TOP222Y Equivalent & Substitute Parts Reference

Part Overview

The TOP222Y is an offline switched-mode power supply controller manufactured by Power Integrations, part of the TOPSwitch®-II series. This integrated circuit functions as a converter supporting multiple topologies including Boost, Buck, Flyback, and Forward configurations with isolated output. The device operates at 100kHz switching frequency and delivers 25W power output with integrated current limiting and over-temperature fault protection.

The TOP222Y carries an Obsolete product status. Identifying equivalent and substitute parts is necessary for design continuity, procurement planning, and system reliability when the original component becomes unavailable through standard distribution channels.

Key Parameters

Parameter	Value
Manufacturer Part Number	TOP222Y
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
Power (Watts)	25 W
Duty Cycle	67%
Fault Protection	Current Limiting, Over Temperature
Output Isolation	Isolated
Operating Temperature	-40°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TOP222Y is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Package / Case: TO-220-3 (physical compatibility with PCB footprint and thermal management)
Mounting Type: Through Hole (assembly process compatibility)
Voltage - Breakdown: 700V (electrical stress rating)
Topology Support: Boost, Buck, Flyback, Forward (functional capability)
Frequency - Switching: 100kHz (circuit timing and EMI characteristics)
Duty Cycle: 67% (control characteristic)
Fault Protection: Current Limiting, Over Temperature (safety feature set)
Output Isolation: Isolated (system architecture requirement)
Operating Temperature: -40°C ~ 150°C (TJ) (thermal operating range)

All substitute parts listed below maintain identical values for these critical parameters. The primary differentiator among substitute parts is the Power (Watts) rating, which determines the maximum output power capability. Selection of a substitute part with equal or greater power rating ensures functional compatibility while maintaining all electrical and mechanical specifications.

Parameter Comparison

Part Number	Power (Watts)	Package	Voltage - Breakdown	Frequency - Switching	Duty Cycle	Operating Temperature	Product Status	RoHS Status
TOP222Y	25 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Obsolete	RoHS non-compliant
TOP221YN	12 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant
TOP222YN	25 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant
TOP223YN	50 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant
TOP224YN	75 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant
TOP225YN	100 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant
TOP226YN	125 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant
TOP227YN	150 W	TO-220-3	700V	100kHz	67%	-40°C ~ 150°C	Not For New Designs	RoHS Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended for Existing Designs):

TOP222YN is the direct equivalent to TOP222Y, maintaining identical power rating (25W) and all critical electrical parameters. The primary distinction is packaging format (Tube vs. standard) and RoHS compliance status (RoHS Compliant vs. non-compliant). TOP222YN is suitable for direct substitution in existing designs where the 25W power specification is required.

Higher Power Alternatives (For Design Flexibility):

Parts TOP223YN (50W), TOP224YN (75W), TOP225YN (100W), TOP226YN (125W), and TOP227YN (150W) provide equivalent electrical and mechanical compatibility with increased power handling capability. These parts maintain all critical parameters including package, topology support, switching frequency, and operating temperature range. Selection of a higher-rated part accommodates future design margin or system expansion without requiring circuit topology changes.

Lower Power Alternative (For Cost Optimization):

TOP221YN (12W) provides equivalent electrical and mechanical compatibility with reduced power rating. This part is suitable only for applications where the 25W specification exceeds actual system requirements, as it cannot support the full power envelope of the original TOP222Y design.

Product Status Consideration:

All substitute parts carry "Not For New Designs" status, indicating these components are in mature lifecycle phases. For new product development, consultation with Power Integrations regarding current-generation alternatives is recommended. For existing production or maintenance applications, the listed substitutes provide functional continuity.

Compliance Consideration:

TOP222Y is RoHS non-compliant. All substitute parts listed (TOP221YN through TOP227YN) are RoHS Compliant, providing regulatory advantage for systems subject to RoHS requirements. This compliance improvement is a secondary benefit of substitution.

Frequently Asked Questions (FAQ)

Q: Can TOP222YN directly replace TOP222Y in existing designs?

A: Yes. TOP222YN maintains identical electrical specifications (25W power, 700V breakdown voltage, 100kHz switching frequency, 67% duty cycle, isolated output, TO-220-3 package, through-hole mounting) and identical operating temperature range (-40°C to 150°C). The primary differences are packaging format and RoHS compliance status. No circuit modifications are required.

Q: What is the difference between TOP222Y and TOP222YN?

A: Both parts are identical in electrical function and performance. TOP222Y is supplied in standard packaging and is RoHS non-compliant. TOP222YN is supplied in Tube packaging and is RoHS Compliant. The "YN" suffix indicates the newer variant with improved compliance status.

Q: Can I use TOP223YN (50W) instead of TOP222Y (25W)?

A: Yes. TOP223YN provides all electrical and mechanical compatibility with the TOP222Y while offering double the power rating. This substitution is valid for applications where the original 25W specification is met or exceeded by the system design. The higher power rating provides additional design margin without requiring circuit modifications.

Q: Why is TOP221YN (12W) listed as a substitute if it has lower power rating?

A: TOP221YN is listed as a parametric equivalent because it maintains all critical electrical and mechanical parameters. However, it is suitable only for applications where actual power requirements are 12W or less. It cannot support designs requiring the full 25W capability of TOP222Y.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use TO-220-3 package with through-hole mounting. PCB footprint compatibility is maintained across all listed parts.

Q: What does "Not For New Designs" status mean?

A: This status indicates the component is in mature or end-of-life phase. Existing designs using these parts can continue production. For new product development, Power Integrations recommends evaluating current-generation alternatives. For maintenance and repair of existing systems, these parts remain functionally valid.

Q: Are there any thermal or mounting differences between substitute parts?

A: No. All substitute parts maintain identical operating temperature range (-40°C to 150°C junction temperature) and identical TO-220-3 through-hole mounting configuration. Thermal management and PCB layout considerations remain unchanged across all listed parts.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance is a material composition specification that does not alter electrical function or performance characteristics. All RoHS Compliant substitutes (TOP221YN through TOP227YN) deliver identical electrical performance to the non-compliant TOP222Y.

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