PKS604YN Equivalent & Substitute Parts

Part Overview

The PKS604YN is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device operates in the PeakSwitch® series and features a 700V breakdown voltage with 56W power handling capability in a TO-220-7C package configuration.

The PKS604YN is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing design requirements, system maintenance, and production continuity where this component is specified in existing applications.

Substiute Parts

PKS604YN

Power IntegrationsIn Stock: 778PKS604YN Datasheet

Current PartRFQ

TOP254YN

Power IntegrationsIn Stock: 4304TOP254YN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PKS604YN is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 700V rating
• Package / Case: TO-220-7 Formed Leads, 6 Leads
• Mounting Type: Through Hole
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Internal Switch(s): Integrated switching element

Allowable Variation Parameters:

• Power (Watts): Substitute must meet or exceed 56W specification
• Frequency - Switching: May differ from 277kHz
• Duty Cycle: May differ from 65%
• Fault Protection: May include additional protection features
• Product Status: Active status preferred for obsolete parts
• Series: Different series acceptable if all mandatory parameters align

The TOP254YN meets all mandatory matching criteria and qualifies as a direct substitute for the PKS604YN.

Parameter Comparison

Engineering Selection Recommendations

TOP254YN as Substitute for PKS604YN:

The TOP254YN is qualified as a direct substitute based on the following engineering criteria:

1. Electrical Compatibility: All mandatory electrical parameters align with the PKS604YN specification. The 700V breakdown voltage, isolated flyback topology, and TO-220-7C package ensure pin-compatible operation in existing circuit designs.

2. Power Capability: The TOP254YN delivers 62W, exceeding the PKS604YN's 56W specification. This provides additional design margin for power delivery applications.

3. Product Status: The TOP254YN holds Active status with 4200 units in stock, providing immediate availability and long-term supply continuity compared to the obsolete PKS604YN.

4. Compliance Certification: The TOP254YN is RoHS Compliant, meeting current environmental and regulatory standards. Both parts maintain REACH Unaffected status and EAR99 export classification.

5. Temperature Rating: Identical operating temperature range (-40°C ~ 150°C TJ) ensures thermal performance equivalence across all operating conditions.

6. Fault Protection: The TOP254YN includes Over Voltage protection in addition to Current Limiting and Over Temperature protection, providing enhanced system reliability.

Design Considerations:

Switching frequency variation (277kHz vs. 66kHz/132kHz) and duty cycle difference (65% vs. 78%) require transformer and filter component evaluation in the specific application circuit. These parameters affect magnetic core selection, output filtering, and EMI characteristics. Circuit validation is necessary to confirm performance equivalence in the target application.

Frequently Asked Questions (FAQ)

Q: Can the TOP254YN directly replace the PKS604YN without PCB modifications?

A: The TOP254YN is pin-compatible with the PKS604YN in the TO-220-7C package configuration. However, the switching frequency difference (277kHz vs. 66kHz/132kHz) may require transformer and filter component adjustments to maintain equivalent output voltage regulation and EMI performance. PCB layout remains compatible; component value changes may be necessary.

Q: What is the significance of the switching frequency difference between these parts?

A: The PKS604YN operates at 277kHz while the TOP254YN operates at 66kHz or 132kHz. Lower switching frequency typically results in larger transformer core and output filter components but may reduce switching losses. Higher frequency enables smaller magnetics but increases switching losses. The specific application circuit determines whether this trade-off is acceptable.

Q: Are there any compliance or certification differences between PKS604YN and TOP254YN?

A: The TOP254YN is RoHS Compliant, while the PKS604YN does not specify RoHS status. Both parts are REACH Unaffected and classified as EAR99 for export purposes. The TOP254YN's RoHS compliance aligns with current environmental regulations and may be required for new designs or applications with regulatory requirements.

Q: What is the inventory status difference, and why does it matter?

A: The PKS604YN has 746 units in stock but is classified as obsolete, indicating no future production. The TOP254YN has 4200 units in stock and is Active status, ensuring long-term availability and supply chain continuity. For production applications, the TOP254YN provides superior supply security.

Q: How do the fault protection features differ?

A: The PKS604YN provides Current Limiting, Over Load, and Over Temperature protection. The TOP254YN provides Current Limiting, Over Temperature, and Over Voltage protection. The TOP254YN's Over Voltage protection offers additional system safeguarding, while the PKS604YN's Over Load protection is replaced by Over Voltage monitoring in the substitute.

Q: Is the duty cycle difference (65% vs. 78%) a concern for substitution?

A: Duty cycle variation affects transformer design and output voltage regulation characteristics. The 13% difference requires evaluation of the specific application circuit to confirm that output voltage regulation, load response, and transient performance remain within specification. Transformer turns ratio adjustment may be necessary.

Q: What packaging format is the TOP254YN supplied in?

A: The TOP254YN is supplied in Tube packaging, while the PKS604YN packaging format is not specified. Both use identical TO-220-7C component packaging for PCB mounting. The Tube format is standard for active production components and does not affect circuit performance.