TOP246GN-TL Equivalent & Substitute Parts

Part Overview

The TOP246GN-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This device integrates a high-voltage power switch with control circuitry for isolated flyback topology power supplies operating at 66kHz to 132kHz switching frequency with 34W output power capability.

The TOP246GN-TL carries a "Not For New Designs" product status. This designation indicates the part remains available for existing applications and maintenance but is no longer recommended for new circuit development. Identifying equivalent substitute parts from the same TOPSwitch®-GX family ensures design flexibility, supply chain continuity, and access to functionally compatible alternatives with varying power ratings.

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)	34W
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
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	4 (72 Hours)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution within the TOPSwitch®-GX family is determined by strict alignment of 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
RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 4 (72 Hours)

Variable Parameter (Determines Power Rating):

Power (Watts): Ranges from 15W to 34W across the substitute family

All substitute parts TOP242GN-TL, TOP243GN-TL, TOP244GN-TL, and TOP245GN-TL share identical electrical characteristics, protection features, switching behavior, and package specifications. The primary distinction is output power capability, which scales from 15W (TOP242GN-TL) to 34W (TOP246GN-TL). Selection of a substitute part depends on whether the application power requirement can be met by the lower-rated alternative.

Parameter Comparison

Part Number	Manufacturer	Series	Topology	Voltage - Breakdown	Frequency - Switching	Duty Cycle	Power (Watts)	Fault Protection	Operating Temperature	Package / Case	RoHS Status
TOP246GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	66.5%	34W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	RoHS Compliant
TOP245GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	66.5%	30W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	RoHS Compliant
TOP244GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	66.5%	28W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	RoHS Compliant
TOP243GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	66.5%	25W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	RoHS Compliant
TOP242GN-TL	Power Integrations	TOPSwitch®-GX	Flyback	700V	66kHz ~ 132kHz	66.5%	15W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	8-SMD (7 Leads), Gull Wing	RoHS Compliant

Engineering Selection Recommendations

All substitute parts within the TOPSwitch®-GX family maintain identical compliance certifications, regulatory status, and environmental classifications. Each part carries RoHS Compliant status, REACH Unaffected designation, and Moisture Sensitivity Level 4 (72 Hours) rating.

Selection Criteria Based on Product Status:

All parts in this family, including the main part TOP246GN-TL and all substitutes (TOP245GN-TL, TOP244GN-TL, TOP243GN-TL, TOP242GN-TL), carry "Not For New Designs" status. This status applies uniformly across the entire substitute group. For applications requiring new design qualification, evaluation of current-generation alternatives outside this family may be necessary.

Power Rating Alignment:

Selection of a substitute part must ensure the chosen device power rating meets or exceeds the application requirement. The TOP246GN-TL at 34W represents the highest power capability within this substitute group. Lower-rated alternatives (TOP245GN-TL at 30W, TOP244GN-TL at 28W, TOP243GN-TL at 25W, TOP242GN-TL at 15W) are suitable only for applications with proportionally reduced power demands.

Package and Mounting Compatibility:

All substitute parts utilize identical 8-SMD (7 Leads) Gull Wing package in SMD-8B supplier configuration with surface mount mounting type. PCB layout and assembly processes require no modification when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can TOP242GN-TL replace TOP246GN-TL in a 34W power supply design?

A: No. The TOP242GN-TL is rated for 15W maximum output power, while the TOP246GN-TL is rated for 34W. Using TOP242GN-TL in a 34W application would exceed the device power rating and result in thermal stress and potential failure. Substitution is only valid when the application power requirement does not exceed the substitute part's rated power.

Q: Are all TOPSwitch®-GX substitute parts pin-compatible?

A: Yes. All substitute parts (TOP242GN-TL, TOP243GN-TL, TOP244GN-TL, TOP245GN-TL, TOP246GN-TL) share identical 8-SMD (7 Leads) Gull Wing package configuration. No PCB redesign or pin reassignment is required when substituting between these parts.

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

A: This status indicates the part family remains available for existing production and maintenance applications but is not recommended for new circuit development. All parts in this substitute group carry this designation uniformly. New designs should evaluate current-generation alternatives from Power Integrations.

Q: Do all substitute parts meet the same environmental and compliance standards?

A: Yes. All substitute parts are RoHS Compliant, REACH Unaffected, and carry identical Moisture Sensitivity Level 4 (72 Hours) rating. Compliance certifications and environmental classifications are uniform across the entire substitute family.

Q: Can I use TOP245GN-TL (30W) in place of TOP246GN-TL (34W)?

A: TOP245GN-TL can be used only if the actual application power requirement does not exceed 30W. If the design requires the full 34W capability of TOP246GN-TL, TOP245GN-TL is not suitable. Verify actual power consumption before substitution.

Q: What packaging options are available for these substitute parts?

A: TOP246GN-TL and TOP243GN-TL are available in Cut Tape (CT) and Digi-Reel® packaging. TOP242GN-TL is available in Cut Tape (CT) only. TOP244GN-TL and TOP245GN-TL are available in Tape & Reel (TR) packaging. Packaging selection depends on procurement and assembly requirements.

Q: Are the switching frequency and duty cycle identical across all substitute parts?

A: Yes. All substitute parts operate at 66kHz to 132kHz switching frequency with 66.5% duty cycle. These parameters are fixed across the entire TOPSwitch®-GX family and do not vary by power rating.

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