TOP243G Equivalent & Substitute Parts

Part Overview

The TOP243G is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications with 25W output capability. This device operates in the TOPSwitch®-GX series and implements a flyback topology with integrated frequency control and comprehensive fault protection.

The TOP243G is classified as Obsolete, which necessitates identification of equivalent substitute components for ongoing production support and new design considerations. Substitute parts must maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Substiute Parts

TOP243G

Power IntegrationsIn Stock: 1096TOP243G Datasheet

Current PartRFQ

TOP243GN-TL

Power IntegrationsIn Stock: 18359TOP243GN-TL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP243G is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Criteria:

• Topology: Flyback (isolated converter architecture)
• Voltage - Breakdown: 700V (maximum voltage rating)
• Frequency - Switching: 66kHz ~ 132kHz (operating frequency range)
• Power (Watts): 25 W (output power rating)
• Duty Cycle: 66.5% (maximum duty cycle)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage (protection features)
• Control Features: Frequency Control (control mechanism)
• Operating Temperature: -40°C ~ 150°C (TJ) (thermal operating range)

Mechanical Compatibility Criteria:

• Package / Case: 8-SMD (7 Leads), Gull Wing
• Supplier Device Package: SMD-8B
• Mounting Type: Surface Mount

The TOP243GN-TL is identified as a direct substitute based on complete alignment with all electrical and mechanical parameters listed above. Both devices share the same base product number (TOP243) and implement identical functional specifications within the TOPSwitch®-GX series.

Parameter Comparison

Engineering Selection Recommendations

For Existing Production (Maintenance & Repair): The TOP243GN-TL serves as the direct electrical and mechanical equivalent to the TOP243G. Both devices are functionally identical across all specified parameters. Selection of TOP243GN-TL is appropriate for replacement in existing designs where TOP243G components have reached end-of-life or inventory depletion.

Compliance Considerations: The TOP243G is RoHS non-compliant and carries Moisture Sensitivity Level 1. The TOP243GN-TL is RoHS Compliant with Moisture Sensitivity Level 4 (72 Hours). Organizations subject to RoHS regulations or requiring compliance certification should transition to TOP243GN-TL.

Product Status Impact: The TOP243G is classified as Obsolete, indicating discontinued manufacturing and limited availability. The TOP243GN-TL is classified as Not For New Designs, indicating restricted use for new product development but continued support for existing applications. For new designs, evaluation of alternative TOPSwitch®-GX series devices may be necessary based on specific power and topology requirements.

Packaging & Handling: TOP243GN-TL is supplied in Cut Tape (CT) & Digi-Reel® packaging, compared to the TOP243G standard packaging. Moisture sensitivity requirements differ: TOP243GN-TL requires controlled storage conditions (72-hour maximum exposure at specified humidity levels) versus unlimited storage for TOP243G.

Frequently Asked Questions (FAQ)

Q: Can TOP243GN-TL be used as a direct replacement for TOP243G in existing designs?

A: Yes. The TOP243GN-TL is electrically and mechanically equivalent to the TOP243G across all specified parameters: topology, voltage rating, switching frequency, power output, duty cycle, protection features, control mechanism, operating temperature range, and package configuration. Pin-for-pin compatibility is maintained.

Q: What is the difference between TOP243G and TOP243GN-TL?

A: The primary differences are product status, RoHS compliance, and moisture sensitivity. TOP243G is Obsolete and RoHS non-compliant with unlimited storage capability. TOP243GN-TL is Not For New Designs, RoHS Compliant, and requires controlled moisture storage (72 hours maximum). Electrical and mechanical specifications are identical.

Q: Why is TOP243G classified as Obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production and support for this part number. The TOP243GN-TL represents the current equivalent offering from Power Integrations for this functional specification.

Q: Are there packaging differences between TOP243G and TOP243GN-TL?

A: Yes. TOP243GN-TL is supplied in Cut Tape (CT) & Digi-Reel® packaging. Both devices use the same SMD-8B package format with 8-SMD (7 Leads) Gull Wing configuration and surface mount mounting type.

Q: What does Moisture Sensitivity Level 4 (72 Hours) mean for TOP243GN-TL?

A: MSL 4 indicates the component can be exposed to ambient conditions of 30°C / 85% relative humidity for a maximum of 72 hours before requiring baking. After this period, the component must be baked according to IPC-A-610 standards before soldering. TOP243G with MSL 1 has unlimited shelf life under standard conditions.

Q: Can TOP243GN-TL be used in new product designs?

A: TOP243GN-TL is classified as Not For New Designs. While it functions identically to TOP243G, Power Integrations recommends evaluating alternative current-generation components for new development. Existing production support is available for TOP243GN-TL.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: Flyback topology, 700V breakdown voltage, 66kHz ~ 132kHz switching frequency, 25W power output, 66.5% duty cycle, identical fault protection (current limiting, over temperature, over voltage), frequency control feature, and -40°C ~ 150°C operating temperature range.

Q: Is TOP243GN-TL RoHS compliant?

A: Yes. TOP243GN-TL is RoHS Compliant. TOP243G is RoHS non-compliant. Organizations requiring RoHS certification should use TOP243GN-TL.