TOP227YN Equivalent & Substitute Parts Reference

Part Overview

The TOP227YN 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 150W power handling capability in a TO-220-3 package.

The TOP227YN carries a "Not For New Designs" product status. This designation indicates the part remains available for existing applications and maintenance but is not recommended for new circuit development. Engineers working with legacy systems or requiring direct replacements for existing designs must identify functionally equivalent alternatives from the current product portfolio or compatible parts within the TOPSwitch®-II series.

Substiute Parts

TOP227YN

Power IntegrationsIn Stock: 10455TOP227YN Datasheet

Current PartRFQ

TOP247YN

Power IntegrationsIn Stock: 34266TOP247YN Datasheet

SimilarRFQ

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

Parametric EquivalentRFQ

TOP225YN

Power IntegrationsIn Stock: 8544TOP225YN Datasheet

Parametric EquivalentRFQ

TOP226YN

Power IntegrationsIn Stock: 9926TOP226YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP227YN is determined by strict alignment of electrical and mechanical parameters within the TOPSwitch®-II product family. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

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

Variable Parameter (Power Rating): The power rating in watts is the primary differentiating parameter among TOPSwitch®-II TO-220-3 variants. Parts with different power ratings remain mechanically and electrically compatible when all other parameters align, allowing selection based on application power requirements.

Substitute Parts within TOPSwitch®-II Series:

• TOP221YN (12W)
• TOP222YN (25W)
• TOP223YN (50W)
• TOP224YN (75W)
• TOP225YN (100W)
• TOP226YN (125W)

All listed parts share identical electrical characteristics, package configuration, and protection features with the TOP227YN, differing only in rated power output.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (150W Applications): The TOP227YN is the specified component for 150W power applications. No direct equivalent exists within the TOPSwitch®-II series at this exact power rating. Designs currently using TOP227YN should continue with this part number for existing production unless design modification is undertaken.

For Power Scaling (Alternative Power Requirements): Applications requiring different power outputs may select from the TOPSwitch®-II family based on actual power demand:

• Applications requiring ≤125W may use TOP226YN (125W) as the highest-rated alternative below TOP227YN
• Applications requiring <100W may use TOP225YN (100W)
• Lower power applications may select TOP224YN (75W), TOP223YN (50W), TOP222YN (25W), or TOP221YN (12W)

All substitutions maintain identical electrical performance characteristics, package compatibility, and compliance certifications.

Compliance and Regulatory Status: All parts in this family carry RoHS Compliant status, REACH Unaffected designation, and Moisture Sensitivity Level 1 (Unlimited). These certifications remain consistent across all substitute options, ensuring regulatory compliance is maintained during part selection.

Product Status Consideration: All parts listed carry "Not For New Designs" status. This designation applies uniformly across the TOPSwitch®-II series. For new circuit development, evaluation of current-generation Power Integrations offline converter families is recommended.

Frequently Asked Questions (FAQ)

Q: Can TOP226YN (125W) be used as a direct replacement for TOP227YN (150W)?

A: TOP226YN shares all electrical and mechanical parameters with TOP227YN except power rating. Direct substitution is mechanically and electrically feasible only if the application power requirement does not exceed 125W. For applications requiring the full 150W capability, TOP226YN is not suitable.

Q: Are all TOPSwitch®-II TO-220-3 parts pin-compatible?

A: Yes. All parts listed (TOP221YN through TOP226YN) use identical TO-220-3 package configuration with three leads. Pin assignments and lead functions are identical across the series, enabling direct PCB compatibility.

Q: What is the primary difference between TOP227YN and other TOPSwitch®-II variants?

A: The power rating is the primary differentiating parameter. TOP227YN is rated for 150W output, while other variants range from 12W to 125W. All other electrical specifications, including switching frequency (100kHz), topology support, voltage breakdown (700V), duty cycle (67%), and protection features remain identical.

Q: Can TOP227YN be substituted with TOP247YN?

A: No. TOP247YN belongs to the TOPSwitch®-GX series and uses a TO-220-7C package with six leads, differing fundamentally from TOP227YN's TO-220-3 three-lead configuration. Additionally, TOP247YN supports only Flyback topology with variable switching frequency (66kHz ~ 132kHz), whereas TOP227YN supports multiple topologies at fixed 100kHz frequency. These parts are not interchangeable.

Q: What inventory availability should be considered when selecting a substitute?

A: Current inventory levels are: TOP227YN (10,400 pcs), TOP226YN (9,842 pcs), TOP225YN (8,475 pcs), TOP224YN (39,300 pcs), TOP223YN (25,200 pcs), TOP222YN (56,400 pcs), and TOP221YN (5,525 pcs). Inventory status may influence procurement decisions for high-volume applications.

Q: Are there any control feature differences among TOPSwitch®-II variants?

A: No. All TOPSwitch®-II TO-220-3 variants listed have identical control features (none specified in the parameter set). Control functionality is uniform across the series.

Q: What thermal considerations apply when selecting among power-rated variants?

A: All variants operate within the identical temperature range (-40°C ~ 150°C junction temperature). Higher-power variants (TOP226YN, TOP227YN) may generate proportionally higher heat dissipation in the same package. Thermal design must account for the specific power rating of the selected part.