TOP223GN-TL Equivalent & Substitute Parts

Part Overview

The TOP223GN-TL is an offline switching converter IC manufactured by Power Integrations, part of the TOPSwitch®-II series. This device functions as a multi-topology offline switch supporting Boost, Buck, Flyback, and Forward converter topologies with 25W power handling capability. The part is classified as Not For New Designs, indicating it has been superseded in the product lifecycle. Finding equivalent and substitute parts is necessary for applications requiring continued support, design flexibility across power levels, or alternative manufacturer sourcing while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	TOP223GN-TL
Manufacturer	Power Integrations
Category	Power Management (PMIC)
Series	TOPSwitch®-II
Voltage - Breakdown	700V
Topology	Boost, Buck, Flyback, Forward
Frequency - Switching	100kHz
Power (Watts)	25W
Duty Cycle	67%
Fault Protection	Current Limiting, Over Temperature
Output Isolation	Isolated
Internal Switch(s)	Yes
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 150°C (TJ)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	4 (72 Hours)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the TOP223GN-TL are classified into two categories based on electrical and mechanical compatibility:

Category 1: Parametric Equivalents (TOPSwitch®-II Series)

These parts share identical electrical characteristics with the TOP223GN-TL except for power rating variation:

Same manufacturer (Power Integrations)
Same series (TOPSwitch®-II)
Same voltage breakdown (700V)
Same switching frequency (100kHz)
Same duty cycle (67%)
Same topology support (Boost, Buck, Flyback, Forward)
Same package (8-SMD, Gull Wing)
Same operating temperature range (-40°C ~ 150°C)
Same fault protection (Current Limiting, Over Temperature)
Power ratings: 9W (TOP221GN-TL), 15W (TOP222GN-TL), 30W (TOP224GN-TL)

Category 2: Similar Manufacturer Parts (Alternative Series)

TOP243GN-TL represents a similar device from Power Integrations with the following differences:

Different series (TOPSwitch®-GX)
Flyback topology only (not multi-topology)
Variable switching frequency (66kHz ~ 132kHz, not fixed 100kHz)
Different duty cycle (66.5%)
Enhanced fault protection (includes Over Voltage protection)
Frequency Control feature
Different packaging option (Cut Tape & Digi-Reel®)
Same 700V breakdown voltage and 25W power rating

Category 3: Alternative Manufacturer Part

FSQ0370RLA from Fairchild Semiconductor:

Different manufacturer and series (FPS™)
Flyback topology only
Fixed 100kHz switching frequency
700V breakdown voltage
27W power rating
Enhanced fault protection (includes Over Load and Over Voltage)
Different operating temperature range (-40°C ~ 85°C TA)
Active product status
Different package designation (8-LSOP)

Parameter Comparison

Parameter	TOP223GN-TL	TOP221GN-TL	TOP222GN-TL	TOP224GN-TL	TOP243GN-TL	FSQ0370RLA
Manufacturer	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Fairchild Semiconductor
Series	TOPSwitch®-II	TOPSwitch®-II	TOPSwitch®-II	TOPSwitch®-II	TOPSwitch®-GX	FPS™
Voltage - Breakdown	700V	700V	700V	700V	700V	700V
Topology	Boost, Buck, Flyback, Forward	Boost, Buck, Flyback, Forward	Boost, Buck, Flyback, Forward	Boost, Buck, Flyback, Forward	Flyback	Flyback
Frequency - Switching	100kHz	100kHz	100kHz	100kHz	66kHz ~ 132kHz	100kHz
Power (Watts)	25W	9W	15W	30W	25W	27W
Duty Cycle	67%	67%	67%	67%	66.5%	60%
Fault Protection	Current Limiting, Over Temperature	Current Limiting, Over Temperature	Current Limiting, Over Temperature	Current Limiting, Over Temperature	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Load, Over Temperature, Over Voltage
Output Isolation	Isolated	Isolated	Isolated	Isolated	Isolated	Isolated
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD (7 Leads), Gull Wing	8-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 85°C (TA)
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	Not specified
Product Status	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Active

Engineering Selection Recommendations

For Direct Replacement (Same Power Rating and Multi-Topology Support):

TOP243GN-TL serves as a similar manufacturer alternative when Flyback topology is the primary application requirement. This part maintains the 700V breakdown voltage and 25W power rating. However, the variable switching frequency (66kHz ~ 132kHz) and Flyback-only topology differ from the TOP223GN-TL multi-topology capability. The TOP243GN-TL is also classified as Not For New Designs.

For Power Level Adjustment Within TOPSwitch®-II Series:

TOP221GN-TL: 9W applications requiring identical electrical characteristics
TOP222GN-TL: 15W applications requiring identical electrical characteristics
TOP224GN-TL: 30W applications requiring identical electrical characteristics

All three maintain the same 700V breakdown, 100kHz switching frequency, 67% duty cycle, multi-topology support, and operating temperature range as the TOP223GN-TL.

For Active Product Status with Alternative Manufacturer:

FSQ0370RLA from Fairchild Semiconductor provides an active product alternative with 700V breakdown voltage and 27W power rating. This part is limited to Flyback topology and operates at a lower maximum junction temperature (-40°C ~ 85°C TA versus -40°C ~ 150°C TJ). The 60% duty cycle and enhanced fault protection (Over Load and Over Voltage) differ from the TOP223GN-TL specification.

Compliance Considerations:

All Power Integrations parts (TOP223GN-TL, TOP221GN-TL, TOP222GN-TL, TOP224GN-TL, TOP243GN-TL) are RoHS Compliant and REACH Unaffected. FSQ0370RLA RoHS status is not specified in the provided data. All parts carry ECCN EAR99 and HTSUS 8542.39.0001 classifications.

Frequently Asked Questions (FAQ)

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

A: These parts are parametric equivalents within the TOPSwitch®-II series, sharing identical electrical characteristics (700V breakdown, 100kHz switching frequency, 67% duty cycle, multi-topology support, and operating temperature range). The primary difference is power rating: TOP221GN-TL (9W), TOP222GN-TL (15W), TOP224GN-TL (30W) versus TOP223GN-TL (25W). Selection depends on the application's actual power requirement. If the design requires exactly 25W capability, TOP224GN-TL (30W) provides headroom, while TOP222GN-TL (15W) is insufficient for 25W applications.

Q: What are the key differences between TOP223GN-TL and TOP243GN-TL?

A: Both are 25W, 700V, isolated converter ICs from Power Integrations. TOP223GN-TL supports multiple topologies (Boost, Buck, Flyback, Forward) at fixed 100kHz with 67% duty cycle. TOP243GN-TL supports Flyback topology only with variable switching frequency (66kHz ~ 132kHz) and 66.5% duty cycle. TOP243GN-TL includes Over Voltage protection and Frequency Control features not present in TOP223GN-TL. Substitution is valid only for Flyback-specific applications.

Q: Is FSQ0370RLA from Fairchild Semiconductor a suitable replacement?

A: FSQ0370RLA provides an active product alternative with comparable specifications: 700V breakdown voltage, 100kHz switching frequency, Flyback topology, and 27W power rating. However, it differs in operating temperature range (-40°C ~ 85°C TA versus -40°C ~ 150°C TJ for TOP223GN-TL), duty cycle (60% versus 67%), and includes additional Over Load and Over Voltage protection. Substitution is valid for Flyback applications within the lower temperature operating range. RoHS compliance status for FSQ0370RLA is not specified.

Q: Are all substitute parts available in the same package?

A: All parts use 8-SMD, Gull Wing surface mount packages suitable for identical PCB layouts. TOP243GN-TL is available in Cut Tape & Digi-Reel® packaging in addition to standard options. FSQ0370RLA uses the 8-LSOP supplier device package designation but maintains 8-SMD, Gull Wing case format. Mounting type is Surface Mount for all parts.

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

A: This designation indicates the part has been superseded in the manufacturer's product lifecycle. TOP223GN-TL, TOP221GN-TL, TOP222GN-TL, TOP224GN-TL, and TOP243GN-TL all carry this status. FSQ0370RLA is classified as Active. For new designs, FSQ0370RLA represents the only active product option among the listed substitutes. For existing designs or continued production support, the Not For New Designs parts remain available.

Q: How do fault protection features affect substitution decisions?

A: TOP223GN-TL provides Current Limiting and Over Temperature protection. TOP243GN-TL adds Over Voltage protection. FSQ0370RLA includes Current Limiting, Over Load, Over Temperature, and Over Voltage protection. Enhanced protection in substitute parts does not prevent substitution but may require design verification to ensure the additional protection does not interfere with intended circuit operation.

Q: What are the moisture sensitivity implications?

A: TOP223GN-TL, TOP221GN-TL, TOP222GN-TL, TOP224GN-TL, and TOP243GN-TL all specify MSL 4 (72 Hours), indicating standard moisture sensitivity handling requirements for surface mount components. FSQ0370RLA moisture sensitivity level is not specified in the provided data. Standard MSL 4 handling procedures apply to all Power Integrations parts.

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