TOP244G-TL Equivalent & Substitute Parts

Part Overview

The TOP244G-TL is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications. This component integrates a high-voltage switch with comprehensive fault protection including current limiting, over-temperature, and over-voltage monitoring. The part is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts maintain the same core electrical specifications and package format while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	TOPSwitch®-GX
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz ~ 132kHz
Duty Cycle	66.5%
Power (Watts)	28 W
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SMD (7 Leads), Gull Wing
Supplier Device Package	SMD-8B
Mounting Type	Surface Mount
Internal Switch(s)	Yes

Substitute Part Grouping Explanation

Substitution eligibility for the TOP244G-TL is determined by strict adherence to the following parameters:

Critical Matching Parameters:

Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Frequency - Switching: 66kHz ~ 132kHz
Duty Cycle: 66.5%
Fault Protection: Current Limiting, Over Temperature, Over Voltage
Control Features: Frequency Control
Operating Temperature: -40°C ~ 150°C (TJ)
Package / Case: 8-SMD (7 Leads), Gull Wing
Supplier Device Package: SMD-8B
Mounting Type: Surface Mount
Series: TOPSwitch®-GX

Variable Parameter (Power Rating): The power rating in watts differs across the substitute parts. Substitution is valid when the substitute part's power rating meets or exceeds the application requirement. The TOP244G-TL operates at 28 W; therefore, substitute parts rated at 28 W or higher are functionally equivalent for this specification.

All identified substitute parts maintain identical electrical characteristics, protection features, switching topology, and package specifications. Differences in product status and compliance certifications reflect manufacturing date and regulatory updates rather than functional capability changes.

Parameter Comparison

Part Number	Manufacturer	Series	Topology	Voltage - Breakdown	Frequency - Switching	Power (Watts)	Operating Temperature	Package / Case	Product Status	RoHS Status	Packaging Type
TOP244G-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	28 W	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	Obsolete	RoHS non-compliant	Tube
TOP244GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	28 W	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	Not For New Designs	RoHS Compliant	Tape & Reel (TR)
TOP242GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	15 W	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	Not For New Designs	RoHS Compliant	Cut Tape (CT)
TOP243GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	25 W	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	Not For New Designs	RoHS Compliant	Cut Tape (CT) & Digi-Reel®
TOP245GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	30 W	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	Not For New Designs	RoHS Compliant	Tape & Reel (TR)
TOP246GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	34 W	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	Not For New Designs	RoHS Compliant	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Direct Equivalent (Identical Power Rating): TOP244GN-TL is the direct equivalent to TOP244G-TL, maintaining the 28 W power specification. This part offers improved RoHS compliance and "Not For New Designs" status, indicating more recent manufacturing. The primary difference is packaging format (Tape & Reel vs. Tube) and compliance certification.

Higher Power Rating Substitutes (Suitable for 28 W Applications): TOP245GN-TL (30 W) and TOP246GN-TL (34 W) are functionally equivalent for applications requiring 28 W or less. These parts provide additional power headroom and maintain all electrical and protection specifications. Selection between these options depends on packaging availability and supply chain requirements.

Lower Power Rating Substitute (Not Recommended for 28 W Applications): TOP242GN-TL (15 W) does not meet the power requirement of the TOP244G-TL and is not suitable as a direct substitute for 28 W applications.

Compliance Considerations: All substitute parts (TOP244GN-TL, TOP242GN-TL, TOP243GN-TL, TOP245GN-TL, TOP246GN-TL) are RoHS Compliant, addressing regulatory requirements that the original TOP244G-TL does not meet. All substitute parts carry "Not For New Designs" status, indicating they are suitable for replacement and maintenance applications but not recommended for new product development.

Frequently Asked Questions (FAQ)

Q: Can TOP244GN-TL directly replace TOP244G-TL in existing designs? A: Yes. TOP244GN-TL maintains identical electrical specifications, switching topology, fault protection features, and package format. The primary differences are RoHS compliance status and packaging type (Tape & Reel vs. Tube). PCB layout and circuit design require no modification.

Q: What is the difference between TOP244G-TL and TOP244GN-TL? A: Both parts share the same 28 W power rating, 700V breakdown voltage, 66kHz ~ 132kHz switching frequency, and 8-SMD package. TOP244GN-TL is RoHS Compliant and supplied in Tape & Reel format, while TOP244G-TL is RoHS non-compliant and supplied in Tube format. TOP244GN-TL represents a more recent manufacturing revision.

Q: Can I use TOP245GN-TL or TOP246GN-TL instead of TOP244G-TL? A: Yes, for applications designed for 28 W operation. TOP245GN-TL (30 W) and TOP246GN-TL (34 W) provide higher power ratings while maintaining all other electrical and protection specifications. The higher power rating does not create compatibility issues; the circuit will operate within the lower 28 W requirement.

Q: Why is TOP242GN-TL listed as a substitute if it has lower power rating? A: TOP242GN-TL (15 W) is not suitable as a substitute for TOP244G-TL (28 W) applications. It is listed in the cross-reference data but does not meet the power requirement. Selection of TOP242GN-TL is appropriate only for applications designed for 15 W or lower power levels.

Q: What packaging options are available for substitutes? A: TOP244GN-TL is supplied in Tape & Reel (TR) format. TOP243GN-TL and TOP246GN-TL are available in Cut Tape (CT) & Digi-Reel® format. TOP245GN-TL is supplied in Tape & Reel (TR) format. Packaging selection depends on production volume and assembly equipment compatibility.

Q: Are all substitute parts RoHS Compliant? A: Yes. All identified substitute parts (TOP244GN-TL, TOP242GN-TL, TOP243GN-TL, TOP245GN-TL, TOP246GN-TL) are RoHS Compliant. The original TOP244G-TL is RoHS non-compliant. This compliance improvement is a key advantage of substitution.

Q: What is the significance of "Not For New Designs" status? A: "Not For New Designs" indicates that these parts are suitable for replacement, maintenance, and legacy system support but are not recommended for new product development. This status reflects manufacturing lifecycle management and does not affect functional capability or reliability for existing applications.

Q: Do all substitute parts maintain the same operating temperature range? A: Yes. All substitute parts operate across the identical temperature range of -40°C ~ 150°C (TJ), matching the TOP244G-TL specification.

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