TOP225Y Equivalent & Substitute Parts Reference

Part Overview

The TOP225Y is an offline switching converter IC manufactured by Power Integrations, designed for isolated power supply applications supporting Boost, Buck, Flyback, and Forward topologies. This device operates at 100kHz switching frequency with 100W power capability and 700V breakdown voltage rating. The TOP225Y is classified as Obsolete, necessitating identification of equivalent substitute components for ongoing design support and production continuity. Substitute parts within the TOPSwitch®-II series maintain functional compatibility while offering alternative power ratings and updated product status classifications.

Substiute Parts

TOP225Y

Power IntegrationsIn Stock: 3011TOP225Y Datasheet

Current PartRFQ

TOP221YN

Power IntegrationsIn Stock: 5612TOP221YN Datasheet

Parametric EquivalentRFQ

TOP222YN

Power IntegrationsIn Stock: 56502TOP222YN Datasheet

Parametric EquivalentRFQ

TOP223YN

Power IntegrationsIn Stock: 25262TOP223YN Datasheet

Parametric EquivalentRFQ

TOP224YN

Power IntegrationsIn Stock: 39324TOP224YN Datasheet

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TOP225YN

Power IntegrationsIn Stock: 8544TOP225YN Datasheet

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TOP226YN

Power IntegrationsIn Stock: 9926TOP226YN Datasheet

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TOP227YN

Power IntegrationsIn Stock: 10455TOP227YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP225Y are selected from the TOPSwitch®-II family based on strict parameter matching across electrical and mechanical specifications. The substitution logic is determined by the following key parameters:

Mandatory Matching Parameters:

• Manufacturer: Power Integrations
• Series: TOPSwitch®-II
• Package / Case: TO-220-3
• Mounting Type: Through Hole
• Voltage - Breakdown: 700V
• Topology: Boost, Buck, Flyback, Forward
• Frequency - Switching: 100kHz
• Duty Cycle: 67%
• Output Isolation: Isolated
• Internal Switch(s): Yes
• Fault Protection: Current Limiting, Over Temperature
• Operating Temperature: -40°C ~ 150°C (TJ)

Variable Parameter (Determines Power Rating):

• Power (Watts): Ranges from 12W to 150W across the substitute family

All substitute parts maintain identical electrical characteristics, thermal operating range, and protection features. Substitution is valid when the application power requirement does not exceed the substitute part's rated power capacity. The TOP225Y 100W rating can be substituted with higher-rated devices (TOP226YN at 125W, TOP227YN at 150W) for applications requiring additional power margin. Lower-rated substitutes (TOP221YN through TOP224YN) are not suitable for 100W applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (100W Applications): TOP225YN is the direct equivalent to TOP225Y, maintaining identical 100W power rating and all electrical specifications. TOP225YN offers improved product status classification (Not For New Designs versus Obsolete) and RoHS Compliant certification, making it the preferred choice for replacement in existing 100W designs.

Higher Power Margin Applications: TOP226YN (125W) and TOP227YN (150W) are suitable substitutes for TOP225Y when additional power headroom is required. These devices maintain all core electrical parameters and thermal characteristics while providing increased power capacity. Selection of higher-rated devices does not compromise performance in 100W applications.

Lower Power Applications: TOP221YN (12W), TOP222YN (25W), TOP223YN (50W), and TOP224YN (75W) are not suitable substitutes for TOP225Y applications due to insufficient power rating. These devices are appropriate only for applications with power requirements at or below their respective ratings.

Compliance Considerations: All substitute parts (TOP221YN through TOP227YN) are RoHS Compliant, whereas the original TOP225Y is RoHS non-compliant. This compliance improvement supports regulatory requirements for new production and procurement cycles. All substitute parts maintain REACH Unaffected status and identical ECCN/HTSUS classifications.

Packaging and Inventory: All substitute parts are supplied in Tube packaging with established inventory availability. TO-220-3 package compatibility ensures direct mechanical substitution without PCB redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can TOP225YN directly replace TOP225Y in existing designs? A: Yes. TOP225YN maintains identical electrical specifications, thermal operating range, package configuration, and power rating (100W). Direct substitution is mechanically and electrically compatible. The primary differences are improved product status and RoHS compliance.

Q: What is the difference between TOP225Y and TOP225YN? A: Both devices share identical core specifications: 100W power rating, 700V breakdown voltage, 100kHz switching frequency, and TO-220-3 package. TOP225Y is classified as Obsolete and RoHS non-compliant, while TOP225YN is classified as Not For New Designs and RoHS Compliant. TOP225YN is the recommended substitute for ongoing production.

Q: Can I use TOP226YN or TOP227YN in place of TOP225Y? A: Yes, for applications requiring 100W or less. TOP226YN (125W) and TOP227YN (150W) provide higher power capacity while maintaining all other electrical and thermal parameters. These substitutes are suitable when additional power margin is beneficial. No circuit modifications are required.

Q: Why are TOP221YN through TOP224YN not suitable substitutes? A: These devices have lower power ratings (12W, 25W, 50W, and 75W respectively) than the TOP225Y (100W). Using an undersized power device in a 100W application results in thermal stress, reduced efficiency, and potential device failure. Substitution is only valid when the substitute power rating meets or exceeds the application requirement.

Q: Are all substitute parts in the same package? A: Yes. All substitute parts (TOP221YN through TOP227YN) use the TO-220-3 package with Through Hole mounting. Direct PCB compatibility is maintained across all substitutes without layout modifications.

Q: What is the inventory status of substitute parts? A: TOP222YN has the highest inventory (56,400 pcs), followed by TOP224YN (39,300 pcs) and TOP223YN (25,200 pcs). TOP225YN (8,475 pcs) and TOP226YN (9,842 pcs) have moderate availability. TOP227YN (10,400 pcs) and TOP221YN (5,525 pcs) have lower stock levels. All parts are listed as New Original In Stock.

Q: Do all substitute parts support the same topologies? A: Yes. All substitute parts support Boost, Buck, Flyback, and Forward topologies with identical 67% duty cycle and 100kHz switching frequency. Topology flexibility is preserved across the entire substitute family.

Q: What are the RoHS compliance implications? A: TOP225Y is RoHS non-compliant, while all substitute parts (TOP221YN through TOP227YN) are RoHS Compliant. For new designs or production cycles subject to RoHS regulations, substitute parts satisfy compliance requirements. Existing inventory of TOP225Y may be used in applications exempt from RoHS requirements.

Q: Are thermal operating ranges identical across all parts? A: Yes. All parts, including TOP225Y and all substitutes, operate across -40°C to 150°C junction temperature range. Thermal management design remains unchanged during substitution.

Q: What protection features are included in substitute parts? A: All substitute parts include Current Limiting and Over Temperature fault protection, identical to TOP225Y. Protection functionality is consistent across the entire TOPSwitch®-II family.