TOP243G-TL Equivalent & Substitute Parts

Part Overview

The TOP243G-TL is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications with 25 W output capacity. This component operates at switching frequencies between 66 kHz and 132 kHz with integrated current limiting, over-temperature, and over-voltage protection. The part is classified as Obsolete, indicating it is no longer in active production. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing requirements for legacy systems or new designs requiring similar functionality.

Substiute Parts

TOP243G-TL

Power IntegrationsIn Stock: 1283TOP243G-TL Datasheet

Current PartRFQ

TOP243GN-TL

Power IntegrationsIn Stock: 18359TOP243GN-TL Datasheet

DirectRFQ

TOP242GN-TL

Power IntegrationsIn Stock: 23383TOP242GN-TL Datasheet

Parametric EquivalentRFQ

TOP244GN-TL

Power IntegrationsIn Stock: 25093TOP244GN-TL Datasheet

Parametric EquivalentRFQ

TOP245GN-TL

Power IntegrationsIn Stock: 6224TOP245GN-TL Datasheet

Parametric EquivalentRFQ

TOP246GN-TL

Power IntegrationsIn Stock: 3807TOP246GN-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP243G-TL are selected based on strict electrical and mechanical compatibility criteria. All substitute candidates share the following core parameters with the main part:

Common Substitution Criteria:

• Manufacturer: Power Integrations
• Series: TOPSwitch®-GX
• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Frequency - Switching: 66 kHz ~ 132 kHz
• 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

Variable Parameter - Power Rating: Substitute parts differ in power output capacity (measured in Watts). The TOP243G-TL operates at 25 W. Equivalent parts are available in 15 W, 28 W, 30 W, and 34 W configurations, allowing selection based on specific application power requirements.

Compliance Differences: The main part (TOP243G-TL) is RoHS non-compliant and has Obsolete product status. Direct substitutes include RoHS-compliant variants with "Not For New Designs" status, providing improved environmental compliance while maintaining electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Same Power Rating): TOP243GN-TL is the direct equivalent to TOP243G-TL, maintaining the 25 W power specification while providing RoHS compliance and improved availability (18,276 units in stock versus 1,194 for the original part). This part is recommended for applications requiring identical power output specifications.

Power-Scaled Alternatives: For applications where power output flexibility exists, the following parts provide substitution within the TOPSwitch®-GX family:

• TOP242GN-TL (15 W): For lower-power applications
• TOP244GN-TL (28 W): For applications requiring slightly higher power capacity
• TOP245GN-TL (30 W): For applications requiring higher power capacity
• TOP246GN-TL (34 W): For applications requiring maximum power capacity within this series

All substitute parts maintain identical electrical topology, switching frequency range, protection features, and thermal operating range. Selection among power-rated variants depends on specific application power requirements and thermal design considerations.

Compliance Considerations: All substitute parts carry RoHS Compliant status, addressing environmental regulatory requirements. The original TOP243G-TL is RoHS non-compliant; substitution with RoHS-compliant variants aligns with current manufacturing standards and regulatory frameworks.

Frequently Asked Questions (FAQ)

Q: Can TOP243GN-TL directly replace TOP243G-TL in existing designs? A: Yes. TOP243GN-TL maintains identical electrical specifications (25 W power output, 700V breakdown voltage, 66 kHz–132 kHz switching frequency, same package configuration) and physical footprint. The primary differences are RoHS compliance status and improved inventory availability.

Q: What determines whether a substitute part is compatible? A: Compatibility is determined by matching core parameters: flyback topology, 700V breakdown voltage, 66 kHz–132 kHz switching frequency range, 66.5% duty cycle, identical fault protection features, 8-SMD (7 Leads) Gull Wing package, and -40°C to 150°C operating temperature range. Power output rating is the primary variable parameter.

Q: Can I use TOP244GN-TL (28 W) instead of TOP243G-TL (25 W)? A: TOP244GN-TL is electrically and mechanically compatible with TOP243G-TL. The 28 W rating indicates higher power capacity. Substitution is valid if the application design accommodates the higher power specification. Thermal design and transformer specifications must be verified for the specific application.

Q: What is the difference between packaging options (Cut Tape, Digi-Reel, Tape & Reel)? A: Packaging options affect supply chain handling and procurement quantities. Cut Tape (CT) and Digi-Reel® are suitable for smaller volume requirements. Tape & Reel (TR) is standard for high-volume manufacturing. All packaging options contain identical components in the same SMD-8B package configuration.

Q: Why is TOP243G-TL marked as Obsolete? A: Obsolete status indicates the part is no longer manufactured by Power Integrations. TOP243GN-TL and other TOPSwitch®-GX variants remain available as active alternatives, ensuring continued supply for equivalent functionality.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts (TOP243GN-TL, TOP242GN-TL, TOP244GN-TL, TOP245GN-TL, TOP246GN-TL) are RoHS Compliant. The original TOP243G-TL is RoHS non-compliant.

Q: What is the Moisture Sensitivity Level (MSL) difference? A: TOP243G-TL has MSL 1 (Unlimited), while all substitute parts have MSL 4 (72 Hours). MSL 4 requires storage in controlled humidity conditions and desiccant packaging for periods exceeding 72 hours. Proper handling procedures must be implemented during storage and assembly.