TOP222YN Equivalent & Substitute Parts Reference

Part Overview

The TOP222YN 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 TOP222YN is classified as "Not For New Designs," indicating it is a legacy product. For new applications or when TOP222YN inventory becomes unavailable, equivalent and substitute parts within the TOPSwitch®-II and TOPSwitch®-GX series provide functional alternatives with varying power ratings and package configurations.

Substiute Parts

TOP222YN

Power IntegrationsIn Stock: 56502TOP222YN Datasheet

Current PartRFQ

TOP242YN

Power IntegrationsIn Stock: 3740TOP242YN Datasheet

SimilarRFQ

TOP221YN

Power IntegrationsIn Stock: 5612TOP221YN Datasheet

Parametric EquivalentRFQ

TOP223YN

Power IntegrationsIn Stock: 25262TOP223YN 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

Substitution of the TOP222YN is determined by the following critical parameters:

Primary Substitution Criteria:

• Package Compatibility: TO-220-3 form factor with Through Hole mounting
• Voltage Rating: 700V breakdown voltage
• Topology Support: Boost, Buck, Flyback, Forward capability
• Switching Frequency: 100kHz operation
• Duty Cycle: 67% maximum
• Isolation: Isolated output configuration
• Temperature Range: -40°C to 150°C (TJ)
• Compliance: RoHS Compliant, MSL 1

Parametric Equivalent Parts (Same Package, Same Topology, Different Power Ratings):

The TOP221YN, TOP223YN, TOP224YN, TOP225YN, TOP226YN, and TOP227YN are direct parametric equivalents within the TOPSwitch®-II series. These parts share identical package (TO-220-3), voltage rating (700V), topology support (Boost, Buck, Flyback, Forward), switching frequency (100kHz), duty cycle (67%), and operating temperature range. The primary differentiator is output power rating, ranging from 12W to 150W.

Cross-Series Alternative (Different Package, Different Topology Limitation):

The TOP242YN represents a cross-series alternative from the TOPSwitch®-GX series. While it maintains 700V breakdown voltage, isolated output, and Through Hole mounting, it differs in package configuration (TO-220-7C vs. TO-220-3), supports only Flyback topology (not Boost, Buck, or Forward), operates at variable switching frequency (66kHz ~ 132kHz with frequency control), and provides enhanced fault protection (includes Over Voltage protection). Power rating is 22W.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same PCB Layout, Same Topology Requirements):

Select from TOP221YN, TOP223YN, TOP224YN, TOP225YN, TOP226YN, or TOP227YN based on required output power. All maintain TO-220-3 package compatibility, identical electrical characteristics (700V, 100kHz, 67% duty cycle, Boost/Buck/Flyback/Forward topology support), and equivalent compliance certifications (RoHS Compliant, MSL 1). Power rating selection depends on application requirements:

• TOP221YN: 12W applications
• TOP222YN: 25W applications (original specification)
• TOP223YN: 50W applications
• TOP224YN: 75W applications
• TOP225YN: 100W applications
• TOP226YN: 125W applications
• TOP227YN: 150W applications

For Cross-Series Migration (Flyback-Only Topologies):

The TOP242YN (TOPSwitch®-GX series) is applicable only when the application topology is limited to Flyback configuration. This substitution requires PCB redesign due to TO-220-7C package (6 leads vs. 3 leads). The TOP242YN provides enhanced fault protection (Over Voltage protection in addition to Current Limiting and Over Temperature) and variable switching frequency control (66kHz ~ 132kHz). Power rating is 22W.

Compliance and Regulatory Considerations:

All listed parts maintain RoHS Compliance, MSL 1 (Unlimited moisture sensitivity), and equivalent REACH/ECCN/HTSUS classifications. All parts are classified as "Not For New Designs," indicating legacy product status. For new design initiatives, consult Power Integrations current product portfolio for actively supported alternatives.

Frequently Asked Questions (FAQ)

Q1: Can TOP221YN replace TOP222YN in an existing design?

A: TOP221YN is a parametric equivalent with identical package (TO-220-3), voltage rating (700V), topology support (Boost, Buck, Flyback, Forward), switching frequency (100kHz), and operating temperature range (-40°C to 150°C). The primary difference is power rating: TOP221YN is rated 12W versus TOP222YN at 25W. Substitution is valid only if the application power requirement does not exceed 12W. No PCB modifications are required.

Q2: What is the difference between TOP222YN and TOP242YN?

A: TOP222YN (TOPSwitch®-II) and TOP242YN (TOPSwitch®-GX) differ in multiple parameters. TOP222YN uses TO-220-3 package with 3 leads; TOP242YN uses TO-220-7C package with 6 leads, requiring PCB redesign. TOP222YN supports Boost, Buck, Flyback, and Forward topologies; TOP242YN supports Flyback only. TOP222YN operates at fixed 100kHz; TOP242YN operates at variable 66kHz ~ 132kHz with frequency control. TOP242YN includes Over Voltage protection in addition to Current Limiting and Over Temperature protection. Power ratings differ: 25W (TOP222YN) versus 22W (TOP242YN).

Q3: Are all substitute parts RoHS compliant?

A: Yes. All listed parts (TOP221YN, TOP223YN, TOP224YN, TOP225YN, TOP226YN, TOP227YN, and TOP242YN) are RoHS Compliant with MSL 1 (Unlimited moisture sensitivity). Compliance certifications are equivalent across all parts.

Q4: Can I use TOP225YN (100W) in place of TOP222YN (25W)?

A: TOP225YN is a parametric equivalent with identical package, voltage rating, topology support, switching frequency, and operating temperature. Electrical substitution is valid. However, TOP225YN is rated for higher power output (100W vs. 25W). In applications requiring only 25W, TOP225YN will operate within specification but represents component oversizing. Design considerations such as thermal management, PCB layout, and cost may influence this decision.

Q5: What happens if I use TOP242YN in a Buck topology application?

A: TOP242YN supports Flyback topology only. It cannot be used in Buck, Boost, or Forward topology applications. Substitution is restricted to Flyback-only designs. Additionally, TOP242YN requires PCB redesign due to different package configuration (TO-220-7C vs. TO-220-3).

Q6: Are there pin-compatible alternatives to TOP222YN?

A: Yes. TOP221YN, TOP223YN, TOP224YN, TOP225YN, TOP226YN, and TOP227YN are all pin-compatible, sharing the TO-220-3 package with identical pinout. These parts can be substituted without PCB modifications. TOP242YN is not pin-compatible due to TO-220-7C package configuration.

Q7: What is the inventory status of substitute parts?

A: Current inventory levels are: TOP221YN (5,525 pcs), TOP223YN (25,200 pcs), TOP224YN (39,300 pcs), TOP225YN (8,475 pcs), TOP226YN (9,842 pcs), TOP227YN (10,400 pcs), and TOP242YN (3,633 pcs). TOP222YN has 56,400 pcs in stock.

Q8: Why are all these parts marked "Not For New Designs"?

A: Product status "Not For New Designs" indicates these are legacy components. While they remain available and fully functional, Power Integrations recommends evaluating current-generation alternatives for new applications. Existing designs using these parts can continue to source and use them for maintenance and production.