TOP243GN Equivalent & Substitute Parts

Part Overview

The TOP243GN is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This device functions as an integrated power management solution for isolated flyback topology applications, operating at switching frequencies between 66 kHz and 132 kHz with a maximum power output of 25 W. The TOP243GN is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement.

Substiute Parts

TOP243GN

Power IntegrationsIn Stock: 1555TOP243GN Datasheet

Current PartRFQ

TOP243GN-TL

Power IntegrationsIn Stock: 18359TOP243GN-TL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP243GN is determined by strict alignment with the following critical parameters:

Primary Substitution Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 700V rating
• Frequency - Switching: 66 kHz ~ 132 kHz operating range
• Power (Watts): 25 W output capacity
• Duty Cycle: 66.5%
• Internal Switch(s): Integrated switching element
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control capability
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Package / Case: 8-SMD (7 Leads), Gull Wing
• Mounting Type: Surface Mount

The TOP243GN-TL is identified as a direct substitute, sharing identical electrical specifications and mechanical packaging. This substitute differs only in packaging format (Cut Tape & Digi-Reel®) and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

TOP243GN-TL Selection Basis:

The TOP243GN-TL serves as the direct functional equivalent to the TOP243GN. Both devices are manufactured by Power Integrations within the TOPSwitch®-GX series and maintain identical electrical and mechanical specifications across all critical parameters: 700V breakdown voltage, 66 kHz to 132 kHz switching frequency range, 25 W power output, 66.5% duty cycle, and 8-SMD (7 Leads) Gull Wing package configuration.

The primary distinction between these parts is packaging format and product lifecycle status. The TOP243GN-TL is supplied in Cut Tape and Digi-Reel® formats, whereas the TOP243GN was supplied in standard packaging. The TOP243GN-TL carries a "Not For New Designs" status, indicating limited future availability, while the TOP243GN is marked as discontinued.

Both devices maintain full RoHS compliance and REACH unaffected status, satisfying regulatory requirements for current applications. Moisture sensitivity level (MSL 4, 72 Hours) and operating temperature range (-40°C to 150°C junction temperature) are identical across both variants.

Frequently Asked Questions (FAQ)

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

A: Yes. The TOP243GN-TL is electrically and mechanically identical to the TOP243GN. All critical parameters—breakdown voltage, switching frequency, power output, duty cycle, fault protection features, and package configuration—are equivalent. The difference is limited to packaging format (Cut Tape & Digi-Reel® versus standard packaging) and product lifecycle designation.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by matching: topology (Flyback), output isolation (Isolated), voltage breakdown (700V), switching frequency range (66 kHz ~ 132 kHz), power output (25 W), duty cycle (66.5%), internal switching capability, fault protection features (Current Limiting, Over Temperature, Over Voltage), frequency control capability, operating temperature range (-40°C ~ 150°C TJ), and package type (8-SMD 7 Leads, Gull Wing, SMD-8B).

Q: Are there compliance or regulatory differences between TOP243GN and TOP243GN-TL?

A: No. Both devices are RoHS Compliant and REACH Unaffected. Moisture sensitivity level (MSL 4, 72 Hours) is identical. Both carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What is the significance of the "Not For New Designs" status on TOP243GN-TL?

A: This designation indicates that Power Integrations does not recommend the TOP243GN-TL for new design implementations. However, it remains functionally equivalent to the TOP243GN and is suitable for replacement in existing applications or maintenance scenarios where component continuity is required.

Q: Does packaging format affect electrical performance?

A: No. The Cut Tape & Digi-Reel® packaging of TOP243GN-TL does not alter electrical characteristics or performance. Packaging format affects only handling, storage, and supply chain logistics. The SMD-8B package configuration and component pinout remain identical.