TOP243PN Equivalent & Substitute Parts

Part Overview

The TOP243PN 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, rated at 25 W output power with 700V breakdown voltage. The TOP243PN operates at switching frequencies between 66kHz and 132kHz with integrated frequency control and comprehensive fault protection including current limiting, over-temperature, and over-voltage protection.

The TOP243PN carries a "Not For New Designs" product status, indicating that Power Integrations no longer recommends this device for new circuit development. This status necessitates identifying equivalent substitute parts that maintain functional compatibility while offering current product support or enhanced specifications.

Substiute Parts

TOP243PN

Power IntegrationsIn Stock: 1602TOP243PN Datasheet

Current PartRFQ

TOP242PN

Power IntegrationsIn Stock: 1754TOP242PN Datasheet

Parametric EquivalentRFQ

TOP244PN

Power IntegrationsIn Stock: 6252TOP244PN Datasheet

Parametric EquivalentRFQ

TOP245PN

Power IntegrationsIn Stock: 2075TOP245PN Datasheet

Parametric EquivalentRFQ

TOP246PN

Power IntegrationsIn Stock: 1567TOP246PN Datasheet

Parametric EquivalentRFQ

STR-A6069H

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP243PN are classified into two categories based on parametric alignment:

Parametric Equivalents (Power Integrations TOPSwitch®-GX Series): The TOP242PN, TOP244PN, TOP245PN, and TOP246PN are direct parametric equivalents within the same TOPSwitch®-GX product family. These devices share identical electrical and mechanical characteristics with the TOP243PN across all critical parameters: 700V breakdown voltage, 66kHz ~ 132kHz switching frequency range, 66.5% duty cycle, identical fault protection features (current limiting, over-temperature, over-voltage), frequency control capability, 8-DIP package configuration, through-hole mounting, and operating temperature range of -40°C ~ 150°C. The primary differentiation among these parts is output power rating, which ranges from 15W (TOP242PN) to 34W (TOP246PN). The TOP243PN at 25W output power positions it between the TOP242PN (15W) and TOP244PN (28W) in the power hierarchy.

Similar Substitute (Alternative Manufacturer): The STR-A6069H manufactured by Sanken Electric USA Inc. represents a similar device from an alternative manufacturer. While this part maintains the same 700V breakdown voltage, isolated flyback topology, 8-DIP package, and through-hole mounting, it differs in several operational parameters: switching frequency is fixed at 100kHz (versus the 66kHz ~ 132kHz range of TOP243PN), duty cycle is 83% (versus 66.5%), output power is rated at 30W, and operating temperature range is -20°C ~ 125°C (versus -40°C ~ 150°C). The STR-A6069H carries "Active" product status, indicating current manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement in Existing Designs:

The TOP244PN (28W) and TOP245PN (30W) are the most suitable direct replacements for the TOP243PN (25W) within the Power Integrations TOPSwitch®-GX family. Both devices maintain complete parametric compatibility across all critical electrical and mechanical specifications: identical 700V breakdown voltage, 66kHz ~ 132kHz switching frequency range, 66.5% duty cycle, frequency control capability, comprehensive fault protection, 8-DIP through-hole package, and -40°C ~ 150°C operating temperature range. The higher power ratings of these alternatives (28W and 30W respectively) accommodate applications requiring the TOP243PN's 25W specification without circuit modification. Both TOP244PN and TOP245PN retain the "Not For New Designs" status, indicating they are legacy devices suitable for replacement applications only.

For New Design Implementations:

The STR-A6069H from Sanken Electric USA Inc. is the only substitute option with "Active" product status, making it the appropriate choice for new circuit development. This device maintains the same 700V breakdown voltage, isolated flyback topology, 8-DIP through-hole package, and RoHS compliance as the TOP243PN. However, circuit designers must account for operational differences: fixed 100kHz switching frequency (versus the TOP243PN's variable 66kHz ~ 132kHz range), 83% duty cycle (versus 66.5%), and reduced operating temperature range (-20°C ~ 125°C versus -40°C ~ 150°C). The STR-A6069H's 30W power rating exceeds the TOP243PN specification. The absence of frequency control features in the STR-A6069H requires design evaluation for applications dependent on frequency modulation.

Compliance and Regulatory Considerations:

All substitute parts listed maintain RoHS compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices. The TOP243PN, TOP242PN, TOP244PN, TOP245PN, and TOP246PN share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The STR-A6069H carries the same ECCN and HTSUS codes, confirming equivalent export control and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the TOP244PN or TOP245PN be used as direct pin-for-pin replacements for the TOP243PN?

A: Yes. The TOP244PN and TOP245PN are pin-compatible with the TOP243PN. Both devices use the identical 8-DIP (0.300", 7.62mm) package with 7 leads and through-hole mounting configuration. No PCB modifications are required for physical installation. Electrical operation is compatible across all control and protection functions.

Q: What is the primary difference between TOP242PN, TOP243PN, TOP244PN, TOP245PN, and TOP246PN?

A: The primary difference is output power rating. TOP242PN is rated at 15W, TOP243PN at 25W, TOP244PN at 28W, TOP245PN at 30W, and TOP246PN at 34W. All other electrical and mechanical parameters remain identical within the TOPSwitch®-GX series.

Q: Why is the STR-A6069H listed as a substitute if it has different switching frequency and duty cycle?

A: The STR-A6069H is classified as a "similar" substitute rather than a parametric equivalent. It maintains the same 700V breakdown voltage, isolated flyback topology, 8-DIP package, and through-hole mounting. However, the fixed 100kHz switching frequency and 83% duty cycle differ from the TOP243PN's variable frequency range and 66.5% duty cycle. This device is suitable only for applications where these operational differences are acceptable or where the higher power rating (30W) is beneficial.

Q: Should I use TOP242PN (15W) as a substitute if my application requires only 20W output?

A: No. The TOP242PN is rated at 15W output power, which is below the 20W requirement. Using an undersized power device creates thermal stress and reduces design margin. The TOP244PN (28W) or TOP245PN (30W) are appropriate choices for applications requiring 20W or higher output power.

Q: Is the STR-A6069H suitable for applications requiring the -40°C to -20°C temperature range?

A: No. The STR-A6069H operating temperature range is -20°C ~ 125°C (TA), which does not extend to -40°C. Applications requiring operation below -20°C must use TOP243PN, TOP242PN, TOP244PN, TOP245PN, or TOP246PN, all of which support -40°C ~ 150°C (TJ) junction temperature range.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates that the manufacturer (Power Integrations) no longer recommends these devices for new circuit development. These parts are suitable for replacement applications in existing designs or for maintaining legacy products. For new designs, the STR-A6069H with "Active" status is the recommended alternative.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed—TOP242PN, TOP244PN, TOP245PN, TOP246PN, and STR-A6069H—are RoHS compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, matching the TOP243PN's compliance profile.

Q: Can I use TOP246PN (34W) in place of TOP243PN (25W) without any circuit changes?

A: Yes. The TOP246PN is pin-compatible and electrically compatible with the TOP243PN. The higher power rating (34W versus 25W) provides additional design margin. No circuit modifications are required for physical or electrical substitution.