TOP224Y Equivalent & Substitute Parts Reference

Part Overview

The TOP224Y 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 at 100kHz switching frequency with 75W power rating.

The TOP224Y carries an Obsolete product status. Locating equivalent substitute parts is necessary for design continuity, component availability, and compliance with current manufacturing standards. The substitute parts listed maintain electrical and mechanical compatibility while offering improved availability and updated compliance certifications.

Substiute Parts

TOP224Y

Power IntegrationsIn Stock: 1988TOP224Y Datasheet

Current PartRFQ

TOP224YN

Power IntegrationsIn Stock: 39324TOP224YN Datasheet

DirectRFQ

TOP221YN

Power IntegrationsIn Stock: 5612TOP221YN Datasheet

Parametric EquivalentRFQ

TOP222YN

Power IntegrationsIn Stock: 56502TOP222YN Datasheet

Parametric EquivalentRFQ

TOP223YN

Power IntegrationsIn Stock: 25262TOP223YN 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 TOP224Y are selected based on strict electrical and mechanical parameter compatibility within the TOPSwitch®-II product family. The substitution logic is determined by the following key parameters:

Critical Compatibility Parameters:

• Package / Case: TO-220-3 (all substitutes maintain identical through-hole package)
• Voltage - Breakdown: 700V (all substitutes maintain identical voltage rating)
• Topology: Boost, Buck, Flyback, Forward (all substitutes support identical topologies)
• Frequency - Switching: 100kHz (all substitutes operate at identical switching frequency)
• Duty Cycle: 67% (all substitutes maintain identical duty cycle)
• Output Isolation: Isolated (all substitutes provide isolated output)
• Fault Protection: Current Limiting, Over Temperature (all substitutes include identical protection features)
• Operating Temperature: -40°C ~ 150°C (TJ) (all substitutes maintain identical temperature range)

Variable Parameter:

• Power (Watts): The TOP224Y is rated at 75W. Substitute parts are available in different power ratings (12W, 25W, 50W, 75W, 100W, 125W, 150W) within the same series, allowing selection based on application power requirements.

All substitute parts are manufactured by Power Integrations and belong to the TOPSwitch®-II series. Substitutes with higher power ratings (TOP225YN, TOP226YN, TOP227YN) can replace the TOP224Y in applications where additional power headroom is required. Substitutes with lower power ratings (TOP221YN, TOP222YN, TOP223YN) are suitable for applications with reduced power demands.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Identical Power Rating):

TOP224YN is the direct equivalent to TOP224Y, maintaining the 75W power rating and all electrical specifications. TOP224YN offers improved compliance status with RoHS Compliant certification compared to the non-compliant TOP224Y. Selection of TOP224YN is appropriate for applications requiring exact power specification match and updated regulatory compliance.

Power-Scaled Alternatives:

For applications where power requirements differ from 75W, the following substitutes within the TOPSwitch®-II series provide equivalent electrical and mechanical compatibility:

• TOP221YN (12W): For low-power applications
• TOP222YN (25W): For applications requiring 25W capacity
• TOP223YN (50W): For applications requiring 50W capacity
• TOP225YN (100W): For applications requiring 100W capacity or higher power margin
• TOP226YN (125W): For applications requiring 125W capacity
• TOP227YN (150W): For applications requiring 150W capacity

All substitute parts listed carry "Not For New Designs" status and RoHS Compliant certification, indicating they are established products with current manufacturing support and regulatory compliance suitable for production environments.

Compliance Considerations:

The TOP224Y is RoHS non-compliant. All substitute parts (TOP224YN, TOP221YN, TOP222YN, TOP223YN, TOP225YN, TOP226YN, TOP227YN) are RoHS Compliant. Selection of RoHS Compliant substitutes is required for applications subject to RoHS regulations or customer requirements mandating RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can TOP224YN directly replace TOP224Y in existing designs?

A: Yes. TOP224YN maintains identical electrical specifications (75W power rating, 700V breakdown voltage, 100kHz switching frequency, 67% duty cycle, isolated output) and mechanical compatibility (TO-220-3 package, through-hole mounting). The primary difference is improved RoHS compliance status. No circuit modifications are required.

Q: What is the difference between TOP224Y and TOP224YN?

A: Both parts are 75W TOPSwitch®-II converters with identical electrical and mechanical specifications. The primary difference is RoHS compliance status: TOP224Y is RoHS non-compliant (Obsolete), while TOP224YN is RoHS Compliant (Not For New Designs). TOP224YN also offers superior component availability.

Q: Can I use a higher-power substitute like TOP225YN (100W) instead of TOP224Y (75W)?

A: Yes. TOP225YN maintains all critical electrical parameters (700V breakdown, 100kHz switching, 67% duty cycle, isolated output, identical topology support) and mechanical compatibility (TO-220-3 package). The higher power rating provides additional design margin. No circuit modifications are required for electrical compatibility, though thermal design considerations may apply.

Q: Can I use a lower-power substitute like TOP223YN (50W) instead of TOP224Y (75W)?

A: TOP223YN maintains all critical electrical parameters and mechanical compatibility. However, the 50W rating is below the TOP224Y specification. Selection of lower-power substitutes is appropriate only if application power requirements are confirmed to be 50W or less. Using an undersized power rating may result in thermal stress or component failure.

Q: Are all substitute parts in the same TO-220-3 package?

A: Yes. All substitute parts listed (TOP221YN through TOP227YN) use identical TO-220-3 through-hole packaging. Direct mechanical substitution is possible without PCB layout modifications.

Q: What is the significance of "Not For New Designs" status on substitute parts?

A: "Not For New Designs" indicates the part is in mature production with established supply chains and manufacturing processes, but Power Integrations recommends evaluating newer product families for new design starts. For replacement or continuation of existing designs, these parts provide stable, supported alternatives with current compliance certifications.

Q: Do all substitute parts support the same topologies as TOP224Y?

A: Yes. All substitute parts support identical topologies: Boost, Buck, Flyback, and Forward. Topology selection is independent of power rating within the TOPSwitch®-II series.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts maintain the identical operating temperature range of -40°C to 150°C (junction temperature). Thermal design considerations remain consistent across the substitution family.