PKS604PN Equivalent & Substitute Parts

Part Overview

The PKS604PN is an offline switch flyback converter IC manufactured by Power Integrations, part of the PeakSwitch® series. This 8-DIP through-hole component integrates an internal power switch for isolated flyback topology applications with a maximum power rating of 56 W and 700V breakdown voltage. The device operates at 277kHz switching frequency with integrated current limiting, overload, and over-temperature protection.

The PKS604PN is classified as obsolete. Identifying equivalent substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity for applications currently utilizing this component.

Substiute Parts

PKS604PN

Power IntegrationsIn Stock: 3123PKS604PN Datasheet

Current PartRFQ

TNY277PG

Power IntegrationsIn Stock: 1786TNY277PG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PKS604PN is determined by the following critical parameters:

Mandatory Matching Parameters:

• Manufacturer: Power Integrations
• Topology: Flyback
• Output Isolation: Isolated
• Internal Switch(s): Yes
• Voltage - Breakdown: 700V
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Mounting Type: Through Hole
• Operating Temperature Range: -40°C ~ 150°C (TJ)

Allowable Variation Parameters:

• Frequency - Switching: May differ (277kHz vs. 132kHz acceptable)
• Power (Watts): May differ (56W vs. 23.5W acceptable for lower-power applications)
• Fault Protection: May include additional protection features
• Product Status: Active status preferred for new designs; obsolete acceptable for legacy support

The TNY277PG meets all mandatory matching parameters and represents a valid substitute within the Power Integrations offline switch flyback product family.

Parameter Comparison

Engineering Selection Recommendations

For Legacy System Maintenance: The TNY277PG is suitable as a direct substitute for PKS604PN in through-hole PCB applications where the original component is no longer available. Both devices share identical package geometry, pin configuration, and core electrical characteristics (700V breakdown, 65% duty cycle, -40°C to 150°C operating range).

Power Rating Consideration: The TNY277PG is rated for 23.5 W maximum power output, compared to the PKS604PN's 56 W rating. Substitution is appropriate only for applications operating within the TNY277PG's power envelope. Applications requiring the full 56 W capacity of the original PKS604PN require alternative solutions outside this substitute relationship.

Switching Frequency Difference: The TNY277PG operates at 132kHz versus the PKS604PN's 277kHz. This lower switching frequency may affect transformer design, EMI characteristics, and component selection in the power stage. Circuit redesign may be necessary to accommodate this parameter difference.

Product Status and Support: The TNY277PG holds active product status with RoHS compliance certification, ensuring ongoing manufacturer support, documentation availability, and supply chain continuity. The PKS604PN's obsolete status makes the TNY277PG the recommended path for new designs and long-term system support.

Compliance and Certifications: Both devices carry identical REACH status (REACH Unaffected) and ECCN classification (EAR99). The TNY277PG's RoHS compliance provides additional regulatory advantage for applications subject to RoHS requirements.

Frequently Asked Questions (FAQ)

Q: Can TNY277PG replace PKS604PN in any application?

A: TNY277PG is pin-compatible and electrically compatible for applications within its 23.5 W power rating. Applications requiring the full 56 W capacity of PKS604PN require alternative solutions. Circuit redesign may be necessary due to the 277kHz to 132kHz frequency difference.

Q: What is the primary difference between these two parts?

A: The TNY277PG operates at lower switching frequency (132kHz vs. 277kHz) and lower maximum power rating (23.5 W vs. 56 W). The TNY277PG includes additional fault protection features (open loop, over voltage, short circuit) and holds active product status with RoHS compliance.

Q: Are the packages physically identical?

A: Yes. Both devices use 8-DIP (0.300", 7.62mm) through-hole packages with 7 leads. PCB footprints are identical, and no layout modifications are required for package compatibility.

Q: Does TNY277PG require different circuit design?

A: The lower switching frequency (132kHz) may require transformer and filter component recalculation. Consult Power Integrations design documentation for the TNY277PG to ensure proper circuit implementation.

Q: Is TNY277PG suitable for new designs?

A: Yes. TNY277PG holds active product status and includes RoHS compliance, making it the appropriate choice for new designs requiring offline switch flyback topology with 700V breakdown voltage and isolated output.

Q: What compliance certifications apply to both parts?

A: Both devices are REACH Unaffected and classified as EAR99 for export control purposes. TNY277PG additionally carries RoHS Compliant certification.

Q: Can I use TNY277PG in a 56 W application?

A: No. TNY277PG is rated for maximum 23.5 W output power. Using it in a 56 W application exceeds its power rating and violates device specifications.