PKS604FN Equivalent & Substitute Parts

Part Overview

The PKS604FN is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This component operates at 277kHz switching frequency with 56W power handling capability in a TO-262-7C package configuration. The PKS604FN is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across isolation topology, voltage ratings, power capacity, and thermal operating range to ensure direct replacement capability.

Substiute Parts

PKS604FN

Power IntegrationsIn Stock: 2273PKS604FN Datasheet

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TOP254YN

Power IntegrationsIn Stock: 4304TOP254YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the PKS604FN are identified based on the following critical parameters that define functional equivalence:

Primary Compatibility Criteria:

• Topology classification: Flyback converter architecture
• Output isolation: Isolated configuration
• Voltage rating: 700V breakdown voltage minimum
• Power capacity: Minimum 56W handling capability
• Internal switching element: Integrated switch required
• Thermal range: -40°C to 150°C junction temperature support
• Fault protection: Current limiting and over-temperature protection as minimum requirements
• Mounting: Through-hole package configuration

The TOP254YN qualifies as a substitute based on matching all primary compatibility criteria. While package form factor differs (TO-220-7C versus TO-262-7C), both are through-hole mounted configurations with equivalent lead counts and electrical interface compatibility.

Parameter Comparison

Engineering Selection Recommendations

PKS604FN Status: Obsolete product with 2200 units in current inventory. This component is no longer in active production.

TOP254YN Status: Active product with 4200 units in current inventory. This component is actively manufactured and supported by Power Integrations.

Compliance and Certification:

• Both components carry identical REACH status (REACH Unaffected)
• Both components carry identical ECCN classification (EAR99)
• Both components carry identical HTSUS code (8542.39.0001)
• TOP254YN includes RoHS Compliant certification
• Both components have MSL rating of 1 (Unlimited)

Selection Basis: The TOP254YN represents the active substitute for the obsolete PKS604FN. Selection of TOP254YN is supported by: identical 700V breakdown voltage, identical -40°C to 150°C thermal operating range, identical isolated flyback topology, identical through-hole mounting method, and active manufacturing status with established supply chain availability. The TOP254YN exceeds the 56W power requirement at 62W capacity and provides enhanced over-voltage protection in addition to current limiting and over-temperature protection.

Frequently Asked Questions (FAQ)

Q: Can TOP254YN directly replace PKS604FN in existing PCB designs?

A: Package form factor differs between components. PKS604FN uses TO-262-7 package while TOP254YN uses TO-220-7 package. Both are through-hole configurations with 6 leads, but physical footprint and pin spacing differ. PCB layout modification is required for direct substitution.

Q: What are the key electrical differences between PKS604FN and TOP254YN?

A: Both components share identical 700V breakdown voltage, identical -40°C to 150°C thermal range, and identical isolated flyback topology. Switching frequency differs (277kHz for PKS604FN versus 66kHz/132kHz for TOP254YN). Duty cycle differs (65% for PKS604FN versus 78% for TOP254YN). Power capacity differs (56W for PKS604FN versus 62W for TOP254YN).

Q: Why is PKS604FN classified as obsolete?

A: Product status reflects Power Integrations' discontinuation of the PeakSwitch® series in favor of the active TOPSwitch®-HX series. The TOP254YN represents the current generation equivalent within Power Integrations' product portfolio.

Q: Are there any compliance or certification differences between these components?

A: Both components carry identical REACH status, ECCN classification, and HTSUS codes. TOP254YN includes RoHS Compliant certification. Both components have MSL rating of 1 (Unlimited).

Q: What is the impact of different switching frequencies on circuit design?

A: Switching frequency affects transformer design, output filter component selection, and EMI characteristics. The 277kHz frequency of PKS604FN versus 66kHz/132kHz of TOP254YN requires recalculation of magnetic component specifications and filter design parameters.

Q: Can TOP254YN be used in new designs instead of PKS604FN?

A: Yes. TOP254YN is the active product with established supply chain availability. New designs should specify TOP254YN rather than the obsolete PKS604FN to ensure long-term component availability and manufacturing support.