TOP233GN Equivalent & Substitute Parts Reference

Part Overview

The TOP233GN is an offline flyback converter IC from Power Integrations' TOPSwitch®-FX series, designed for isolated power supply applications with 25W output capability. This component integrates a high-voltage switch with frequency control and comprehensive fault protection in an 8-SMD package.

The TOP233GN is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. Substitute parts must maintain compatibility across electrical specifications, thermal performance, and mechanical packaging to ensure direct replacement capability in existing designs.

Substiute Parts

TOP233GN

Power IntegrationsIn Stock: 1263TOP233GN Datasheet

Current PartRFQ

TOP233GN-TL

Power IntegrationsIn Stock: 2916TOP233GN-TL Datasheet

SimilarRFQ

TOP243GN-TL

Power IntegrationsIn Stock: 18359TOP243GN-TL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP233GN is determined by the following critical parameters:

Primary Compatibility Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 700V minimum
• Power Output: 25W capability
• Frequency - Switching: 66kHz ~ 132kHz range
• Package / Case: 8-SMD (7 Leads), Gull Wing
• Supplier Device Package: SMD-8B
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control

Identified Substitutes:

Group 1 - Direct Series Equivalent:

• TOP233GN-TL: Same base product (TOP233), identical electrical specifications, differs only in packaging format (Cut Tape vs. standard packaging)

Group 2 - Cross-Series Compatible:

• TOP243GN-TL: TOPSwitch®-GX series, maintains all critical electrical parameters including 700V breakdown, 25W output, 66kHz~132kHz switching frequency, and identical package. Duty cycle differs (66.5% vs. 78%) but remains within acceptable substitution range for isolated flyback topologies.

All substitute parts maintain RoHS compliance, MSL-4 rating, and identical thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

TOP233GN-TL is the primary substitute for TOP233GN applications. Both components share identical electrical specifications and thermal characteristics. The substitution differs only in packaging format (Cut Tape vs. standard packaging). This part is classified as Obsolete, indicating limited future availability.

TOP243GN-TL serves as a secondary substitute when TOP233GN-TL is unavailable. This part belongs to the TOPSwitch®-GX series and maintains all critical electrical parameters required for isolated 25W flyback converter applications. The duty cycle specification differs (66.5% vs. 78%), but both values remain within the operational envelope for this topology class. TOP243GN-TL is marked "Not For New Designs," indicating it remains available but is not recommended for new product development.

Compliance Considerations: All three parts maintain RoHS compliance and identical MSL-4 moisture sensitivity ratings. No regulatory or environmental compliance barriers exist for substitution.

Availability Status:

• TOP233GN: 1,216 Pcs in stock (Discontinued at DiGi Electronics)
• TOP233GN-TL: 2,889 Pcs in stock (Obsolete)
• TOP243GN-TL: 18,276 Pcs in stock (Not For New Designs)

Frequently Asked Questions (FAQ)

Q: Can TOP233GN-TL directly replace TOP233GN in existing designs?

A: Yes. TOP233GN-TL is electrically and mechanically identical to TOP233GN. The only difference is packaging format (Cut Tape). Both components are pin-compatible, have identical electrical specifications, and require no circuit modifications.

Q: What is the difference between TOP233GN and TOP243GN-TL?

A: Both are isolated 25W flyback converters with 700V breakdown voltage and 66kHz~132kHz switching frequency. The primary difference is duty cycle: TOP233GN operates at 78% while TOP243GN-TL operates at 66.5%. Both duty cycles are valid for isolated flyback topologies. TOP243GN-TL belongs to the TOPSwitch®-GX series versus TOP233GN's TOPSwitch®-FX series.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 8-SMD (7 Leads), Gull Wing package with SMD-8B supplier designation. Pin-to-pin compatibility is confirmed across TOP233GN, TOP233GN-TL, and TOP243GN-TL.

Q: What is the significance of the "Product Status" field?

A: Product Status indicates manufacturer support and availability trajectory. "Discontinued at DiGi Electronics" means the original part is no longer stocked by this distributor. "Obsolete" indicates the manufacturer has ended production. "Not For New Designs" means the part remains available but manufacturers recommend against using it in new product development. For replacement applications, any of these statuses necessitates substitute identification.

Q: Do all substitute parts meet the same thermal requirements?

A: Yes. All three parts operate across the identical temperature range of -40°C to 150°C (junction temperature). Thermal performance and derating curves are equivalent across the substitutes.

Q: Is there a difference in fault protection between these parts?

A: No. All three parts include identical fault protection: Current Limiting, Over Temperature, and Over Voltage protection. Control features (Frequency Control) are also identical.

Q: Which substitute should be selected for new inventory procurement?

A: TOP243GN-TL offers the highest current inventory (18,276 Pcs) and maintains all critical electrical specifications. However, it is marked "Not For New Designs." For replacement applications in existing products, TOP233GN-TL is preferred due to identical specifications to the original part. For new designs, consult Power Integrations' current product portfolio for recommended alternatives outside the discontinued TOPSwitch®-FX and TOPSwitch®-GX series.