TOP224GN Equivalent & Substitute Parts

Part Overview

The TOP224GN is an offline switching converter IC from Power Integrations' TOPSwitch®-II series, designed for isolated power supply applications supporting Boost, Buck, Flyback, and Forward topologies. This component integrates an internal power switch with comprehensive fault protection including current limiting and over-temperature monitoring.

The TOP224GN is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across critical parameters including breakdown voltage, switching frequency, power rating, and thermal operating range to ensure direct replacement capability.

Substiute Parts

TOP224GN

Power IntegrationsIn Stock: 3897TOP224GN Datasheet

Current PartRFQ

TOP224GN-TL

Power IntegrationsIn Stock: 16688TOP224GN-TL Datasheet

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TOP244GN-TL

Power IntegrationsIn Stock: 25093TOP244GN-TL Datasheet

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FSQ0370RLA

Fairchild SemiconductorIn Stock: 1650FSQ0370RLA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP224GN are classified based on strict electrical and mechanical parameter alignment. The substitution logic follows these criteria:

Primary Substitution Criteria:

• Voltage - Breakdown: 700V (mandatory match)
• Output Isolation: Isolated (mandatory match)
• Internal Switch(s): Yes (mandatory match)
• Operating Temperature Range: -40°C ~ 150°C minimum (mandatory match)
• Package / Case: 8-SMD, Gull Wing (mandatory match)
• Mounting Type: Surface Mount (mandatory match)
• RoHS Compliance: Required

Secondary Compatibility Parameters:

• Frequency - Switching: 100kHz (preferred match; ±32kHz variance acceptable for Flyback topology)
• Power Rating: 27W ~ 30W (acceptable range)
• Duty Cycle: 60% ~ 67% (acceptable range)
• Fault Protection: Current Limiting and Over Temperature minimum

Grouping Classification:

Group 1 - Direct Equivalent (Same Series, Identical Packaging): TOP224GN-TL meets all primary criteria with identical electrical specifications and packaging format (Tape & Reel variant of same base product).

Group 2 - Cross-Series Equivalent (Different Series, Compatible Topology): TOP244GN-TL (TOPSwitch®-GX series) meets primary electrical criteria with Flyback topology specialization and variable frequency range (66kHz ~ 132kHz).

Group 3 - Cross-Manufacturer Equivalent (Alternative Manufacturer): FSQ0370RLA (Fairchild FPS™ series) meets primary electrical criteria with Flyback topology and active product status.

Parameter Comparison

Engineering Selection Recommendations

TOP224GN-TL Selection Criteria: TOP224GN-TL is the primary substitute for TOP224GN applications. Both components share identical electrical specifications (700V breakdown, 100kHz switching, 30W power rating, 67% duty cycle) and thermal operating range (-40°C ~ 150°C). The difference is packaging format: TOP224GN-TL is supplied in Tape & Reel configuration versus bulk packaging for TOP224GN. Both maintain RoHS compliance and MSL-4 moisture sensitivity rating. This substitute is suitable for direct replacement in existing designs where Boost, Buck, Flyback, or Forward topologies are implemented. Product status is "Not For New Designs," indicating limited future availability.

TOP244GN-TL Selection Criteria: TOP244GN-TL is a cross-series substitute applicable when Flyback topology is the primary circuit requirement. This TOPSwitch®-GX component maintains 700V breakdown voltage and -40°C ~ 150°C operating temperature range. Switching frequency operates across 66kHz ~ 132kHz range (encompassing the 100kHz nominal of TOP224GN). Power rating is 28W (within acceptable 27W ~ 30W range). Enhanced fault protection includes Over Voltage monitoring. Duty cycle is 66.5% (within acceptable 60% ~ 67% range). Package format is 8-SMD (7 Leads) Gull Wing, maintaining surface mount compatibility. This substitute is suitable for Flyback-only applications where the broader frequency range and enhanced protection features are compatible with circuit design.

FSQ0370RLA Selection Criteria: FSQ0370RLA is a cross-manufacturer substitute from Fairchild Semiconductor's FPS™ series, applicable for Flyback topology applications. This component maintains 700V breakdown voltage and 100kHz switching frequency. Power rating is 27W (within acceptable range). Enhanced fault protection includes Over Load and Over Voltage monitoring. Operating temperature range is -40°C ~ 85°C (TA), which is narrower than TOP224GN's -40°C ~ 150°C (TJ) specification. Product status is Active, indicating ongoing availability and support. Supplier device package is 8-LSOP (versus 8-SMD), requiring PCB layout verification for pin compatibility. This substitute is suitable for Flyback applications where active product status and cross-manufacturer sourcing are prioritized, with thermal environment verification required.

Frequently Asked Questions (FAQ)

Q1: Can TOP224GN-TL directly replace TOP224GN in existing designs?

A: Yes. TOP224GN-TL is a direct electrical equivalent with identical breakdown voltage (700V), switching frequency (100kHz), power rating (30W), duty cycle (67%), and operating temperature range (-40°C ~ 150°C). The only difference is packaging format (Tape & Reel versus bulk). PCB layout and schematic remain unchanged. Both components are RoHS compliant with MSL-4 rating.

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

A: TOP224GN-TL (TOPSwitch®-II) supports multiple topologies (Boost, Buck, Flyback, Forward) with fixed 100kHz switching frequency. TOP244GN-TL (TOPSwitch®-GX) is optimized for Flyback topology only with variable switching frequency (66kHz ~ 132kHz) and enhanced Over Voltage protection. Select TOP244GN-TL only if Flyback topology is required and variable frequency operation is compatible with circuit design.

Q3: Is FSQ0370RLA suitable for applications requiring -40°C ~ 150°C operating temperature?

A: No. FSQ0370RLA specifies operating temperature of -40°C ~ 85°C (TA), which does not meet the -40°C ~ 150°C (TJ) requirement of TOP224GN. This substitute is suitable only for applications with maximum ambient temperature of 85°C. Verify thermal environment before selection.

Q4: Are there packaging compatibility concerns when substituting TOP224GN with alternatives?

A: TOP224GN-TL uses identical 8-SMD Gull Wing package, requiring no PCB layout changes. TOP244GN-TL uses 8-SMD (7 Leads) Gull Wing package; verify pinout compatibility with schematic. FSQ0370RLA uses 8-LSOP package; PCB footprint and pin assignment must be verified against original design before implementation.

Q5: Which substitute is recommended for new design implementations?

A: FSQ0370RLA is the only substitute with Active product status, indicating ongoing manufacturer support and availability. However, thermal operating range (-40°C ~ 85°C) must be verified against application requirements. For applications requiring -40°C ~ 150°C operation, TOP224GN-TL is the only viable substitute, though it carries "Not For New Designs" status.

Q6: What fault protection features differ among the three substitutes?

A: TOP224GN and TOP224GN-TL provide Current Limiting and Over Temperature protection. TOP244GN-TL adds Over Voltage protection. FSQ0370RLA provides Current Limiting, Over Load, Over Temperature, and Over Voltage protection. Enhanced protection in TOP244GN-TL and FSQ0370RLA may improve circuit reliability but requires verification that protection thresholds are compatible with existing design parameters.

Q7: Can TOP224GN be used in Flyback-only applications where TOP244GN-TL is available?

A: Yes. TOP224GN supports Flyback topology among other topologies. However, TOP244GN-TL is specifically optimized for Flyback with variable frequency control (66kHz ~ 132kHz) and enhanced Over Voltage protection. For Flyback-only designs, TOP244GN-TL may provide superior performance characteristics, but TOP224GN-TL remains functionally compatible.

Q8: What is the significance of "Not For New Designs" status?

A: "Not For New Designs" indicates the manufacturer has discontinued active development and recommends against use in new product implementations. These parts remain available from existing inventory but future availability is not guaranteed. For new designs, FSQ0370RLA (Active status) is preferred. For legacy product maintenance, TOP224GN-TL or TOP244GN-TL are acceptable substitutes.