TOP224YN Equivalent & Substitute Parts Reference

Part Overview

The TOP224YN 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 TOP224YN operates at 100kHz switching frequency with 75W power capability and is housed in a TO-220-3 through-hole package.

The TOP224YN 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. Identifying equivalent and substitute parts from the TOPSwitch®-II series becomes necessary for design flexibility, inventory management, and long-term supply chain planning.

Substiute Parts

TOP224YN

Power IntegrationsIn Stock: 39324TOP224YN Datasheet

Current PartRFQ

TOP244YN

Power IntegrationsIn Stock: 3712TOP244YN 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

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 TOP224YN is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

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

Variable Parameter (Power Rating): The power rating in watts is the primary differentiator among TOPSwitch®-II devices. Substitutes within the same series maintain identical electrical characteristics and package specifications but differ in maximum power handling capability. The TOP224YN at 75W can be substituted with parts rated at 12W, 25W, 50W, 100W, 125W, or 150W depending on application requirements.

Cross-Series Consideration: The TOP244YN represents a different product series (TOPSwitch®-GX) with different package configuration (TO-220-7C), switching frequency range (66kHz ~ 132kHz), and topology limitation (Flyback only). This part is listed as a similar alternative but does not meet the strict substitution criteria for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution Within TOPSwitch®-II Series:

Parts TOP221YN, TOP222YN, TOP223YN, TOP225YN, TOP226YN, and TOP227YN are direct substitutes for the TOP224YN. All maintain identical electrical specifications, package configuration, and compliance certifications. Selection among these parts depends solely on the required power output rating for the target application.

Power Rating Selection Logic:

• TOP221YN (12W): Applications requiring minimal power output
• TOP222YN (25W): Low-power isolated converter applications
• TOP223YN (50W): Mid-range power requirements
• TOP224YN (75W): Reference part, mid-to-high power applications
• TOP225YN (100W): High-power isolated converter applications
• TOP226YN (125W): Extended power capability
• TOP227YN (150W): Maximum power within TOPSwitch®-II series

All TOPSwitch®-II variants carry identical "Not For New Designs" product status, RoHS compliance, and MSL rating. Thermal management and PCB layout considerations remain consistent across the series due to identical package geometry.

Cross-Series Consideration:

The TOP244YN (TOPSwitch®-GX series) is not a direct substitute. This part operates in a different product family with distinct electrical characteristics: different switching frequency range (66kHz ~ 132kHz versus fixed 100kHz), different duty cycle (66.5% versus 67%), different package (TO-220-7C versus TO-220-3), and topology limitation to Flyback only. Use TOP244YN only when TOPSwitch®-GX series specifications are explicitly required.

Frequently Asked Questions (FAQ)

Q: Can TOP221YN replace TOP224YN in an existing design?

A: TOP221YN is electrically compatible with TOP224YN in terms of package, topology support, switching frequency, and protection features. However, TOP221YN is rated for 12W maximum output versus TOP224YN's 75W. Substitution is valid only if the application power requirement does not exceed 12W. Exceeding this rating will cause thermal stress and potential device failure.

Q: What is the difference between TOP224YN and TOP244YN?

A: TOP224YN belongs to the TOPSwitch®-II series with fixed 100kHz operation, supports multiple topologies (Boost, Buck, Flyback, Forward), and uses TO-220-3 package. TOP244YN belongs to TOPSwitch®-GX series with variable frequency (66kHz ~ 132kHz), supports Flyback topology only, and uses TO-220-7C package with six leads. These are not interchangeable without circuit redesign.

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

A: Yes. All TOPSwitch®-II parts (TOP221YN through TOP227YN) share identical TO-220-3 package configuration with three leads. Pin assignments and functional connections are identical across the series. PCB layout and component placement require no modification when substituting between these parts.

Q: Can TOP225YN (100W) be used in place of TOP224YN (75W)?

A: Yes. TOP225YN is a direct substitute with higher power rating. All electrical parameters, package specifications, and protection features are identical. Using a higher-rated device in a lower-power application introduces no functional risk. Thermal dissipation will be lower than the device's maximum capability.

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

A: This status indicates the part family remains in production and available for existing applications and maintenance but is not recommended for new circuit development. All substitute parts within the TOPSwitch®-II series carry the same status. For new designs, consult Power Integrations for current-generation alternatives outside this product family.

Q: Are there any compliance differences between TOP224YN and its substitutes?

A: No. All TOPSwitch®-II parts listed carry identical RoHS compliance, MSL rating (1 - Unlimited), REACH status (REACH Unaffected), and ECCN/HTSUS classifications. Regulatory and environmental compliance is uniform across the series.

Q: What inventory considerations apply when selecting a substitute?

A: Current inventory levels vary significantly: TOP222YN has 56,400 units available, while TOP225YN has 8,475 units. For supply chain planning, verify current stock levels with your supplier. Higher inventory availability may influence substitution decisions for long-term production requirements.