TOP246YN Equivalent & Substitute Parts

Part Overview

The TOP246YN is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications. This component integrates a high-voltage switch with control circuitry in a TO-220-7C package, delivering 125 W output power across a 66 kHz to 132 kHz switching frequency range. The part carries a "Not For New Designs" status, indicating that while it remains available in inventory (22,534 pcs), alternative models from the same series should be evaluated for new development projects. Identifying suitable substitutes requires matching the isolated flyback topology, voltage specifications, thermal operating range, and package configuration.

Substiute Parts

TOP246YN

Power IntegrationsIn Stock: 22608TOP246YN Datasheet

Current PartRFQ

TOP247YN

Power IntegrationsIn Stock: 34266TOP247YN Datasheet

SimilarRFQ

TOP242YN

Power IntegrationsIn Stock: 3740TOP242YN Datasheet

Parametric EquivalentRFQ

TOP243YN

Power IntegrationsIn Stock: 57383TOP243YN Datasheet

Parametric EquivalentRFQ

TOP244YN

Power IntegrationsIn Stock: 3712TOP244YN Datasheet

Parametric EquivalentRFQ

TOP245YN

Power IntegrationsIn Stock: 45423TOP245YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP246YN is determined by strict adherence to the following parameters:

Fixed Substitution Criteria:

• Topology: Isolated Flyback (required for functional equivalence)
• Voltage - Breakdown: 700 V (electrical stress rating)
• Frequency - Switching: 66 kHz ~ 132 kHz (operational frequency band)
• Duty Cycle: 66.5% (control characteristic)
• Operating Temperature: -40°C ~ 150°C (TJ) (thermal operating range)
• Package / Case: TO-220-7 Formed Leads, 6 Leads (physical and electrical interface)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage (safety features)
• Control Features: Frequency Control (regulation method)
• Series: TOPSwitch®-GX (product family)

Variable Parameter:

• Power (Watts): The output power rating is the primary differentiator among substitute parts. The TOP246YN operates at 125 W. Substitutes are available across a range of power ratings (22 W to 165 W) within the same series, allowing selection based on application requirements.

All substitute parts listed maintain identical electrical and mechanical specifications except for power output, ensuring direct compatibility in applications where power rating adjustment is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: All parts in this substitution group carry "Not For New Designs" status. This designation indicates that while these components remain in production and available in inventory, Power Integrations has classified them as legacy products. For new development projects, evaluation of current-generation alternatives outside this series should be conducted in parallel with any use of these parts.

Compliance and Certification: All substitute parts maintain identical compliance certifications:

• RoHS Compliant
• REACH Unaffected
• Moisture Sensitivity Level 1 (Unlimited)
• ECCN: EAR99
• HTSUS: 8542.39.0001

These certifications ensure that substitution does not introduce regulatory or supply chain complications.

Power Rating Selection: The primary engineering decision in selecting a substitute involves matching the required output power to the application:

• TOP242YN (22 W): Lowest power option for minimal load applications
• TOP243YN (45 W): Mid-range option for moderate power requirements
• TOP244YN (65 W): Intermediate power rating
• TOP245YN (85 W): High-capacity option below TOP246YN
• TOP246YN (125 W): Reference part
• TOP247YN (165 W): Highest power option for demanding applications

Selection should be based on the actual power delivery requirement of the end application. Oversizing introduces unnecessary cost and thermal dissipation; undersizing risks component stress and failure.

Package and Thermal Compatibility: All parts use identical TO-220-7 through-hole packaging with 6 leads. PCB layout, heatsinking requirements, and thermal management strategies remain consistent across the entire substitution group. Operating temperature range (-40°C to 150°C junction temperature) is uniform, ensuring thermal design compatibility.

Frequently Asked Questions (FAQ)

Q: Can TOP246YN be directly replaced with TOP245YN or TOP247YN?

A: Direct replacement is possible from a functional and electrical standpoint. Both parts share identical topology, voltage ratings, switching frequency, duty cycle, operating temperature range, package configuration, and protection features. The primary difference is power output: TOP245YN delivers 85 W while TOP247YN delivers 165 W, compared to TOP246YN's 125 W. Application power requirements determine suitability. No PCB modifications are required for substitution.

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

A: This status indicates that Power Integrations has designated these parts as legacy products. While they remain available in inventory and continue to function as specified, the manufacturer recommends that new development projects evaluate alternative solutions. Existing designs using these parts may continue to source them, but new applications should consider current-generation alternatives from Power Integrations' product portfolio.

Q: Are all substitute parts RoHS compliant?

A: Yes. All parts in this substitution group are RoHS Compliant with identical REACH status (REACH Unaffected) and Moisture Sensitivity Level 1 (Unlimited). Substitution does not introduce RoHS or environmental compliance concerns.

Q: How does power rating affect thermal design?

A: Power rating directly influences heat dissipation requirements. Higher-rated parts (TOP247YN at 165 W) generate more heat than lower-rated parts (TOP242YN at 22 W). Thermal management design, including heatsink selection and PCB copper area allocation, must account for the specific power rating of the selected part. All parts operate across the same temperature range (-40°C to 150°C junction temperature), but thermal design margins vary with power output.

Q: Can TOP246YN be substituted with TOP243YN in an existing design?

A: Substitution is electrically and mechanically compatible. However, TOP243YN is rated for 45 W output compared to TOP246YN's 125 W. This substitution is only appropriate if the application's actual power requirement does not exceed 45 W. Using an undersized part risks thermal stress and potential failure. Conversely, substituting TOP246YN with TOP247YN (165 W) is acceptable if the application can tolerate the higher power rating and associated cost.

Q: What are the key parameters that must remain constant for substitution?

A: The following parameters must be identical for functional substitution: Topology (Flyback, Isolated), Voltage - Breakdown (700 V), Frequency - Switching (66 kHz ~ 132 kHz), Duty Cycle (66.5%), Operating Temperature (-40°C ~ 150°C TJ), Package / Case (TO-220-7 Formed Leads, 6 Leads), Mounting Type (Through Hole), Fault Protection (Current Limiting, Over Temperature, Over Voltage), and Control Features (Frequency Control). Power output is the only parameter that varies among substitutes.

Q: Is inventory availability a factor in substitution selection?

A: Inventory levels are provided for reference but should not be the primary selection criterion. TOP243YN has the highest inventory (57,300 pcs), while TOP242YN and TOP244YN have lower levels (3,633 and 3,675 pcs respectively). Selection should prioritize application power requirements and compliance needs. Inventory status may influence lead time and cost considerations but does not affect electrical or mechanical compatibility.