PKS605PN Equivalent & Substitute Parts

Part Overview

The PKS605PN 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 60 W and 700V breakdown voltage. The device operates at 277kHz switching frequency with 65% duty cycle and includes integrated fault protection for current limiting, overload, and over-temperature conditions.

The PKS605PN is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, design updates, and continued production of equipment utilizing this topology.

Substiute Parts

PKS605PN

Power IntegrationsIn Stock: 2274PKS605PN Datasheet

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TNY277PG

Power IntegrationsIn Stock: 1786TNY277PG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PKS605PN is evaluated based on the following critical parameters that define functional equivalence in offline flyback converter applications:

Primary Compatibility Criteria:

• Manufacturer: Power Integrations (same manufacturer ecosystem)
• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch: Integrated power switch requirement
• Voltage Rating: 700V breakdown voltage
• Package: 8-DIP through-hole form factor
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Control Features: EN (enable) control capability

Secondary Considerations:

• Switching frequency (277kHz for PKS605PN)
• Power rating (60 W for PKS605PN)
• Duty cycle (65% for PKS605PN)
• Fault protection features
• Product status and availability

The TNY277PG qualifies as a substitute based on matching the primary compatibility criteria. However, differences in switching frequency (132kHz vs. 277kHz), power rating (23.5 W vs. 60 W), and fault protection feature set must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

TNY277PG as Substitute for PKS605PN:

The TNY277PG is an active product from Power Integrations' TinySwitch®-III series and qualifies as a functional substitute based on matching core electrical and mechanical parameters: identical 700V breakdown voltage, 8-DIP through-hole package, isolated flyback topology, and -40°C to 150°C operating temperature range.

Key Differences Requiring Application Assessment:

1. Switching Frequency: TNY277PG operates at 132kHz compared to PKS605PN's 277kHz. This lower frequency affects transformer design, EMI characteristics, and component sizing. Applications with frequency-dependent filtering or EMI requirements must validate compatibility.

2. Power Rating: TNY277PG is rated for 23.5 W maximum power versus PKS605PN's 60 W. Applications requiring the full 60 W output cannot use TNY277PG without design modification.

3. Fault Protection: TNY277PG includes additional protection features (open loop, over voltage, short circuit) beyond PKS605PN's feature set. This enhanced protection is compatible with existing designs.

4. Product Status and Compliance: TNY277PG is an active product with RoHS compliance certification, ensuring long-term availability and regulatory alignment for new designs or production continuations.

Substitution Feasibility:

The TNY277PG is suitable for applications where the 23.5 W power limit and 132kHz switching frequency are compatible with system requirements. For applications requiring the full 60 W power capability of the PKS605PN, alternative substitutes from Power Integrations' current product portfolio must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can TNY277PG directly replace PKS605PN in existing PCB designs?

A: Physical package compatibility is confirmed (both 8-DIP through-hole, 7 leads). However, the lower switching frequency (132kHz vs. 277kHz) and reduced power rating (23.5 W vs. 60 W) require validation against your specific application. Transformer design, output filtering, and power delivery requirements must be reassessed.

Q: What is the primary limitation of using TNY277PG as a substitute?

A: The TNY277PG maximum power rating of 23.5 W is significantly lower than the PKS605PN's 60 W rating. Applications requiring full 60 W output cannot use this substitute without design modification or alternative component selection.

Q: Does the switching frequency difference affect circuit design?

A: Yes. The TNY277PG's 132kHz switching frequency versus PKS605PN's 277kHz affects transformer core selection, output filter component values, and EMI performance. Designs optimized for 277kHz operation may require component recalculation for 132kHz operation.

Q: Is TNY277PG RoHS compliant?

A: Yes, TNY277PG is RoHS compliant. The PKS605PN RoHS status is not specified in available documentation. For new designs or production requiring regulatory compliance, TNY277PG provides documented RoHS certification.

Q: What additional fault protection does TNY277PG provide?

A: TNY277PG includes open loop, over voltage, and short circuit protection in addition to current limiting and over temperature protection. These additional features enhance system reliability and do not conflict with existing PKS605PN designs.

Q: Are both parts available from the same manufacturer?

A: Yes, both PKS605PN and TNY277PG are manufactured by Power Integrations. PKS605PN is part of the PeakSwitch® series (obsolete), while TNY277PG is part of the active TinySwitch®-III series.

Q: What is the operating temperature range for TNY277PG?

A: TNY277PG operates across -40°C to 150°C (TJ), matching the PKS605PN temperature specification. Both devices are suitable for industrial and extended temperature applications.

Q: Can I use TNY277PG in a 60 W application by paralleling multiple devices?

A: Paralleling is not recommended without detailed analysis of current sharing, thermal management, and control circuit modifications. Consult Power Integrations application notes for guidance on multi-device configurations.