TOP221G-TL Equivalent & Substitute Parts Reference

Part Overview

The TOP221G-TL is an offline switch IC from Power Integrations' TOPSwitch®-II series, designed for isolated power conversion applications supporting Boost, Buck, Flyback, and Forward topologies. This component operates at 100kHz switching frequency with 9W power capability and integrated current limiting and over-temperature fault protection.

The TOP221G-TL is classified as Obsolete. Locating equivalent substitute parts is necessary for design continuity, inventory replenishment, and new production builds where the original part is no longer available through standard distribution channels.

Substiute Parts

TOP221G-TL

Power IntegrationsIn Stock: 847TOP221G-TL Datasheet

Current PartRFQ

TOP221GN-TL

Power IntegrationsIn Stock: 10339TOP221GN-TL Datasheet

Parametric EquivalentRFQ

TOP222GN-TL

Power IntegrationsIn Stock: 8808TOP222GN-TL Datasheet

Parametric EquivalentRFQ

TOP223GN-TL

Power IntegrationsIn Stock: 4469TOP223GN-TL Datasheet

Parametric EquivalentRFQ

TOP224GN-TL

Power IntegrationsIn Stock: 16688TOP224GN-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP221G-TL is determined by the following critical parameters:

Core Compatibility Parameters:

• Voltage - Breakdown: 700V (all substitutes match)
• Topology: Boost, Buck, Flyback, Forward (all substitutes match)
• Frequency - Switching: 100kHz (all substitutes match)
• Output Isolation: Isolated (all substitutes match)
• Internal Switch(s): Yes (all substitutes match)
• Fault Protection: Current Limiting, Over Temperature (all substitutes match)
• Operating Temperature: -40°C ~ 150°C (TJ) (all substitutes match)
• Package / Case: 8-SMD, Gull Wing (all substitutes match)
• Mounting Type: Surface Mount (all substitutes match)

Variable Parameter:

• Power (Watts): The TOP221G-TL operates at 9W. Substitute parts are available in higher power ratings (15W, 25W, 30W), which are electrically compatible but provide increased power handling capability.

All identified substitutes belong to the TOPSwitch®-II series and maintain identical electrical and mechanical specifications except for power rating, making them functionally interchangeable in applications where the higher power capacity does not create design conflicts.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TOP221GN-TL

The TOP221GN-TL is the direct electrical equivalent to the TOP221G-TL, maintaining identical power rating (9W) and all core electrical specifications. The primary distinction is RoHS compliance status: TOP221GN-TL is RoHS Compliant, whereas the original TOP221G-TL is RoHS non-compliant. For applications subject to RoHS regulations or requiring compliance documentation, TOP221GN-TL is the preferred selection. Packaging differs (Tape & Reel vs. Bulk), which may affect procurement and handling procedures.

Secondary Substitutes: TOP222GN-TL, TOP223GN-TL, TOP224GN-TL

These parts provide higher power ratings (15W, 25W, and 30W respectively) while maintaining all other electrical and mechanical parameters. These substitutes are suitable for applications where:

• The original 9W power rating is insufficient for current or future design requirements
• Design margins require higher power headroom
• Thermal or efficiency improvements are desired through higher-rated components

All secondary substitutes are RoHS Compliant and available in Tape & Reel packaging.

Compliance Considerations:

The TOP221G-TL is RoHS non-compliant. All substitute parts (TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, TOP224GN-TL) are RoHS Compliant, making them suitable for applications requiring regulatory compliance. All parts maintain identical REACH Unaffected status and ECCN/HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can TOP222GN-TL, TOP223GN-TL, or TOP224GN-TL be used as direct replacements for TOP221G-TL?

A: Yes. All substitute parts maintain identical electrical specifications (700V breakdown voltage, 100kHz switching frequency, Boost/Buck/Flyback/Forward topology support, isolated output, and fault protection features). The higher power ratings (15W, 25W, 30W) are electrically compatible with applications designed for 9W operation. Physical package dimensions and pinout are identical (8-SMD, Gull Wing).

Q: What is the difference between TOP221G-TL and TOP221GN-TL?

A: The TOP221GN-TL is the RoHS Compliant version of the TOP221G-TL. Electrical specifications and power rating (9W) are identical. Packaging format differs: TOP221G-TL is supplied in bulk, while TOP221GN-TL is supplied in Tape & Reel format. TOP221GN-TL is recommended for new designs and applications requiring RoHS compliance documentation.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the 8-SMD, Gull Wing package with Surface Mount mounting type. However, packaging format differs: TOP221G-TL is supplied in bulk, while all substitute parts (TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, TOP224GN-TL) are supplied in Tape & Reel format. This affects procurement, storage, and automated assembly compatibility.

Q: Can I use a higher-power substitute in a design that only requires 9W?

A: Yes. Higher-power substitutes (TOP222GN-TL at 15W, TOP223GN-TL at 25W, TOP224GN-TL at 30W) are electrically compatible with applications designed for 9W operation. The higher power rating provides additional thermal margin and design flexibility. No circuit modifications are required.

Q: What is the product status of the substitute parts?

A: TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, and TOP224GN-TL are all classified as "Not For New Designs." This indicates these parts are in mature lifecycle status. For new product development, consult Power Integrations for current-generation alternatives within the TOPSwitch family.

Q: Are there any differences in operating temperature range?

A: No. All parts, including the original TOP221G-TL and all substitutes, operate across the identical temperature range of -40°C to 150°C (junction temperature).

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All parts carry MSL 4 rating with a 72-hour floor life. This requires controlled storage and handling procedures to prevent moisture absorption prior to soldering.