TOP242G-TL Equivalent & Substitute Parts

Part Overview

The TOP242G-TL is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications with 15 W output capacity. This component operates at 66 kHz to 132 kHz switching frequency with integrated current limiting, over-temperature, and over-voltage protection. The part is classified as Obsolete, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary for design continuity, procurement availability, and compliance with current manufacturing standards.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	TOPSwitch®-GX
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66 kHz ~ 132 kHz
Power (Watts)	15 W
Duty Cycle	66.5%
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control
Package / Case	8-SMD (7 Leads), Gull Wing
Supplier Device Package	SMD-8B
Operating Temperature	-40°C ~ 150°C (TJ)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the TOP242G-TL is based on strict electrical and mechanical parameter compatibility within the TOPSwitch®-GX family. The following criteria determine valid substitutes:

Core Compatibility Parameters:

Topology: Flyback (all substitutes maintain this topology)
Output Isolation: Isolated (all substitutes are isolated)
Voltage - Breakdown: 700V (all substitutes maintain this rating)
Frequency - Switching: 66 kHz ~ 132 kHz (all substitutes operate in this range)
Duty Cycle: 66.5% (all substitutes maintain this specification)
Fault Protection: Current Limiting, Over Temperature, Over Voltage (all substitutes include these protections)
Control Features: Frequency Control (all substitutes use frequency control)
Package / Case: 8-SMD (7 Leads), Gull Wing (all substitutes use identical packaging)
Supplier Device Package: SMD-8B (all substitutes use this package designation)
Operating Temperature: -40°C ~ 150°C (TJ) (all substitutes maintain this range)
Mounting Type: Surface Mount (all substitutes are surface mount)

Variable Parameter (Power Rating): The power rating differs among substitutes, ranging from 15 W to 34 W. Higher-rated devices can substitute for lower-rated applications within the same topology and electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Power (W)	Packaging	Product Status	RoHS Status	Inventory (Pcs)
TOP242G-TL	Power Integrations	15	Gull Wing SMD-8B	Obsolete	Non-compliant	1036
TOP242GN-TL	Power Integrations	15	Gull Wing SMD-8B	Not For New Designs	Compliant	23300
TOP243GN-TL	Power Integrations	25	Gull Wing SMD-8B	Not For New Designs	Compliant	18276
TOP244GN-TL	Power Integrations	28	Gull Wing SMD-8B	Not For New Designs	Compliant	25072
TOP245GN-TL	Power Integrations	30	Gull Wing SMD-8B	Not For New Designs	Compliant	6200
TOP246GN-TL	Power Integrations	34	Gull Wing SMD-8B	Not For New Designs	Compliant	3700

Engineering Selection Recommendations

Direct Electrical Equivalent: TOP242GN-TL is the direct equivalent to TOP242G-TL, maintaining identical 15 W power rating and all electrical specifications. This part is RoHS Compliant and carries significantly higher inventory availability (23,300 pcs vs. 1,036 pcs). Selection of TOP242GN-TL is appropriate for applications requiring exact power rating matching and RoHS compliance.

Higher Power Capacity Substitutes: TOP243GN-TL, TOP244GN-TL, TOP245GN-TL, and TOP246GN-TL are parametric equivalents with increased power ratings (25 W, 28 W, 30 W, and 34 W respectively). All maintain identical electrical topology, switching frequency, breakdown voltage, and protection features. These parts are suitable for applications where the original 15 W specification can accommodate higher-rated devices without circuit redesign, provided thermal management and component stress analysis confirm compatibility.

Compliance Considerations: All substitute parts (TOP242GN-TL through TOP246GN-TL) are RoHS Compliant, addressing regulatory requirements that the original TOP242G-TL (RoHS Non-compliant) does not meet. All substitutes carry REACH Unaffected status and EAR99 classification, matching the original part's export compliance profile.

Product Status Impact: The original TOP242G-TL is Obsolete. All substitute parts carry "Not For New Designs" status, indicating they remain available for existing designs but are not recommended for new development. For new designs, consultation with Power Integrations for current-generation alternatives is necessary.

Frequently Asked Questions (FAQ)

Q: Can TOP242GN-TL directly replace TOP242G-TL in existing designs?

A: Yes. TOP242GN-TL is the direct equivalent with identical electrical specifications, power rating, and package. The primary differences are RoHS compliance status and packaging format (Cut Tape vs. original packaging). Electrical performance and circuit behavior are equivalent.

Q: What is the difference between TOP242G-TL and TOP242GN-TL?

A: The "G" suffix indicates the original Obsolete version; the "GN" suffix indicates the updated version with RoHS Compliance. Electrical specifications, topology, and power rating (15 W) are identical. TOP242GN-TL is available in higher quantities and meets current environmental regulations.

Q: Can I use TOP243GN-TL, TOP244GN-TL, TOP245GN-TL, or TOP246GN-TL as substitutes?

A: These parts are parametric equivalents with higher power ratings (25 W, 28 W, 30 W, 34 W). They maintain all core electrical specifications: 700V breakdown voltage, 66-132 kHz switching frequency, identical topology, and protection features. Substitution is valid if circuit design and thermal management accommodate the higher power rating. No circuit topology changes are required.

Q: What does "Not For New Designs" mean?

A: This status indicates the part is available for procurement to support existing production but is not recommended for new product development. Power Integrations continues to supply these parts for legacy design support, but newer alternatives may be available for new applications.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use 8-SMD (7 Leads) Gull Wing package with SMD-8B supplier designation. Pin configuration and PCB footprint are identical, enabling direct mechanical substitution.

Q: What is the difference between Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) packaging?

A: These are supply format variations, not electrical differences. Cut Tape and Digi-Reel® are smaller quantity formats; Tape & Reel is standard high-volume format. All formats contain identical components with the same electrical specifications and performance.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other markets. If your application requires RoHS compliance, select TOP242GN-TL or higher-rated substitutes (TOP243GN-TL through TOP246GN-TL), all of which are RoHS Compliant. The original TOP242G-TL is RoHS Non-compliant.

Q: Can I use a higher-power substitute in a lower-power application?

A: Yes, within design constraints. A 34 W rated device (TOP246GN-TL) can operate in a 15 W application. The higher rating provides design margin and thermal headroom. However, verify that circuit design, PCB layout, and thermal management are appropriate for the selected component.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message