TOP221GN-TL Equivalent & Substitute Parts

Part Overview

The TOP221GN-TL is an offline switch IC from Power Integrations' TOPSwitch®-II series, designed for isolated power conversion applications. This device integrates a high-voltage switch with integrated protection features, supporting multiple converter topologies including Boost, Buck, Flyback, and Forward configurations at 100kHz switching frequency with 9W power output.

The TOP221GN-TL carries a "Not For New Designs" product status. This designation indicates the part is in mature production but no longer recommended for new circuit designs. Identifying equivalent and substitute parts is essential for design flexibility, supply chain continuity, and performance optimization in applications requiring higher power ratings or alternative topology support.

Substiute Parts

TOP221GN-TL

Power IntegrationsIn Stock: 10339TOP221GN-TL Datasheet

Current PartRFQ

TOP242GN-TL

Power IntegrationsIn Stock: 23383TOP242GN-TL Datasheet

SimilarRFQ

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 of the TOP221GN-TL is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Voltage - Breakdown: 700V (must match exactly)
• Output Isolation: Isolated (must match exactly)
• Internal Switch(s): Yes (must match exactly)
• Operating Temperature Range: -40°C ~ 150°C (TJ) (must match exactly)
• Package / Case: 8-SMD, Gull Wing (must match exactly)
• Mounting Type: Surface Mount (must match exactly)
• RoHS Status: RoHS Compliant (must match exactly)
• Moisture Sensitivity Level (MSL): 4 (72 Hours) (must match exactly)

Secondary Substitution Criteria (Flexible within application requirements):

• Power (Watts): May increase for higher-capacity applications
• Frequency - Switching: May vary within acceptable operating range
• Topology Support: Must support at least one topology required by the application
• Fault Protection: May include additional protection features
• Series: May differ (TOPSwitch®-II vs. TOPSwitch®-GX)

The TOP221GN-TL has four direct parametric equivalents within the TOPSwitch®-II series (TOP222GN-TL, TOP223GN-TL, TOP224GN-TL) and one cross-series alternative (TOP242GN-TL from TOPSwitch®-GX series).

Parameter Comparison

Engineering Selection Recommendations

TOPSwitch®-II Series Substitutes (TOP222GN-TL, TOP223GN-TL, TOP224GN-TL):

These three parts maintain identical electrical and mechanical specifications to the TOP221GN-TL with the exception of power rating. Selection among these parts is determined by application power requirements:

• TOP222GN-TL: 15W output capacity. Use when application requires power output between 9W and 15W.
• TOP223GN-TL: 25W output capacity. Use when application requires power output between 15W and 25W.
• TOP224GN-TL: 30W output capacity. Use when application requires power output between 25W and 30W.

All three maintain 100kHz switching frequency, 67% duty cycle, and support identical topologies (Boost, Buck, Flyback, Forward). Packaging, thermal specifications, and compliance certifications are identical. These parts are direct pin-compatible substitutes within the same series.

TOPSwitch®-GX Series Substitute (TOP242GN-TL):

The TOP242GN-TL represents a cross-series alternative with the following distinctions:

• Belongs to TOPSwitch®-GX series rather than TOPSwitch®-II
• Supports Flyback topology only (not Boost, Buck, or Forward)
• Switching frequency range: 66kHz ~ 132kHz (variable, versus fixed 100kHz)
• Includes Over Voltage protection in addition to Current Limiting and Over Temperature
• Includes Frequency Control feature
• Packaging format: Cut Tape (CT) versus Tape & Reel (TR)
• Supplier device package: SMD-8B versus 8-SMD

The TOP242GN-TL is suitable only for Flyback topology applications. Pin configuration differs from TOP221GN-TL (7 leads versus 8 leads in the 8-SMD package). This part requires circuit redesign and is not a direct drop-in replacement.

Compliance and Regulatory Considerations:

All substitute parts maintain identical RoHS Compliance, REACH Unaffected status, and Moisture Sensitivity Level (MSL) 4 specifications. All parts carry "Not For New Designs" product status, indicating mature production phase. Selection should prioritize parts with highest current inventory availability for supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can TOP222GN-TL, TOP223GN-TL, or TOP224GN-TL be used as direct replacements for TOP221GN-TL?

A: Yes, within the TOPSwitch®-II series. These parts are pin-compatible and electrically equivalent except for power rating. They maintain identical switching frequency (100kHz), duty cycle (67%), topology support (Boost, Buck, Flyback, Forward), and package specifications (8-SMD, Gull Wing). Selection depends on application power requirements. No circuit redesign is required.

Q: What is the key difference between TOP221GN-TL and TOP242GN-TL?

A: The TOP242GN-TL belongs to the TOPSwitch®-GX series and differs in multiple parameters. It supports Flyback topology only (not Boost, Buck, or Forward), features variable switching frequency (66kHz ~ 132kHz), includes Over Voltage protection, and has a different pin configuration (7 leads versus 8 leads). This part requires circuit redesign and is not a direct drop-in replacement.

Q: Are all substitute parts available in the same packaging format?

A: No. TOP221GN-TL, TOP222GN-TL, TOP223GN-TL, and TOP224GN-TL are supplied in Tape & Reel (TR) format. TOP242GN-TL is supplied in Cut Tape (CT) format. Both formats are surface-mount compatible, but procurement and handling procedures may differ.

Q: What determines whether a substitute part is compatible with my application?

A: Compatibility is determined by: (1) Topology requirement—the substitute must support the topology used in your circuit (Boost, Buck, Flyback, or Forward); (2) Power rating—the substitute must support or exceed your application's power output requirement; (3) Switching frequency—the substitute's frequency must be compatible with your transformer and filter design; (4) Package and pin configuration—the substitute must match or be compatible with your PCB layout.

Q: Can I use TOP242GN-TL in a circuit designed for TOP221GN-TL?

A: Only if your circuit uses Flyback topology exclusively. The TOP242GN-TL does not support Boost, Buck, or Forward topologies. Additionally, the pin configuration differs (7 leads versus 8 leads), requiring PCB redesign. Frequency control features and Over Voltage protection are additional capabilities that may require circuit modifications.

Q: What is the significance of "Not For New Designs" product status?

A: This status indicates the part is in mature production and no longer recommended for new circuit designs. However, the part remains available for existing applications and production continuity. For new designs, Power Integrations recommends evaluating newer series alternatives. For existing designs, these parts remain fully functional and supported.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (TOP222GN-TL, TOP223GN-TL, TOP224GN-TL, TOP242GN-TL) maintain RoHS Compliance status identical to TOP221GN-TL. All parts are REACH Unaffected and carry identical Moisture Sensitivity Level (MSL) 4 specifications.

Q: Which substitute part has the highest current inventory?

A: TOP242GN-TL has the highest inventory at 23,300 pieces. Among TOPSwitch®-II series substitutes, TOP224GN-TL has 16,600 pieces, TOP221GN-TL has 10,300 pieces, TOP222GN-TL has 8,721 pieces, and TOP223GN-TL has 4,400 pieces.