TOP244PN Equivalent & Substitute Parts

Part Overview

The TOP244PN is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications. This 8-DIP package device integrates a high-voltage switch with frequency control and comprehensive fault protection including current limiting, over-temperature, and over-voltage monitoring. The part is classified as "Not For New Designs," indicating it has been superseded in the product roadmap. Finding equivalent or substitute parts is necessary for ongoing production support, maintenance applications, and designs requiring compatible alternatives with similar electrical and mechanical characteristics.

Substiute Parts

TOP244PN

Power IntegrationsIn Stock: 6252TOP244PN Datasheet

Current PartRFQ

TOP242PN

Power IntegrationsIn Stock: 1754TOP242PN Datasheet

Parametric EquivalentRFQ

TOP243PN

Power IntegrationsIn Stock: 1602TOP243PN Datasheet

Parametric EquivalentRFQ

TOP245PN

Power IntegrationsIn Stock: 2075TOP245PN Datasheet

Parametric EquivalentRFQ

TOP246PN

Power IntegrationsIn Stock: 1567TOP246PN Datasheet

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FSL137MRIN

onsemiIn Stock: 44689FSL137MRIN Datasheet

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STR-A6069H

Sanken Electric USA Inc.In Stock: 3228STR-A6069H Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP244PN are classified into two categories based on parametric alignment and product status:

Parametric Equivalents (Power Integrations TOPSwitch®-GX Series): TOP242PN, TOP243PN, TOP245PN, and TOP246PN are direct series members sharing identical electrical and mechanical specifications with the TOP244PN, with the primary differentiator being output power rating. These parts maintain the same 700V breakdown voltage, 66kHz ~ 132kHz switching frequency range, 66.5% duty cycle, 8-DIP package configuration, and comprehensive fault protection architecture. All are classified as "Not For New Designs" and carry identical compliance certifications (RoHS Compliant, REACH Unaffected, EAR99). Substitution within this group is determined by power requirement compatibility: TOP242PN (15W), TOP243PN (25W), TOP244PN (28W), TOP245PN (30W), and TOP246PN (34W).

Similar Alternatives (Cross-Manufacturer Options): FSL137MRIN (onsemi) and STR-A6069H (Sanken Electric USA Inc.) are functionally similar offline flyback converter ICs with 700V breakdown voltage and 8-DIP package compatibility. These alternatives differ in switching frequency (67kHz for FSL137MRIN, 100kHz for STR-A6069H), duty cycle specifications, operating temperature ranges, and product status (both Active). These parts are suitable when cross-manufacturer sourcing is required or when the specific frequency and thermal characteristics align with application requirements.

Parameter Comparison

Engineering Selection Recommendations

Within TOPSwitch®-GX Series (TOP242PN, TOP243PN, TOP245PN, TOP246PN):

These parts are direct parametric equivalents suitable for substitution when power output requirements differ from the 28W specification of TOP244PN. Selection should be based on the maximum output power needed: use TOP242PN for applications requiring 15W or less, TOP243PN for 25W applications, TOP245PN for 30W applications, and TOP246PN for 34W applications. All maintain identical electrical characteristics (700V breakdown, 66kHz ~ 132kHz switching frequency, 66.5% duty cycle) and mechanical compatibility (8-DIP through-hole package). All carry identical compliance certifications and "Not For New Designs" status, indicating they are suitable for production support and maintenance of existing designs.

Cross-Manufacturer Alternatives (FSL137MRIN, STR-A6069H):

FSL137MRIN (onsemi, Active status) is suitable when cross-manufacturer sourcing is required and the 67kHz switching frequency aligns with application requirements. This part offers enhanced fault protection (includes short-circuit detection) and maintains 700V breakdown voltage and 8-DIP package compatibility. Operating temperature range is limited to -40°C ~ 125°C (TJ), which may be restrictive for high-temperature applications.

STR-A6069H (Sanken Electric USA Inc., Active status) operates at 100kHz switching frequency with 83% duty cycle, differing significantly from TOP244PN characteristics. This part is suitable only when the higher switching frequency and duty cycle specifications are compatible with transformer design and application requirements. Operating temperature range is -20°C ~ 125°C (TA), narrower than TOP244PN at the low end.

Compliance Considerations:

All substitute parts maintain RoHS compliance and REACH unaffected status, ensuring regulatory compatibility with existing designs. FSL137MRIN carries ROHS3 certification, providing enhanced compliance documentation for new market requirements.

Frequently Asked Questions (FAQ)

Q: Can TOP245PN directly replace TOP244PN in an existing design?

A: TOP245PN is a parametric equivalent within the TOPSwitch®-GX series with identical electrical and mechanical specifications except for output power rating (30W vs. 28W). Direct PCB replacement is possible if the 8-DIP through-hole footprint and pin configuration are identical. However, the higher power rating may require transformer and output stage redesign to optimize efficiency and thermal performance for the specific application.

Q: What is the primary difference between TOP244PN and the onsemi FSL137MRIN?

A: Both are 700V offline flyback converter ICs in 8-DIP packages, but FSL137MRIN operates at a fixed 67kHz switching frequency compared to TOP244PN's 66kHz ~ 132kHz range. FSL137MRIN includes short-circuit fault protection and has Active product status, while TOP244PN is classified as "Not For New Designs." Operating temperature range differs: FSL137MRIN is -40°C ~ 125°C (TJ) versus TOP244PN's -40°C ~ 150°C (TJ).

Q: Are all TOPSwitch®-GX series parts (TOP242PN through TOP246PN) pin-compatible?

A: Yes, all TOPSwitch®-GX series parts share identical 8-DIP package configuration with 7 leads and are pin-compatible. Substitution between these parts requires only verification that the output power rating meets application requirements. No PCB redesign is necessary for pin compatibility.

Q: Which substitute part should be selected for high-temperature applications above 125°C?

A: TOP244PN and other TOPSwitch®-GX series parts (TOP242PN, TOP243PN, TOP245PN, TOP246PN) support operating temperatures up to 150°C (TJ), making them suitable for high-temperature applications. Cross-manufacturer alternatives FSL137MRIN and STR-A6069H are limited to 125°C maximum, making them unsuitable for applications requiring higher thermal operation.

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

A: This designation indicates that TOP244PN and other TOPSwitch®-GX series parts are mature products no longer recommended for new design starts. However, they remain fully supported for production and maintenance of existing designs. For new designs, consider Active-status alternatives such as FSL137MRIN or STR-A6069H, or consult Power Integrations for current-generation TOPSwitch product recommendations.

Q: Can STR-A6069H replace TOP244PN in applications sensitive to switching frequency?

A: STR-A6069H operates at 100kHz fixed frequency with 83% duty cycle, significantly different from TOP244PN's 66kHz ~ 132kHz variable frequency range and 66.5% duty cycle. Substitution is only suitable if transformer design and application filtering can accommodate the higher switching frequency and different duty cycle. Transformer inductance, core selection, and output filter design may require modification.

Q: Are there inventory considerations when selecting substitute parts?

A: Current inventory levels vary: TOP244PN has 6164 pcs in stock, TOP245PN has 2053 pcs, TOP243PN has 1510 pcs, TOP246PN has 1481 pcs, TOP242PN has 1668 pcs, FSL137MRIN has 44640 pcs, and STR-A6069H has 3205 pcs. FSL137MRIN offers significantly higher availability, which may be advantageous for high-volume production or long-term supply chain planning.