactured by onsemi, designed for average current mode operation at 76kHz switching frequency in a 16-PDIP through-hole package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. Identifying equivalent substitute parts is necessary to ensure supply chain continuity and support ongoing production requirements for legacy systems or to transition designs to actively supported alternatives.

Substiute Parts

ML4800CP

onsemiIn Stock: 9371ML4800CP Datasheet

Current PartRFQ

FAN4800AUN

onsemiIn Stock: 35236FAN4800AUN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ML4800CP is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Functional Mode: Average Current PFC controller operation
• Package Type: 16-DIP (0.300", 7.62mm) through-hole configuration
• Manufacturer: onsemi (same product family)
• Pin Configuration: Electrical and mechanical compatibility with 16-PDIP footprint

Allowable Parameter Variations:

• Switching Frequency: Higher frequencies are acceptable (76kHz baseline to 240kHz ~ 268kHz)
• Supply Voltage Range: Extended ranges are acceptable (11V ~ 16.5V baseline to 11V ~ 22V)
• Startup Current: Lower values are acceptable (200 µA baseline to 30 µA)
• Operating Temperature: Extended ranges are acceptable (0°C ~ 70°C baseline to -40°C ~ 105°C)
• Product Status: Active status preferred over obsolete for new supply assurance

The FAN4800AUN meets all mandatory compatibility criteria and demonstrates improved electrical specifications across multiple parameters.

Parameter Comparison

Engineering Selection Recommendations

For Continued Support of Existing Designs: The FAN4800AUN is the direct substitute for ML4800CP applications. Both components share identical functional mode (average current PFC control), package configuration (16-DIP through-hole), and manufacturer origin (onsemi). The FAN4800AUN provides superior supply chain status as an active product with current inventory availability (35,200 pcs), compared to the obsolete ML4800CP status.

Compliance and Certification Advantages: The FAN4800AUN carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Both parts maintain REACH Unaffected status. The substitute's extended operating temperature range (-40°C ~ 105°C) and expanded supply voltage window (11V ~ 22V) provide design flexibility for applications requiring broader environmental or power supply specifications.

Electrical Performance Considerations: The FAN4800AUN operates at higher switching frequency (240kHz ~ 268kHz versus 76kHz) with reduced startup current (30 µA versus 200 µA). These characteristics result in improved efficiency and reduced inrush current during power-up sequences. The higher switching frequency may require circuit board layout optimization to manage electromagnetic interference, but the identical pin configuration and package footprint ensure mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can FAN4800AUN be used as a direct replacement for ML4800CP without circuit modifications?

A: Yes. Both components are 16-PDIP through-hole packages with identical pin configurations and average current PFC control functionality. No circuit modifications are required for mechanical or electrical compatibility. However, the higher switching frequency of FAN4800AUN may require evaluation of EMI filtering and board layout to ensure performance meets application requirements.

Q: What is the primary reason for substituting ML4800CP?

A: ML4800CP is classified as obsolete with discontinued production. FAN4800AUN is an active product from the same manufacturer with current inventory availability, ensuring long-term supply chain support for production requirements.

Q: Are there any compliance differences between ML4800CP and FAN4800AUN?

A: FAN4800AUN carries ROHS3 compliance certification, meeting current environmental regulations. ML4800CP compliance status is not specified. Both parts maintain REACH Unaffected status. For applications subject to RoHS requirements, FAN4800AUN is the compliant choice.

Q: How does the higher switching frequency of FAN4800AUN affect circuit design?

A: FAN4800AUN operates at 240kHz ~ 268kHz compared to ML4800CP at 76kHz. Higher switching frequency reduces transformer and filter component sizes but increases electromagnetic emissions. Circuit board layout should incorporate appropriate shielding and filtering to manage EMI. The identical pin configuration allows direct substitution without redesign.

Q: What are the startup current differences, and do they impact power supply design?

A: FAN4800AUN draws 30 µA startup current versus 200 µA for ML4800CP. The lower startup current reduces inrush current and power dissipation during initialization, improving overall system efficiency and reducing stress on auxiliary power supply circuits.

Q: Is the extended operating temperature range of FAN4800AUN beneficial for all applications?

A: FAN4800AUN supports -40°C ~ 105°C operation versus ML4800CP at 0°C ~ 70°C. The extended range is beneficial for industrial, automotive, or outdoor applications requiring operation in extreme temperature environments. For standard commercial applications within 0°C ~ 70°C, both specifications are equivalent.

Q: Can ML4800CP and FAN4800AUN be mixed in the same production batch?

A: Both components are pin-compatible and functionally equivalent for average current PFC control. However, the different switching frequencies and electrical characteristics may result in variations in circuit performance. Consistency within a production batch is recommended to ensure uniform system behavior and compliance with performance specifications.