TOP244GN-TL Equivalent & Substitute Parts

Part Overview

The TOP244GN-TL is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications. This device integrates a high-voltage switch with comprehensive fault protection in an 8-SMD surface-mount package. The TOP244GN-TL is classified as "Not For New Designs," indicating that alternative models from the TOPSwitch product family should be evaluated for new development projects. Identifying equivalent and substitute parts is essential for design flexibility, supply chain continuity, and power rating optimization across different application requirements.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Part Number	TOP244GN-TL
Series	TOPSwitch®-GX
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz ~ 132kHz
Power (Watts)	28 W
Duty Cycle	66.5%
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SMD (7 Leads), Gull Wing
Supplier Device Package	SMD-8B
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	4 (72 Hours)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the TOP244GN-TL is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Topology: Flyback converter architecture
Output Isolation: Isolated configuration
Voltage - Breakdown: 700V maximum rating
Package / Case: 8-SMD (7 Leads), Gull Wing form factor
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 150°C (TJ)
Fault Protection: Current Limiting, Over Temperature, Over Voltage

Variable Parameters (Allowable Differences):

Power (Watts): Rated output power may vary based on application requirements
Frequency - Switching: Operating frequency range may differ within acceptable limits
Duty Cycle: Internal duty cycle settings may vary
Control Features: Presence or absence of frequency control
Series Designation: Different TOPSwitch series (GX, HX) with compatible electrical specifications
Packaging Format: Tape & Reel (TR) or Cut Tape (CT) / Digi-Reel® formats
Product Status: Active or Not For New Designs classification

The substitute parts listed below maintain electrical compatibility through identical breakdown voltage, isolation topology, and fault protection mechanisms. Power rating variations accommodate different application power budgets while preserving core functionality.

Parameter Comparison

Parameter	TOP244GN-TL	TOP242GN-TL	TOP243GN-TL	TOP245GN-TL	TOP246GN-TL	TOP254GN-TL
Series	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-HX
Topology	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback
Output Isolation	Isolated	Isolated	Isolated	Isolated	Isolated	Isolated
Voltage - Breakdown	700V	700V	700V	700V	700V	700V
Power (Watts)	28 W	15 W	25 W	30 W	34 W	28 W
Frequency - Switching	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz
Duty Cycle	66.5%	66.5%	66.5%	66.5%	66.5%	78%
Fault Protection	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control	Frequency Control	Frequency Control	Frequency Control	Frequency Control	—
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Package / Case	8-SMD (7 Leads), Gull Wing	8-SMD (7 Leads), Gull Wing	8-SMD (7 Leads), Gull Wing	8-SMD (7 Leads), Gull Wing	8-SMD (7 Leads), Gull Wing	8-SMD (7 Leads), Gull Wing
Supplier Device Package	SMD-8B	SMD-8B	SMD-8B	SMD-8B	SMD-8B	SMD-8C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
MSL Rating	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)
Product Status	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Active

Engineering Selection Recommendations

For Existing Designs (Maintenance & Repair): The TOP244GN-TL remains available with 25,072 pieces in stock. Direct replacement with identical part numbers is the standard approach for field service and design maintenance. All substitute parts maintain the same electrical interface and package footprint, enabling drop-in replacement at the component level.

For Power Rating Optimization:

Lower Power Applications (≤15W): TOP242GN-TL provides reduced power rating with identical electrical characteristics and control features.
Mid-Range Applications (25-30W): TOP243GN-TL (25W) and TOP245GN-TL (30W) offer power ratings bracketing the TOP244GN-TL specification.
Higher Power Applications (≥34W): TOP246GN-TL delivers maximum power output within the TOPSwitch®-GX series while maintaining all electrical and thermal specifications.

For New Development Projects: The TOP254GN-TL (TOPSwitch®-HX series) is classified as "Active" product status and represents the recommended choice for new designs. This device maintains electrical compatibility with 700V breakdown voltage, isolated topology, and comprehensive fault protection. The TOP254GN-TL operates at fixed 66kHz frequency without frequency control features, and exhibits 78% duty cycle compared to the 66.5% specification of TOPSwitch®-GX variants. The SMD-8C package variant requires verification of PCB layout compatibility.

Compliance & Regulatory Considerations: All listed substitute parts maintain RoHS compliance, REACH unaffected status, and identical MSL-4 moisture sensitivity ratings. ECCN and HTSUS classifications remain consistent across the product family, supporting supply chain and export documentation requirements.

Frequently Asked Questions (FAQ)

Q1: Can TOP242GN-TL replace TOP244GN-TL in existing designs?

A: TOP242GN-TL is electrically compatible with TOP244GN-TL for circuit topology and protection mechanisms. However, the power rating differs: TOP242GN-TL is rated at 15W versus TOP244GN-TL at 28W. Substitution is valid only if the application power budget does not exceed 15W. PCB layout and transformer design must accommodate the lower power specification.

Q2: What is the difference between TOP244GN-TL and TOP254GN-TL?

A: Both devices share identical 700V breakdown voltage, isolated flyback topology, and fault protection. Key differences are: TOP254GN-TL belongs to the TOPSwitch®-HX series (Active status) versus TOPSwitch®-GX (Not For New Designs), operates at fixed 66kHz versus variable 66-132kHz, exhibits 78% duty cycle versus 66.5%, and lacks frequency control features. The supplier device package differs (SMD-8C versus SMD-8B). Electrical substitution is valid; however, frequency control circuit modifications may be required.

Q3: Are packaging format differences (Tape & Reel vs. Cut Tape) significant for substitution?

A: Packaging format (TR, CT, Digi-Reel®) affects supply chain handling and component presentation only. The electrical device, pin configuration, and performance characteristics remain identical. Substitution between packaging formats is valid from an engineering perspective; procurement and assembly processes must accommodate the selected format.

Q4: Can TOP246GN-TL be used in applications designed for TOP244GN-TL?

A: TOP246GN-TL is rated at 34W versus TOP244GN-TL at 28W. All electrical parameters, topology, protection features, and package specifications are identical. TOP246GN-TL operates within the same frequency range (66-132kHz) and duty cycle (66.5%). Substitution is valid; the higher power rating provides design margin without requiring circuit modifications.

Q5: What does "Not For New Designs" status mean for substitution decisions?

A: "Not For New Designs" indicates the part is in mature/legacy phase but remains available for existing design support and field replacement. For new development projects, Power Integrations recommends evaluating Active-status alternatives such as TOP254GN-TL. Existing designs may continue using TOP244GN-TL; however, long-term supply planning should consider migration to Active products.

Q6: Are all substitute parts RoHS compliant?

A: All listed substitute parts (TOP242GN-TL, TOP243GN-TL, TOP245GN-TL, TOP246GN-TL, TOP254GN-TL) maintain RoHS Compliant status identical to TOP244GN-TL. REACH status is "REACH Unaffected" across the entire product family. Regulatory compliance is maintained for all substitutions.

Q7: What is the significance of SMD-8B versus SMD-8C package variants?

A: SMD-8B and SMD-8C are supplier device package designations for the 8-SMD (7 Leads), Gull Wing form factor. Both maintain identical pin configuration and footprint compatibility. The package variant designation reflects internal manufacturing or supplier specifications. Substitution between SMD-8B and SMD-8C is valid from a component interface perspective; PCB assembly documentation should be verified for any supplier-specific handling requirements.

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