TOP245PN Equivalent & Substitute Parts

Part Overview

The TOP245PN is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This device integrates a 700V breakdown voltage power switch with frequency control and comprehensive fault protection (current limiting, over temperature, over voltage) for isolated flyback topology applications. The TOP245PN operates at 66kHz to 132kHz switching frequency with 30W power output capability and is rated for -40°C to 150°C junction temperature operation.

The TOP245PN carries a "Not For New Designs" product status. Identifying equivalent and substitute parts is necessary for design flexibility, supply chain continuity, and applications requiring alternative performance characteristics or active product status.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Part Number	TOP245PN
Series	TOPSwitch®-GX
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz ~ 132kHz
Power (Watts)	30W
Duty Cycle	66.5%
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-DIP (0.300", 7.62mm), 7 Leads
Mounting Type	Through Hole
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control
RoHS Status	RoHS Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the TOP245PN are classified into two categories based on parametric alignment:

Parametric Equivalents (Power Integrations TOPSwitch®-GX Series): TOP242PN, TOP243PN, TOP244PN, and TOP246PN are direct parametric equivalents within the same TOPSwitch®-GX product family. These parts share identical electrical and mechanical specifications with the TOP245PN:

Voltage breakdown: 700V
Topology: Isolated flyback
Switching frequency: 66kHz ~ 132kHz
Duty cycle: 66.5%
Package: 8-DIP (0.300", 7.62mm), 7 Leads
Operating temperature: -40°C ~ 150°C (TJ)
Fault protection: Current Limiting, Over Temperature, Over Voltage
Control features: Frequency Control
RoHS compliance: RoHS Compliant
Product status: Not For New Designs

The primary differentiator among these parametric equivalents is power output rating: TOP242PN (15W), TOP243PN (25W), TOP244PN (28W), TOP245PN (30W), and TOP246PN (34W).

Similar Parts (Alternative Manufacturers): NCP1076AAP065G (onsemi) and STR-A6069H (Sanken Electric USA Inc.) are similar flyback converter ICs with comparable core functionality but differ in specific electrical parameters and product status. These parts are classified as similar rather than direct equivalents due to variations in switching frequency, duty cycle, operating temperature range, and active product status.

Parameter Comparison

Parameter	TOP245PN	TOP242PN	TOP243PN	TOP244PN	TOP246PN	NCP1076AAP065G	STR-A6069H
Manufacturer	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations	onsemi	Sanken Electric USA Inc.
Topology	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback
Output Isolation	Isolated	Isolated	Isolated	Isolated	Isolated	Isolated	Isolated
Voltage - Breakdown	700V	700V	700V	700V	700V	700V	700V
Frequency - Switching	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	65kHz	100kHz
Power (Watts)	30W	15W	25W	28W	34W	31W	30W
Duty Cycle	66.5%	66.5%	66.5%	66.5%	66.5%	68%	83%
Operating Temperature (TJ/TA)	-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 ~ 125°C (TJ)	-20°C ~ 125°C (TA)
Package / Case	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Fault Protection	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Power, Over Temperature, Over Voltage, Short Circuit	Current Limiting, Over Load, Over Temperature, Over Voltage
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Active	Active

Engineering Selection Recommendations

For Parametric Equivalents (TOP242PN, TOP243PN, TOP244PN, TOP246PN):

These parts are direct substitutes within the TOPSwitch®-GX family when power output requirements differ from the 30W specification of TOP245PN. Selection among these parametric equivalents is determined by the required power output:

TOP242PN (15W): Applications requiring lower power output
TOP243PN (25W): Applications requiring 25W output
TOP244PN (28W): Applications requiring 28W output
TOP246PN (34W): Applications requiring higher power output up to 34W

All parametric equivalents maintain identical electrical characteristics (700V breakdown, 66kHz-132kHz switching frequency, 66.5% duty cycle, -40°C to 150°C operating range) and package specifications (8-DIP through-hole). All carry "Not For New Designs" status and RoHS compliance. Substitution among these parts requires only transformer and output filter redesign to accommodate the different power ratings.

For Similar Parts (NCP1076AAP065G, STR-A6069H):

These parts are suitable for applications where active product status is required or where alternative manufacturer sourcing is necessary. However, substitution requires design verification due to parameter differences:

NCP1076AAP065G (onsemi) offers active product status and enhanced fault protection (includes short circuit protection). Operating temperature is limited to -40°C to 125°C (versus -40°C to 150°C for TOP245PN). Switching frequency is fixed at 65kHz (versus 66kHz-132kHz variable range). Duty cycle is 68% (versus 66.5%). This part is suitable for applications where fixed-frequency operation and active product support are prioritized.

STR-A6069H (Sanken Electric USA Inc.) offers active product status and comparable 30W power output. However, switching frequency is fixed at 100kHz (versus variable 66kHz-132kHz), duty cycle is 83% (versus 66.5%), and operating temperature range is -20°C to 125°C (versus -40°C to 150°C). This part is suitable for applications where higher switching frequency operation and active product support are required.

Frequently Asked Questions (FAQ)

Q: Can TOP242PN, TOP243PN, TOP244PN, or TOP246PN be used as direct drop-in replacements for TOP245PN?

A: These parts share identical electrical specifications (700V breakdown, 66kHz-132kHz switching frequency, 66.5% duty cycle, -40°C to 150°C operating temperature) and package configuration (8-DIP through-hole). However, they differ in power output rating (15W, 25W, 28W, and 34W respectively, versus 30W for TOP245PN). Direct substitution requires transformer and output filter redesign to accommodate the different power rating. PCB layout and component placement may require adjustment.

Q: What is the primary difference between TOP245PN and other TOPSwitch®-GX parametric equivalents?

A: The primary differentiator is power output rating. TOP242PN delivers 15W, TOP243PN delivers 25W, TOP244PN delivers 28W, TOP245PN delivers 30W, and TOP246PN delivers 34W. All other electrical parameters (voltage breakdown, switching frequency range, duty cycle, operating temperature, fault protection, control features) and package specifications remain identical across the series.

Q: Can NCP1076AAP065G or STR-A6069H be used as direct replacements for TOP245PN?

A: NCP1076AAP065G and STR-A6069H are similar flyback converter ICs but are not direct drop-in replacements. Both parts differ in switching frequency (65kHz fixed and 100kHz fixed respectively, versus 66kHz-132kHz variable for TOP245PN), duty cycle (68% and 83% respectively, versus 66.5%), and operating temperature range. NCP1076AAP065G is limited to -40°C to 125°C, and STR-A6069H to -20°C to 125°C. Substitution requires full circuit redesign and validation.

Q: Why is TOP245PN marked "Not For New Designs"?

A: "Not For New Designs" status indicates that Power Integrations no longer recommends this part for new product development. However, the part remains available for existing designs and legacy applications. For new designs, NCP1076AAP065G (onsemi) or STR-A6069H (Sanken Electric USA Inc.) offer active product status and ongoing manufacturer support.

Q: Are all substitute parts RoHS compliant?

A: Yes. TOP242PN, TOP243PN, TOP244PN, and TOP246PN are RoHS Compliant. NCP1076AAP065G is ROHS3 Compliant. STR-A6069H is RoHS Compliant. All parts meet RoHS requirements for new designs and applications subject to RoHS regulations.

Q: What is the package compatibility among these parts?

A: All listed parts use 8-DIP (0.300", 7.62mm) through-hole package with 7 leads. Package footprint and pin configuration are identical, allowing PCB layout reuse. However, internal pin functionality may differ between manufacturers (Power Integrations, onsemi, Sanken Electric), requiring schematic verification before substitution.

Q: Which substitute part offers the best supply availability?

A: TOP244PN has the highest inventory (6164 Pcs), followed by STR-A6069H (3205 Pcs). TOP245PN has 2053 Pcs in stock. For applications requiring immediate availability, TOP244PN is recommended if the 28W power output is acceptable for the application.

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