TOP224GN-TL Equivalent & Substitute Parts

Part Overview

The TOP224GN-TL is an offline switch IC manufactured by Power Integrations, part of the TOPSwitch®-II series. This device functions as a converter for offline Boost, Buck, Flyback, and Forward topologies with 100kHz switching frequency and 30W power output. The part is marked as "Not For New Designs," indicating it is a legacy component. Identifying equivalent and substitute parts is necessary for applications requiring continued support, design flexibility, or inventory optimization while maintaining electrical and mechanical compatibility.

Substiute Parts

TOP224GN-TL

Power IntegrationsIn Stock: 16688TOP224GN-TL Datasheet

Current PartRFQ

TOP244GN-TL

Power IntegrationsIn Stock: 25093TOP244GN-TL Datasheet

SimilarRFQ

TOP221GN-TL

Power IntegrationsIn Stock: 10339TOP221GN-TL Datasheet

Parametric EquivalentRFQ

TOP222GN-TL

Power IntegrationsIn Stock: 8808TOP222GN-TL Datasheet

Parametric EquivalentRFQ

TOP223GN-TL

Power IntegrationsIn Stock: 4469TOP223GN-TL Datasheet

Parametric EquivalentRFQ

FSQ0370RLA

Fairchild SemiconductorIn Stock: 1650FSQ0370RLA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP224GN-TL is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - Breakdown: 700V (must match)
• Frequency - Switching: 100kHz (must match)
• Output Isolation: Isolated (must match)
• Internal Switch(s): Yes (must match)
• Fault Protection: Current Limiting, Over Temperature (minimum requirement)

Mechanical Compatibility Criteria:

• Package / Case: 8-SMD, Gull Wing (must match)
• Mounting Type: Surface Mount (must match)

Flexible Parameters (allow variation):

• Power (Watts): 9W to 30W range acceptable for different application requirements
• Topology: Boost, Buck, Flyback, Forward (Flyback-only variants acceptable for Flyback applications)
• Duty Cycle: 60% to 67% range acceptable
• Manufacturer: Power Integrations or equivalent qualified manufacturer

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents (TOPSwitch®-II Series): TOP221GN-TL, TOP222GN-TL, TOP223GN-TL. These parts share identical electrical and mechanical specifications with TOP224GN-TL except for power output rating, which varies from 9W to 25W.

Category 2 - Similar Alternatives: TOP244GN-TL (TOPSwitch®-GX series, Flyback topology only) and FSQ0370RLA (Fairchild FPS™ series, Flyback topology only). These parts meet core electrical requirements but differ in series, topology scope, and control features.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

TOP221GN-TL, TOP222GN-TL, and TOP223GN-TL are the preferred substitutes for TOP224GN-TL. All three parts belong to the TOPSwitch®-II series and share identical electrical specifications (700V breakdown, 100kHz switching, 67% duty cycle, isolated output) and mechanical specifications (8-SMD Gull Wing package, surface mount). These parts differ only in power output rating: TOP221GN-TL (9W), TOP222GN-TL (15W), TOP223GN-TL (25W), and TOP224GN-TL (30W). Selection among these should be based on the actual power requirement of the application. All four parts carry RoHS Compliance and identical MSL ratings.

For Flyback-Specific Applications:

TOP244GN-TL (TOPSwitch®-GX series) is suitable for applications using Flyback topology exclusively. This part meets the 700V breakdown and isolated output requirements, operates at 100kHz nominal frequency (with 66kHz to 132kHz range), and provides 28W power output. TOP244GN-TL includes additional Over Voltage protection and Frequency Control features not present in TOP224GN-TL. The package is 8-SMD Gull Wing, maintaining mechanical compatibility. However, TOP244GN-TL is also marked "Not For New Designs."

For Active Product Status:

FSQ0370RLA (Fairchild FPS™ series) is the only substitute with Active product status. This part meets core electrical requirements: 700V breakdown, Flyback topology, 100kHz switching frequency, 27W power output, and isolated output. FSQ0370RLA provides enhanced fault protection (Current Limiting, Over Load, Over Temperature, Over Voltage). The package is 8-SMD Gull Wing, maintaining mechanical compatibility. However, FSQ0370RLA has a reduced operating temperature range (-40°C to 85°C ambient) compared to TOP224GN-TL (-40°C to 150°C junction), and RoHS status is not specified. FSQ0370RLA is suitable only for Flyback topology applications.

Compliance Considerations:

All Power Integrations substitutes (TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, TOP244GN-TL) maintain RoHS Compliance and identical MSL ratings (4, 72 Hours) with TOP224GN-TL. FSQ0370RLA RoHS status is not provided in the specification data.

Frequently Asked Questions (FAQ)

Q1: Can TOP221GN-TL, TOP222GN-TL, or TOP223GN-TL be used as direct replacements for TOP224GN-TL?

A: TOP221GN-TL, TOP222GN-TL, and TOP223GN-TL are parametric equivalents of TOP224GN-TL within the TOPSwitch®-II series. All four parts share identical electrical specifications (700V breakdown, 100kHz switching, 67% duty cycle, isolated output, current limiting and over temperature protection) and mechanical specifications (8-SMD Gull Wing package, surface mount). The only difference is power output rating. Selection depends on application power requirements: use TOP221GN-TL for 9W applications, TOP222GN-TL for 15W, TOP223GN-TL for 25W, or TOP224GN-TL for 30W. Designs operating below 30W can use lower-rated parts; designs requiring 30W must use TOP224GN-TL or equivalent 30W-rated alternatives.

Q2: What is the difference between TOP224GN-TL and TOP244GN-TL?

A: TOP224GN-TL and TOP244GN-TL differ in series, topology scope, and control features. TOP224GN-TL (TOPSwitch®-II) supports Boost, Buck, Flyback, and Forward topologies at fixed 100kHz switching frequency. TOP244GN-TL (TOPSwitch®-GX) supports Flyback topology only with variable switching frequency (66kHz to 132kHz). TOP244GN-TL includes Frequency Control and Over Voltage protection features not present in TOP224GN-TL. Both parts meet 700V breakdown and isolated output requirements. TOP244GN-TL is suitable only for Flyback applications; TOP224GN-TL supports broader topology options.

Q3: Is FSQ0370RLA compatible with TOP224GN-TL?

A: FSQ0370RLA is compatible with TOP224GN-TL for Flyback topology applications only. Both parts meet core electrical requirements: 700V breakdown, 100kHz switching frequency, isolated output, and similar power output (27W vs. 30W). Both use 8-SMD Gull Wing packages. FSQ0370RLA provides enhanced fault protection (includes Over Load and Over Voltage protection). However, FSQ0370RLA has a reduced operating temperature range (-40°C to 85°C ambient) compared to TOP224GN-TL (-40°C to 150°C junction). FSQ0370RLA is the only substitute with Active product status. Use FSQ0370RLA only for Flyback applications operating within the -40°C to 85°C ambient temperature range.

Q4: Are all substitute parts RoHS Compliant?

A: TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, and TOP244GN-TL are all RoHS Compliant, matching TOP224GN-TL. FSQ0370RLA RoHS compliance status is not specified in the provided data. Verify FSQ0370RLA RoHS status with the manufacturer if compliance certification is required for your application.

Q5: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, and TOP244GN-TL all have MSL 4 (72 Hours), identical to TOP224GN-TL. FSQ0370RLA MSL is not specified in the provided data. Verify FSQ0370RLA MSL with the manufacturer if moisture sensitivity requirements are critical for your assembly process.

Q6: Can I use a lower power-rated part (TOP221GN-TL or TOP222GN-TL) in a design originally specified for TOP224GN-TL (30W)?

A: No. Power rating indicates the maximum power the device can safely handle. Using a lower-rated part in a 30W application will cause the device to exceed its thermal and electrical limits, resulting in failure. Use only parts rated at or above the application's power requirement. For 30W applications, TOP224GN-TL or equivalent 30W-rated alternatives (such as TOP244GN-TL at 28W for Flyback topology, or FSQ0370RLA at 27W for Flyback topology) are required.

Q7: What is the difference between TOP224GN-TL and FSQ0370RLA in terms of operating temperature?

A: TOP224GN-TL operates from -40°C to 150°C (junction temperature). FSQ0370RLA operates from -40°C to 85°C (ambient temperature). These are different measurement references: junction temperature is measured at the die, while ambient temperature is measured in the surrounding environment. FSQ0370RLA has a significantly lower maximum operating temperature. Use FSQ0370RLA only in applications where ambient temperature does not exceed 85°C.

Q8: Can TOP224GN-TL be used in Boost, Buck, Forward, and Flyback topologies?

A: Yes. TOP224GN-TL supports Boost, Buck, Flyback, and Forward topologies. TOP221GN-TL, TOP222GN-TL, and TOP223GN-TL also support all four topologies. TOP244GN-TL and FSQ0370RLA support Flyback topology only. If your application requires Boost, Buck, or Forward topology, use TOP224GN-TL or other TOPSwitch®-II series parts (TOP221GN-TL, TOP222GN-TL, TOP223GN-TL). For Flyback-only applications, all six parts are suitable.

Q9: What packaging considerations apply to these substitute parts?

A: All substitute parts use 8-SMD Gull Wing surface mount packages. TOP244GN-TL is specified as 8-SMD (7 Leads), indicating a slightly different pin configuration. Verify PCB footprint compatibility before substitution. All parts are surface mount devices suitable for automated assembly. Moisture sensitivity level (MSL 4, 72 Hours) applies to Power Integrations parts; verify FSQ0370RLA MSL before use.

Q10: Which substitute part should I choose if product status is a concern?

A: TOP224GN-TL, TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, and TOP244GN-TL are all marked "Not For New Designs," indicating legacy status. FSQ0370RLA is the only substitute with Active product status. If long-term availability and manufacturer support are required, FSQ0370RLA is the recommended choice for Flyback topology applications. However, FSQ0370RLA has reduced operating temperature range and unspecified RoHS/MSL status. Evaluate all trade-offs before selecting FSQ0370RLA for new designs.