TOP223YN Equivalent & Substitute Parts Reference

Part Overview

The TOP223YN is an offline switching converter IC manufactured by Power Integrations, part of the TOPSwitch®-II series. This device integrates a high-voltage power switch with control circuitry for isolated power supply applications supporting Boost, Buck, Flyback, and Forward topologies. The TOP223YN is classified as "Not For New Designs," indicating it is a legacy product. For new development projects or when TOP223YN availability becomes constrained, equivalent and substitute parts from the TOPSwitch®-II series provide direct functional alternatives with matched electrical and mechanical specifications.

Substiute Parts

TOP223YN

Power IntegrationsIn Stock: 25262TOP223YN Datasheet

Current PartRFQ

TOP243YN

Power IntegrationsIn Stock: 57383TOP243YN Datasheet

SimilarRFQ

TOP221YN

Power IntegrationsIn Stock: 5612TOP221YN Datasheet

Parametric EquivalentRFQ

TOP222YN

Power IntegrationsIn Stock: 56502TOP222YN Datasheet

Parametric EquivalentRFQ

TOP224YN

Power IntegrationsIn Stock: 39324TOP224YN Datasheet

Parametric EquivalentRFQ

TOP225YN

Power IntegrationsIn Stock: 8544TOP225YN Datasheet

Parametric EquivalentRFQ

TOP226YN

Power IntegrationsIn Stock: 9926TOP226YN Datasheet

Parametric EquivalentRFQ

TOP227YN

Power IntegrationsIn Stock: 10455TOP227YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP223YN are selected based on strict electrical and mechanical compatibility criteria. The primary substitution logic is as follows:

Parametric Equivalents (Same Series, Same Package, Same Topology): Parts TOP221YN, TOP222YN, TOP224YN, TOP225YN, TOP226YN, and TOP227YN are all members of the TOPSwitch®-II series with identical TO-220-3 packaging, 700V breakdown voltage, 100kHz switching frequency, 67% duty cycle, and support for Boost, Buck, Flyback, and Forward topologies. These parts differ only in maximum power rating (12W, 25W, 75W, 100W, 125W, and 150W respectively). Substitution between these parts is valid when the application power requirement is within the rated power of the substitute device.

Series-Level Alternative (Different Series, Different Package, Flyback-Only Topology): The TOP243YN represents a different product series (TOPSwitch®-GX) with a different package (TO-220-7C) and different topology support (Flyback only). This part is included as a reference for applications that can operate with Flyback topology exclusively and can accommodate the larger TO-220-7C package footprint.

Key Parameters Determining Substitution:

• Voltage - Breakdown: 700V (fixed across all TOPSwitch®-II equivalents)
• Package / Case: TO-220-3 (fixed for direct pin-compatible substitution)
• Switching Frequency: 100kHz (fixed for TOPSwitch®-II series)
• Topology Support: Boost, Buck, Flyback, Forward (fixed for TOPSwitch®-II series)
• Power Rating: Variable (12W to 150W range)
• Operating Temperature: -40°C ~ 150°C (fixed across all parts)

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Substitution: Select substitute parts from the TOPSwitch®-II series (TOP221YN through TOP227YN) when the application requires identical TO-220-3 package footprint and PCB layout compatibility. These parts maintain the same pinout, voltage rating, switching frequency, and topology support as the TOP223YN. Selection among these parts depends solely on the application's maximum power requirement. The TOP223YN (50W) can be replaced with:

• TOP221YN (12W) for lower-power applications
• TOP222YN (25W) for reduced-power applications
• TOP224YN (75W) for increased-power applications
• TOP225YN (100W) for higher-power applications
• TOP226YN (125W) for maximum-power applications
• TOP227YN (150W) for maximum-power applications

For Legacy Product Transition: All parts in this reference are classified as "Not For New Designs." For new development, consult Power Integrations' current product portfolio for actively supported alternatives. All listed parts maintain RoHS Compliance and REACH Unaffected status, ensuring regulatory alignment for existing designs.

For Alternative Topology or Package Considerations: The TOP243YN (TOPSwitch®-GX series) is provided as a reference for applications that can operate exclusively with Flyback topology and accommodate the larger TO-220-7C package. This part includes additional Over Voltage protection and variable switching frequency (66kHz to 132kHz) compared to the fixed 100kHz of TOPSwitch®-II devices. Package footprint changes require PCB redesign and are not recommended for direct substitution without full circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can TOP223YN be directly replaced with TOP222YN or TOP224YN? A: Yes, within power rating constraints. TOP222YN (25W) is suitable for applications requiring less than 25W output power. TOP224YN (75W) is suitable for applications requiring up to 75W output power. Both maintain identical TO-220-3 pinout, 700V breakdown voltage, 100kHz switching frequency, and topology support (Boost, Buck, Flyback, Forward). No PCB layout changes are required.

Q: What is the difference between TOP223YN and TOP243YN? A: TOP223YN belongs to the TOPSwitch®-II series with TO-220-3 package and supports multiple topologies (Boost, Buck, Flyback, Forward) at 100kHz fixed frequency. TOP243YN belongs to the TOPSwitch®-GX series with TO-220-7C package and supports Flyback topology only with variable frequency (66kHz to 132kHz). TOP243YN includes Over Voltage protection. These parts are not pin-compatible and require different PCB designs.

Q: Can I use TOP225YN (100W) as a direct replacement for TOP223YN (50W)? A: Yes. TOP225YN is pin-compatible with identical electrical specifications except for higher power rating. The application will operate correctly with TOP225YN. However, thermal management design may require adjustment due to increased power dissipation capability.

Q: Are all substitute parts RoHS compliant? A: Yes. All parts listed (TOP221YN through TOP227YN and TOP243YN) are RoHS Compliant with Moisture Sensitivity Level 1 (Unlimited) and REACH Unaffected status.

Q: What happens if I use a lower-power-rated part (e.g., TOP221YN at 12W) in a 50W application? A: The TOP221YN will not operate correctly in a 50W application. The device is rated for maximum 12W output power. Using it in a higher-power application will cause thermal stress, potential device failure, and loss of fault protection effectiveness. Always select a substitute part with power rating equal to or greater than the application requirement.

Q: Is the TOP223YN still available for new orders? A: The TOP223YN is classified as "Not For New Designs" and has 25200 pieces in current inventory. For long-term supply assurance in new designs, contact Power Integrations for actively supported alternatives from current product lines.

Q: Do all TOPSwitch®-II parts operate at the same switching frequency? A: Yes. All TOPSwitch®-II parts (TOP221YN through TOP227YN) operate at a fixed 100kHz switching frequency. The TOP243YN (TOPSwitch®-GX series) operates at variable frequency between 66kHz and 132kHz.

Q: Can I use TOP227YN (150W) in place of TOP223YN (50W) without any circuit modifications? A: Yes, from an electrical and mechanical compatibility standpoint. TOP227YN is pin-compatible with identical voltage, frequency, and topology specifications. However, thermal design considerations may apply due to the higher power rating capability. Verify that the PCB thermal management design is adequate for the application's actual power dissipation.